Electrochemical pulse volt-ampere detection system and method

Abstract

The invention discloses an electrochemical pulse volt-ampere detection system and method. The system comprises a data acquisition card, an upper computer and a hardware circuit, the upper computer is used for sending a waveform sequence to the data acquisition card, and the data acquisition card is used for receiving the waveform sequence and outputting an analog voltage waveform through the three-electrode module based on the high-precision DAC; the hardware circuit is used for acquiring data through three electrodes and transmitting the acquired data to the data acquisition card through an amplifying circuit, and the data acquisition card is used for receiving the acquired data and transmitting the acquired data to the upper computer based on a high-precision ADC (Analog to Digital Converter); the upper computer is used for processing the acquired data and displaying the acquired data; the upper computer is used for integrating four electrochemical tests through a parallel structure. The embodiment of the invention is beneficial to reducing the system volume and improving the detection efficiency. The method can be widely applied to the technical field of electrochemical testing.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical testing, in particular to an electrochemical pulse voltammetric detection system and method. Background Art

[0002] The electrochemical workstation is a tool that organically combines a potentiostat, a signal generator, and control software, and is widely used in material preparation and characterization. Through software control, it can perform a variety of electrochemical test methods such as differential pulse voltammetry, linear sweep voltammetry, conventional pulse voltammetry, and square wave voltammetry. In research, the electrochemical workstation can be used to measure the steady-state current of ultramicroelectrodes, and is used in basic teaching of electroanalysis, battery material research, biochemistry (sensors), organic electrosynthesis, metallurgy, pharmaceuticals, environmental analysis, and other fields. In electrochemical testing, a three-electrode system is common, including a working electrode, a counter electrode, and a reference electrode. In related technologies, voltammetric detection is performed using an electrochemical workstation. However, the electrochemical workstation is large in size and expensive. At the same time, multiple voltammetric detection processes need to be performed separately, which is inefficient. Summary of the invention

[0003] The purpose of the present invention is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] Therefore, the object of the present invention is to provide an efficient electrochemical pulse voltammetric detection system and method.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the embodiments of the present invention include:

[0006] In one aspect, an embodiment of the present invention provides an electrochemical pulse voltammetric detection system, comprising:

[0007] The electrochemical pulse voltammetry detection system of the embodiment of the present invention comprises: a data acquisition card, a host computer and a hardware circuit; the hardware circuit comprises a three-electrode module, the three-electrode module collects and outputs signals through a working electrode, a counter electrode and a reference electrode; the host computer is used to send a waveform sequence to the data acquisition card, the data acquisition card is used to receive the waveform sequence, and based on a high-precision DAC, outputs an analog voltage waveform through the three-electrode module; the hardware circuit is used to collect data through three electrodes, and transmit the collected data to the data acquisition card through an amplification circuit, the data acquisition card is used to receive the collected data, and transmit the collected data to the host computer based on a high-precision ADC; the host computer is used to process the collected data and display the collected data; the host computer is used to integrate four electrochemical tests of differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry through a parallel structure. The embodiment of the present application realizes data collection and output through a hardware circuit, processes data through a data acquisition card, realizes signal processing and display through a host computer, and reduces the volume of the system through a portable module design. At the same time, the parallel structure enables the electrochemical test process to be carried out synchronously, thereby improving the detection efficiency. The embodiment of the present application is conducive to reducing the system volume and improving the detection efficiency.

[0008] In addition, the electrochemical pulse voltammetry detection system according to the above embodiment of the present invention may also have the following additional technical features:

[0009] Furthermore, in the electrochemical pulse voltammetry detection system of an embodiment of the present invention, the hardware circuit includes a trans-impedance switching module, and the trans-impedance switching module includes a transistor and a relay. The host computer controls the conduction and closing of the transistor through the digital IO port on the data acquisition card, thereby controlling the gear switching of the relay.

[0010] Furthermore, in one embodiment of the present invention, the digital IO port on the data acquisition card is connected to the base of the transistor, the collector of the transistor is connected to the coil of the relay, the transmitter of the transistor is grounded, the switch of the relay includes different gear switches, and the gear switch is connected to the transimpedance.

[0011] Furthermore, in one embodiment of the present invention, the collected voltage waveform is connected to the waveform input interface, the waveform input interface is connected to the non-inverting input terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, the reference electrode is connected to the non-inverting input terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the output terminal of the first operational amplifier and the output terminal of the second operational amplifier are both connected to the inverting input terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, and the output terminal of the third operational amplifier is connected to the counter electrode; the working electrode is connected to the inverting input terminal of the fourth operational amplifier, the non-inverting input terminal of the fourth operational amplifier is grounded, and the output terminal of the fourth operational amplifier is connected to the AI ​​port of the data acquisition card.

[0012] Further, in one embodiment of the present invention, AI_GND and AO_GND of the data acquisition card are both grounded to use a reference single-ended connection for analog access.

[0013] Furthermore, in one embodiment of the present invention, the host computer is used to process and display the signal from the data acquisition card through an input task, and output a specific waveform sequence to the AO port of the data acquisition card through an output task.

[0014] Furthermore, in one embodiment of the present invention, the host computer is used to determine the output level of the digital IO port of the data acquisition card through the created first control to achieve cross-impedance switching.

