CN113267680B - Proton exchange membrane conductivity test chamber and test method - Google Patents
Proton exchange membrane conductivity test chamber and test method Download PDFInfo
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- CN113267680B CN113267680B CN202110798133.8A CN202110798133A CN113267680B CN 113267680 B CN113267680 B CN 113267680B CN 202110798133 A CN202110798133 A CN 202110798133A CN 113267680 B CN113267680 B CN 113267680B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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Abstract
The invention discloses a proton exchange membrane conductivity test bin and a test method, wherein the test bin comprises a bin body and a test fixture, the test fixture comprises a first fixture, a second fixture, a guide rod, a mounting seat and a jacking assembly, the first fixture and the second fixture are both arranged in the bin body, the first fixture is provided with a first reference electrode and a first working electrode, the second fixture is provided with a second reference electrode and a second working electrode, the first reference electrode, the first working electrode, the second reference electrode and the second working electrode are suitable for being connected with an electrochemical workstation, the mounting seat is arranged on the bin wall of the bin body in a penetrating mode, the guide rod is connected between the first fixture and the mounting seat, the second fixture is arranged between the mounting seat and the first fixture and is assembled on the guide rod in a guiding and sliding mode, and the jacking assembly is arranged on the mounting seat in a penetrating mode and is adjustable in position along the extension direction of the guide rod. The proton exchange membrane conductivity test chamber disclosed by the invention is high in test precision, and can provide theoretical and data support for subsequent research and development and production of proton exchange membranes.
Description
Technical Field
The invention relates to the technical field of proton exchange membrane conductivity test, in particular to a proton exchange membrane conductivity test chamber and a proton exchange membrane conductivity test method based on the test chamber.
Background
A hydrogen fuel cell is a power generation device that directly converts chemical energy of hydrogen and oxygen into electrical energy. Proton exchange membranes are an important component of hydrogen fuel cells and play a critical role in the performance of hydrogen fuel cells. The conductivity, which is used for reflecting the ability of the proton exchange membrane to form current through a certain concentration of protons, is an important physical parameter of the proton exchange membrane.
The conductivity of the proton exchange membrane needs to be tested by a special test system, but in the related technology, the test precision of the proton exchange membrane of the test system is low, and the proton transfer capacity of the proton exchange membrane in the cross section direction cannot be effectively evaluated, so that the subsequent research and development and production of the proton exchange membrane lack powerful theoretical and data support.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides the proton exchange membrane conductivity test bin which is high in test precision and can provide theoretical and data support for the research and development and production of the subsequent proton exchange membrane.
The embodiment of the invention also provides a proton exchange membrane conductivity test method based on the proton exchange membrane conductivity test chamber.
The proton exchange membrane conductivity test chamber comprises: a bin body; the test fixture comprises a first fixture, a second fixture, a guide rod, a mounting seat and a jacking assembly, wherein the first fixture and the second fixture are arranged in the bin body, a first reference electrode and a first working electrode are arranged on the first fixture, a second reference electrode and a second working electrode are arranged on the second fixture, the first fixture and the second fixture are used for clamping a proton exchange membrane between the first reference electrode and the second working electrode, between the second reference electrode and the first working electrode, the first reference electrode, the first working electrode, the second reference electrode and the second working electrode are suitable for being connected with an electrochemical workstation, the mounting seat is arranged on the bin wall of the bin body in a penetrating manner, the guide rod is connected between the first fixture and the mounting seat, the second fixture is arranged between the mounting seat and the first fixture, and is assembled on the guide rod in a guiding sliding manner The jacking assembly penetrates through the mounting seat and is adjustable in position along the extending direction of the guide rod, and the jacking assembly is used for jacking the second clamp so that the first clamp and the second clamp the proton exchange membrane.
According to the proton exchange membrane conductivity test chamber disclosed by the embodiment of the invention, the test precision of the proton exchange membrane conductivity test chamber is high, and theoretical and data support can be provided for the research and development and production of a subsequent proton exchange membrane.
