A half-cell device for assessing electrochemical performance

Abstract

The application discloses a kind of half-cell devices for evaluating electrochemical performance, and its technical scheme is: including workbench, workbench top side is fixed with fixed plate, workbench top is equipped with performance test mechanism, sealing mechanism and suction disc control mechanism;Performance test mechanism includes connecting shell, connecting shell is equipped in workbench top, connecting shell side is equipped with multiple performance test components, performance test component includes fixed collar, fixed collar is fixedly connected with connecting shell, fixed collar inboard is equipped with support sleeve, fixed collar is movably connected with support sleeve, support sleeve inboard is fixedly connected with heat preservation liquid storage tank, the beneficial effects of the present application are: with humidification and heating system, can be tested under different working conditions, it is beneficial to reduce the performance difference obtained with industrial amplification, can also test oxygen reduction, add flow field plate structure, constitute gas diffusion layer, simulate the real working condition of catalyst in industrial application, the structure of catalyst layer, current and potential state are characterized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of half-cell device for evaluating electrochemical performance, and particularly relates to a half-cell device for evaluating electrochemical performance. BACKGROUND

[0002] The rotating disc electrode (RDE) technology is a commonly used technology for measuring the electrochemical performance of electrocatalysts. A small amount of catalyst is fixed on a smooth glassy carbon electrode, which is rotated at high speed to reduce or eliminate the influence of the diffusion layer, and the kinetic parameters and electrochemical performance of the catalyst can be quickly obtained. At present, many electrocatalytic reaction systems such as carbon dioxide reduction, nitrogen reduction and hydrogen oxidation reaction use RDE technology to quickly screen catalysts under laboratory conditions.

[0003] The performance obtained by the existing RDE test cannot be transferred to real devices. The reaction interface and operating conditions in the RDE test and the membrane electrode assembly (MEA) in industrial application are different. First, the catalyst environment in the RDE (thin layer on a small area glassy carbon disc) is very different from the thicker catalyst layer on a larger electrode in actual application. Second, the reactant gas dissolved in the electrolyte combines with the glassy carbon electrode in the rotating disc electrode, which limits the maximum current density that can be achieved, limiting the overall electrocatalytic process. When the rotation speed of the RDE is 1600 rpm, the current density is generally about 6 mAcm -2 However, the real MEA applied to industry can achieve a higher current density of up to 3000 mAcm -2 Therefore, although the RDE technology can quickly screen the performance of the catalyst, it is not a real catalytic environment and cannot capture the catalytic behavior under high current density and high overpotential. Moreover, the RDE technology can only be tested at normal temperature and pressure, which does not meet the conditions of most industrial applications. However, the MEA test is time-consuming and expensive, which is not conducive to the early screening and optimization of catalysts in the laboratory. Therefore, in the laboratory stage, the RDE technology is still used to screen the performance of the catalyst, but the performance of the screened catalyst cannot be effectively scaled up to industrial applications, and the efficiency of catalyst performance testing is low. SUMMARY

[0004] Therefore, the present application provides a half-cell device for evaluating electrochemical performance to solve the problem that the real catalyst loading and the real mass transfer conditions cannot be provided, the electrochemical performance cannot be effectively evaluated in the laboratory stage, the electrochemical performance cannot be effectively reflected in future industrial applications, and the efficiency of catalyst performance testing is low.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a half-cell device for evaluating electrochemical performance, comprising a workbench, a fixed plate is fixed on one side of the top of the workbench, a performance testing mechanism, a sealing mechanism and a suction cup control mechanism are arranged on the top of the workbench;

[0006] The performance testing mechanism comprises a connecting shell arranged on the top of the workbench, a plurality of performance testing components are arranged on one side of the connecting shell, the performance testing component comprises a fixed collar fixedly connected with the connecting shell, a support sleeve is arranged on the inner side of the fixed collar, the fixed collar and the support sleeve are movably connected, a heat preservation liquid storage tank is fixedly connected to the inner side of the support sleeve, a support plate is fixedly arranged on the top of the heat preservation liquid storage tank, a reference electrode and a counter electrode are respectively fixedly inserted into the top of the support plate, an insulating sleeve and an ion exchange membrane are respectively arranged in the heat preservation liquid storage tank, the ion exchange membrane is arranged at the bottom of the insulating sleeve, a connecting base is arranged at the bottom of the heat preservation liquid storage tank, a heating base is fixedly arranged at the bottom of the connecting base, the heating base is fixedly arranged on the top of the workbench, a flow field plate and a diffusion layer are arranged in the connecting base, the flow field plate is arranged at the bottom of the diffusion layer, a catalyst layer is embedded on the top of the diffusion layer, and a working electrode is fixedly inserted into one side of the connecting base.

