An electrochemical reaction cell with adjustable magnetic field strength

Abstract

This invention discloses an electrochemical reaction cell with adjustable magnetic field strength and its application in the structural characterization of electrochemical reaction catalytic materials. The electrochemical reaction cell is a three-electrode system consisting of a working electrode, a reference electrode, and a counter electrode. All three electrodes are simultaneously immersed in an electrolyte solution and connected to an electrochemical workstation via different corresponding interfaces. The working electrode is surrounded by an electromagnetic induction coil, forming a localized alternating electromagnetic field environment. This electrochemical reaction cell design based on electromagnetic induction technology allows for the investigation of the surface charge properties and reaction mechanisms of catalytic samples in an electromagnetically induction environment, filling a technological gap in the field of electromagnetic induction electrochemical structural characterization and possessing strong practicality and promotional value.

Description

Technical Field

[0001] This invention belongs to the field of electrochemical battery technology, specifically relating to an electrochemical reaction cell with adjustable magnetic field strength and its application in characterizing the structure of electrochemical reaction catalytic materials. Background Technology

[0002] Electrochemistry has become a hot research area in catalysis in recent years. It boasts advantages such as mild reaction conditions, high energy efficiency, and good selectivity. Furthermore, electrochemistry is a crucial direction for catalytic reaction mechanisms and material innovation. By analyzing physicochemical parameters such as current and potential on the electrode surface, combined with other structural characterization techniques, the structure-activity relationship of materials can be studied in depth. Based on these characteristics, electrochemistry has recently been combined with other disciplines, including photocatalysis and thermocatalysis, forming many new academic branches and greatly promoting the development of the catalysis field. Therefore, related electrochemical reaction cells, including traditional three-electrode, two-electrode, salt-bridge systems, gas-liquid-solid three-phase systems, two-phase systems, and photoelectric systems, are constantly being developed, improved, and widely applied. These electrochemical cells can be categorized into three types based on their external power supply mode: pure electrical energy, photoelectric energy, and thermoelectric energy (single and combined power supply). However, with the emergence of new catalytic reaction power supply forms in recent years, existing electrochemical reaction designs are insufficient to meet the needs of these interdisciplinary fields.

[0003] Electromagnetic induction technology is a widely used energy supply technology. Its working principle involves converting electrical energy into electromagnetic energy and precisely delivering it to ferromagnetic materials, offering advantages such as high energy efficiency and rapid temperature response. In recent years, electromagnetic induction technology has emerged as a promising catalytic application in areas such as reverse water-gas shift reaction, VOCs catalytic oxidation, and CO2 methanation. Compared to traditional thermocatalytic reactions, electromagnetic induction technology can enable catalysts to exhibit higher activity and selectivity at lower temperatures. However, the promoting mechanism of electromagnetic induction and its impact on the surface charge of materials are still poorly understood. Summary of the Invention

[0004] To better study the electrochemical effects on the surface of catalytic materials in an electromagnetic environment, this invention combines electromagnetic induction technology with traditional electrochemical characterization techniques for the first time, and provides an electrochemical reaction cell with adjustable magnetic field strength.

[0005] According to one embodiment of the present invention, the electrochemical reaction cell is an electrochemical three-electrode system, consisting of a working electrode, a reference electrode, and a counter electrode. The three electrodes are simultaneously immersed in an electrolyte solution and are connected to an electrochemical workstation through different corresponding interfaces. The working electrode is surrounded by an electromagnetic induction coil to form a local alternating electromagnetic field environment.

[0006] According to one embodiment of the present invention, the electrochemical workstation is a multi-channel workstation.

[0007] According to one embodiment of the invention, the three electrodes are arranged in a triangle, wherein the working electrode is formed by connecting a catalytic sample and a wire, and is placed vertically in the center of the electromagnetic induction coil. The wire is, for example, a copper wire.

[0008] According to one embodiment of the present invention, the catalytic sample is a conventional choice in the art, such as ferromagnetic materials such as nickel foam, iron foam, or iron fiber cotton, preferably metallic iron fiber.

[0009] According to one embodiment of the present invention, the electromagnetic induction coil is directly connected to the output terminal of the ZVS electromagnetic emission circuit, and the input terminal of the ZVS electromagnetic emission circuit is connected to an adjustable DC power supply. By adjusting the input voltage of the DC power supply, the intensity of the radio frequency inductance current of the ZVS electromagnetic emission circuit is adjusted, thereby modulating the intensity of the electromagnetically induced magnetic field.