In some embodiments, the top pressure assembly includes a top rod, a pressure gauge, an adjusting seat, an elastic member and a fixing member, the adjusting seat is fitted in the mounting seat and adjustable in position along the extending direction of the guide rod, a mounting hole is formed in the adjusting seat, the mounting hole extends along the extending direction of the guide rod, one end of the top rod is fitted in the mounting hole and is movable along the mounting hole, the other end of the top rod penetrates through the mounting seat and is used for abutting against the second fixture, the elastic member is arranged in the mounting hole and one end of the elastic member abuts against the top rod, a probe of the pressure gauge is suitable for being inserted into the mounting hole and abutting against the other end of the elastic member, and the fixing member is used for fixing the pressure gauge and the adjusting seat.
In some embodiments, the adjustment seat is threadedly fitted within the mounting hole and the adjustment seat is helically movable adjustable along the extension direction of the mounting hole.
In some embodiments, the fixing member is screwed on the adjusting seat, and one end of the fixing member extends into the mounting hole and is used for abutting and matching with a probe of the pressure gauge.
In some embodiments, the guide rods comprise a first guide rod and a second guide rod, the first guide rod and the second guide rod are arranged in parallel and spaced, and the proton exchange membrane is placed between the first guide rod and the second guide rod.
In some embodiments, the first reference electrode and the second reference electrode are platinum columns, the first working electrode and the second working electrode are platinum sheets, the first working electrode and the second working electrode each have a coincident section and a non-coincident section, the coincident section of the first working electrode and the coincident section of the second working electrode overlap and coincide in the extending direction of the guide rod, the first reference electrode corresponds to the non-coincident section of the second working electrode, and the second reference electrode corresponds to the non-coincident section of the first working electrode.
In some embodiments, the cartridge body comprises a first cartridge body, a second cartridge body and a fastener, the cartridge body is formed by sealing and buckling the first cartridge body and the second cartridge body, one end of the fastener is connected with the first cartridge body, the other end of the fastener is connected with the second cartridge body, and the fastener is used for clamping and fixing the first cartridge body and the second cartridge body.
In some embodiments, the fastener includes a fastening bolt and a fastening nut, one end of the fastening bolt is connected with the first cartridge body, the other end of the fastening bolt passes through the second cartridge body, the fastening nut is screwed on the outer peripheral side of the fastening bolt, and the second cartridge body is clamped and fixed between the first cartridge body and the fastening nut.
In some embodiments, the first chamber body is provided with an air inlet hole which is suitable for being communicated with a humidity adjusting device, and the second chamber body is provided with an air outlet hole which is suitable for being connected with a pressure adjusting device.
The proton exchange membrane conductivity testing method comprises the following steps:
wiping the first working electrode and the second working electrode with alcohol;
after the alcohol volatilizes, smearing carbon conductive adhesive on the first working electrode and pasting a gas diffusion material on the first working electrode, smearing carbon conductive adhesive on the second working electrode and pasting the gas diffusion material on the second working electrode;
placing the cut proton exchange membrane between a first clamp and a second clamp, and enabling a first reference electrode, a first working electrode, a second reference electrode and a second working electrode to be located in the peripheral outline of the proton exchange membrane;
pressing the second clamp to enable the first clamp and the second clamp to pre-clamp the proton exchange membrane;
and adjusting the jacking assembly and enabling the jacking assembly to apply a set acting force to the second clamp so as to clamp and fix the proton exchange membrane.
Drawings
Fig. 1 is a schematic perspective view of the overall structure of a proton exchange membrane conductivity test chamber according to an embodiment of the present invention.
Figure 2 is a schematic cross-sectional view of the test cartridge of figure 1.
FIG. 3 is a schematic view of the proton exchange membrane arrangement of FIG. 2.
Reference numerals:
a test bin 1; a second cabin body 11; a first cartridge body 12; a guide rod 13; a mounting seat 14; an adjusting seat 15; a top bar 16; a fastening nut 17; a fastening bolt 18; a humidity sensor 19; a temperature adjustment device 110; an intake hole 111; an exhaust hole 112; a second clamp 113; a first clamp 114; a pressure gauge 115; an elastic member 116; a fixing member 117; a first reference electrode 118; a first working electrode 119; a second reference electrode 120; a second working electrode 121; a proton exchange membrane 122.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 3, a proton exchange membrane conductivity test chamber (hereinafter referred to as test chamber 1) according to an embodiment of the present invention includes a chamber body and a test fixture.