[0007] Preferably, the sealing mechanism comprises a bottom clamping sleeve fixedly arranged at the bottom of the heat preservation liquid storage tank, a bottom clamping groove is arranged on the top of the connecting base, a slot is arranged on the top of the connecting base, a sealing air bag is embedded on the bottom of the heat preservation liquid storage tank, a second inflation tube is fixedly connected to one end of the sealing air bag, the second inflation tube penetrates through the heat preservation liquid storage tank, a first inflation tube is fixedly connected to the other end of the second inflation tube, a gas pump is fixedly arranged on one side of the fixed plate, and the output end of the gas pump is fixedly connected with the first inflation tube.

[0008] Preferably, the chuck control mechanism comprises two fixed side plates fixed on the top of the workbench, a lead screw connected between the two fixed side plates through a bearing, a first motor fixed on one side of one of the fixed side plates, the output end of the first motor fixedly connected with the lead screw, a plurality of sliding blocks threadedly sleeved on the outside of the lead screw, a limiting rod fixedly connected between the two fixed side plates, the limiting rod penetrating through and slidably connected with the sliding blocks, a chuck assembly provided on one side of each of the sliding blocks, the chuck assembly comprising a fixed top plate fixedly connected with the sliding block, a second electric push rod fixedly arranged on the bottom of the fixed top plate, a bottom plate fixedly connected with the output end of the second electric push rod, an annular air pipe fixedly connected with the top of the bottom plate, a plurality of chucks fixedly connected with the bottom of the bottom plate and penetrating through the bottom plate and fixedly connected with the annular air pipe, a second connecting pipe fixedly connected with one side of the annular air pipe, and a first connecting pipe fixedly connected with the other end of the second connecting pipe, a vacuum pump fixedly arranged on one side of the fixed plate, and the output end of the vacuum pump fixedly connected with the first connecting pipe.

[0009] Preferably, the performance testing mechanism further comprises a conveying assembly, the conveying assembly comprising a channel arranged in the heating base, an air inlet fixedly arranged on one side of the heating base, an air outlet fixedly arranged on the other side of the heating base, two inclined plates fixedly arranged in the channel, a gas heater fixedly connected with one end of the air inlet, a gas humidifier connected with the input end of the gas heater, an air inlet pipe fixedly connected with the output end of the gas humidifier, and an exhaust pipe fixedly connected with the other end of the air outlet.

[0010] Preferably, a rotating assembly is arranged on the top of the workbench, the rotating assembly comprising an annular outer gear fixedly sleeved on the outside of the support sleeve, a slide rail fixedly arranged in the connecting shell, a toothed plate sleeved on the outside of the slide rail and slidably connected with the slide rail, the toothed plate engaged with the annular outer gear, and a first electric push rod fixedly arranged on one side of the connecting shell and fixedly connected with the output end of the first electric push rod.

[0011] Preferably, two sliding blocks are fixedly arranged on one side of the connecting shell, two side sliding grooves are arranged in the side wall of the fixed plate, the two sliding blocks respectively extend into the two side sliding grooves, two lead screws are connected with the two sliding blocks through bearings in the two side sliding grooves, the two lead screws respectively penetrate through the two sliding blocks and are connected with the two sliding blocks through threads, two second motors are fixedly arranged on the top of the fixed plate, and the output ends of the two second motors are respectively fixedly connected with the two lead screws.

[0012] Preferably, support legs are fixedly connected with the four corners of the bottom of the workbench.

[0013] Preferably, a plurality of placing boxes are fixedly arranged on the top of the workbench.

[0014] Preferably, the workbench top is fixedly provided with a plurality of collecting boxes.

[0015] Preferably, the heating base and the connecting base are internally provided with two upflow channels which are communicated with the channels.

[0016] The embodiment of the present application has the following advantages:

[0017] 1. The multi-station catalyst layer testing device formed by the plurality of performance testing components can simultaneously test a plurality of catalyst layers at different temperatures and different humidities, realize simultaneous placement, removal and replacement of a new batch of catalyst layers, improve the detection efficiency, increase more comparison data, test the electrochemical behavior of the catalyst layer, after the addition of the gas diffusion layer, the transport of the reactants is similar to the MEA device, and the test results can be comparable to the MEA test results, and the humidification and heating system can be used to test under different working conditions, which is conducive to reducing the performance difference with the industrial amplification, and the oxygen reduction performance, nitrogen reduction performance and electrochemical performance of various gas catalytic reactions of the catalyst can be tested, the flow field plate structure is added to form a half-cell structure, the real working condition of the catalyst in industrial application is simulated, and the catalyst layer structure, current and potential state are characterized.

