Vertical electrochemical measurement cell and test method for simulating in-situ testing of fuel cells

Abstract

The present invention relates to a vertical electrochemical measuring cell and a testing method for simulating in-situ testing of a fuel cell. The vertical electrochemical cell comprises an electrolytic cell body, an electrolytic cell cover, a clamping assembly, a sealing assembly and a pressurizing assembly. The electrolytic cell cover is provided with a test window, an electrolytic cell gas escape outlet and an electrolyte addition reserved port. The electrolytic cell body is provided with a reference electrode, a counter electrode and a reducing gas conduit. The clamping assembly is a two-piece structure for clamping a test sample. The clamping assembly is placed in the test window. The bottom surface of the clamping assembly is provided with a notch for the electrolyte to pass through and contact the test sample. The sealing assembly is provided with a working electrode. The sealing assembly is arranged on the clamping assembly and the working electrode contacts the top surface of the clamping assembly. The sealing assembly is provided with an oxidizing gas through hole. The pressurizing assembly is fixed above the electrolytic cell cover. During testing, the pressurizing assembly applies a pressing force to the sealing assembly. Compared with the prior art, the present invention provides in-situ testing conditions and improves test accuracy and test efficiency.

Description

Technical Field

[0001] The invention relates to a vertical electrochemical measuring cell, in particular to a vertical electrochemical measuring cell for simulating in-situ testing of a fuel cell and a testing method. Background Art

[0002] In the complex context of the profound adjustment of the world's energy structure, the acceleration of global action to combat climate change, and the increasing resource and environmental constraints, hydrogen energy has been considered one of the major strategic directions for the transformation of the world's energy and power, and has attracted the attention of countries around the world. There are many ways to apply hydrogen energy, including fuel cells, gas turbines, hydrogen internal combustion engines, ordinary combustion and other methods. Fuel cells are currently one of the most important ways to apply hydrogen energy. Since they do not need to go through the Carnot cycle of a heat engine, they have higher potential efficiency than internal combustion engines. At the same time, there is no nitrogen oxide emission caused by hydrogen combustion, which is the most ideal way to use hydrogen energy. Fuel cells are in the early stages of commercial application and are facing problems such as insufficient life and high cost. It is urgent to further study its internal bipolar plates, membrane electrodes and other key components to improve the life of related components and reduce the use of internal precious metals. Therefore, it is necessary to refine the design of bipolar plates and membrane electrodes and conduct a large number of tests and verification experiments. There are two types of test experiments: in-situ experiments and ex-situ experiments. In-situ experiments refer to placing components in real fuel cells for related tests, which is time-consuming, costly, and has many interference factors. In order to more quickly measure certain properties of key components, ex-situ tests can be performed. In electrochemistry, electrochemical measuring cells are usually used, which can conveniently, quickly, and cost-effectively perform electrochemical experiments on samples of key components to characterize related performance.

[0003] After searching the literature on the prior art, it was found that the current research on electrochemical testing focuses on the electrochemical corrosion measurement of general materials and components to characterize the electrochemical properties of common samples.

[0004] Chinese Patent CN105758906A: An electrochemical testing device discloses an electrochemical testing device that is particularly suitable for metals that are difficult to weld and wire cut, and can accurately control the distance between electrodes and quickly replace working electrodes.

[0005] Chinese Patent CN206497017U: A Corrosion Electrochemical Testing Device discloses a corrosion electrochemical testing device including an electrolytic cell, an electrochemical testing device, a heating device and a heat preservation device, which can simulate the material corrosion process in a variety of complex corrosive gas environments.

[0006] Chinese Patent CN2581991Y: A Sealed Constant Temperature Electrochemical Measuring Cell discloses an electrochemical measuring cell capable of controlling the reaction temperature. The temperature of the reaction chamber is controlled by liquid water so that the reaction is not affected by the ambient temperature and can remain sealed when the electrodes and gas ducts are inserted. However, the invention is not intended for testing fuel cell components and the test conditions are too broad, which is not conducive to controlling experimental variables.

[0007] Chinese patent CN101004403A: Electrolytic cell for electrochemical testing discloses an electrochemical testing electrolytic cell comprising an upper cover plate, a lower cover plate and a sleeve. The electrolytic cell is made of plastic material, and the sample can be conveniently and firmly installed at the bottom of the electrolyte, and the experimental deviation caused by the corrosion of steel materials is avoided. The electrolytic cell can be used for electrochemical testing experiments of fuel cell membrane electrodes, but during use, the membrane electrode is located at the bottom of the test cell, and long-term immersion in the electrolyte will have structural and electrochemical effects on the membrane electrode, and the characteristics of the membrane electrode cannot be accurately reflected.