[0015] On the other hand, an embodiment of the present invention provides an electrochemical pulse voltammetric detection method, which is applied to the above-mentioned electrochemical pulse voltammetric detection system. The method includes:

[0016] The data acquisition card receives the waveform sequence sent by the host computer and outputs the analog voltage waveform through the three-electrode module based on the high-precision DAC;

[0017] The data acquisition card receives the collected data sent by the hardware circuit, and transmits the collected data to the host computer based on the high-precision ADC, wherein the host computer is used to integrate four electrochemical tests of differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry through a parallel structure.

[0018] Furthermore, the electrochemical pulse voltammetric detection method of the embodiment of the present invention further includes:

[0019] The data acquisition card receives the control signal from the host computer and determines the output level of the digital IO port to switch the transimpedance.

[0020] Furthermore, the electrochemical pulse voltammetric detection method of the embodiment of the present invention further includes:

[0021] The host computer creates an input task to process and display the signal from the data acquisition card;

[0022] The host computer creates an output task and outputs a specific waveform sequence to the AO port of the data acquisition card.

[0023] On the other hand, an embodiment of the present invention provides an electrochemical pulse voltammetric detection device, comprising:

[0024] at least one processor;

[0025] at least one memory for storing at least one program;

[0026] When the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the above-mentioned electrochemical pulse voltammetry detection method.

[0027] On the other hand, an embodiment of the present invention provides a storage medium storing a program executable by a processor, wherein the program executable by the processor is used to implement the above-mentioned electrochemical pulse voltammetric detection method when executed by the processor.

[0028] The improved system of the embodiment of the present invention includes: a data acquisition card, a host computer and a hardware circuit; the hardware circuit includes a three-electrode module, and the three-electrode module collects and outputs signals through a working electrode, a counter electrode and a reference electrode; the host computer is used to send a waveform sequence to the data acquisition card, the data acquisition card is used to receive the waveform sequence, and based on a high-precision DAC, outputs an analog voltage waveform through the three-electrode module; the hardware circuit is used to collect data through three electrodes, and transmit the collected data to the data acquisition card through an amplification circuit, the data acquisition card is used to receive the collected data, and transmit the collected data to the host computer based on a high-precision ADC; the host computer is used to process the collected data and display the collected data; the host computer is used to integrate four electrochemical tests of differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry through a parallel structure. The embodiment of the present application realizes data collection and output through a hardware circuit, processes data through a data acquisition card, realizes signal processing and display through a host computer, and reduces the volume of the system through a portable module design. At the same time, the parallel structure enables the electrochemical test process to be carried out synchronously, thereby improving the detection efficiency. The embodiment of the present application is conducive to reducing the system volume and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic structural diagram of an embodiment of an electrochemical pulse voltammetric detection system provided in the present application;

[0031] FIG2( a ) is a waveform diagram of an embodiment of a voltage waveform sequence corresponding to differential pulse voltammetry provided in the present application;

[0032] FIG2( b ) is a waveform diagram of an embodiment of a voltage waveform sequence corresponding to conventional pulse voltammetry provided in the present application;

[0033] FIG2( c ) is a waveform diagram of an embodiment of a voltage waveform sequence corresponding to the square wave voltammetry method provided in the present application;

[0034] FIG2( d ) is a waveform diagram of an embodiment of a voltage waveform sequence corresponding to the linear voltammetry method provided in the present application;

[0035] Figure 3 An electrical schematic diagram of an embodiment of a three-electrode module provided in this application;

[0036] Figure 4 An electrical schematic diagram of an embodiment of the power supply processing provided by the present application;

[0037] Figure 5 An electrical schematic diagram of an embodiment of a transimpedance switching module provided in the present application;

[0038] Figure 6 A display interface diagram of an embodiment of the host computer provided by this application;

[0039] Figure 7 An interface diagram showing an embodiment of the differential pulse voltammetry detection process provided by the present application;

[0040] FIG8( a ) is a display interface diagram of another embodiment of the differential pulse voltammetry detection process provided by the present application;

[0041] FIG8( b ) is a diagram showing an interface of an embodiment of a square wave voltammetry detection process provided by the present application;

[0042] FIG8( c ) is a display interface diagram of an embodiment of a linear voltammetry detection process provided by the present application;

[0043] FIG8( d ) is a diagram showing an interface of an embodiment of a conventional pulse voltammetry detection process provided by the present application;

[0044] FIG9( a) is a schematic diagram showing the results of an embodiment of differential pulse voltammetry detection comparison provided by the present application;

[0045] FIG9( b ) is a schematic diagram of the results of an embodiment of the square wave voltammetry detection comparison provided by the present application;

[0046] FIG9( c ) is a schematic diagram of the results of an embodiment of the linear voltammetry detection comparison provided by the present application;