[0018] 2. The testing scheme is easier to design, and the device is suitable for early screening of the performance of the catalyst layer in the laboratory, the test results are reliable, the gap with industrial application is small, and the advantages of rapidity, simplicity and good comparability of the half-cell experiment are maintained, the suction cup control mechanism is used to realize automatic movement of the catalyst layer and the diffusion layer, the test is facilitated, the danger of the test is reduced, the sealing of the connection of the device is improved, and the accuracy of the test data is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can obtain other implementation drawings according to the provided drawings without creating any creative labor.

[0020] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions under which the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0021] Figure 1 The overall structure schematic diagram provided by the present application;

[0022] Figure 2 The overall structure sectional view provided by the present application;

[0023] Figure 3 The performance test assembly perspective view provided by the present application;

[0024] Figure 4 The performance test assembly sectional view provided by the present application;

[0025] Figure 5 The flow field plate perspective view provided by the present application;

[0026] Figure 6 The suction disc assembly perspective view provided by the present application;

[0027] Figure 7 The structure of the middle A part provided by the present application; Figure 2 The structure of the middle A part provided by the present application;

[0028] Figure 8 The connecting base sectional view provided by the present application.

[0029] In the figure: 1, workbench; 2, upper flow channel; 3, support leg; 4, collection box; 5, fixed side plate; 6, first motor; 7, connecting shell; 8, fixed plate; 9, support sleeve; 10, support plate; 11, fixed top plate; 12, heat preservation liquid storage tank; 13, reference electrode; 14, counter electrode; 15, placement box; 16, sliding block; 17, sliding block; 18, second motor; 19, lead screw; 20, first electric push rod; 21, first inflation tube; 22, air pump; 23, vacuum pump; 24, lead screw; 25, limiting rod; 26, first connecting tube; 27, side sliding chute; 28, air inlet tube; 29, gas humidifier; 30, gas heater; 31, second inflation tube; 32, air inlet; 33, heating base; 34, channel; 35, inclined plate; 36, air outlet; 37, exhaust pipe; 38, working electrode; 39, second electric push rod; 40, bottom clamping sleeve; 41, sealed air bag; 42, ion exchange membrane; 43, insulating sleeve; 44, annular outer gear; 45, fixed sleeve ring; 46, sliding rail; 47, toothed plate; 48, catalyst layer; 49, diffusion layer; 50, slotted; 51, bottom clamping groove; 52, connecting base; 53, flow field plate; 54, second connecting tube; 55, annular air pipe; 56, suction disc; 57, bottom plate. DETAILED DESCRIPTION

[0030] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See attached document Figures 1-8 The present invention provides a half-cell device for evaluating electrochemical performance, including a workbench 1, a fixing plate 8 fixedly provided on one side of the top of the workbench 1, and a performance testing mechanism, a sealing mechanism and a suction cup control mechanism provided on the top of the workbench 1.

[0032] The performance testing mechanism includes a connecting shell 7, which is located on top of the workbench 1. Multiple performance testing components are provided on one side of the connecting shell 7. Each performance testing component includes a fixing collar 45, which is fixedly connected to the connecting shell 7. A support sleeve 9 is provided inside the fixing collar 45, and the fixing collar 45 is movably connected to the support sleeve 9. A thermal insulation storage tank 12 is fixedly connected inside the support sleeve 9. A support plate 10 is fixedly installed on the top of the thermal insulation storage tank 12. A reference electrode 13 and a counter electrode 14 are respectively fixedly inserted into the top of the support plate 10. The heat-insulated liquid storage tank 12 is provided with an insulating sleeve 43 and an ion exchange membrane 42 inside. The ion exchange membrane 42 is located at the bottom of the insulating sleeve 43. The bottom of the heat-insulated liquid storage tank 12 is provided with a connecting base 52. A heating base 33 is fixedly installed at the bottom of the connecting base 52. The heating base 33 is fixedly installed on the top of the workbench 1. The connecting base 52 is provided with a flow field plate 53 and a diffusion layer 49 inside. The flow field plate 53 is located at the bottom of the diffusion layer 49. A catalyst layer 48 is embedded at the top of the diffusion layer 49. A working electrode 38 is fixedly inserted into one side of the connecting base 52.