[0008] Chinese Patent CN102735604A: Electrolytic Cell for Corrosion Electrochemical Measurement discloses an electrolytic cell that can clamp and test the corrosion electrochemical properties of sheet materials, which can realize the rapid clamping of test samples and the assembly of experimental devices, and can meet the requirements of constant temperature electrochemical testing from room temperature to boiling conditions while maintaining the sealing performance of the working electrode. Although the device can test membrane electrodes with thin sheet structures, it is unable to confine the membrane electrodes more tightly, which will lead to stratification of the membrane electrodes after being immersed in the electrolyte due to different expansion degrees of different layered materials, and cannot simulate the in-situ state in the fuel cell, resulting in inaccurate test results and unable to meet the testing needs of key components of the fuel cell.

[0009] Although existing related studies have mentioned various types of electrochemical test cells that can test general samples, most of them have also been designed with constant temperature, but none of them are designed for the key components of fuel cells. They cannot guarantee the simultaneous presence of electrolytes and reaction gases, the in-situ conditions of samples during electrochemical testing, and the full plane of membrane electrodes and similar components during testing. This results in inaccurate data and an inability to reflect the in-situ performance through ex-situ experiments. Summary of the invention

[0010] The purpose of the present invention is to overcome the defects of the prior art and provide a vertical electrochemical measurement cell and a test method for simulating in-situ testing of a fuel cell.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] A vertical electrochemical measuring cell for simulating in-situ testing of a fuel cell comprises an electrolytic cell body, an electrolytic cell cover sealed therewith, a test window for placing a test sample, an electrolytic cell gas escape outlet and an electrolyte addition reserved port are provided on the electrolytic cell cover, a reference electrode, a counter electrode and a reducing gas conduit are provided in the electrolytic cell body, and the vertical electrochemical cell further comprises a clamping assembly, a sealing assembly and a pressurizing assembly, the clamping assembly is a two-piece structure, the test sample is clamped in the clamping assembly, the clamping assembly is placed in the test window, a notch is provided on the bottom surface of the clamping assembly for allowing the electrolyte to penetrate and contact the test sample, a working electrode is provided on the sealing assembly, the sealing assembly is arranged on the clamping assembly and the working electrode contacts the top surface of the clamping assembly, an oxidizing gas through hole is provided on the sealing assembly, and the pressurizing assembly is fixed above the electrolytic cell cover, and during testing, the pressurizing assembly applies vertical downward pressure to the sealing assembly.

[0013] The clamping assembly includes a sample clamp and a flow field plate. The sample clamp is provided with a plurality of strip grooves that penetrate the upper and lower surfaces of the sample clamp and are arranged in parallel. The lower surface of the flow field plate is provided with strip flow field grooves at positions corresponding to the strip grooves of the sample clamp. The test sample is flatly clamped between the sample clamp and the flow field plate.

[0014] The strip-shaped notches and the strip-shaped flow field grooves have the same width, and the width range is 0.5 mm to 3 mm.

[0015] The sealing assembly comprises a sealing cover and a sealing ring. The shape and size of the inner ring of the sealing cover match the clamping assembly. The sealing ring is embedded in the inner ring of the sealing cover, and the working electrode is embedded on the inner surface of the sealing cover.

[0016] The pressurizing assembly includes a top cover bracket, a pressurizing bracket, a pressurizing machine, a pressurizing push rod and a pressure plate. The top cover bracket is detachably mounted on the electrolytic cell cover. The pressurizing machine is fixed above the top cover bracket through the pressurizing bracket. The pressurizing push rod passes through the top cover bracket and is vertically arranged in the middle of the top cover bracket. One end of the pressurizing push rod is connected to the pressurizing machine, and the other end is connected to the pressure plate. When pressurizing, the pressure plate fits against the upper surface of the sealing assembly.

[0017] The electrolytic cell body comprises an electrolytic cell base and an electrolytic cell water jacket. The electrolytic cell base is provided with a base groove for installing the electrolytic cell water jacket. The electrolytic cell water jacket is sealed and installed on the base groove to form an electrolyte accommodating chamber. The electrolytic cell cover is sealed and installed on the top of the electrolytic cell water jacket.