[0047] FIG9( d ) is a schematic diagram showing the results of an embodiment of conventional pulse voltammetry detection comparison provided in the present application. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0049] The electrochemical workstation is a tool that organically combines a potentiostat, a signal generator, and control software. It is widely used in material preparation and characterization. Through software control, it can perform a variety of electrochemical test methods such as differential pulse voltammetry, linear sweep voltammetry, conventional pulse voltammetry, and square wave voltammetry. In research, the electrochemical workstation can be used to measure the steady-state current of ultramicroelectrodes, and is applied to basic teaching of electroanalysis, battery material research, biochemistry (sensors), organic electrosynthesis, metallurgy, pharmaceuticals, environmental analysis, and other fields. In electrochemical testing, the most common is the three-electrode system, including the working electrode, the counter electrode, and the reference electrode; there is also a two-electrode system, which only includes the working electrode and the counter electrode. The two-electrode system is suitable for low potential conditions, is easy to operate and efficient, and will not polarize the counter electrode due to excessive current. The three-electrode system maintains the potential of the working electrode constant by adding a reference electrode to the two-electrode system, and realizes current measurement by adjusting the potential. When the working electrode current is large, a measurement loop is formed through the reference electrode and the working electrode, and a non-polarized current passes through, and the current is very small, avoiding errors and damage caused by electrode polarization. The working electrode and the counter electrode form a polarization circuit, which transmits electrons and ensures the reaction on the working electrode. Therefore, the three-electrode system not only allows the polarization current to pass through the working electrode, but also ensures its potential control and measurement, achieving precise control and measurement of current and potential.

[0050] Linear sweep voltammetry (LSV) is a method in which an electrode potential that changes linearly with time is added between the working electrode and the reference electrode, and the current passing through the working electrode and the auxiliary electrode is recorded at the same time, thereby obtaining a voltammetric relationship curve between the electrode current and the electrode potential, namely, a linear sweep voltammogram.

[0051] Differential pulse voltammetry (DPV) is to superimpose a series of pulse signals as excitation signals on the basis of step linear scanning, and take the difference between the current value at the moment the pulse ends and the current value at the moment the pulse occurs as the electrolysis current △i in this cycle. As the potential increases, the electrolysis current △i in multiple cycles is continuously measured, and △i is plotted against E to obtain the differential pulse curve. Differential pulse voltammetry has higher resolution and can detect multiple elements and substances at the same time. The background current of differential pulse voltammetry is very flat. In addition, due to the current subtraction, the background current caused by the redox current of impurities is also greatly eliminated. Therefore, in addition to reducing the background current, DPV also has higher detection sensitivity and lower detection limit.

[0052] Square wave voltammetry (SWV) is a method in which a series of forward and reverse pulse signals (both with the same duration and applied at a specific frequency) are superimposed on a step linear scan by a constant potential instrument. The current of the forward and reverse pulses are deducted from each other to obtain a differential current curve. In each square wave cycle, the current is sampled twice. Once at the end of the previous pulse and the other at the end of the reverse pulse. Because the amplitude of the square wave is large, the reverse pulse will cause the product obtained from the previous pulse to undergo a reverse reaction, and the current difference measured twice is plotted against the basic step potential. This is very useful for improving measurement sensitivity, so this method is one of the important methods in electroanalytical chemistry.

[0053] Normal pulse voltammetry (NPV) is a method of measuring the Faraday current in the later stage of the pulse voltage by superimposing a square wave pulse voltage with an amplitude that increases with time on the basis of a constant preset voltage Ei. During the measurement process, current sampling is performed at the end of the voltage pulse, and the current-potential voltammetry curve is recorded in real time. It is mainly used for electrochemical analysis. Compared with intermittent polarography, it has a larger Faraday current and basically the same double-layer charging capacitance, and has better detection sensitivity and lower detection limit.

[0054] In the related art, voltammetric detection is performed by an electrochemical workstation. However, the electrochemical workstation is large in size and expensive. At the same time, multiple voltammetric detection processes need to be performed separately, which is inefficient.

[0055] The electrochemical pulse voltammetric detection system and implementation method according to the embodiment of the present invention are described in detail below with reference to the accompanying drawings. First, an electrochemical pulse voltammetric detection system according to the embodiment of the present invention is described with reference to the accompanying drawings.

[0056] Figure 1 1 is a schematic diagram of the structure of an electrochemical pulse voltammetric detection system according to an embodiment of the present invention, wherein the system specifically comprises:

[0057] The detection system comprises: a data acquisition card, a host computer and a hardware circuit;

[0058] The hardware circuit includes a three-electrode module, which collects and outputs signals through a working electrode, a counter electrode and a reference electrode;

[0059] The host computer is used to send the waveform sequence to the data acquisition card, and the data acquisition card is used to receive the waveform sequence and output the analog voltage waveform through the three-electrode module based on the high-precision DAC;

[0060] The hardware circuit is used to collect data through three electrodes, and transmit the collected data to the data acquisition card through an amplification circuit; the data acquisition card is used to receive the collected data, and transmit the collected data to the host computer based on a high-precision ADC; the host computer is used to process the collected data and display the collected data;

[0061] The host computer is used to integrate four electrochemical tests, namely differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry, through a parallel structure.

[0062] The purpose of the present invention is to provide an electrochemical pulse voltammetry detection method based on NI data acquisition card. The present invention controls the working process of NI data acquisition card through LabView host computer, which can give full play to the advantages of NI data acquisition card in data acquisition, and realize four different electrochemical test methods, namely conventional pulse voltammetry, linear voltammetry, differential pulse voltammetry and square wave voltammetry.

[0063] The present invention adopts the above technical solution, which has the following advantages:

[0064] 1. The LabView software that is compatible with the NI data acquisition card can display the sampled data in real time and quickly realize the display process of the test results.