As shown in fig. 1 and 2, the cartridge body may be of a split design, that is, the cartridge body may be formed by hermetically splicing two parts, and an inner cavity of the cartridge body is used to provide a test environment for the conductivity test of the proton exchange membrane 122. It is understood that in some other embodiments, the cartridge body may be designed as an integral body, for example, a door or window structure may be provided on the cartridge body, so as to facilitate the insertion of the proton exchange membrane 122.
The test fixture comprises a first fixture 114, a second fixture 113, a guide rod 13, a mounting seat 14 and a jacking assembly, wherein the first fixture 114 and the second fixture 113 are both arranged in the bin body, the first fixture 114 is provided with a first reference electrode 118 and a first working electrode 119, the second fixture 113 is provided with a second reference electrode 120 and a second working electrode 121, the first fixture 114 and the second fixture 113 are used for clamping the proton exchange membrane 122 between the first reference electrode 118 and the second working electrode 121 and between the second reference electrode 120 and the first working electrode 119, the first reference electrode 118, the first working electrode 119, the second reference electrode 120 and the second working electrode 121 are suitable for being connected with an electrochemical workstation, the mounting seat 14 is arranged on the bin wall of the bin body in a penetrating manner, the guide rod 13 is connected between the first fixture 114 and the mounting seat 14, the second fixture 113 is arranged between the mounting seat 14 and the first fixture 114 and is assembled on the guide rod 13 in a guiding and sliding manner, the pressing assembly penetrates through the mounting base 14 and is adjustable along the extending direction of the guide rod 13, and the pressing assembly is used for pressing the second clamp 113 so that the first clamp 114 and the second clamp 113 clamp the proton exchange membrane 122.
Specifically, as shown in fig. 2, the mounting seat 14 of the test fixture is integrally arranged on the top wall of the bin body, one part of the mounting seat 14 is located at the outer side of the bin body, and the other part of the mounting seat 14 is located in the bin body. The first clamp 114 and the second clamp 113 are both arranged in the bin body, the first clamp 114 and the second clamp 113 are both substantially in a flat quadrangular shape, wherein the first clamp 114 is fixedly connected with the mounting seat 14 through the guide rod 13, the guide rod 13 can be provided with a plurality of guide rods, one end of each guide rod 13 is fixedly connected with the first clamp 114, and the other end of each guide rod 13 is fixedly connected with the bottom of the mounting seat 14. The guide rods 13 extend along the vertical direction, the second clamp 113 is provided with guide holes for the guide rods 13 to pass through, the second clamp 113 is arranged between the first clamp 114 and the mounting base 14 and can move up and down along the extending direction of the guide rods 13, and the proton exchange membrane 122 is placed between the first clamp 114 and the second clamp 113.
The jacking component can be a jacking rod, the jacking rod can be in threaded assembly with the mounting seat 14, and the bottom end of the jacking rod extends into the bin body. Therefore, when the ejector rod moves downwards, the ejector rod can stop against the second clamp 113, and the first clamp 114 and the second clamp 113 can be clamped and fixed by the ejection of the ejector rod, so that the proton exchange membrane 122 can be clamped and fixed.
As shown in fig. 3, a first working electrode 119 and a first reference electrode 118 are provided on the first holder 114, and a second working electrode 121 and a second reference electrode 120 are provided on the second holder 113. It should be noted that the first working electrode 119 and the second working electrode 121, and the first reference electrode 118 and the second reference electrode 120 are electrically connected by flexible wires, and then all the electrodes on the second clamp 113 are connected to the outside of the cartridge body by wires and connected to an impedance analyzer (electrochemical workstation). The first working electrode 119 and the second working electrode 121 are partially overlapped in the width direction, and the overlapping portion of the first working electrode 119 and the second working electrode 121 in the up-down direction is the effective area of the proton exchange membrane 122 for testing. In the present embodiment, first reference electrode 118 and second working electrode 121 face each other in the up-down direction, and second reference electrode 120 and first working electrode 119 face each other in the up-down direction.
