Method and equipment for testing proportion of resistance of each part in alkaline electrolytic cell under working condition

Abstract

The invention discloses a method and equipment for testing the proportion of resistance of each part in an alkaline electrolytic bath under working conditions, and belongs to the technical field of hydrogen production of the alkaline electrolytic bath. The method comprises the following steps: respectively connecting a cathode electrode and an anode electrode of the alkaline electrolytic bath to channels of a multi-channel electrochemical workstation through lead assemblies; carrying out open-circuit voltage test under different current conditions under the working condition to respectively obtain the total voltage inside the cathode electrode, the anode electrode, the diaphragm and the alkaline electrolytic cell; calculating the resistance of each part in the alkaline electrolytic bath according to the voltages obtained under different current conditions; and respectively calculating the resistance ratio of each part according to the resistance of each part. According to the invention, the resistance of each part such as a cathode, an anode and a diaphragm in the electrolytic cell can be accurately measured, and the proportion of the resistance in the total resistance of the electrolytic cell can be accurately calculated, so that scientific researchers and engineers can provide scientific basis for optimization design of the electrolytic cell; therefore, the hydrogen production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by alkaline electrolyzers, and more specifically to a method and device for testing the resistance ratio of various parts inside an alkaline electrolyzer under working conditions. Background Art

[0002] As the global demand for clean energy continues to grow, hydrogen energy, as an efficient and clean energy carrier, has received widespread attention. Alkaline water electrolysis hydrogen production technology occupies an important position in the field of hydrogen energy production due to its relatively low cost and high technical maturity.

[0003] As the core equipment for hydrogen production by alkaline water electrolysis, the performance of the alkaline electrolyzer directly affects the efficiency and cost of hydrogen production. The resistance inside the electrolyzer is one of the key factors affecting its performance. Accurately understanding the resistance ratio of each part inside the alkaline electrolyzer is of great significance for optimizing the electrolyzer design, improving hydrogen production efficiency, and reducing energy consumption.

[0004] At present, although the research on alkaline electrolyzers is constantly deepening, there are still deficiencies in the test methods for the resistance ratio of each part inside the electrolyzer. The existing test methods are often not accurate enough to accurately distinguish the resistance contribution of different components inside the electrolyzer. This makes it difficult to accurately distinguish the resistance contribution of different components inside the electrolyzer. This makes it difficult to find a basis for targeted improvements in the research and development and optimization of the electrolyzer, which limits the further development of alkaline water electrolysis hydrogen production technology and cannot effectively improve hydrogen production efficiency and reduce energy consumption.

[0005] Therefore, there is an urgent need for a method that can accurately test the resistance ratio of each part inside the alkaline electrolyzer to meet the needs of the ever-growing hydrogen energy industry and promote alkaline water electrolysis hydrogen production technology to a higher level. Summary of the invention

[0006] In view of this, the present invention provides a method and equipment for testing the resistance ratio of each part inside an alkaline electrolytic cell under a working condition that solves at least some of the above-mentioned technical problems. The method and equipment can accurately measure the resistance of each part such as the cathode, anode, and diaphragm in the electrolytic cell, and accurately calculate their proportion in the total resistance of the electrolytic cell, which helps researchers and engineers to provide a scientific basis for the optimal design of the electrolytic cell; and further helps to improve hydrogen production efficiency and reduce production costs by targetedly reducing the resistance of each part, promote the widespread application of alkaline water electrolysis hydrogen production technology, and contribute to the development of clean energy.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a method for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, the method comprising:

[0009] The cathode electrode and the anode electrode of the alkaline electrolytic cell are respectively connected to the channels on the multi-channel electrochemical workstation through the wire assembly;

[0010] Under working conditions, open circuit voltage tests were performed at different current conditions to obtain the total voltages of the cathode electrode, anode electrode, diaphragm and inside the alkaline electrolytic cell;

[0011] The resistance of each part in the alkaline electrolytic cell is calculated according to the voltage obtained under different current conditions; and the resistance proportion of each part is calculated according to the resistance of each part.