[0065] 2. The portable electrochemical workstation greatly reduces the size of the overall system and keeps the cost within a controllable range; at the same time, it ensures the stability and accuracy of the data. The high-precision devices in the acquisition card are used in the process of waveform output, signal input, processing and output, which greatly increases the anti-interference and accuracy of the data. Currently, the data can reach an accuracy of 0.1uA.

[0066] Specifically, the present invention is an electrochemical pulse voltammetry detection system designed based on NI acquisition card, with four electrochemical detection methods: differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry. The present invention uses LabView software to complete the sequence of various waveforms, and then completes the output of the digital sequence through the high-precision DAC integrated in the NI acquisition card to obtain an accurate analog voltage waveform, which is then conditioned and output by the designed three-electrode circuit module. In the data acquisition part, the three-electrode circuit is used to collect data, and after signal conditioning, the high-precision ADC module of the NI acquisition card is input through a transimpedance amplifier, and real-time data processing is performed on the LabView host computer, and the data is displayed.

[0067] This invention integrates four different electrochemical test methods, and the programming adopts a parallel structure, so that the electrochemical workstation can realize four different test methods at the same time, improving the efficiency of electrochemical testing. Waveform generation and data processing both use high-precision DAC and ADC modules in the NI acquisition card to ensure data stability and accuracy. Solution experiment results show that the voltammetric curves obtained by the four electrochemical test methods are stable and accurate.

[0068] Optionally, in the electrochemical pulse voltammetry detection system in the embodiment of the present invention, the hardware circuit includes a trans-impedance switching module, the trans-impedance switching module includes a transistor and a relay, and the host computer controls the conduction and closing of the transistor through the digital IO port on the data acquisition card, thereby controlling the gear switching of the relay.

[0069] In some possible implementations, the digital IO port of the data acquisition card is connected to the relay of the transimpedance switching module to switch the transimpedance from the working electrode to the data acquisition end to amplify the current signal.

[0070] Optionally, the digital IO port on the data acquisition card of the electrochemical pulse voltammetric detection system in the embodiment of the present invention is connected to the base of the transistor, the collector of the transistor is connected to the coil of the relay, the transmitter of the transistor is grounded, and the switch of the relay includes switches with different gear positions, and the gear switch is connected to the transimpedance.

[0071] Optionally, in the electrochemical pulse voltammetry detection system in the embodiment of the present invention, the collected voltage waveform is connected to the waveform input interface, the waveform input interface is connected to the non-inverting input terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, the reference electrode is connected to the non-inverting input terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the output terminal of the first operational amplifier and the output terminal of the second operational amplifier are both connected to the inverting input terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, and the output terminal of the third operational amplifier is connected to the counter electrode; the working electrode is connected to the inverting input terminal of the fourth operational amplifier, the non-inverting input terminal of the fourth operational amplifier is grounded, and the output terminal of the fourth operational amplifier is connected to the AI ​​port of the data acquisition card.

[0072] Optionally, in the electrochemical pulse voltammetric detection system in the embodiment of the present invention, AI_GND and AO_GND of the data acquisition card are both grounded to use a reference single-ended connection for analog access.

[0073] Optionally, in the electrochemical pulse voltammetry detection system in the embodiment of the present invention, the host computer is used to process and display the signal from the data acquisition card through an input task, and output a specific waveform sequence to the AO port of the data acquisition card through an output task.

[0074] Optionally, in the electrochemical pulse voltammetry detection system in the embodiment of the present invention, the host computer is used to determine the output level of the digital IO port of the data acquisition card through the created first control to achieve trans-impedance switching.

[0075] Next, the electrochemical pulse voltammetric detection method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0076] An electrochemical pulse voltammetric detection method is provided in an embodiment of the present invention. The electrochemical pulse voltammetric detection method in the embodiment of the present invention can be applied to a terminal, a server, or software running in a terminal or a server. The terminal can be a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. The server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The electrochemical pulse voltammetric detection method in the embodiment of the present invention is applied to the electrochemical pulse voltammetric detection system described above, and mainly includes the following steps:

[0077] The data acquisition card receives the waveform sequence sent by the host computer and outputs the analog voltage waveform through the three-electrode module based on the high-precision DAC;

[0078] The data acquisition card receives the collected data sent by the hardware circuit, and transmits the collected data to the host computer based on the high-precision ADC, wherein the host computer is used to integrate four electrochemical tests of differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry through a parallel structure.

[0079] Optionally, the electrochemical pulse voltammetry detection method in the embodiment of the present invention further includes: a data acquisition card receives a control signal from a host computer, determines an output level of a digital IO port, and switches the transimpedance.

[0080] Optionally, the electrochemical pulse voltammetry detection method in the embodiment of the present invention further includes:

[0081] The host computer creates an input task to process and display the signal from the data acquisition card;

[0082] The host computer creates an output task and outputs a specific waveform sequence to the AO port of the data acquisition card.