It should be noted that, in order to ensure the sealing performance in the bin body, good sealing performance is required to be provided between the lead and the bin body and between the mounting seat 14 and the bin body.
According to the proton exchange membrane conductivity testing chamber provided by the embodiment of the invention, the testing clamp adopts a design idea of two electrodes and four ports, and in the testing process, the testing placement position of the proton exchange membrane 122 is consistent with the placement position of the proton exchange membrane 122 in actual use, so that the tested conductivity direction is the proton conduction direction when the battery actually works, and the influence of inductance effect caused by the thin membrane is effectively weakened. Therefore, the proton conduction direction of the fuel cell can be effectively simulated, the problem that the impedance test direction of the proton exchange membrane 122 is inconsistent with the actual proton transmission direction in the test chamber 1 adopting the plane test in the related technology is solved, particularly for the composite enhanced proton exchange membrane 122, the conductivity value of the composite enhanced proton exchange membrane 122 in the actual use direction can be effectively represented by adopting the test chamber 1 of the embodiment, further, the capability of the proton exchange membrane 122 in transmitting protons in the cross section direction can be evaluated, theoretical and data support is provided for the research and development and production of the subsequent proton membrane, and the test precision of the conductivity of the proton exchange membrane 122 is improved.
In addition, the test bin 1 of the embodiment requires a small amount of samples, so that the test cost can be effectively saved, the test efficiency is improved, and the error of a test system is reduced; compared with the single cell testing of the impedance of the proton exchange membrane 122, the testing chamber 1 can effectively remove the process of manufacturing the membrane electrode, greatly saves the testing time and improves the testing efficiency.
In some embodiments, the pressing component includes a top rod 16, a pressure gauge 115, an adjusting seat 15, an elastic member 116 and a fixing member 117, the adjusting seat 15 is fitted in the mounting seat 14 and is adjustable in position along the extending direction of the guide rod 13, a mounting hole is formed in the adjusting seat 15 and extends along the extending direction of the guide rod 13, one end of the top rod 16 is fitted in the mounting hole and is movable along the mounting hole, the other end of the top rod 16 passes through the mounting seat 14 and is used for abutting against the second clamp 113, the elastic member 116 is disposed in the mounting hole and one end of the elastic member 116 abuts against the top rod 16, a probe of the pressure gauge 115 is adapted to be inserted into the mounting hole and abuts against the other end of the elastic member 116, and the fixing member 117 is used for fixing the pressure gauge 115 and the adjusting seat 15.
Specifically, as shown in fig. 2, a threaded hole is formed in the mounting seat 14, the threaded hole extends in the up-down direction, the adjusting seat 15 is in threaded fit in the threaded hole, in this embodiment, the ejector rod 16, the elastic member 116, the pressure gauge 115, and the fixing member 117 are all disposed on the adjusting seat 15, a mounting hole is formed in the adjusting seat 15, the top end of the ejector rod 16 is fitted in the mounting hole, and the ejector rod 16 can move up and down in the mounting hole, it should be noted that the top end of the ejector rod 16 cannot be removed from the mounting hole, for example, a protrusion may be disposed on the periphery of the top end of the ejector rod 16, and a bottom end hole opening of the mounting hole may be blocked by the protrusion, so that the ejector rod 16 is prevented from being removed from the bottom end opening of the mounting hole.
The elastic member 116 may be a spring, the elastic member 116 is fitted in the mounting hole, and the elastic member 116 is located on the upper side of the jack 16. The manometer 115 has a probe (contact probe), and when installing manometer 115, insert manometer 115's probe in the mounting hole and make manometer 115's probe end with the top of elastic component 116, then can realize returning to zero the correction of manometer 115 through the position of adjusting manometer 115 from top to bottom, it needs to explain that, the setting of elastic component 116 makes manometer 115's probe can receive the effort to the correction of manometer 115 has been made things convenient for and has been returned to zero. After the pressure gauge 115 is calibrated to zero, the pressure gauge 115 and the adjusting seat 15 can be fixed through the fixing piece 117, the fixing piece 117 can be an annular plug, the fixing piece 117 can be sleeved on the outer periphery of the probe of the pressure gauge 115 and matched in the mounting hole, and after the pressure gauge 115 is calibrated to zero, the fixing piece 117 can be wedged between the probe and the mounting hole.