[0012] In a preferred embodiment, in the method, a reference electrode is further arranged in the alkaline electrolytic cell according to the type of solution in the alkaline electrolytic cell, and the reference electrode is connected to the multi-channel electrochemical workstation.

[0013] In a preferred embodiment, the reference electrode includes a first reference electrode and a second reference electrode, wherein: the first reference electrode is arranged between the cathode electrode and the diaphragm; the second reference electrode is arranged between the anode electrode and the diaphragm.

[0014] In a preferred embodiment, the operating conditions include: 95°C, 35 wt% KOH solution, and anode and cathode flow rates of 1.6 L / min respectively.

[0015] In a preferred embodiment, the different current conditions include: 1000A / m 2 、2000A / m 2 、3000A / m 2 、4000A / m 2 and 5000A / m 2 of current density.

[0016] In a second aspect, the present invention further provides a device for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, which performs the above-mentioned method for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions to complete the test of the resistance ratio of each part inside the alkaline electrolytic cell. The device comprises: a multi-channel electrochemical workstation and a wire assembly, wherein:

[0017] The multi-channel electrochemical workstation is connected to the cathode electrode and the anode electrode of the alkaline electrolytic cell respectively through a wire assembly; it is used to perform an open circuit voltage test under different current conditions under working conditions to obtain the total voltage of the cathode electrode, the anode electrode, the diaphragm and the inside of the alkaline electrolytic cell respectively; and calculate the resistance of each part in the alkaline electrolytic cell according to the voltage obtained under different current conditions; and then calculate the resistance ratio of each part according to the resistance of each part.

[0018] In a preferred embodiment, the device further comprises: a reference electrode, wherein the reference electrode is disposed in the alkaline electrolytic cell and connected to the multi-channel electrochemical workstation.

[0019] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0020] The present invention provides a method and device for testing the resistance ratio of each part inside an alkaline electrolyzer under working conditions, which can conveniently and accurately measure the resistance of each part such as the cathode, anode, and diaphragm in the electrolyzer, and accurately calculate its proportion in the total resistance of the electrolyzer. The present invention helps researchers and engineers to have a deep understanding of the internal working mechanism of the alkaline electrolyzer and provides a scientific basis for the optimal design of the electrolyzer. By specifically reducing the resistance of each part, the hydrogen production efficiency can be improved and the production cost can be reduced, which is conducive to promoting the widespread application of alkaline water electrolysis hydrogen production technology and contributing to the development of clean energy.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0025] Figure 1 Schematic diagram of the test principle of the resistance ratio of each part inside the alkaline electrolytic cell under the working conditions provided by an embodiment of the present invention.

[0026] Figure 2 A schematic diagram of the structure of an electrolytic cell provided in an embodiment of the present invention.

[0027] Figure 3 A schematic diagram of the voltage of various parts of the electrolytic cell at different current densities under the working conditions provided in an embodiment of the present invention.

[0028] Figure 4 A schematic diagram of the resistance ratio of each part of the electrolytic cell under different current densities provided in an embodiment of the present invention.

[0029] Figure 5 A schematic diagram of the states of the anode and cathode electrodes and the mastoid plate after the electrolysis reaction provided by an embodiment of the present invention.

[0030] Figure numerals: 1 - cathode plate, 2 - sealing ring, 3 - cathode mastoid plate, 4 - cathode grid, 5 - diaphragm, 6 - anode grid, 7 - anode mastoid plate, 8 - anode plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] In the description of the present invention, it should be noted that: in some processes described in the specification and drawings of this application, multiple operations appearing in a specific order are included, but it should be clearly understood that these operations may not be performed in the order in which they appear in this document or may be performed in parallel. In addition, various serial numbers are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 As shown, an embodiment of the present invention provides a method for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, and the method mainly includes:

[0035] A. Connect the cathode electrode and the anode electrode of the alkaline electrolytic cell to the channels of the multi-channel electrochemical workstation through the wire assembly;

[0036] B. Carry out open circuit voltage test under different current conditions under working conditions to obtain the total voltage of cathode electrode, anode electrode, diaphragm and inside alkaline electrolytic cell respectively;

[0037] C. Calculate the resistance of each part in the alkaline electrolytic cell according to the voltage obtained under different current conditions; and then calculate the resistance ratio of each part according to the resistance of each part.