[0083] The electrochemical pulse voltammetry detection system and detection method provided by the present application are described in detail below with a specific embodiment:

[0084] For the acquisition card connection relationship in the following embodiments of this application, illustratively, the NI acquisition card model selected for this system can be USB6343, which is a 32-channel AI (16-bit, 500kS / s), 4-channel AO (900kS / s), 48-channel DIO, USB multi-function I / O device. USB-6343 provides analog I / O, digital I / O, and four 32-bit counters / timers for PWM, encoders, frequency, event counting, etc. Onboard NI-STC3 timing and synchronization technology provides advanced timing capabilities, including independent analog and digital timing engines and retriggerable measurement tasks. USB-6343 is suitable for a wide range of applications from basic data logging to control and test automation. The included NI-DAQmx driver and configuration utility simplify configuration and measurement.

[0085] The electrochemical pulse voltammetry detection system provided in the embodiment of the present application shares 7 IO port resources of the NI acquisition card USB6343, namely AI0, AO0, AI_GND, AO_GND, P0.0, P0.1 and P0.2. The acquisition card USB6343 (i.e., the data acquisition card in the embodiment of the present application) communicates and transmits data with the PC end (i.e., the host computer in the embodiment of the present application) through a USB cable, and a separate power line is used to supply power to it.

[0086] The AI0 port receives the voltage signal processed by the external hardware amplifier circuit (i.e., the hardware circuit in the embodiment of the present application). The collected data is transmitted to the PC-side LabView software for processing via a USB cable. Analog input description: When the data acquisition system performs analog input acquisition AI (Analog Input), different signal connection configurations need to be performed according to the signal source and test conditions. There are mainly three modes: reference single-ended connection, non-reference single-ended connection, and differential connection.

[0087] 1. Reference single-ended connection RSE

[0088] In the referenced single-ended mode, the data acquisition system provides a common ground point (AI_GND) to the measured signal, which is usually connected to the ground of the data acquisition system. The advantage of the referenced single-ended mode is that the wiring is simple and the number of channels is twice that of the differential mode. However, it must be noted that the referenced single-ended mode is only suitable for floating signal sources that are not grounded. For example, many temperature sensors do not need to be grounded.

[0089] 2. Non-reference single-ended connection NRSE

[0090] In many test scenarios, the measured signal itself is grounded, so the RSE mode cannot be simply used at this time. Different grounding points will form ground loops due to different positions, affecting the test results. Therefore, it may be necessary to use the non-reference single-ended connection mode (NRSE). In this mode, the ground of the measured signal is not directly connected to the ground of the data acquisition card, but to the AI_SENSE provided by the data acquisition card. The AI_SENSE terminal is internally connected to the negative input terminal of the instrument amplifier (the internal circuit is omitted). In this way, the ground of the signal and the ground of the board are no longer common. The preamplifier circuit inside the NRSE is very similar to the differential amplifier circuit, so the NRSE mode is often called the pseudo-differential mode. The advantage of the NRSE mode is that the number of channels is still twice that of the differential mode. However, in terms of common-mode rejection and other performance, it is similar to the RSE and inferior to the differential mode.

[0091] 3. Differential connection

[0092] The differential connection mode provides positive and negative signal inputs. The positive end of the signal source is connected to AI+, and the negative end of the signal source is connected to AI-. If the negative end of the signal source is grounded, the differential mode can effectively avoid interference caused by the ground line, so the differential mode has better noise suppression than the single-ended mode.

[0093] In one embodiment, the detection system may select a reference single-ended connection RSE as a data analog input mode.

[0094] AO0 port outputs specific waveforms of different electrochemical test methods to the external amplifier circuit, and the waveforms are shown in Figure 2. The four electrochemical test methods correspond to four different voltage waveforms (as shown in Figure 2(a), Figure 2(b), Figure 2(c) and Figure 2(d)). The waveform data is written in the system software and called by the control program. When the software program is run, the corresponding waveform data will be transmitted to the DAC module of the acquisition card through the USB cable connected to the PC end, that is, the AO analog output port. The system selects AO0 as the waveform analog output port.

[0095] AI_GND and AO_GND connect the ground of the external amplifier circuit to the ground of the acquisition card to make them share the same ground. The reason for doing this is to use the analog input connection method of the reference single-ended connection RSE.

[0096] P0.0, P0.1 and P0.2 are digital IO ports on the acquisition card. The digital level signals 0 and 1 output by the acquisition card correspond to 0v and 5v respectively. Here, three digital IO ports are used to control the three relays of the external amplifier circuit to switch the transresistance from the working electrode end WE of the external amplifier circuit to the data acquisition end to achieve the effect of current amplification with different precisions. The current hardware transresistance selection is 1kΩ, 10kΩ, 100kΩ, 1MΩ. The corresponding current magnification is 10^3, 10^4, 10^5, 10^6 times. The range of the channel input configured by the AI ​​input task in DAQmx is -10 to 10. The current range that can be measured by this system is 0.1uA to 10mA.

[0097] For the external hardware amplifier circuit in the embodiment of the present application, in the three-electrode system, the counter electrode and the working electrode form a current loop, and substantially no current flows through the reference electrode, thereby maintaining a constant potential between the working electrode and the reference electrode. Figure 3 As shown, two JFET input amplifier TIOPA2140AIDR chips are selected to form a three-electrode circuit (i.e., a three-electrode module in the embodiment of the present application), and the three-electrode circuit leads to three electrode interfaces of WE, RE, and CE. The waveform input interface is connected to the acquisition card, and the voltage waveform signal of the acquisition card enters the hardware amplification circuit and enters the OPA2140AIDR chip (operational amplifier, JFET junction field effect tube) through a first-order RC filter. The electrode and the working electrode form a current loop, and the current signal is transmitted from the working electrode to the CV end through a transimpedance amplifier to become a voltage signal. This voltage signal is connected to the AI0 port of the acquisition card through the CV end, and then transmitted to the PC end through a USB cable for processing and restored to a current signal.