[0033] In the embodiment, the flow field plate 53 is fixed on the heating base 33, and the heating base 33 is provided with the gas inlet 32, the gas outlet 36, the working electrode 38 and the channel 34 in which the thermocouple can be placed, the gas humidifier 29 and the gas heater 30 are connected through the gas inlet 32, the polytetrafluoroethylene storage tank 12 is provided with the support plate 10, the reference electrode 13 and the counter electrode 14 can be placed, the storage tank 12 has a heat preservation effect, at the beginning of the test, the gas is transported through the gas inlet pipe 28, the gas passes through the gas humidifier 29 and the gas heater 30, and then enters from the heating base 33, the inclined plate 35 has the effect of buffering the gas, preventing the gas from entering the flow field plate 53 through the upflow channel 2, and then being transported to the upflow channel 2 through the channel 34 in the heating base 33, and then reaching the catalyst layer 48 wetted by the electrolyte in the storage tank 12, the catalyst layer serves as the working electrode, and the reference electrode 13 and the counter electrode 14 in the electrolyte together form a three-electrode system, a plurality of performance test assemblies form a multi-station catalyst layer test device, which can simultaneously test a plurality of catalyst layers at different temperatures and different humidities, realize the simultaneous placement, removal and replacement of a new batch of catalyst layers, improve the detection efficiency, increase more comparison data, test the electrochemical behavior of the catalyst layer 48, after the diffusion layer 49 is added, the transport of the reactants is similar to the MEA device, and the test results can be comparable to the MEA test results, and the humidification and heating system can be used to test under different working conditions, which is conducive to reducing the performance difference with the industrial amplification, a large amount of gas is introduced into the gas inlet pipe 28 when the volt-ampere curve and the electrochemical impedance spectrum are tested, in the reaction process, the humidity and temperature of the entering gas can be controlled through the gas humidifier 29, the gas heater 30 and the heating base 33, the humidity and temperature data of multiple groups of gases are selected to be different, the current generated by the catalyst layer 48 is collected by the flow field plate 53, and then is led out through the working electrode 38 to form a current loop with the counter electrode 14, and the working electrode 38 forms a voltage loop with the reference electrode 13, protons from the electrolyte in the storage tank 12 reach the surface of the diffusion layer 49 through the ion exchange membrane 42, and an electrochemical reaction occurs between the gas entering through the flow channel of the flow field plate 53 and the diffusion layer 49, and the electrochemical performance is measured, so that a plurality of different catalyst layer test data are obtained;

[0034] Wherein, in order to realize the purpose of sealing, the device uses the following technical solutions to realize: the sealing mechanism includes a bottom sleeve 40, the bottom sleeve 40 is fixedly arranged at the bottom of the heat preservation liquid storage tank 12, the top of the connecting base 52 is provided with a bottom clamping groove 51, the top of the connecting base 52 is provided with a slot 50, the bottom of the heat preservation liquid storage tank 12 is embedded with a sealing air bag 41, one end of the sealing air bag 41 is fixedly connected with a second air pipe 31, the second air pipe 31 penetrates the heat preservation liquid storage tank 12, the other end of the second air pipe 31 is fixedly connected with a first air pipe 21, one side of the fixed plate 8 is fixedly provided with an air pump 22, the output end of the air pump 22 is fixedly connected with the first air pipe 21, the bottom sleeve 40 is rotated by ninety degrees and is completely buckled with the bottom clamping groove 51, at the same time, the top of the catalyst layer 48 is in contact with the bottom of the ion exchange membrane 42, in order to realize the sealing, the air pump 22 is started, the air pump 22 is started and the first air pipe 21 and the second air pipe 31 are inflated, so that the sealing air bag 41 is inflated, the sealing air bag 41 is closely attached to the slot 50, so as to realize the sealing purpose;