[0010] According to one embodiment of the present invention, the adjustable DC power supply can provide a DC output voltage of 4V-100V for the ZSV electromagnetic emission circuit, for example, any value among 4V, 8V, 12V, 24V, 32V, and 40V, or any value within a range formed by any two values.

[0011] According to one embodiment of the present invention, the different DC output voltages generated by the adjustable DC power supply can drive the ZVS electromagnetic emission circuit to generate high-frequency AC currents of different intensities, thereby generating an alternating magnetic field with an instantaneous intensity of 8 mT – 100 mT.

[0012] According to one embodiment of the present invention, the electromagnetic induction coil is covered with an insulating layer to prevent the metal inside the coil from directly contacting the electrolyte and causing a short circuit.

[0013] Preferably, the insulating material of the electromagnetic induction coil includes: insulating varnish, plastic insulating layer, polytetrafluoroethylene coating, high-density ceramic layer, etc.

[0014] According to one embodiment of the present invention, the working electrode and the electromagnetic induction coil are respectively fixed on different fixing holes of the electrode fixing plate.

[0015] According to one embodiment of the present invention, the difference (Rr) between the radius r of the catalytic sample and the radius R of the electromagnetic induction coil is not less than 5 mm, so as to ensure that the temperature change of the catalytic sample does not affect the induction coil.

[0016] According to one embodiment of the present invention, the reference electrode and the counter electrode are conventional choices in the art, for example, the reference electrode is Ag / AgCl and the counter electrode is Pt.

[0017] According to one embodiment of the present invention, the electrolyte solution is a conventional choice in the art, for example, the electrolyte solution is an aqueous solution of sodium borate.

[0018] According to another aspect of the present invention, the present invention also provides an application of the above-mentioned electrochemical reaction cell in the structural characterization of electrochemical reaction catalytic materials. When the magnetic field adjustable electrochemical reaction cell is in use, the DC voltage is adjusted to change the magnetic field strength of the working electrode and / or switch it on and off. The changes in the relative voltage and current parameters between the three electrodes caused by the change in the magnetic field strength are measured. By analyzing the changes, the surface charge migration behavior of the catalytic sample in the alternating electromagnetic field can be obtained.

[0019] The beneficial effects of this invention are:

[0020] The electrochemical reaction cell design based on electromagnetic induction technology in this invention can explore the surface charge properties and reaction mechanism of catalytic samples in an electromagnetic induction environment, filling the technical gap in the field of electromagnetic induction electrochemical structural characterization, and has strong practicality and promotion value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the design principle of the electromagnetic induction electrochemical reaction cell (i.e., an electrochemical reaction cell with adjustable magnetic field strength) of the present invention.

[0022] Figure 2 This is a schematic diagram of the electrode fixing plate of the electromagnetic induction electrochemical reaction cell of the present invention.

[0023] Figure 3 This diagram illustrates the relative positions of the working electrode and the induction coil in the electromagnetic induction electrochemical reaction cell of this invention.

[0024] Figure 4 This invention relates to the effect of an induced electromagnetic field on the cyclic voltammetry (CV) curve of an iron fiber catalytic material in an electromagnetic induction electrochemical reaction cell.

[0025] Figure 5 This invention relates to the detection of the induced current on iron fiber catalytic material by the induced electromagnetic field in the electromagnetic induction electrochemical reaction cell. Detailed Implementation

[0026] The design principles of the device of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0027] Example 1

[0028] Using metallic iron fibers as ferromagnetic catalytic samples, and with Figure 1 Taking the reaction apparatus as an example, 200 mg of iron fiber material is pressed into a short rod shape and connected to a copper wire as a working electrode, placed inside an induction coil. The induction coil is connected to a ZVS electromagnetic generator (i.e., a ZVS electromagnetic emission circuit), and the input terminal of the ZVS electromagnetic emission circuit is connected to an adjustable DC power supply. The difference between R and r is 5 mm. An Ag / AgCl electrode is used as the reference electrode, and Pt is used as the counter electrode. The three electrodes and the induction coil are respectively fixed on... Figure 2 The electrode was fixed on a plate and immersed in a 0.05 mol / L sodium borate aqueous solution. Cyclic voltammetry (CV) tests were performed on the ferromagnetic catalyst in both non-electromagnetic and electromagnetic induction-activated modes. The scan voltage was between -0.6 V and +0.6 V, and the scan rate was 0.05 V / s. The CV curves obtained in the electromagnetic and non-electromagnetic modes are shown below. Figure 4 As shown. From Figure 4 As can be seen, the alternating electromagnetic field directly affects the surface charge transfer of the material, promoting the occurrence of electrochemical reactions on the electrode surface. Therefore, compared with the non-electromagnetic induction state, the oxidation and reduction currents on the working electrode surface are stronger in the electromagnetic drive mode, with the reduction current increasing more significantly at negative potential.