When first anchor clamps 114 and second anchor clamps 113 need to be pressed from both sides tightly, through rotatory regulation seat 15, adjust seat 15 and can reciprocate to can drive ejector pin 16 and reciprocate, the ejector pin 16 that moves can end on the upper surface of second anchor clamps 113, thereby can realize the tight fixed of clamp of first anchor clamps 114 and second anchor clamps 113. In addition, because the push rod 16 can move up and down in the mounting seat 14, the acting force exerted on the second clamp 113 by the push rod 16 can be transmitted to the pressure gauge 115 through the elastic piece 116, and the pressure gauge 115 can display the acting force between the push rod 16 and the second clamp 113, therefore, when a plurality of tests are required, the action exerted on the second clamp 113 every time can be consistent through the pressure gauge 115.
In some embodiments, the fixture 117 is threadably engaged to the adjustment seat 15, and one end of the fixture 117 extends into the mounting hole and is configured to stop engaging with a probe of the pressure gauge 115. Specifically, as shown in fig. 2, the fixing member 117 may be a jackscrew, the fixing member 117 is screwed on the adjusting seat 15, and the inner end of the fixing member 117 extends into the mounting hole, so that when the pressure gauge 115 is calibrated to zero, the fixing member 117 may be rotated to make the inner end of the fixing member 117 abut against the probe on the pressure gauge 115, thereby fixing the pressure gauge 115. The pressure gauge 115 is simple and convenient to fix and convenient to operate.
In some embodiments, the guide rods 13 include a first guide rod and a second guide rod, the first guide rod and the second guide rod are arranged in parallel and spaced apart, and the proton exchange membrane 122 is disposed between the first guide rod and the second guide rod. Specifically, as shown in fig. 2, the guide rods 13 may be arranged at intervals in the left-right direction, and a first clamp 114 portion and a second clamp 113 portion between the first guide rod and the second guide rod form a placing area for placing the proton exchange membrane 122. Therefore, the interference between the proton exchange membrane 122 and the first guide rod and the interference between the proton exchange membrane 122 and the second guide rod are avoided, and the proton exchange membrane 122 is convenient to place.
In some embodiments, first reference electrode 118 and second reference electrode 120 are platinum columns, first working electrode 119 and second working electrode 121 are platinum sheets, first working electrode 119 and second working electrode 121 each have a coincident section and a non-coincident section, the coincident section of first working electrode 119 is overlapped and coincident with the coincident section of second working electrode 121, first reference electrode 118 corresponds to the non-coincident section of second working electrode 121, and second reference electrode 120 corresponds to the non-coincident section of first working electrode 119 in the extending direction of guide bar 13.
Specifically, as shown in fig. 3, the first reference electrode 118 and the second reference electrode 120 are each an elongated cylindrical platinum column, and the first working electrode 119 and the second working electrode 121 may each be a rectangular platinum sheet. First working electrode 119 and second working electrode 121 have overlapping sections in the up-down direction, i.e., a right-side portion of first working electrode 119 and a left-side portion of second working electrode 121 are stacked together in the up-down direction. The portion of first working electrode 119 that is not stacked on top of second working electrode 121 forms a non-overlapping section of first working electrode 119, and the portion of second working electrode 121 that is not stacked on top of first working electrode 119 forms a non-overlapping section of second working electrode 121. First reference electrode 118 is positioned below the non-coincident segment of second working electrode 121 and second reference electrode 120 is positioned above the non-coincident segment of first working electrode 119.
The defects of the traditional method for measuring the membrane internal resistance by the four-electrode method and the conductivity of the fuel cell EIS are improved and combined, and the clamp adopts a design idea of adopting two electrodes and four ports, so that the measured conductivity direction is the proton conduction direction when the cell really works, and the accuracy of the test is further improved.
Preferably, the first clamp 114 and the second clamp 113 are each rectangular parallelepiped, and the length, width and height of the first clamp 114 and the second clamp 113 are 50 mm, 50 mm and 10 mm, respectively. The first reference electrode 118 and the second reference electrode 120 have a diameter of 2 mm. The contact area of the coincident segment of first working electrode 119 and second working electrode 121 may be 50 square millimeters.
