Four-electrode electrolytic tank in electrochemical detector

Abstract

The invention discloses a four-electrode electrolytic tank in an electrochemical detector, which comprises a first electrode disc, a second electrode disc and a film, a groove structure with two transparent sides is etched on the film, and the groove structure, the first electrode disc and the second electrode disc form a tank body structure of the electrolytic tank; a first working electrode and a second working electrode are mounted in the first electrode disc, a counter electrode, a reference electrode, a first cable and a second cable are mounted in the second electrode disc, a solution inlet and a solution outlet are formed in the second electrode disc, and the solution inlet and the solution outlet respectively correspond to the inlet and the outlet of the cell body structure. According to the invention, two working electrode systems are introduced, so that the two working electrodes are matched with the reference electrode and the counter electrode to form a four-electrode electrolytic tank system, when a high-concentration leacheate is tested or gradient elution is used, peak generation during testing can be prevented from being influenced by a high baseline or baseline change, and the signal-to-noise ratio of a test signal is improved to a great extent; and the stability and repeatability of a test result are ensured.

Description

Technical Field

[0001] This invention relates to an ion chromatography detector, and more particularly to a four-electrode electrolytic cell in an electrochemical detector. Background Technology

[0002] In existing technologies, electrochemical detectors in ion chromatography instruments typically use a three-electrode electrolytic cell. This type of cell employs a working electrode and a counter electrode, with a potential applied between the reference and working electrodes via a reference electrode. Current flows through the circuit formed by the working and counter electrodes. This current is detected in real time, reflecting the concentration of the analyte. However, when testing high-concentration eluents or using gradient elution, the peak value is affected by high baselines or baseline variations, leading to poor accuracy, repeatability, and signal-to-noise ratio in the test results. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide a four-electrode electrolytic cell in an electrochemical detector to overcome the deficiencies of existing detection devices.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: a four-electrode electrolytic cell in an electrochemical detector, comprising a first electrode disk, a second electrode disk and a thin film, wherein a groove structure with open sides is etched on the thin film, and the thin film is pressed and fixed between the first electrode disk and the second electrode disk, so that the groove structure together with the first electrode disk and the second electrode disk constitutes the cell structure of the electrolytic cell.

[0005] The first electrode disk is equipped with a first working electrode and a second working electrode, and the second electrode disk is equipped with a counter electrode, a reference electrode, a first cable, and a second cable. The first working electrode, the second working electrode, the reference electrode, and the counter electrode are distributed sequentially along the flow direction of the cell structure, and the tips of the first working electrode, the second working electrode, the reference electrode, and the counter electrode extend into the interior of the electrolytic cell structure, so that after the solution is introduced into the cell structure, the tips of the first working electrode, the second working electrode, the reference electrode, and the counter electrode are all in contact with the solution.

[0006] The first working electrode is electrically connected to the first cable, and the second working electrode is electrically connected to the second cable;

[0007] The second electrode disk is provided with a solution inlet and a solution outlet, which correspond to the inlet and outlet of the pool structure, respectively.

[0008] Optionally, the first electrode disk is provided with a first cable contact and a second cable contact, the first cable contact is connected to the first working electrode through a first metal strip, and the second cable contact is connected to the second working electrode through a second metal strip;

[0009] The first cable contact is adapted to the first cable, and the second cable contact is adapted to the second cable.

[0010] Optionally, the cross-section of the first electrode disk includes two regions, namely a rectangular region and a trapezoidal region, with the first working electrode and the second working electrode distributed in the rectangular region, and the first cable contact and the second cable contact distributed in the trapezoidal region.

[0011] Optionally, the shape of the second electrode disk is adapted to the shape of the first electrode disk.

[0012] Optionally, the groove structure is a curved groove.

[0013] Optionally, both the first working electrode and the second working electrode are cylindrical electrodes.

[0014] By adopting the above technical solution, the present invention introduces a two-working-electrode system, which, together with the reference electrode and the counter electrode, forms a four-electrode electrolytic cell system. When testing high-concentration eluents or using gradient elution, the peak value during testing can be avoided from being affected by high baseline or baseline changes, which greatly improves the signal-to-noise ratio of the test signal and ensures the stability and repeatability of the test results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the first electrode disk of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the second electrode disk of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the thin film of the present invention. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1-3As shown, this invention discloses a four-electrode electrolytic cell for an electrochemical detector. The four-electrode electrolytic cell includes a first electrode disk 100, a second electrode disk 200, and a thin film 300. The thin film 300 is pressed and fixed between the first electrode disk 100 and the second electrode disk 200. Specifically, the first electrode disk 100 and the second electrode disk 200 are respectively provided with through-holes on both sides, and the thin film 300 is also provided with corresponding holes. During assembly, the thin film 300 is placed between the first electrode disk 100 and the second electrode disk 200, and then a screw tube is used to tighten it through the coaxial connecting holes of the three, thereby completing the pressing and fixing of the first electrode disk 100, the second electrode disk 200, and the thin film 300.

[0022] like Figure 4 As shown, a trench structure 310 with open sides is etched on the thin film 300, so that the trench structure 310, the first electrode disk 100, and the second electrode disk 200 form the cell structure of the electrolytic cell. In this invention, the trench structure 310 is a curved trench.