[0038] Combination Figure 1-Figure 5As shown, the following takes a homemade electrolytic cell as an example to introduce the principle and implementation method of the method of the present invention in detail:

[0039] 1. Test equipment:

[0040] In this embodiment, the structure design of the homemade electrolytic cell (100mm*100mm) is as follows Figure 2 As shown, it mainly includes: cathode plate 1, sealing ring 2, cathode mastoid plate 3, cathode net 4, diaphragm 5, anode net 6, anode mastoid plate 7, anode plate 8. The test instruments and reagents used in the test experiment are shown in Table 1 below:

[0041] Table 1 Test instruments and reagents

[0042] Reagent / Instrument Name Reagent purity / Instrument model Multi-channel electrochemical workstation Donghua DH7007 Potassium hydroxide (KOH) Premium Pure DC Power Supply 200A / 30V / 6KW Circulation pump 25L / min Flow Meter 19L / min Constant temperature lye tank HH600C Three-in-one metal mastoid electrolyzer 100mm*100mm Diaphragm ---- Anode and cathode electrodes 100mm*100mm

[0043] 2. Experimental methods and principles:

[0044] In this embodiment, the voltage of each part of the electrolytic cell was tested by using a DH7007 multi-channel workstation using a four-electrode synchronous test method (the four electrodes here refer to the cathode electrode and the reference electrode a, the anode electrode and the reference electrode b. The reference electrode is used as a reference for measuring the electrode potential. It forms a loop with the cathode and the anode to monitor the cathode and anode potentials, respectively. It provides a stable and known potential reference point, which can avoid unnecessary interference with the experimental results and ensure the accuracy of the measurement). Figure 1 As shown, the cathode electrode and the reference electrode a, the anode electrode and the reference electrode b are connected to the four channels of the multi-channel workstation at the same time, and the total voltage of the cathode, anode, diaphragm and the inside of the electrolytic cell is obtained at different current densities (1000, 2000, 3000, 4000, 5000A) under working conditions. The resistance of each part of the electrolytic cell is calculated by the formula R=U / I. Finally, the proportion of the resistance of each part is calculated respectively.

[0045] 3. Experimental data and results:

[0046] In this embodiment, the voltage of each part of the electrolytic cell under different current densities was obtained by using a four-electrode synchronous test method at 95°C, 35wt% KOH solution, and anode and cathode flow rates of 1.6L / min respectively. The results are as follows Figure 3 As shown, it can be seen that as the current density continues to increase, the resistance of each part also gradually increases. Further, the resistance of each part under different currents is calculated by the formula R=U / I, and finally the resistance ratio of each part of the electrolytic cell is obtained. Figure 4As shown in the figure, as the current density increases, the resistance ratio of each part does not change significantly. However, in the entire current density range, the resistance ratio of the cathode part is the largest and basically maintains at 53%-58%. The results show that the cathode is the main factor affecting the performance of the electrolyzer.

[0047] Furthermore, by disassembling the electrolytic cell after the electrolysis reaction, it was found that the cathode mastoid plate and the cathode electrode surface were obviously covered with a layer of black material, while the anode mastoid plate and the anode electrode showed no obvious changes (such as Figure 5 It is possible that a chemical reaction occurred in the cathode during the electrolysis process, causing the cathode electrode to participate in chemical reactions other than the electrolysis of water, thereby increasing the cathode resistance.

[0048] From the description of the above embodiments, those skilled in the art can know that: the present invention provides a method for testing the proportion of resistance of each part inside an alkaline electrolytic cell under working conditions. This method can accurately and quickly determine the proportion of resistance of each part of the alkaline electrolytic cell under actual working conditions, thereby providing a strong basis for optimizing the design and performance of the electrolytic cell.

