CN213275763U - Device for measuring conductivity of proton conducting membrane in thickness direction - Google Patents
Device for measuring conductivity of proton conducting membrane in thickness direction Download PDFInfo
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Abstract
The utility model provides a measure thick direction conductivity device of proton conduction membrane belongs to fuel cell test technical field, including insulating base, be equipped with braced frame on the insulating base, the braced frame top is equipped with the baffle, and the baffle center is equipped with linear bearing, and needle type electrode shaft perpendicular to insulating base motion under the restriction of linear bearing, the top of needle type electrode baffle top is equipped with the weight platform, the bottom of needle type electrode baffle below is equipped with conical electrode, is equipped with the pressure plate of passing through on the insulating base of conical electrode below, be equipped with the cylinder electrode on the pressure plate below insulating base, laid the proton conduction membrane between cylinder electrode and the pressure plate, conical electrode can reciprocate perpendicularly above the pressure plate of passing through and fasten the proton conduction membrane. The utility model discloses be provided with the weight platform, through the contact condition of adjusting the electrode that the weight can accurate control diaphragm and both ends, the contact resistance error of electrode and membrane when reducing a lot of measurements guarantees the test relative accuracy.
Description
Technical Field
The utility model belongs to the technical field of fuel cell testing arrangement, concretely relates to measure thick direction conductivity device of proton conduction membrane.
Background
In the measurement of the conductivity of the proton conductive membrane of the fuel cell in the thickness direction, a linearly changing direct current voltage is applied to the membrane, the current passing through the thin membrane of the proton conductive membrane is measured, and the conductivity of the membrane is calculated by ohm's law. The phenomenon of double layer polarization of the electrode and the film has a large effect on the resistance of the film in a direct current test, and the problem of polarization is complex and is not only related to the applied direct current voltage, but also related to the electrode material, shape and flatness. That is, for the solid electrolyte such as proton conducting membrane, if an electric field voltage is applied, the internal protons H + will move to the cathode to form a current in the proton conducting membrane, but at the same time, the anions in the proton conducting membrane, such as SO32 ", are fixed on the proton conducting membrane polymer chains and cannot move, and at the same time, no protons are supplemented, SO that a reverse potential, i.e., a polarization potential, is formed in the proton conducting membrane, which will cause the ammeter to decay rapidly. Therefore, the measurement of the resistivity of the proton conduction membrane in the membrane thickness direction is difficult, the conductivity of the membrane is difficult to measure under certain precision through the traditional ohm law, the preparation method of the sample to be measured is complicated, and the batch verification of the conductivity of the proton conduction membrane in the membrane thickness direction of the fuel cell in the production process is difficult to realize.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a measure thick direction conductivity device of proton conduction membrane.
For solving the technical problem, the utility model provides a measure thick direction conductivity device of proton conduction membrane, including insulating base, be equipped with braced frame on the insulating base, the braced frame top is equipped with the baffle, the baffle center is equipped with linear bearing, and needle type electrode shaft perpendicular to insulating base motion under the linear bearing restraint, the top of needle type electrode baffle top is equipped with the weight platform, the bottom of needle type electrode baffle below is equipped with conical electrode, be equipped with the clamp plate on the insulating base of conical electrode below, be equipped with the cylinder electrode on the clamp plate below insulating base, the proton conduction membrane has been laid between cylinder electrode and the clamp plate, the conical electrode can reciprocate perpendicularly above the clamp plate and fasten the proton conduction membrane.
As a preferable scheme, the conical electrode comprises a conical body, a circular hole with the diameter of 0.8-1 mm is formed in the conical body, and a lead I penetrates through and is fixed in the circular hole along the direction of a central line to form the electrode;
the conical electrode and the needle-shaped electrode shaft move perpendicular to the insulating base under the restraint of the linear bearing, the distance from the surface of the cylindrical electrode to the surface of the cylindrical electrode is 100mm when the needle-shaped electrode shaft moves to the highest point, and the conical electrode, the proton conducting membrane and the cylindrical electrode are clamped to form an electrochemical system electrode when the needle-shaped electrode shaft moves to the lowest point.
As a preferable scheme, the cylindrical electrode comprises a groove arranged on the insulating base, and the groove is in a cylindrical shape with the depth of 2mm and the diameter of 2 mm; and a lead II and an electrode end thereof are embedded in the groove, the center of the electrode end face of the lead II is vertically aligned with the electrode end face of the lead I after the installation is finished, and the other ends of the lead I and the lead II are connected with an electrochemical workstation.