In some embodiments, the storehouse body includes first storehouse body 12, second storehouse body 11 and fastener, the storehouse body is formed through the sealed lock of first storehouse body 12 and second storehouse body 11, the one end of fastener links to each other with first storehouse body 12, the other end of fastener links to each other with second storehouse body 11, the fastener is used for pressing from both sides first storehouse body 12 and second storehouse body 11 tight fixed, the fastener includes fastening bolt 18 and fastening nut 17, fastening bolt 18's one end links to each other with first storehouse body 12, fastening bolt 18's the other end passes second storehouse body 11, fastening nut 17 screw-thread fit is at the periphery side of fastening bolt 18, second storehouse body 11 presss from both sides tightly to be fixed between first storehouse body 12 and fastening nut 17.
Specifically, as shown in fig. 1, the bin bodies are arranged in a split manner, and each bin body comprises a first bin body 12 and a second bin body 11 which are arranged up and down, wherein each of the first bin body 12 and the second bin body 11 is in a square box shape, and openings of the first bin body 12 and the second bin body 11 are opposite. The fastener is equipped with four, four fasteners are established respectively in four corner positions of the storehouse body department, the bottom of the fastening bolt 18 of four fasteners all with four corner position welded fastening of the first storehouse body 12, first storehouse body 12 is all passed on the top of four fastening bolt 18, the equal screw thread in top of every fastening bolt 18 is equipped with fastening nut 17, four fastening nut 17 all are located the upside of the second storehouse body 11, from this, can press from both sides first storehouse body 12 and second storehouse body 11 tightly fixedly through revolving four fastening nut 17. Thereby facilitating the placement and removal of the proton exchange membrane 122.
It is noted that the spacing between the first clamp 114 and the top wall of the cartridge body is less than the height of the cartridge body, as shown in fig. 2. Thereby avoiding the situation that the first clamp 114 touches the bottom wall of the cartridge body.
In some embodiments, the first chamber body 12 is provided with an air inlet hole 111, the air inlet hole 111 is suitable for communicating with a humidity adjusting device, the second chamber body 11 is provided with an air outlet hole 112, and the air outlet hole 112 is suitable for connecting with a pressure adjusting device.
Specifically, as shown in fig. 1, the air inlet holes 111 are formed on the first bin body 12, and the air outlet holes 112 are formed on the second bin body 11, so as to facilitate the discharge and intake of air in the bin body. In addition, the humidity adjusting device can adjust the humidity in the bin body, and the pressure adjusting device can adjust the pressure in the bin body. Therefore, the conductivity of the proton exchange membrane 122 under different environments can be tested.
In some embodiments, as shown in fig. 1, a humidity sensor 19 and a temperature adjusting device 110 are further disposed in the bin body, the temperature sensor is suitable for cooperating with the humidity adjusting device, and the temperature adjusting device 110 (thermocouple) can realize automatic adjustment of the temperature in the bin body.
The following describes a method for testing the conductivity of the proton exchange membrane 122 according to an embodiment of the present invention.
The method for testing the conductivity of the proton exchange membrane 122 according to the embodiment of the invention comprises the following steps:
the first working electrode 119 and the second working electrode 121 are wiped with alcohol.
Specifically, the surfaces of first working electrode 119 and second working electrode 121 may be wiped with a disposable cotton swab dipping in 95% ethanol, thereby making the surfaces of first working electrode 119 and second working electrode 121 clean and free of impurities. Thus, the test accuracy can be improved. The first reference electrode 118 and the second reference electrode 120 may be wiped with alcohol.
After the alcohol is volatilized, the first working electrode 119 is coated with a carbon conductive adhesive and the first working electrode 119 is pasted with a gas diffusion material, and the second working electrode 121 is coated with a carbon conductive adhesive and the second working electrode 121 is pasted with a gas diffusion material.