[0035] The device adopts the following technical scheme to achieve the purpose of the suction cup control: the suction cup control mechanism comprises two fixed side plates 5, the two fixed side plates 5 are fixedly arranged on the top of the workbench 1, a lead screw 24 is connected between the two fixed side plates 5 through bearings, one side of one of the fixed side plates 5 is fixedly provided with a first motor 6, the output end of the first motor 6 is fixedly connected with the lead screw 24, a plurality of sliding blocks 16 are sleeved on the outside of the lead screw 24 through threads, a limiting rod 25 is fixedly connected between the two fixed side plates 5, the limiting rod 25 penetrates through the plurality of sliding blocks 16 and is in sliding connection with the sliding blocks 16, one side of each of the plurality of sliding blocks 16 is provided with a suction cup assembly, the suction cup assembly comprises a fixed top plate 11, the fixed top plate 11 is fixedly connected with the sliding block 16, a second electric push rod 39 is fixedly arranged on the bottom of the fixed top plate 11, the output end of the second electric push rod 39 is fixedly connected with a bottom plate 57, the top of the bottom plate 57 is fixedly connected with an annular air pipe 55, a plurality of suction cups 56 are fixedly arranged on the bottom of the bottom plate 57, the plurality of suction cups 56 penetrate through the bottom plate 57 and are fixedly connected with the annular air pipe 55, one side of the annular air pipe 55 is fixedly connected with a second connecting pipe 54, the other end of the second connecting pipe 54 is fixedly connected with a first connecting pipe 26, one side of the fixed plate 8 is fixedly provided with a vacuum pump 23, the output end of the vacuum pump 23 is fixedly connected with the first connecting pipe 26, the second electric push rod 39 is started, the output end of the second electric push rod 39 is stretched out and drives the bottom plate 57 to move downward, so that the suction cups 56 on the bottom of the bottom plate 57 are in contact with the diffusion layer 49, the vacuum pump 23 is started, the vacuum pump 23 causes the first connecting pipe 26 and the second connecting pipe 54 to generate negative pressure, through the annular air pipe 55 and the suction cups 56, the suction cups 56 adsorb the diffusion layer 49, the catalyst layer 48 on the top of the diffusion layer 49 is between the bottom plate 57 and the diffusion layer 49, and the catalyst layer 48 is prevented from deviating through the extrusion of the diffusion layer 49 and the bottom plate 57, after the adsorption is completed, the output end of the second electric push rod 39 is retracted, so that the suction cups 56 on the bottom of the bottom plate 57 drive the diffusion layer 49 and the catalyst layer 48 to move out of the placing box 15, the first motor 6 is started, the first motor 6 is started and drives the lead screw 24 to rotate, so that the lead screw 24 drives the sliding block 16 to move, the sliding block 16 drives the fixed top plate 11 to move, the fixed top plate 11 drives the second electric push rod 39 and the bottom plate 57 to move, so that the diffusion layer 49 and the catalyst layer 48 also move, after the diffusion layer 49 and the catalyst layer 48 move to the center position on the top of the connecting base 52, the second electric push rod 39 is started again, so that the second electric push rod 39 drives the diffusion layer 49 and the diffusion layer 49 to enter the connecting base 52, after the positions completely match, the vacuum pump 23 is turned off, so that the adsorption of the suction cups 56 on the diffusion layer 49 and the catalyst layer 48 is released, and the catalyst layer 48 and the diffusion layer 49 after the test are conveyed away through the adsorption assembly;

[0036] Wherein, in order to realize the purpose of testing, the device adopts the following technical scheme: the performance test mechanism further includes a conveying assembly, the conveying assembly includes a channel 34, the channel 34 is opened in the heating base 33, one side of the heating base 33 is fixedly provided with an air inlet 32, the other side of the heating base 33 is fixedly provided with an air outlet 36, two inclined plates 35 are fixedly provided in the channel 34, one end of the air inlet 32 is fixedly connected with a gas heater 30, the input end of the gas heater 30 is connected with a gas humidifier 29, the output end of the gas humidifier 29 is fixedly connected with an air inlet pipe 28, the other end of the air outlet 36 is fixedly connected with an exhaust pipe 37, two upflow channels 2 are opened in the heating base 33 and the connecting base 52, the upflow channels 2 are communicated with the channel 34, the heating base 33 is provided with the air inlet 32, the air outlet 36, the working electrode 38 and the channel 34 where the temperature sensing thermocouple can be placed, the gas humidifier 29 and the gas heater 30 are connected through the air inlet 32, the heat preservation liquid storage tank 12 is a polytetrafluoroethylene liquid storage tank, the reference electrode 13 and the counter electrode 14 can be placed through the supporting plate 10, the heat preservation liquid storage tank 12 has a heat preservation effect, when the test starts, the gas is conveyed through the air inlet pipe 28, the gas passes through the gas humidifier 29 and the gas heater 30 and is introduced from the heating base 33, the inclined plate 35 has the effect of buffering the gas, preventing the gas from entering the flow field plate 53 without passing through the upflow channel 2, the remaining gas is conveyed to the upflow channel 2 through the channel 34 in the heating base 33 and is discharged through the air outlet 36 and the exhaust pipe 37;

[0037] Wherein, in order to realize the purpose of controlling the seal, the device adopts the following technical scheme: the workbench 1 is provided with a rotating assembly on the top, the rotating assembly includes an annular external gear 44, the annular external gear 44 is fixedly sleeved outside the supporting sleeve 9, the connecting shell 7 is fixedly provided with a sliding rail 46 inside, the sliding rail 46 is sleeved with a toothed plate 47 outside, the sliding rail 46 is slidingly connected with the toothed plate 47, the toothed plate 47 is engaged with the annular external gear 44, the connecting shell 7 is fixedly provided with a first electric push rod 20 on one side, the output end of the first electric push rod 20 is fixedly connected with the toothed plate 47, the first electric push rod 20 is started, the output end of the first electric push rod 20 pushes the toothed plate 47 to move, so that the toothed plate 47 slides on the sliding rail 46, at the same time, the toothed plate 47 is engaged with the annular external gear 44, the toothed plate 47 drives the annular external gear 44 to rotate, through the rotation of the annular external gear 44 by ninety degrees, the annular external gear 44 drives the supporting sleeve 9 to rotate, the supporting sleeve 9 drives the heat preservation liquid storage tank 12 to rotate, so that the heat preservation liquid storage tank 12 drives the bottom sleeve 40 to rotate;