As a preferable scheme, the transparent pressing plate is in a cuboid shape, a conical groove is formed in the center of the transparent pressing plate, vertical ventilating through holes are formed in a conical inclined plane of the conical groove, the diameter of each through hole is smaller than 2mm, and the number of the through holes is smaller than 30; the conical inclined plane of the pressure transmission plate is consistent with the conical taper of the conical body.
As a preferable scheme, positioning holes are formed in the edges of the periphery of the transparent pressing plate, holes corresponding to the positioning holes are formed in the insulating base, and the diameter of each hole is larger than the diameter of each fastening bolt by 1 mm; the relative position deviation between the positioning hole and the opening on the insulating base is not more than 1 mm.
As a preferred scheme, locating slots are arranged on two sides of the transparent pressing plate, locating blocks corresponding to the locating slots are arranged on the insulating base, and the transparent pressing plate and the insulating base are fixed through fastening bolts.
The needle-shaped electrode shaft, the cylindrical electrode, the transparent pressing plate and the insulating base are made of polyether-ether-ketone, polytetrafluoroethylene or PET polymer non-conductive materials;
the lead I and the lead II are made of platinum, gold-plated copper and silver with low resistivity;
the volume resistivity of the non-conductive material is 900-1100 omega cm.
The utility model discloses beneficial effect:
the utility model discloses a weight accurate control can the accurate contact condition of the electrode at membrane rather than both ends of controlling the weight, electrode and membrane contact resistance error when reducing a lot of measurements, guarantees the test relative accuracy to simplified measurement method, ensured the batch examination of the thick direction conductivity of fuel cell proton conduction membrane in the production process. The device is provided with a weight table.
Drawings
FIG. 1: the utility model discloses a schematic diagram of a device for testing the conductivity of a proton conducting membrane in the thickness direction;
FIG. 2: the utility model discloses a schematic diagram of a cone-shaped electrode of a proton conducting membrane thickness direction conductivity testing device;
FIG. 3: the utility model discloses a schematic diagram of a permeable plate of a proton conducting membrane thickness direction conductivity testing device;
FIG. 4: the utility model discloses a cylindrical electrode schematic diagram of a proton conducting membrane thickness direction conductivity testing device;
FIG. 5: the utility model discloses an equivalent circuit model for proton conduction membrane measurement;
FIG. 6: the utility model discloses embodiment 2 resistance temperature and humidity characteristic curve;
FIG. 7: the utility model discloses embodiment 3 resistance temperature and humidity characteristic curve;
wherein; 1. a weight table; 2. a needle-shaped electrode shaft; 3. a tapered electrode; 4. a wire I; 5. a pressure-permeable plate; 6. a proton conducting membrane; 7. a wire II; 8. opening a hole; 9. a through hole; 10. positioning a groove; 11. positioning blocks; 12. an insulating base; 13. a duct; 14. and (7) positioning the holes.
Detailed Description
In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making an innovative effort, shall fall within the scope of protection of the present application.
Example 1:
referring to the attached drawings, the utility model provides a device for measuring the conductivity of a proton conducting membrane in the thickness direction, which comprises an insulating base 12, a supporting frame is arranged on the insulating base 12, a baffle plate is arranged above the supporting frame, a linear bearing is arranged in the center of the baffle plate, the needle-shaped electrode shaft 2 moves perpendicular to the insulating base 12 under the restriction of the linear bearing, the top end of the needle-shaped electrode shaft 2 above the baffle is provided with a weight table 1, the bottom of the needle-shaped electrode shaft 2 below the baffle is provided with a conical electrode 3, a transparent pressing plate 5 is arranged on an insulating base 12 below the conical electrode 3, a cylindrical electrode is arranged on the insulating base 12 below the transparent pressing plate 5, and a proton conducting membrane 6 is laid between the cylindrical electrode and the transparent pressing plate 5, and the conical electrode 3 can vertically move up and down above the transparent pressing plate 5 to fasten the proton conducting membrane 6.
The conical electrode 3 comprises a conical body, a circular hole 13 with the diameter of 0.8-1 mm is formed in the conical body, and a lead I4 penetrates through and is fixed in the circular hole 13 along the central line direction to form an electrode;
the conical electrode 3 and the needle-shaped electrode shaft 2 move perpendicular to the insulating base 12 under the restraint of a linear bearing, the distance from the surface of the cylindrical electrode to the surface of the cylindrical electrode is 100mm when the needle-shaped electrode shaft 2 moves to the highest point, and the conical electrode 3, the proton conducting membrane 6 and the cylindrical electrode are clamped to form an electrochemical system electrode when the needle-shaped electrode shaft 2 moves to the lowest point.