[0098] The OPA2140AIDR chip needs +5v and -5v for power supply. Figure 4 As shown, the power supply scheme of the external hardware amplifier circuit is USB power supply, which is stabilized to 5V through the linear regulator (LDO) REG102NA-5 / 250 chip, and generates a -5V voltage through the MAX660ESA+T power management chip.

[0099] Reference Figure 5As shown, three SRD-05VDC-SL-C relays are selected to form a trans-impedance switching circuit with three transistors. The digital IO port on the acquisition card controls the conduction and shutdown of the transistor, and whether the current generated by the transistor controls the switching of the relay gear. The hardware trans-impedance selection is 1kΩ, 10kΩ, 100kΩ, and 1MΩ. The corresponding current amplification factor is 10^3, 10^4, 10^5, and 10^6 times. Specifically, in the embodiment of the present application, the acquisition card uses a USB cable to communicate with the PC and transmit data. There are three digital IO port connection lines between the acquisition card and the amplifier circuit to control the trans-impedance switching of the hardware circuit; a data input port, a waveform output port, and a ground wire. The three wires drawn from the hardware circuit are RE counter electrode, CE reference electrode, and WE working electrode.

[0100] For the PC-side software program in the embodiment of the present application, DAQmx allows LabVIEW users to collect data and perform control operations through hardware devices (such as sensors, actuators, etc.). These operations can range from simple temperature measurements to complex high-speed data acquisition and control applications. DAQmx provides a rich set of LabVIEW functions and tools that enable users to configure and control various DAQ devices programmatically. These functions include configuring channels, setting sampling rates, starting and stopping data acquisition, etc. At the same time, it provides powerful real-time data processing functions, such as real-time signal analysis, real-time data filtering, etc., which are suitable for applications that require high-performance real-time response.

[0101] In some embodiments, reference Figure 6 The main interface diagram of the host computer is shown in the figure. The user can perform four types of electrochemical pulse voltammetry tests through the controls. Figure 7 As shown in the figure, for each electrochemical pulse voltammetry detection, the corresponding parameters need to be input. An input task is created in the program interface to process and display the signals collected from the acquisition card in real time. An output task is created, and the waveform sequence is written in the program interface. These waveform sequences are output to the AO channel of the acquisition card through the output task, and then transmitted to the reference electrode RE through the three electrodes of the external hardware amplification path. In order to better control the resistance switching module of the external hardware amplification circuit, three digital IO port outputs are created in the program interface to output the high and low level signals of the control relay, which are 0v and 5v respectively. The four transresistors 1kΩ, 10kΩ, 100kΩ, and 1MΩ are encoded as 000, 010, 100, and 101 respectively. The high and low bits of the encoding correspond to line2, line1, and line0 of the digital IO port respectively. A text drop-down list is created to control the digital IO port to output the corresponding level signal according to the corresponding encoding. In order to display the current-voltage curve in real time, an event trigger structure is created in the program. After the program runs, the event is triggered to display the previously processed data, and the data is saved to the pre-set file path according to the specified channel.

[0102] This application verifies the accuracy of the proposed electrochemical pulse voltammetric detection system and method through multiple examples, specifically:

[0103] Embodiment 1:

[0104] The differential pulse voltammetry test method of the electrochemical pulse voltammetry detection system based on the NI acquisition card is as follows:

[0105] A. Preparation of potassium ferrocyanide solution;

[0106] This experiment uses potassium ferrocyanide (K3[Fe(CN)6]) and potassium chloride (KCl) to prepare potassium ferrocyanide solution. In the experiment, 0.75 g of potassium ferrocyanide and 2.25 g of potassium chloride were weighed and dissolved in 30 ml of deionized water respectively. The preparation process of potassium ferrocyanide solution is as follows:

[0107] Step 21, weighing: Use a precision electronic balance to weigh 0.75 g of potassium ferrocyanide and 2.25 g of potassium chloride respectively.

[0108] Step 22, dissolution: put the weighed potassium ferrocyanide and potassium chloride into two 50 ml beakers respectively, add about 10 ml of deionized water, and stir gently with a glass rod to completely dissolve them.

[0109] Step 23, Mixing: Mix the solutions in the two beakers together and transfer to a 50 ml volumetric flask.

[0110] Step 24, make up to volume: Add deionized water to the mark and gently shake the volumetric flask to ensure that the solution is fully mixed.

[0111] Step 25, Storage: Store the prepared potassium ferrocyanide solution in a brown bottle, avoid light, and store it in a cool and dry place.

[0112] The molar mass of potassium ferrocyanide is 329.25 g / mol, so 0.75 g of potassium ferrocyanide is equivalent to 0.75 / 329.25=0.00228 mol. The volume of the final solution is 30 ml, or 0.03 liters. Therefore, the concentration of the prepared potassium ferrocyanide solution is 0.00228 mol / 0.03L=0.076 mol / L. Potassium chloride is added to improve the stability of the potassium ferrocyanide solution. The concentration of potassium chloride is 2.25 g / 74.55 g / mol / 0.03L=1.00 mol / L. This concentration of potassium chloride can effectively inhibit the decomposition of potassium ferrocyanide. Potassium ferrocyanide solution has a certain degree of toxicity. When using it, you should pay attention to safe operation and avoid contact with the skin and eyes. During the preparation process, you should wear protective gloves and glasses.