[0023] In this invention, a first working electrode 110 and a second working electrode 120 are installed in the first electrode disk 100. Both the first working electrode 110 and the second working electrode 120 are cylindrical electrodes. The first working electrode 110 is used to contact the sample solution and generate a redox reaction to obtain the analytical spectrum of the first sample result. The second working electrode 120 contacts the remaining sample solution to generate a redox reaction and obtain the analytical spectrum of the second sample result. At this time, the spectrum of the second sample result is used as the baseline and subtracted from the first sample result to obtain a sample spectrum with a high signal-to-noise ratio, thereby ensuring the stability and reliability of the detection results.

[0024] In this invention, the second electrode disk 200 is equipped with a counter electrode 210, a reference electrode 220, a first cable 230, and a second cable 240. The first working electrode 110 is electrically connected to the first cable 230, and the second working electrode 120 is electrically connected to the second cable 240. The counter electrode 210 is used to form a current loop with the first working electrode 110 and the second working electrode 120, and the reference electrode 220 is used to ensure the potential stability of the entire electrode system.

[0025] In this invention, the first working electrode 110, the second working electrode 120, the reference electrode 220, and the counter electrode 210 are distributed sequentially along the flow direction of the cell structure. That is, according to the flow direction of the sample solution, the first working electrode 110, the second working electrode 120, the reference electrode 220, and the counter electrode 210 are distributed sequentially. At the same time, the tips of the first working electrode 110, the second working electrode 120, the reference electrode 220, and the counter electrode 210 extend into the interior of the electrolytic cell structure, so that after the solution is introduced into the cell structure, the tips of the first working electrode 110, the second working electrode 120, the reference electrode 220, and the counter electrode 210 are all in contact with the solution, thereby forming a circuit.

[0026] In this invention, the second electrode disk 200 is provided with a solution inlet and a solution outlet. When a sample is introduced, the sample enters the pool structure from the solution inlet of the second electrode disk 200 and is discharged from the solution outlet. The solution inlet and solution outlet correspond to the inlet and outlet of the pool structure, respectively.

[0027] In this invention, the first electrode disk 100 is provided with a first cable contact 130 and a second cable contact 140. The first cable contact 130 is connected to the first working electrode 110 via a first metal strip, and the second cable contact 140 is connected to the second working electrode 120 via a second metal strip. The first cable contact 140 is adapted to the first cable 230, and the second cable contact 140 is adapted to the second cable 240.

[0028] In this invention, such as Figure 2 and Figure 3 As shown, the cross-section of the first electrode disk 100 can be set into two regions, namely a rectangular region and a trapezoidal region. The first working electrode 110 and the second working electrode 120 are distributed in the rectangular region, the first cable contact 130 and the second cable contact 140 are distributed in the trapezoidal region, and the shape of the second electrode disk 200 is adapted to the shape of the first electrode disk 100.

[0029] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0030] Apart from the technical features described in the specification, the other technical features are known to those skilled in the art. To highlight the innovative features of this invention, the other technical features will not be described in detail here.

Claims

1. A four-electrode electrolytic cell in an electrochemical detector, characterized in that, It includes a first electrode disk, a second electrode disk, and a thin film. The thin film is etched with a groove structure that is open on both sides. The thin film is pressed and fixed between the first electrode disk and the second electrode disk, so that the groove structure, the first electrode disk, and the second electrode disk constitute the cell structure of the electrolytic cell. The first electrode disk is equipped with a first working electrode and a second working electrode, and the second electrode disk is equipped with a counter electrode, a reference electrode, a first cable, and a second cable. The first working electrode, the second working electrode, the reference electrode, and the counter electrode are distributed sequentially along the flow direction of the cell structure, and the tips of the first working electrode, the second working electrode, the reference electrode, and the counter electrode extend into the interior of the electrolytic cell structure, so that after the solution is introduced into the cell structure, the tips of the first working electrode, the second working electrode, the reference electrode, and the counter electrode are all in contact with the solution. The first working electrode is electrically connected to the first cable, and the second working electrode is electrically connected to the second cable; The second electrode disk is provided with a solution inlet and a solution outlet, which correspond to the inlet and outlet of the pool structure, respectively.

2. The four-electrode electrolytic cell in the electrochemical detector according to claim 1, characterized in that, The first electrode disk is provided with a first cable contact and a second cable contact. The first cable contact is connected to the first working electrode through a first metal strip, and the second cable contact is connected to the second working electrode through a second metal strip. The first cable contact is adapted to the first cable, and the second cable contact is adapted to the second cable.

3. The four-electrode electrolytic cell in the electrochemical detector according to claim 2, characterized in that, The cross-section of the first electrode disk includes two regions, namely a rectangular region and a trapezoidal region. The first working electrode and the second working electrode are distributed in the rectangular region, and the first cable contact and the second cable contact are distributed in the trapezoidal region.

4. The four-electrode electrolytic cell in the electrochemical detector according to claim 3, characterized in that, The shape of the second electrode disk is adapted to the shape of the first electrode disk.

5. The four-electrode electrolytic cell in the electrochemical detector according to claim 4, characterized in that, The groove structure is a curved groove.

6. The four-electrode electrolytic cell in the electrochemical detector according to claim 1, characterized in that, Both the first working electrode and the second working electrode are cylindrical electrodes.

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