The cylindrical electrode comprises a groove arranged on the insulating base 12, and the groove is cylindrical with the depth of 2mm and the diameter of 2 mm; and a lead II7 and an electrode end thereof are embedded in the groove, the center of the end face of the electrode end of the lead II7 is vertically aligned with the end face of the electrode end of the lead I4 after the installation is finished, and the other ends of the lead I4 and the lead II7 are connected with an electrochemical workstation.
The transparent pressing plate 5 is cuboid in shape, a conical groove is formed in the center of the transparent pressing plate 5, vertical ventilating through holes 9 are formed in the conical inclined plane of the conical groove, the diameter of each through hole 9 is smaller than 2mm, and the number of the through holes 9 is smaller than 30; the conical inclined plane of the transparent pressing plate 5 is consistent with the conical taper of the conical body.
Positioning holes 14 are formed in the peripheral edge of the transparent pressing plate 5, an opening 8 corresponding to the positioning holes 14 is formed in the insulating base 12, and the diameter of the opening 8 is larger than that of the fastening bolt by 1 mm; the relative position deviation between the positioning hole 14 and the opening 8 on the insulating base 12 is not more than 1 mm.
Positioning grooves 10 are formed in two sides of the transparent pressing plate 5, positioning blocks 11 corresponding to the positioning grooves 10 are arranged on the insulating base 12, and the transparent pressing plate 5 and the insulating base 12 are fixed through fastening bolts.
The needle-shaped electrode shaft 2, the cylindrical electrode, the permeable plate 5 and the insulating base 12 are made of non-conductive materials such as polyether-ether-ketone, polytetrafluoroethylene or PET polymer;
the lead I4 and the lead II7 are made of platinum, gold-plated copper and silver with low resistivity;
the volume resistivity of the non-conductive material is 900-1100 omega cm.
Weights with different masses can be placed on the weight table 1, and the contact state of the proton conduction membrane 6 and the electrodes at the two ends of the proton conduction membrane can be accurately controlled by adjusting the mass of the weights; the weight table 1 part is connected with the needle-shaped electrode shaft 2; a lead wire I4 is placed in the pore canal 13, and one end of the lead wire I4 is polished to be flat and used as an electrode end and is contacted with the upper surface of the proton conducting membrane 6. The cylindrical electrode of the lead I4 is used as an electrode end, is vertically aligned with the end face of the conical electrode 3, and is contacted and fastened with the upper surface and the lower surface of the proton conducting membrane 6. The other ends of the lead I4 and the lead II7 are connected with an electrochemical workstation;
the proton conduction membrane 6 can be directly communicated with the box body environment of the program-controlled constant temperature and humidity instrument through the through hole 9, so that the temperature and humidity environment on the surface of the proton conduction membrane 6 is consistent with the outside. The two sides of the transparent pressing plate 5 are provided with positioning grooves 10, so that the positioning is accurate, the connection is reliable, and the function of fixing the film to be detected can be achieved.
A method for providing a device for measuring the conductivity of a proton conducting membrane in the thickness direction is provided, wherein the equivalent circuit calculation adopts a model shown in figure 5: wherein R isΩThe ohmic resistance of the film, or called internal resistance;
Rpthe electrochemical reaction resistance, in this case the sum of the polarization resistance, the interface impedance and the Weber impedance;
CP-double layer capacitance of the membrane to metal platinum interface;
the proton conduction membrane adopted by the method for measuring the complex impedance of the equivalent circuit model is as follows:
the real part of the complex model is:
the complex model imaginary part is:
for any one
The values, each having a respective Z' and Z ", are represented in the complex impedance plane as a point connecting each of the values
The impedance point of (2) is a curve obtained in the complex plane, which is called a complex impedance curve.
When in use
When the resistance R of the film is formed, the intersection point of the semicircle and the Z' axisΩ(ii) a When in use
And the intersection point of the semicircle and the Z' axis is Re + Rp. When in use
The electrical double layer capacitance Cp of the electrode/membrane can be found according to the formula for the angular frequency of the highest point of the semicircle. Then according to RΩAnd the areas of the electrode ends of the first lead wire 4 and the second lead wire 7, the conductivity of the film is calculated as follows:
in the formula, the S electrode is the area of the end face of the upper conical electrode 3 (or the electrode end of the lead 7), and d is the thickness of the film to be measured. The measuring method specifically comprises the following steps:
A. selecting electrodes meeting the standard, a lead I4, a lead II7 and a proton conducting membrane 6 sample sheet;
B. the weight table 1 is lifted upwards through the needle-shaped electrode shaft 2, the fastening screws of the pressure-permeable plate 5 and the insulating base 12 are loosened, and the pressure-permeable plate 5 is taken down.