[0113] B. Functional verification – Differential pulse voltammetry;

[0114] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0115] Open the electrochemical pulse voltammetry detection system software of the NI acquisition card and select the DPV test method. Refer to the interface shown in Figure 8(a);

[0116] Set the parameters as follows:

[0117] InitE (initial potential): -0.2V;

[0118] FinalE (end point potential): 0.8V;

[0119] IncrE (potential increment): 0.004V;

[0120] Amplitude: 0.05V;

[0121] PulseWidth (pulse width): 0.05s;

[0122] SamplingWidth (sampling interval): 0.01s;

[0123] PulsePeriod (pulse period): 0.5s;

[0124] Sensitivity: 0.001A / V;

[0125] Observe the resulting peak to measure the response of potassium ferrocyanide.

[0126] Embodiment 2:

[0127] The square wave voltammetry test method of the electrochemical pulse voltammetry detection system based on the NI acquisition card is as follows:

[0128] A. Preparation of potassium ferrocyanide solution: the solution preparation process is the same as that in Example 1.

[0129] B. Functional verification – square wave voltammetry;

[0130] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0131] Open the electrochemical pulse voltammetry detection system software of the NI acquisition card and select the SWV test method. As shown in Figure 8(b), set the parameters as follows:

[0132] InitE (initial potential): -0.2V;

[0133] FinalE (end point potential): 0.8V;

[0134] IncrE (potential increment): 0.004V;

[0135] Amplitude: 0.025V;

[0136] Frequency (waveform frequency): 15Hz;

[0137] Sensitivity: 0.001A / V;

[0138] Observe the peak value obtained in the measurement.

[0139] Embodiment 3:

[0140] The linear voltammetry test method of the electrochemical pulse voltammetry detection system based on the NI acquisition card is as follows:

[0141] A. Preparation of potassium ferrocyanide solution; the solution was prepared as in Example 1.

[0142] B. Functional verification – linear voltammetry;

[0143] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0144] Open the electrochemical pulse voltammetry detection system software of the NI acquisition card and select the LSV test method. As shown in Figure 8(c), set the parameters:

[0145] InitE (initial potential): -0.2V;

[0146] FinalE (end point potential): 0.8V;

[0147] Scan Rate: 0.1V / s;

[0148] Sample Interval: 0.001V;

[0149] Sensitivity: 0.001A / V;

[0150] Observe the peak value obtained in the measurement.

[0151] Embodiment 4:

[0152] Conventional pulse voltammetry test method based on the electrochemical pulse voltammetry detection system of the NI acquisition card. The test method is as follows:

[0153] A. Preparation of potassium ferrocyanide solution: The solution was prepared as in Example 1.

[0154] B. Functional verification – square wave voltammetry;

[0155] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0156] Open the electrochemical pulse voltammetry detection system software of the NI acquisition card and select the NPV test method. Set the parameters as shown in Figure 8(d):

[0157] InitE (initial potential): -0.2V;

[0158] FinalE (end point potential): 0.8V;

[0159] IncrE (potential increment): 0.004V;

[0160] PulseWidth (pulse width): 0.05s;

[0161] SamplingWidth (sampling interval): 0.01s;

[0162] PulsePeriod (pulse period): 0.5s;

[0163] Sensitivity: 0.001A / V;

[0164] Observe the peak value obtained in the measurement.

[0165] Comparative Example 1:

[0166] The difference from Example 1 is that the commercial Shanghai Chenhua electrochemical workstation software is used as the test system, and the steps are as follows:

[0167] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0168] Open the Shanghai Chenhua electrochemical workstation software and select the Differential Normal Pulse Voltammetry option.

[0169] The setting parameters are the same as those in Example 1.

[0170] Comparative Example 2:

[0171] The difference from Example 2 is that the commercial Shanghai Chenhua electrochemical workstation software is used as the test system, and the steps are as follows:

[0172] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0173] Open the Shanghai Chenhua electrochemical workstation software and select the Square Wave Voltammetry option.

[0174] The setting parameters are the same as those in Example 2; and the peak value obtained by the measurement is observed.

[0175] Comparative Example 3:

[0176] The difference from Example 3 is that the commercial Shanghai Chenhua electrochemical workstation software is used as the test system, and the steps are as follows:

[0177] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0178] Open the Shanghai Chenhua electrochemical workstation software and select the Linear Sweep Voltammetry option. Set the parameters the same as in Example 3. Observe the peak value obtained by the measurement.

[0179] Comparative Example 4:

[0180] The difference from Example 4 is that the commercial Shanghai Chenhua electrochemical workstation software is used as the test system, and the steps are as follows:

[0181] Take a 25mL beaker, use a commercial platinum electrode as the working electrode and counter electrode, take an Ag / AgCl electrode as the reference electrode, put them in the beaker, add 10mL of potassium ferrocyanide solution into the beaker, and immerse the electrodes in the solution.