[0038] Two sliding blocks 17 are fixed on one side of the connecting shell 7, two side sliding grooves 27 are formed in the side wall of the fixed plate 8, the two sliding blocks 17 extend into the two side sliding grooves 27 respectively, two shafts 19 are connected in the two side sliding grooves 27 through bearings, the two shafts 19 penetrate through the two sliding blocks 17 and are connected with the two sliding blocks 17 through threads, two second motors 18 are fixed on the top of the fixed plate 8, the output ends of the two second motors 18 are fixedly connected with the two shafts 19, the second motor 18 is started, the second motor 18 is started and drives the shaft 19 to rotate, the shaft 19 rotates and drives the sliding block 17 to move, the sliding block 17 drives the connecting shell 7 to move downward, the connecting shell 7 drives the fixed sleeve ring 45 to move downward, the fixed sleeve ring 45 drives the support sleeve 9 to move downward, and the support sleeve 9 drives the heat preservation liquid storage tank 12 to move downward;

[0039] The supporting legs 3 are fixedly connected to the four corners of the bottom of the workbench 1, and have a supporting effect.

[0040] The workbench 1 is provided with a plurality of placing boxes 15 and a plurality of collecting boxes 4 on the top, the catalyst layer 48 and the diffusion layer 49 to be evaluated are stacked and placed in the placing boxes 15, and the tested catalyst layer 48 and diffusion layer 49 are removed by the suction cup control mechanism to the inside of the collecting box 4.

[0041] The use process of the present application is as follows: when using the present application, the catalyst layer 48 and the diffusion layer 49 to be evaluated are stacked in the placing box 15, the second electric push rod 39 is started, the output end of the second electric push rod 39 is extended and drives the bottom plate 57 to move downward, the suction cup 56 at the bottom of the bottom plate 57 is in contact with the diffusion layer 49, the vacuum pump 23 is started, the vacuum pump 23 causes the first connecting pipe 26 and the second connecting pipe 54 to generate negative pressure, the suction cup 56 absorbs the diffusion layer 49 through the annular air pipe 55 and the suction cup 56, the catalyst layer 48 at the top of the diffusion layer 49 is between the bottom plate 57 and the diffusion layer 49, and the catalyst layer 48 is prevented from deviating through the extrusion of the diffusion layer 49 and the bottom plate 57, after the absorption is completed, the output end of the second electric push rod 39 is retracted, the suction cup 56 at the bottom of the bottom plate 57 drives the diffusion layer 49 and the catalyst layer 48 to move out of the placing box 15, the first motor 6 is started, the first motor 6 is started and drives the lead screw 24 to rotate, the lead screw 24 drives the sliding block 16 to move, the sliding block 16 drives the fixed top plate 11 to move, the fixed top plate 11 drives the second electric push rod 39 and the bottom plate 57 to move, and the diffusion layer 49 and the catalyst layer 48 also move, after the diffusion layer 49 and the catalyst layer 48 move to the center position at the top of the connecting base 52, the second electric push rod 39 is started again, the second electric push rod 39 drives the diffusion layer 49 and the catalyst layer 48 to enter the connecting base 52, after the position completely fits, the vacuum pump 23 is turned off, so that the suction of the suction cup 56 to the diffusion layer 49 and the catalyst layer 48 is released, the second motor 18 is started, the second motor 18 is started and drives the screw rod 19 to rotate, the screw rod 19 rotates and drives the sliding block 17 to move, the sliding block 17 drives the connecting shell 7 to move downward, the connecting shell 7 drives the fixed sleeve ring 45 to move downward, the fixed sleeve ring 45 drives the support sleeve 9 to move downward, the support sleeve 9 drives the heat preservation liquid storage tank 12 to move downward, after the bottom of the heat preservation liquid storage tank 12 is in contact with the connecting base 52, the bottom clamping sleeve 40 at the bottom of the heat preservation liquid storage tank 12 enters the bottom clamping groove 51, the first electric push rod 20 is started, the output end of the first electric push rod 20 drives the toothed plate 47 to move, the toothed plate 47 slides on the sliding rail 46, at the same time, the toothed plate 47 is in mesh with the annular external gear 44, the toothed plate 47 drives the annular external gear 44 to rotate, through the rotation of the annular external gear 44 by 90 degrees, the annular external gear 44 drives the support sleeve 9 to rotate, the support sleeve 9 drives the heat preservation liquid storage tank 12 to rotate, the heat preservation liquid storage tank 12 drives the bottom clamping sleeve 40 to rotate, the bottom clamping sleeve 40 rotates by 90 degrees and is completely buckled with the bottom clamping groove 51, at the same time, the catalyst layer 48 at the top is in contact with the ion exchange membrane 42 at the bottom, in order to realize sealing, the air pump 22 is started, the air pump 22 is started and causes the first inflation pipe 21 and the second inflation pipe 31 to inflate, so as to inflate the sealing air bag 41, the sealing air bag 41 is tightly in contact with the slot 50, so as to realize the sealing purpose;