C. Spreading the proton conducting membrane 6 to be tested on the insulating base 12 to completely cover the electrode of the lead II7 on the insulating base 12, flatly pressing the pressure-permeable plate 5 with the air-permeable through hole 9 on the proton conducting membrane 6 to be tested, and slowly dropping the needle-shaped electrode shaft 2 lined with the lead I4 and lightly pressing the needle-shaped electrode shaft on the film to be tested;
D. a weight with the mass of 80g is placed on the weight table 1 on the needle-shaped electrode shaft 2, the mass of the weight pressurizes the needle-shaped electrode shaft 2, and the electrode end plane of the lead I4 and the electrode end plane of the lead II7 are ensured to be stacked together with the proton conducting membrane 6 to be tested between the two, and the proton conducting membrane 6 to be tested has no folds.
E. Placing the testing device with the proton conducting membrane 6 in a constant temperature and humidity box, clamping a lead I4 and a lead II7 by metal clamps in the constant temperature and humidity box respectively, and connecting an electrode of an electrochemical workstation with a power supply connection outside the constant temperature and humidity box; starting an alternating current impedance test program, measuring and reading an impedance value and calculating the conductivity.
Wherein the cone-shaped electrode 3 vertically moves up and down above the cylindrical electrode to fasten the proton conducting membrane 6. The contact state of the electrode and the proton conducting membrane 6 can be accurately controlled by adding the weight on the weight table 1, and uncertainty and instability of influence factors such as contact resistance, capacitance resistance of an electric double layer of the electrode and the proton conducting membrane 6 and the like during measurement are reduced; the insulating high-frequency low-dielectric material can play an insulating effect, a non-test area of a sample to be tested does not need to be subjected to insulating treatment, and the influence of electrochemical impedance and capacitive reactance of equipment in a test can be ignored due to the extremely low dielectric constant. Through the high-precision electrochemical workstation, voltage and current data in a test loop can be accurately tested, and the accuracy of a test result is improved. Alternating current is applied to the proton conduction membrane 6 through the inert electrodes on the two sides, an alternating current impedance spectrogram is drawn, the spectrogram is analyzed to obtain the transverse resistance of the fuel cell membrane, and the conductivity of the proton conduction membrane 6 in the membrane thickness direction is further calculated through the effective areas of the membrane and the inert electrodes and the thickness of the membrane to be measured.
The step A specifically comprises the following steps: a, measuring the areas S1 and S2 of the electrode end of the lead wire I4 and the electrode end of the lead wire II7, so that S1-S2 is less than 0.005S 1;
b, placing the electrode end of the lead I4 and the electrode end of the lead II7 in a 5% dilute nitric acid solution for soaking for 24 hours to remove organic stains or impurity metal particles on the surface of the electrode;
c, setting parameters of the constant temperature and humidity box to be in an environmental condition of a certain temperature and humidity, and standing for 2 hours;
d, selecting the proton conducting membrane 6 to be tested, cutting the proton conducting membrane into sample pieces, wherein the sample pieces are smaller than the transparent pressing plate 5 on the device, and the length and the width of the sample pieces are respectively smaller than 5mm of the length and the width of the transparent pressing plate 5, so that the proton conducting membrane 6 is ensured not to be damaged by the fixing screws of the insulating base 12.
The step E specifically comprises the steps of measuring an impedance map of the proton conducting membrane 6 applied between the conical electrode 3 and the cylindrical electrode in the frequency range of 1-10MHz and the small-amplitude sine wave disturbance potential amplitude of 100mV through an electrochemical workstation, and calculating the conductivity of the proton conducting membrane 6 of the fuel cell membrane in the membrane thickness direction according to an equivalent circuit and a conductivity formula; the contact pressure of the conical electrode 3 is changed by adjusting the weight and the number of the weights on the weight tray 1, so that the influence of contact resistance on a measurement result is reduced; and the electrode end of the lead I4 and the electrode end of the wire II7 are polished on polishing cloth by 0.05 mu m alpha-Al 2O3 and are sequentially subjected to ultrasonic treatment in acetone and water for 10-100min to ensure the contact state of the electrodes and the film to be detected.
Example 2:
detection preparation: and measuring the areas S1 and S2 of the electrode end of the lead I4 and the electrode end of the lead II7, calculating the difference value of the two, wherein the difference value (S1-S2) is less than 0.005S1, and if the difference value is too large, processing the larger electrode end until the requirements are met. Meanwhile, the surface smoothness of the electrode end of the lead I4 and the electrode end of the lead II7 is checked, and the end faces are smooth and have no protruding points or recessed points.