[0182] Open the Shanghai Chenhua electrochemical workstation software and select the Linear Sweep Voltammetry option. Set the parameters the same as in Example 4. Observe the peak value obtained by the measurement.

[0183] Performance Testing:

[0184] For Example 1, Example 2, Example 3, and Example 4, as shown in FIG8 , the peak curve response is normal.

[0185] Comparative Examples 1, 2, 3 and 4 were compared with the same solution and the same parameter settings using a commercial Chenhua electrochemical workstation to verify the electrochemical pulse voltammetry detection system based on the NI acquisition card. As shown in Figures 9(a), 9(b), 9(c) and 9(d), it can be seen that the peak positions of the four electrochemical test methods remain consistent, the trends are the same, and the errors between peaks are within the acceptable range. The function of the electrochemical pulse voltammetry detection system based on the NI acquisition card was successfully verified.

[0186] It can be seen that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0187] The embodiment of the present invention provides an electrochemical pulse voltammetric detection device, comprising:

[0188] at least one processor;

[0189] at least one memory for storing at least one program;

[0190] When the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the electrochemical pulse voltammetry detection method.

[0191] Similarly, the contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0192] An embodiment of the present invention further provides a computer-readable storage medium, in which a program executable by a processor is stored. When the program executable by the processor is executed by the processor, it is used to perform the above-mentioned electrochemical pulse voltammetry detection method.

[0193] Similarly, the contents of the above method embodiments are all applicable to the present storage medium embodiments. The functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0194] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0195] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0196] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0197] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may be embodied in any computer-readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0198] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0199] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0200] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0201] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0202] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An electrochemical pulse voltammetric detection system, characterized in that: The detection system comprises: a data acquisition card, a host computer and a hardware circuit; The hardware circuit includes a three-electrode module, which collects and outputs signals through a working electrode, a counter electrode and a reference electrode; The host computer is used to send the waveform sequence to the data acquisition card, and the data acquisition card is used to receive the waveform sequence and output the analog voltage waveform through the three-electrode module based on the high-precision DAC; The hardware circuit is used to collect data through three electrodes, and transmit the collected data to the data acquisition card through an amplification circuit; the data acquisition card is used to receive the collected data, and transmit the collected data to the host computer based on a high-precision ADC; the host computer is used to process the collected data and display the collected data; The host computer is used to integrate four electrochemical tests, namely differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry, through a parallel structure.

2. The electrochemical pulse voltammetric detection system according to claim 1, characterized in that: The hardware circuit includes a transimpedance switching module, which includes a transistor and a relay. The host computer controls the on and off of the transistor through the digital IO port on the data acquisition card, thereby controlling the gear switching of the relay.

3. The electrochemical pulse voltammetric detection system according to claim 2, characterized in that: The digital IO port on the data acquisition card is connected to the base of the transistor, the collector of the transistor is connected to the coil of the relay, the transmitter of the transistor is grounded, the switch of the relay includes different gear switches, and the gear switch is connected to the transimpedance.

4. The electrochemical pulse voltammetric detection system according to claim 1, characterized in that: The collected voltage waveform is connected to the waveform input interface, the waveform input interface is connected to the non-inverting input terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, the reference electrode is connected to the non-inverting input terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the output terminal of the first operational amplifier and the output terminal of the second operational amplifier are both connected to the inverting input terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, and the output terminal of the third operational amplifier is connected to the counter electrode; the working electrode is connected to the inverting input terminal of the fourth operational amplifier, the non-inverting input terminal of the fourth operational amplifier is grounded, and the output terminal of the fourth operational amplifier is connected to the AI ​​port of the data acquisition card.

5. The electrochemical pulse voltammetric detection system according to claim 1, characterized in that: The AI_GND and AO_GND of the data acquisition card are both grounded to use a referenced single-ended connection for analog access.

6. The electrochemical pulse voltammetric detection system according to claim 1, characterized in that: The host computer is used to process and display the signal from the data acquisition card through an input task, and output a specific waveform sequence to the AO port of the data acquisition card through an output task.

7. The electrochemical pulse voltammetric detection system according to claim 1, characterized in that: The host computer is used to determine the output level of the digital IO port of the data acquisition card through the created first control to achieve cross-impedance switching.

8. An electrochemical pulse voltammetric detection method, characterized in that: Applied to the electrochemical pulse voltammetric detection system as claimed in claim 1, the method comprises: The data acquisition card receives the waveform sequence sent by the host computer and outputs the analog voltage waveform through the three-electrode module based on the high-precision DAC; The data acquisition card receives the collected data sent by the hardware circuit, and transmits the collected data to the host computer based on the high-precision ADC, wherein the host computer is used to integrate four electrochemical tests of differential pulse voltammetry, conventional pulse voltammetry, square wave voltammetry and linear voltammetry through a parallel structure.

9. The electrochemical pulse voltammetric detection method according to claim 8, characterized in that: The method further comprises: The data acquisition card receives the control signal from the host computer and determines the output level of the digital IO port to switch the transimpedance.

10. The electrochemical pulse voltammetric detection method according to claim 8, characterized in that: The method further comprises: The host computer creates an input task to process and display the signal from the data acquisition card; The host computer creates an output task and outputs a specific waveform sequence to the AO port of the data acquisition card.

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