[0018] The electrolytic cell body is provided with a level gauge for displaying the electrolyte level. The level gauge is located outside the water jacket of the electrolytic cell and is connected to the electrolyte containing chamber.

[0019] The level gauge is provided with a marking line at a position corresponding to the lower surface of the test sample in the clamping assembly, and the marking line is used to stop adding electrolyte when the electrolyte level in the electrolyte containing chamber reaches the position marked by the marking line during the test.

[0020] The middle area of ​​the electrolytic cell cover is sunken downward to form a concave plane, the test window is arranged on the concave plane, and the electrolytic cell cover is provided with a gas conduit reserved hole and a reference electrode reserved hole at positions corresponding to the positions of the reducing gas conduit and the reference electrode.

[0021] A test method for simulating in-situ testing of a fuel cell, based on the vertical electrochemical measuring cell, comprises the following steps:

[0022] S1. Inject electrolyte into the electrolytic cell body and make sure the liquid level is not higher than the test window;

[0023] S2. Place the clamping assembly with the test sample on the test window and install it horizontally, and seal the sealing assembly on the clamping assembly;

[0024] S3, start the pressurizing component to apply vertical downward pressure to the sealing component to compress the test sample;

[0025] S4. Add electrolyte into the electrolytic cell body through the electrolyte addition reserved port until the liquid level exceeds the lower surface position of the test sample;

[0026] S5. Connect the reference electrode, the counter electrode and the working electrode to the electrochemical workstation, and introduce the corresponding oxidizing gas and reducing gas through the oxidizing gas through hole and the reducing gas conduit to perform electrochemical testing.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) The present invention provides in-situ testing conditions such as an acidic environment, in-situ structure, in-situ interface, and reaction gas for the sample during the testing process, and can be used to test membrane electrode and similar component samples in fuel cells, avoiding the use of a fuel cell testing platform, and can accelerate the sample testing process, thereby conveniently, cost-effectively, and accurately analyzing the electrochemical performance and durability of the sample, thereby improving the development and testing efficiency of membrane electrode and similar components;

[0029] (2) The present invention uses a sample clamp and a flow field plate with a structure similar to a bipolar plate to clamp the sample, which can ensure that the sample is subjected to a relatively uniform force on the entire plane. Therefore, it can prevent the membrane electrode test sample from being decomposed due to different degrees of water absorption and expansion of different layered structures during the immersion process, thereby increasing the accuracy of the experiment.

[0030] (3) The clamping assembly of the present invention can simulate the stress state of the membrane electrode in the fuel cell by setting strip-shaped notches running through the upper and lower surfaces of the sample clamping plate and strip-shaped flow field grooves on the lower surface of the flow field plate, and provide reaction gas to the surface of the test sample, so that the electrochemical test has in-situ test conditions such as the acidic environment, in-situ structure, in-situ interface, and reaction gas of the fuel cell, so that the off-situ experiment can more accurately reflect the in-situ performance of the sample, greatly improving the test efficiency of the sample;

[0031] (4) The present invention uses a marking line to calibrate the height position of the lower surface of the test sample on the liquid level gauge, so that the height of the liquid level in the electrolytic cell can be accurately reflected, so that the lower surface of the sample is in continuous contact with the electrolyte, and there is no excessive liquid pressure, thereby ensuring the accuracy of the experiment, and being able to maintain the height of the liquid level during a long test process, thereby ensuring the effectiveness of the durability test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a vertical electrochemical measurement cell for simulating in-situ testing of a fuel cell according to the present invention;

[0033] Figure 2 It is a structural schematic diagram of the electrolytic cell cover of the present invention;

[0034] Figure 3 This is a schematic diagram of a membrane electrode test sample of the present invention;

[0035] Figure 4 This is a schematic diagram of the state change of the proton exchange membrane during water absorption during the test of membrane electrode samples in a general electrochemical measuring cell of the present invention.