[0029] Example 2

[0030] Metallic iron fibers are used as a representative of ferromagnetic catalytic materials, and... Figure 1 Taking the reaction apparatus as an example, 200 mg of iron fiber material is pressed into a short rod shape and connected to a copper wire as a working electrode, placed inside an induction coil. The induction coil is connected to a ZVS electromagnetic generator (i.e., a ZVS electromagnetic emission circuit), and the input terminal of the ZVS electromagnetic emission circuit is connected to an adjustable DC power supply. The difference between R and r is 5 mm. An Ag / AgCl electrode is used as the reference electrode, and Pt is used as the counter electrode. The three electrodes and the induction coil are respectively fixed on... Figure 2The material was placed on a limiting plate and immersed in a 0.05 mol / L sodium borate aqueous solution. In the current-time (it) mode of the electrochemical workstation, rapid switching between electromagnetic induction and non-electromagnetic induction modes was achieved by opening and closing the circuit, and the effect of electromagnetic induction on induced carriers on the surface of the ferromagnetic catalytic material was analyzed. Under open-circuit voltage, induced current was generated at the instants of turning on and off electromagnetic induction, such as... Figure 5 As shown.

[0031] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrochemical reaction cell with adjustable magnetic field strength, characterized in that, The electrochemical reaction cell is a three-electrode system. It consists of three electrodes: a working electrode, a reference electrode, and a counter electrode. All three electrodes are simultaneously immersed in an electrolyte solution and are connected to an electrochemical workstation through different corresponding interfaces. The working electrode is surrounded by an electromagnetic induction coil, forming a localized alternating electromagnetic field environment. When using an electrochemical reaction cell with an adjustable magnetic field, the DC voltage is adjusted to change the magnetic field strength of the working electrode and / or switch it on. The changes in the relative voltage and current parameters between the three electrodes caused by the change in the magnetic field strength are measured. By analyzing the changes, the surface charge migration behavior of the catalytic sample in the alternating electromagnetic field can be obtained.

2. The electrochemical reaction cell with adjustable magnetic field strength according to claim 1, characterized in that, The three electrodes are arranged in a triangle, with the working electrode formed by connecting the catalytic sample and a wire, and placed vertically in the center of the electromagnetic induction coil.

3. An electrochemical reaction cell with adjustable magnetic field strength according to claim 1, characterized in that, The electromagnetic induction coil is directly connected to the output terminal of the ZVS electromagnetic emission circuit, and the input terminal of the ZVS electromagnetic emission circuit is connected to an adjustable DC power supply.

4. An electrochemical reaction cell with adjustable magnetic field strength according to claim 3, characterized in that, The adjustable DC power supply provides a DC output voltage of 4 V-100 V for the ZSV electromagnetic emission circuit.

5. An electrochemical reaction cell with adjustable magnetic field strength according to claim 4, characterized in that, The 4V-100V range refers to any value among 4V, 8V, 12V, 24V, 32V, and 40V, or any value within a range formed by any two values.

6. An electrochemical reaction cell with adjustable magnetic field strength according to claim 3, characterized in that, The adjustable DC power supply generates different DC output voltages that drive the ZVS electromagnetic emission circuit to generate high-frequency AC currents of different intensities, thereby generating an alternating magnetic field with an instantaneous intensity of 8 mT – 100 mT.

7. An electrochemical reaction cell with adjustable magnetic field strength according to claim 1, characterized in that, The electromagnetic induction coil is covered with an insulating layer, and the insulating material of the electromagnetic induction coil includes: insulating varnish, plastic insulating layer, polytetrafluoroethylene coating or high-density ceramic layer.

8. An electrochemical reaction cell with adjustable magnetic field strength according to claim 2, characterized in that, The difference between the radius r of the catalytic sample and the radius R of the electromagnetic induction coil is not less than 5 mm.

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