[0042] The flow field plate 53 is fixed on the heating base 33, and the heating base 33 is provided with an air inlet 32, an air outlet 36, a working electrode 38 and a channel 34 in which a temperature measuring thermocouple can be placed. The air inlet 32 is connected with the gas humidifier 29 and the gas heater 30. The heat preservation liquid storage tank 12 is made of polytetrafluoroethylene. The reference electrode 13 and the counter electrode 14 can be placed through the support plate 10. The heat preservation liquid storage tank 12 has a heat preservation effect. When the test starts, the reaction gas is transported through the air inlet pipe 28. The gas passes through the gas humidifier 29 and the gas heater 30 and is introduced from the heating base 33. The inclined plate 35 has the effect of buffering the gas, preventing the gas from entering the flow field plate 53 without passing through the upflow channel 2, and transporting the gas to the upflow channel 2 through the channel 34 in the heating base 33, and then passing through the flow field plate 53 to the catalyst layer 48 wetted by the electrolyte in the heat preservation liquid storage tank 12. The catalyst layer serves as the working electrode and, together with the reference electrode 13 and the counter electrode 14 in the electrolyte, forms a three-electrode system. A plurality of performance test assemblies form a multi-station catalyst layer test device, which can simultaneously test the performance of the catalyst layer under different temperatures and different humidities, realize the simultaneous placement, removal and replacement of a new batch of catalyst layers, improve the detection efficiency, increase more comparison data, test the electrochemical behavior of the catalyst layer 48, and after the diffusion layer 49 is added, the transport of the reactants is similar to that of the MEA device, which can be comparable to the test results of the MEA. At the same time, the humidification and heating system can be tested under different dry and wet operating conditions, which is conducive to reducing the performance difference with the industrial amplification. When the volt-ampere curve and the electrochemical impedance spectrum are tested, a large amount of gas is introduced into the air inlet pipe 28. During the reaction process, the humidity and temperature of the test atmosphere entering through the gas humidifier 29, the gas heater 30 and the heating base 33 can be controlled. The humidity and temperature data of multiple test atmospheres are selected to be different. The current generated by the catalyst layer 48 is collected by the flow field plate 53 and then led out through the working electrode 38 to form a current loop with the counter electrode 14, while the working electrode 38 forms a voltage loop with the reference electrode 13. Ions from the electrolyte in the heat preservation liquid storage tank 12 pass through the ion exchange membrane 42 to the surface of the diffusion layer 49, and the gas entering through the flow channel of the flow field plate 53 reacts in the diffusion layer 49 and the polarization performance is measured, so as to obtain a plurality of different electrochemical reaction data.

[0043] The above description is only a preferred embodiment of the present application, and any skilled person in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement according to the technical solutions of the present application is within the scope of protection claimed by the present application.