[0036] In the figure, 1 is a pressurizing machine, 2 is a pressurizing support, 3 is a pressurizing push rod, 4 is a pressing plate, 5 is a top cover support, 6 is a reference electrode, 7 is an electrolytic cell cover, 8 is an electrolytic cell water outlet, 9 is an electrolytic cell water jacket, 10 is an electrolytic cell water inlet, 11 is an electrolytic cell base, 12 is a sealing component, 13 is a working electrode, 14 is a flow field plate, 15 is a reducing gas conduit, 16 is a test sample, 17 is a sample clamp, 18 is a liquid level gauge, 19 is an electrolyte, 20 is a counter electrode, 71 is a cover body, 72 is an electrolytic cell gas escape outlet, 73 is a reserved hole for installing a pressurizing component, 74 is a reserved hole for a reference electrode, 75 is a reserved hole for installing an electrolytic cell cover, 76 is a test window, 77 is a recessed boundary, 78 is a reserved hole for gas conduit, 79 is a reserved port for electrolyte addition, 161 is a proton exchange membrane, 162 is a catalyst layer, 163 is a microporous layer, and 164 is a gas diffusion layer. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the following embodiments are merely illustrative in nature, and the present invention is not intended to limit its applicable objects or uses, and the present invention is not limited to the following embodiments.

[0038] Example

[0039] like Figure 1 As shown, a vertical electrochemical measuring cell for simulating in-situ testing of a fuel cell comprises an electrolytic cell body, an electrolytic cell cover 7 sealed therewith is disposed on the electrolytic cell body, a test window 76 for placing a test sample 16, an electrolytic cell gas escape outlet 72 and an electrolyte addition reserved port 79 are provided on the electrolytic cell cover 7, a reference electrode 6, a counter electrode 20 and a reducing gas conduit 15 are disposed in the electrolytic cell body, the vertical electrochemical cell further comprises a clamping assembly, a sealing assembly 12 and a pressurizing assembly, the clamping assembly is a two-piece structure, the test sample 16 is clamped in the clamping assembly, the clamping assembly is placed in the test window 76, a notch is disposed on the bottom surface of the clamping assembly for allowing the electrolyte 19 to penetrate and contact the test sample 16, a working electrode 13 is disposed on the sealing assembly 12, the sealing assembly 12 is disposed on the clamping assembly and the working electrode 13 is in contact with the top surface of the clamping assembly, an oxidizing gas through hole is disposed on the sealing assembly 12, and a pressurizing assembly is fixed above the electrolytic cell cover 7, and during testing, the pressurizing assembly applies vertical downward pressure to the sealing assembly 12.

[0040] The electrolytic cell body includes an electrolytic cell base 11 and an electrolytic cell water jacket 9. The electrolytic cell base 11 is provided with a base groove for installing the electrolytic cell water jacket 9. The electrolytic cell water jacket 9 is sealed and installed on the base groove to form an electrolyte accommodating chamber. The electrolytic cell cover 7 is sealed and installed on the top of the electrolytic cell water jacket 9. The electrolytic cell water jacket 9 has an electrolytic cell water outlet 8 and an electrolytic cell water inlet 10, which can provide temperature management for the electrolytic cell. The electrolytic cell body is provided with a liquid level gauge 18 for displaying the liquid level of the electrolyte 19. The liquid level gauge 18 is located outside the electrolytic cell water jacket 9 and is connected to the electrolyte 19 accommodating chamber. A marking line is provided on the liquid level gauge 18 corresponding to the lower surface position of the test sample 16 in the clamping assembly. The marking line is used to stop adding the electrolyte 19 when the liquid level of the electrolyte 19 in the electrolyte accommodating chamber reaches the position marked by the marking line during the test.

[0041] like Figure 2As shown, the middle area of ​​the cover body 71 of the electrolytic cell cover 7 is sunken downward to form a sunken plane, and the test window 76 is provided on the sunken plane. A gas conduit pre-hole 78 and a reference electrode pre-hole 74 are provided on the electrolytic cell cover 7 outside the sunken boundary 77 corresponding to the positions of the reducing gas conduit 15 and the reference electrode 6, and reinforcing ribs are provided on both sides of the sunken area of ​​the electrolytic cell cover 7 to increase its strength. Outside the sunken boundary 77, the electrolytic cell cover 7 is also symmetrically distributed with 4 pressurizing component installation pre-holes 73 and 4 electrolytic cell cover installation pre-holes 75, the pressurizing component installation pre-holes 73 are used to fix the pressurizing component thereon by bolts, and the electrolytic cell cover installation pre-holes 75 are used to fix the electrolytic cell cover 7 to the electrolytic cell base 11 by bolts.