[0049] Further, see Figure 1 As shown, the present invention also provides a device for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, which is applied to the method for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions described in the above embodiment to complete the test of the resistance ratio of each part inside the alkaline electrolytic cell. The device mainly includes: a multi-channel electrochemical workstation, a wire assembly and a reference electrode, wherein:

[0050] The multi-channel electrochemical workstation is connected to the cathode electrode and the anode electrode of the alkaline electrolytic cell through a wire assembly; it is used to perform an open circuit voltage test under different current conditions under working conditions to obtain the total voltage of the cathode electrode, the anode electrode, the diaphragm and the inside of the alkaline electrolytic cell; and calculate the resistance of each part in the alkaline electrolytic cell according to the voltage obtained under different current conditions; and then calculate the resistance ratio of each part according to the resistance of each part. The reference electrode is arranged in the alkaline electrolytic cell, and the reference electrode is connected to the multi-channel electrochemical workstation.

[0051] An embodiment of the present invention provides a device for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions. Its implementation principle and technical effects are the same as those of the aforementioned method embodiment. For the sake of brief description, for parts not mentioned in this embodiment, reference can be made to the corresponding contents in the aforementioned method embodiment, which will not be repeated here.

[0052] It should be noted that the word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several distinct components, and by means of a suitably programmed computer.

[0053] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, characterized in that: The method includes: The cathode electrode and the anode electrode of the alkaline electrolytic cell are respectively connected to the channels on the multi-channel electrochemical workstation through the wire assembly; Under working conditions, open circuit voltage tests were performed at different current conditions to obtain the total voltages of the cathode electrode, anode electrode, diaphragm and inside the alkaline electrolytic cell; The resistance of each part in the alkaline electrolytic cell is calculated according to the voltage obtained under different current conditions; and the resistance proportion of each part is calculated according to the resistance of each part.

2. The method for testing the resistance ratio of each part inside the alkaline electrolytic cell under a working condition according to claim 1, characterized in that: In the method, a reference electrode is also arranged in the alkaline electrolytic cell according to the type of solution in the alkaline electrolytic cell, and the reference electrode is connected to the multi-channel electrochemical workstation.

3. The method for testing the resistance ratio of each part inside the alkaline electrolytic cell under a working condition according to claim 2, characterized in that: The reference electrode includes a first reference electrode and a second reference electrode, wherein: the first reference electrode is arranged between the cathode electrode and the diaphragm; the second reference electrode is arranged between the anode electrode and the diaphragm.

4. The method for testing the resistance ratio of each part inside an alkaline electrolytic cell under a working condition according to claim 1, characterized in that: The working conditions include: 95° C., 35 wt % KOH solution, and anode and cathode flow rates of 1.6 L / min respectively.

5. The method for testing the resistance ratio of each part inside an alkaline electrolytic cell under a working condition according to claim 1, characterized in that: The different current conditions include: 1000A / m 2 、2000A / m 2 、3000A / m 2 、4000A / m 2 and 5000A / m 2 of current density.

6. A device for testing the resistance ratio of each part inside an alkaline electrolytic cell under working conditions, characterized in that: When applied, the method for testing the resistance ratio of each part inside the alkaline electrolytic cell under a working condition as described in any one of claims 1 to 5 is performed to complete the test of the resistance ratio of each part inside the alkaline electrolytic cell. The device includes: a multi-channel electrochemical workstation and a wire assembly, wherein: The multi-channel electrochemical workstation is connected to the cathode electrode and the anode electrode of the alkaline electrolytic cell respectively through a wire assembly; it is used to perform an open circuit voltage test under different current conditions under working conditions to obtain the total voltage of the cathode electrode, the anode electrode, the diaphragm and the inside of the alkaline electrolytic cell respectively; and calculate the resistance of each part in the alkaline electrolytic cell according to the voltage obtained under different current conditions; and then calculate the resistance ratio of each part according to the resistance of each part.

7. The device for testing the resistance ratio of each part inside the alkaline electrolytic cell under a working condition according to claim 6, characterized in that: The device also includes: a reference electrode, which is arranged in the alkaline electrolytic cell and connected to the multi-channel electrochemical workstation.

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