Specifically, after the alcohol on first working electrode 119, second working electrode 121, first reference electrode 118, and second reference electrode 120 is completely volatilized, SPI carbon conductive adhesive may be coated on first working electrode 119, and then a layer of gas diffusion material may be adhered on first working electrode 119, where the gas diffusion material may be carbon fiber paper, carbon fiber woven fabric, non-woven fabric, carbon black paper, and the like, and preferably, the gas diffusion material is GDL. Thereby, the test of the proton exchange membrane 122 is made to be closer to the actual operation state of the fuel cell.
The cut proton exchange membrane 122 is placed between first clamp 114 and second clamp 113 such that first reference electrode 118, first working electrode 119, second reference electrode 120, and second working electrode 121 are within the outer perimeter of proton exchange membrane 122.
Specifically, the proton exchange membrane 122 is first cut to a corresponding size with reference to the corresponding sizes of the first clamp 114, the second clamp 113, the first working electrode 119, and the second working electrode 121. Proton exchange membrane 122 is then placed between first clamp 114 and second clamp 113, and first reference electrode 118, first working electrode 119, second reference electrode 120, and second working electrode 121 are located within the boundary of the outer perimeter of proton exchange membrane 122 in the up-down direction. Therefore, the proton exchange membrane 122 can completely cover all the electrodes and have a certain margin, and the accuracy of the test is ensured.
The second clamp 113 is pressed so that the first clamp 114 and the second clamp 113 pre-clamp the proton exchange membrane 122. Specifically, the second clamp 113 may be lightly pressed by a finger, so that the proton exchange membrane 122 is preliminarily clamped and fixed between the first clamp 114 and the second clamp 113.
The pressing assembly is adjusted and applies a predetermined force to the second fixture 113 to clamp and fix the proton exchange membrane 122. Specifically, the position of the pressing assembly is adjusted, and the pressing assembly is in pressing contact with the second fixture 113, so that the proton exchange membrane 122 is clamped and fixed, and the set acting force is the acting force exerted by the pressing assembly on the second fixture 113, so that the acting force exerted in each test is consistent, and the measurement error is reduced.
In some embodiments, the electrode leads are sequentially connected to the electrochemical workstation, the humidity sensor 19 and the temperature adjustment device 110 are electrically connected to the PC terminal, then the ambient nitrogen is introduced from the air inlet 111, the humidity in the chamber is controlled by real-time data provided by the high-precision humidity sensor 19 to maintain the humidity in the chamber constant, and the temperature is controlled by the temperature adjustment device 110 to control the temperature in the chamber constant. The exhaust hole 112 is an atmosphere outlet and is connected with a backpressure valve. And finally, connecting the electrochemical workstation with a PC terminal, testing impedance by using corresponding software and converting the impedance into the penetration conductivity. Under the testing method of the membrane testing system, the penetrating conductivity sigma is determined by penetrating internal resistance R < quadrature > (omega), membrane thickness L (cm) and effective area 0.5 square centimeter of conductivity test:
taking the gol 18 membrane (proton exchange membrane 122) as an example, the internal resistance of the gol 18 membrane finally tested and fitted is shown in table 1.
TABLE 1 impedance test results
As can be known from the above table, by using the test chamber 1 and the corresponding test method of the present embodiment, the measurement result of the proton exchange membrane 122 and the data given by the authority have a higher coincidence degree, and the test chamber 1 and the corresponding test method of the present embodiment have a higher measurement accuracy for the conductivity of the proton exchange membrane 122.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A proton exchange membrane conductivity test chamber, comprising:
a bin body;
the test fixture comprises a first fixture, a second fixture, a guide rod, a mounting seat and a jacking assembly, wherein the first fixture and the second fixture are arranged in the bin body, a first reference electrode and a first working electrode are arranged on the first fixture, a second reference electrode and a second working electrode are arranged on the second fixture, the first fixture and the second fixture are used for clamping a proton exchange membrane between the first reference electrode and the second working electrode, between the second reference electrode and the first working electrode, the first reference electrode, the first working electrode, the second reference electrode and the second working electrode are suitable for being connected with an electrochemical workstation, the mounting seat is arranged on the bin wall of the bin body in a penetrating manner, the guide rod is connected between the first fixture and the mounting seat, the second fixture is arranged between the mounting seat and the first fixture, and is assembled on the guide rod in a guiding sliding manner The jacking assembly is arranged on the mounting seat in a penetrating manner and is adjustable along the extending direction of the guide rod, the jacking assembly is used for jacking the second clamp so as to enable the first clamp and the second clamp to clamp the proton exchange membrane,
the first working electrode and the second working electrode are provided with a coincident section and a non-coincident section, in the extending direction of the guide rod, the coincident section of the first working electrode is overlapped with the coincident section of the second working electrode, the first reference electrode corresponds to the non-coincident section of the second working electrode, and the second reference electrode corresponds to the non-coincident section of the first working electrode.