[0042] The clamping assembly includes a sample clamping plate 17 and a flow field plate 14. The sample clamping plate 17 is provided with a plurality of strip-shaped slots that penetrate the upper and lower surfaces of the sample clamping plate 17 and are arranged in parallel. A strip-shaped flow field groove is provided on the lower surface of the flow field plate 14 at the position corresponding to the strip-shaped slot of the sample clamping plate 17. The sample clamping plate 17 and the flow field plate 14 are formed with ridges on the ungrooved parts. The test sample 16 is laid flat and clamped between the sample clamping plate 17 and the flow field plate 14. The ridges of the sample clamping plate 17 and the flow field plate 14 are in one-to-one contact. The widths of the strip-shaped slots and the strip-shaped flow field grooves are equal, and the width range is 0.5 mm to 3 mm. The area proportions of the ridges on the sample clamping plate 17 and the flow field plate 14 are 0.2 to 0.8, respectively. In the electrolytic cell system, the sample clamping plate 17 and the flow field plate 14 are used together to ensure that the sample is not subjected to shear stress during the clamping process. The sample clamp 17 is made of an insulator, and the flow field plate 14 is made of a material with good conductivity, such as graphite, metal, etc., and both should be resistant to corrosion by the electrolyte 19. For different types of fuel cells, different sample clamps 17 and flow field plates 14 can be replaced to simulate the in-situ conditions of the membrane electrode in the fuel cell.

[0043] The sealing assembly 12 includes a sealing cover and a sealing ring. The shape and size of the inner ring of the sealing cover match the clamping assembly. The sealing ring is embedded in the inner ring of the sealing cover, and the working electrode 13 is embedded on the inner surface of the sealing cover. The sealing assembly 12 cooperates with the working electrode 13 to apply a uniform clamping force to the sample, maintain the sealing of the sample, and prevent gas and liquid leakage. At the same time, the required oxidizing gas is continuously introduced into the sample through the reserved oxidizing gas through hole. The working electrode 13 constitutes the working electrode 13 of the three-electrode system, applies a uniform clamping force to the sample flow field plate 14, and maintains a good circuit connection with the flow field plate 14.

[0044] The pressurizing assembly includes a top cover bracket 5, a pressurizing bracket 2, a pressurizing machine 1, a pressurizing push rod 3 and a pressing plate 4. The top cover bracket 5 is detachably mounted on the electrolytic cell cover 7. The top cover bracket 5 uses two cross-arranged ribs, the middle area of ​​the ribs is arched upward, and the two ends of the ribs are fixed on the electrolytic cell cover 7. The pressurizing machine 1 is fixed above the middle arched area of ​​the top cover bracket 5 through the pressurizing bracket 2. The pressurizing push rod 3 penetrates the top cover bracket 5 and is vertically arranged in the middle of the top cover bracket 5. One end of the pressurizing push rod 3 is connected to the pressurizing machine 1, and the other end is connected to the pressing plate 4. When pressurizing, the pressing plate 4 fits the upper surface of the sealing component 12. The pressurizing machine 1 provides a pressing force for the sealing cover, fixes the test sample 16, ensures sealing, and applies compressive stress to the sample to simulate the in-situ state of the fuel cell. The pressurizing machine 1 can be a cylinder pressurizing machine 1, a hydraulic pressurizing machine 1 or an electromagnetic pressurizing machine 1.

[0045] The test sample 16 is a membrane electrode assembly in a fuel cell, and can also be a multi-layered thin sheet sample, which is suitable for the membrane electrode test sample 16 of the electrochemical test cell of the present invention. Figure 3 , including a proton exchange membrane 161, a catalyst layer 162, a microporous layer 163 and a gas diffusion layer 164. The electrochemical test in the present invention uses a three-electrode system, including a working electrode 13, a counter electrode 20 and a reference electrode 6, which are connected to the corresponding interface of the electrochemical workstation during the test, and the test can be carried out after the sample is installed.