Claims

1. A half-cell device for evaluating electrochemical performance, comprising a stage (1), characterized in that: A fixing plate (8) is fixedly provided on one side of the top of the workbench (1), and a performance testing mechanism, a sealing mechanism and a suction cup control mechanism are provided on the top of the workbench (1); The performance testing mechanism includes a connecting shell (7), which is located on the top of the workbench (1). Multiple performance testing components are provided on one side of the connecting shell (7). Each performance testing component includes a fixing collar (45), which is fixedly connected to the connecting shell (7). A support sleeve (9) is provided inside the fixing collar (45), and the fixing collar (45) is movably connected to the support sleeve (9). A thermal insulation liquid storage tank (12) is fixedly connected inside the support sleeve (9). A support plate (10) is fixedly provided on the top of the thermal insulation liquid storage tank (12). A reference electrode (13) and a counter electrode (14) are respectively fixedly inserted into the top of the support plate (10). The heat-insulating liquid storage tank (12) is provided with an insulating sleeve (43) and an ion exchange membrane (42) respectively. The ion exchange membrane (42) is located at the bottom of the insulating sleeve (43). The bottom of the heat-insulating liquid storage tank (12) is provided with a connecting base (52). The bottom of the connecting base (52) is fixedly provided with a heating base (33). The heating base (33) is fixedly located on the top of the workbench (1). The connecting base (52) is provided with a flow field plate (53) and a diffusion layer (49). The flow field plate (53) is located at the bottom of the diffusion layer (49). The top of the diffusion layer (49) is embedded with a catalyst layer (48). A working electrode (38) is fixedly inserted into one side of the connecting base (52). The workbench (1) is provided with a rotating assembly at the top. The rotating assembly includes an annular external gear (44). The annular external gear (44) is fixedly sleeved on the outside of the support sleeve (9). The connecting shell (7) is fixedly provided with a slide rail (46). The slide rail (46) is sleeved on the outside of the slide rail (46). The slide rail (46) and the toothed plate (47) are slidably connected. The toothed plate (47) meshes with the annular external gear (44). A first electric push rod (20) is fixedly provided on one side of the connecting shell (7). The output end of the first electric push rod (20) is fixedly connected to the toothed plate (47). Two sliding blocks (17) are fixedly provided on one side of the connecting shell (7). Two side sliding grooves (27) are opened on the side wall of the fixing plate (8). The two sliding blocks (17) extend into the two side sliding grooves (27) respectively. Two lead screws (19) are connected to the two side sliding grooves (27) through bearings. The two lead screws (19) pass through the two sliding blocks (17) respectively and are connected to the two sliding blocks (17) by threads. Two second motors (18) are fixedly provided on the top of the fixing plate (8). The output ends of the two second motors (18) are fixedly connected to the two lead screws (19) respectively. The performance testing mechanism also includes a conveying component, which includes a channel (34) located inside a heating base (33). An air inlet (32) is fixedly provided on one side of the heating base (33), and an air outlet (36) is fixedly provided on the other side of the heating base (33). Two inclined plates (35) are fixedly provided inside the channel (34). A gas heater (30) is fixedly connected to one end of the air inlet (32). A gas humidifier (29) is connected to the input end of the gas heater (30). An air inlet pipe (28) is fixedly connected to the output end of the gas humidifier (29). An exhaust pipe (37) is fixedly connected to the other end of the air outlet (36).

2. The half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: The sealing mechanism includes a bottom sleeve (40), which is fixedly installed at the bottom of the heat-insulating liquid storage tank (12). The top of the connecting base (52) is provided with a bottom slot (51) and a groove (50). The bottom of the heat-insulating liquid storage tank (12) is embedded with a sealing airbag (41). One end of the sealing airbag (41) is fixedly connected to a second inflation tube (31), which penetrates the heat-insulating liquid storage tank (12). The other end of the second inflation tube (31) is fixedly connected to a first inflation tube (21). An air pump (22) is fixedly installed on one side of the fixing plate (8), and the output end of the air pump (22) is fixedly connected to the first inflation tube (21).

3. A half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: The suction cup control mechanism includes two fixed side plates (5), which are fixedly mounted on the top of the workbench (1). A lead screw (24) is connected between the two fixed side plates (5) via a bearing. A first motor (6) is fixedly mounted on one side of one of the fixed side plates (5). The output end of the first motor (6) is fixedly connected to the lead screw (24). Multiple sliders (16) are threaded onto the outside of the lead screw (24). A limit rod (25) is fixedly connected between the two fixed side plates (5). The limit rod (25) passes through the multiple sliders (16) and is slidably connected to the sliders (16). A suction cup assembly is provided on one side of each of the multiple sliders (16). The suction cup assembly includes a fixed top plate (11). The fixed top plate (11) is fixedly connected to the slider (16). The bottom of the fixed top plate (11) is fixedly provided with a second electric push rod (39). The output end of the second electric push rod (39) is fixedly connected to the bottom plate (57). The top of the bottom plate (57) is fixedly connected with an annular air pipe (55). The bottom of the bottom plate (57) is fixedly connected with multiple suction cups (56). The multiple suction cups (56) all penetrate the bottom plate (57) and are fixedly connected to the annular air pipe (55). The annular air pipe (55) is fixedly connected to a second connecting pipe (54) on one side. The other end of the second connecting pipe (54) is fixedly connected to a first connecting pipe (26). The fixed plate (8) is fixedly provided with a vacuum pump (23) on one side. The output end of the vacuum pump (23) is fixedly connected to the first connecting pipe (26).

4. A half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: The workbench (1) is fixedly connected to four support legs (3) at the bottom corners.

5. A half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: Multiple placement boxes (15) are fixedly provided on the top of the workbench (1).

6. A half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: Multiple collection boxes (4) are fixedly installed on the top of the workbench (1).

7. A half-cell device for evaluating electrochemical performance according to claim 1, characterized in that: The heating base (33) and the connecting base (52) have two upper flow channels (2) inside, and the upper flow channels (2) are connected to the channel (34).

Images