2. The proton exchange membrane conductivity test chamber according to claim 1, wherein the pressing assembly comprises a top rod, a pressure gauge, an adjusting seat, an elastic member and a fixing member, the adjusting seat is matched in the mounting seat and is adjustable in position along the extending direction of the guide rod, the adjusting seat is internally provided with a mounting hole which extends along the extending direction of the guide rod, one end of the ejector rod is matched in the mounting hole and can move along the mounting hole, the other end of the ejector rod penetrates through the mounting seat and is used for stopping the second clamp, the elastic component is arranged in the mounting hole, one end of the elastic component is abutted to the ejector rod, a probe of the pressure gauge is suitable for being inserted into the mounting hole and abutted to the other end of the elastic component, and the fixing component is used for fixing the pressure gauge and the adjusting seat.
3. The proton exchange membrane conductivity test cartridge of claim 2, wherein the adjustment seat is threadably engaged within the mounting hole and is helically movable adjustable along an extension direction of the mounting hole.
4. The proton exchange membrane conductivity test chamber of claim 2, wherein the fixing member is screwed on the adjusting seat, and one end of the fixing member extends into the mounting hole and is used for abutting engagement with a probe of the pressure gauge.
5. The proton exchange membrane conductivity test compartment of claim 1, wherein the guide bar comprises a first guide bar and a second guide bar, the first guide bar and the second guide bar are arranged in parallel and spaced apart, and the proton exchange membrane is disposed between the first guide bar and the second guide bar.
6. The proton exchange membrane conductivity test cartridge of claim 1, wherein the first and second reference electrodes are platinum posts and the first and second working electrodes are platinum sheets.
7. The proton exchange membrane conductivity test cartridge of any one of claims 1 to 6, wherein said cartridge body comprises a first cartridge body, a second cartridge body, and a fastener, wherein said cartridge body is formed by sealing and fastening said first cartridge body and said second cartridge body, one end of said fastener is connected to said first cartridge body, the other end of said fastener is connected to said second cartridge body, and said fastener is used for clamping and fixing said first cartridge body and said second cartridge body.
8. The proton exchange membrane conductivity testing cartridge according to claim 7, wherein the fastening member comprises a fastening bolt and a fastening nut, one end of the fastening bolt is connected to the first cartridge body, the other end of the fastening bolt passes through the second cartridge body, the fastening nut is in threaded fit with an outer peripheral side of the fastening bolt, and the second cartridge body is clamped and fixed between the first cartridge body and the fastening nut.
9. The proton exchange membrane conductivity testing chamber of claim 7, wherein the first chamber body is provided with an air inlet hole, the air inlet hole is suitable for being communicated with a humidity adjusting device, the second chamber body is provided with an air outlet hole, and the air outlet hole is suitable for being connected with a pressure adjusting device.
10. A proton exchange membrane conductivity test method of the proton exchange membrane conductivity test chamber according to any one of claims 1 to 9, comprising the steps of:
wiping the first working electrode and the second working electrode with alcohol;
after the alcohol volatilizes, smearing carbon conductive adhesive on the first working electrode and pasting a gas diffusion material on the first working electrode, smearing carbon conductive adhesive on the second working electrode and pasting the gas diffusion material on the second working electrode;
placing the cut proton exchange membrane between a first clamp and a second clamp, and enabling a first reference electrode, a first working electrode, a second reference electrode and a second working electrode to be located in the peripheral outline of the proton exchange membrane;
pressing the second clamp to enable the first clamp and the second clamp to pre-clamp the proton exchange membrane;
and adjusting the jacking assembly and enabling the jacking assembly to apply a set acting force to the second clamp so as to clamp and fix the proton exchange membrane.
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