[0046] A test method for simulating in-situ testing of a fuel cell, based on the vertical electrochemical measuring cell, comprises:

[0047] First, assemble the electrolytic cell, place the electrolytic cell base 11 on a plane, place the electrolytic cell water jacket 9 on the base groove, with a sealing ring between the two for sealing, install the liquid level gauge 18 on the electrolytic cell base 11, and keep the inside of the liquid level gauge 18 connected to the inside of the electrolytic cell. Install the reference electrode 6 and the reducing gas conduit 15 on the electrolytic cell cover 7, and install the installed electrolytic cell cover 7 on the electrolytic cell water jacket 9, with a sealing ring between the two, and connect and tighten the electrolytic cell cover 7 to the electrolytic cell base 11 with bolts, and then connect the top of the liquid level gauge 18 to the reserved position of the electrolytic cell cover 7 to ensure that the liquid level gauge 18 can normally display the liquid level inside the electrolytic cell;

[0048] After the electrolytic cell is installed, pour the pre-configured electrolyte 19 into the electrolytic cell from the test window 76 of the sample clamping plate 17 that has not been installed, keeping the liquid level slightly lower than the height of the sample clamping plate 17, then install the sample clamping plate 17 into the reserved slot, and place the test sample 16 with the proton exchange membrane side facing down flatly on the sample clamping plate 17;

[0049] After the sample is placed, the top cover bracket 5 is installed on the electrolytic cell cover 7, and the pressurizing machine 1 is operated to push the pressurizing push rod 3 to press the sealing cover tightly. The test sample 16 is evenly stressed, and there is a sealing ring around it to prevent gas and liquid leakage, and further pressurize to reach a predetermined pressure. After the test sample 16 is pressed, a small amount of pre-configured electrolyte is added from the electrolyte addition reserved port 19 on the electrolytic cell cover 7 until the liquid level in the liquid level gauge 18 exceeds the scale line on the lower surface of the sample, and the electrolytic cell is slightly shaken until there are no residual bubbles on the sample surface;

[0050] Finally, the reference electrode 6, the counter electrode 20 and the working electrode 13 are connected to the electrochemical workstation, and the corresponding oxidizing gas and reducing gas are introduced through the oxidizing gas through hole and the reducing gas conduit 15 to perform electrochemical testing.

[0051] For general electrochemical measurement cells, since the sample is usually clamped with a round hole or a square hole, the center of the sample is not clamped, which does not conform to the actual state of the membrane electrode in the fuel cell, making the sample test not meet the in-situ conditions in the fuel cell. Figure 4 This is a schematic diagram of the state change of the proton exchange membrane during the water absorption process of the membrane electrode sample in the general electrochemical measurement cell test. Figure 4 (a) is a schematic diagram of the state of the proton exchange membrane before absorbing water. Figure 4 (b) is a schematic diagram of the state of the proton exchange membrane after absorbing water. After contacting the electrolyte 19, the different layers of the membrane electrode structure will absorb water and swell, and the degree of expansion of each layer is different. Among them, the proton exchange membrane close to the electrolyte 19 expands the most. Therefore, the sample will bulge toward the electrolyte 19, and a liquid cavity will be formed between different layers of the sample or between the sample and the splint, which interferes with the normal progress of the electrochemical test and cannot obtain accurate electrochemical test results.

[0052] In the present invention, the clamping of the membrane electrode test sample 16 uses a sample clamping plate 17 and a flow field plate 14 to ensure that the stress of the sample is close to that in the fuel cell. At the same time, since the support bars of the sample clamping plate 17 and the flow field plate 14 are spaced relatively small, it is possible to avoid the liquid cavity caused by different degrees of swelling after the different layer structures in the sample contact the electrolyte 19, thereby ensuring the accuracy of the test results and improving the problems of the general electrochemical measuring cell in testing the membrane electrode sample of the fuel cell. At the same time, there are gas through holes on the sealing cover, and different gases can be introduced into the sample under the flow field plate 14 to meet specific experimental requirements.

[0053] The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments can also be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the technical concept of the present invention.

Claims

1. A vertical electrochemical measuring cell for simulating in-situ testing of a fuel cell, comprising an electrolytic cell body, an electrolytic cell cover (7) sealed therewith, a test window (76) for placing a test sample (16), an electrolytic cell gas escape outlet (72) and an electrolyte addition reserved port (79) being provided on the electrolytic cell body, a reference electrode (6), a counter electrode (20) and a reducing gas conduit (15) being provided in the electrolytic cell body, characterized in that: The vertical electrochemical measuring cell also includes a clamping assembly, a sealing assembly (12) and a pressurizing assembly. The clamping assembly is a two-piece structure. A test sample (16) is clamped in the clamping assembly. The clamping assembly is placed in a test window (76). A notch is provided on the bottom surface of the clamping assembly for allowing an electrolyte (19) to penetrate and contact the test sample (16). A working electrode (13) is provided on the sealing assembly (12). The sealing assembly (12) is arranged on the clamping assembly and the working electrode (13) contacts the top surface of the clamping assembly. An oxidizing gas through hole is provided on the sealing assembly (12). The pressurizing assembly is fixed above the electrolytic cell cover (7). During testing, the pressurizing assembly applies vertical downward pressure to the sealing assembly (12). The clamping assembly comprises a sample clamping plate (17) and a flow field plate (14); the sample clamping plate (17) is provided with a plurality of strip-shaped slots which penetrate the upper and lower surfaces of the sample clamping plate (17) and are arranged in parallel; a strip-shaped flow field groove is provided on the lower surface of the flow field plate (14) at the position corresponding to the strip-shaped slots of the sample clamping plate (17); the test sample (16) is flatly clamped between the sample clamping plate (17) and the flow field plate (14); The sealing assembly (12) comprises a sealing cover and a sealing ring, the shape and size of the inner ring of the sealing cover match the clamping assembly, the sealing ring is embedded in the inner ring of the sealing cover, and the working electrode (13) is embedded on the inner surface of the sealing cover; The pressurizing assembly comprises a top cover bracket (5), a pressurizing bracket (2), a pressurizing machine (1), a pressurizing push rod (3) and a pressing plate (4); the top cover bracket (5) is detachably mounted on the electrolytic cell cover (7); the pressurizing machine (1) is fixed above the top cover bracket (5) through the pressurizing bracket (2); the pressurizing push rod (3) passes through the top cover bracket (5) and is vertically arranged in the middle of the top cover bracket (5); one end of the pressurizing push rod (3) is connected to the pressurizing machine (1) and the other end is connected to the pressing plate (4); when pressurizing, the pressing plate (4) is in contact with the upper surface of the sealing assembly (12); The electrolytic cell body comprises an electrolytic cell base (11) and an electrolytic cell water jacket (9); the electrolytic cell base (11) is provided with a base groove for mounting the electrolytic cell water jacket (9); the electrolytic cell water jacket (9) is sealed and mounted on the base groove to form an electrolyte accommodating chamber; the electrolytic cell cover (7) is sealed and mounted on the top of the electrolytic cell water jacket (9); The electrolytic cell body is provided with a liquid level meter (18) for displaying the liquid level of the electrolyte (19); the liquid level meter (18) is located outside the electrolytic cell water jacket (9) and is connected to the electrolyte containing chamber; A marking line is provided on the liquid level meter (18) at a position corresponding to the lower surface of the test sample (16) in the clamping assembly, and the marking line is used to stop adding the electrolyte (19) when the liquid level of the electrolyte (19) in the electrolyte containing chamber reaches the position marked by the marking line during the test; The middle area of ​​the electrolytic cell cover (7) is recessed downward to form a concave plane, and the test window (76) is provided on the concave plane. A gas conduit pre-reserved hole (78) and a reference electrode pre-reserved hole (74) are provided on the electrolytic cell cover (7) at positions corresponding to the positions of the reducing gas conduit (15) and the reference electrode (6).

2. A vertical electrochemical measurement cell for simulating in-situ testing of a fuel cell according to claim 1, characterized in that: The strip-shaped notches and the strip-shaped flow field grooves have the same width, and the width range is 0.5 mm to 3 mm.

3. A test method for simulating in-situ testing of a fuel cell, characterized in that: The method is based on the vertical electrochemical measuring cell according to any one of claims 1 to 2, and comprises the following steps: S1, injecting electrolyte (19) into the electrolytic cell body and ensuring that the liquid level is not higher than the test window (76); S2, placing the clamping assembly with the test sample (16) clamped therein flat at the position of the test window (76), and sealingly placing the sealing assembly (12) on the clamping assembly; S3, starting the pressurizing component to apply vertical downward pressure to the sealing component (12) to compress the test sample (16); S4, adding electrolyte (19) into the electrolytic cell body through the electrolyte addition reserved port (79) until the liquid level exceeds the lower surface position of the test sample (16); S5. Connect the reference electrode (6), the counter electrode (20) and the working electrode (13) to the electrochemical workstation, and introduce corresponding oxidizing gas and reducing gas through the oxidizing gas through hole and the reducing gas conduit (15) to perform electrochemical testing.

Images