Checking the surface integrity of the film to be detected, observing under natural light or fluorescent lamp or magnifying glass by means of a magnifying device, if obvious defects (wrinkles, stains, pinholes and creases) are found in the appearance, abandoning the film and preparing a sample by taking the sample to be detected again.
Pretreatment of the platinum electrode: before testing, the electrode terminal of the lead I4 and the electrode terminal of the lead II7 are soaked in a 5% dilute nitric acid solution for 24 hours to remove organic stains or impurity metal particles on the surface of the electrodes. The parameters of the constant temperature and humidity chamber are set as follows: the temperature is 30 ℃, the relative humidity is 20% RH, 40% RH, 60% RH, 80% RH, and 90% temperature and humidity environment, standing is carried out for 2h, so that the proton conduction membrane 6 is fully swelled, and then the thickness is measured by using a thickness gauge.
The proton conducting membrane 6 to be tested is selected and cut into sample pieces, and the sample pieces are smaller than the area of the device pressure transmission plate 5 (the length and the width are respectively smaller than 5mm of the length and the width of the pressure transmission plate), so that the proton conducting membrane 6 is ensured not to be damaged by the fixing screws on the device insulation base 12. The weight table 1 is lifted up through the needle-shaped electrode shaft 2, then the fastening screws of the insulating transparent pressing plate 5 and the insulating base 12 are loosened, and the transparent pressing plate 5 is taken down.
The film to be measured is flatly laid on the insulating base 12 to completely cover the electrode of the lead II7 on the insulating base 12, then the pressure-permeable plate 5 with the air-permeable through hole 9 is flatly pressed on the film to be measured, and the needle-shaped electrode shaft 2 lined with the lead I4 slowly falls down and is lightly pressed on the film to be measured. A weight with the mass of 80g is placed on the weight table 1 on the needle-shaped electrode shaft 2, the weight presses the needle-shaped electrode shaft 2, and the electrode end plane of the lead I4 and the electrode end plane of the lead II7 are stacked together with the film to be detected between the electrode end plane and the lead II7, so that the film to be detected is not wrinkled.
The device with the film installed is placed in a constant temperature and humidity box, a lead I4 and a lead II7 are respectively clamped by metal clamps inside the device, and then electrodes of the electrochemical workstation are connected with power supply wiring outside the constant temperature and humidity box (a red connector is inserted into a green electrode wiring terminal, and a black connector is inserted into a blue electrode wiring terminal). Starting an alternating current impedance test program, measuring and reading an impedance value and calculating the conductivity. From the read resistance value, the conductivity calculation formula is substituted:
k membrane conductivity (mS/cm)
d: thickness of the film
RΩ+Rp: measured impedance value (k.OMEGA.) of the sample
SElectrode for electrochemical cell: end area S1 of electrode end of lead I4 or end area S2 of electrode end of lead II7
Starting an alternating-current impedance test program for measurement, finishing the test, deriving measurement data in the electrochemical workstation, inputting the measurement data into origin data processing software to make a vertical resistance temperature and humidity characteristic curve as shown in fig. 6.
Example 3:
example 3 differs from example 2 in that: the temperature of the constant temperature and humidity chamber in the steps in the example is set to 80 ℃, the relative humidity is respectively the temperature and humidity environment of 20% RH, 40% RH, 60% RH, 80% RH, 90%, the electrical conductivity is measured and calculated, and the temperature and humidity electrical conductivity characteristic curve at 80 ℃ is drawn as shown in fig. 7.
Claims (7)
1. A device for measuring the conductivity of a proton conduction membrane in the thickness direction is characterized by comprising an insulating base (12), a supporting frame is arranged on the insulating base (12), a baffle plate is arranged above the supporting frame, the center of the baffle is provided with a linear bearing, the needle-shaped electrode shaft (2) moves vertical to the insulating base (12) under the restriction of the linear bearing, a weight table (1) is arranged at the top end of the needle-shaped electrode shaft (2) above the baffle, the bottom of the needle-shaped electrode shaft (2) below the baffle is provided with a conical electrode (3), a transparent pressing plate (5) is arranged on the insulating base (12) below the conical electrode (3), a cylindrical electrode is arranged on the insulating base (12) below the transparent pressing plate (5), a proton conducting membrane (6) is laid between the cylindrical electrode and the pressure permeable plate (5), the conical electrode (3) can vertically move up and down above the pressure transmission plate (5) to fasten the proton conduction membrane (6).
2. The device for measuring the thickness direction conductivity of the proton conducting membrane according to claim 1, wherein the tapered electrode (3) comprises a conical body, a circular pore channel (13) with the diameter of 0.8-1 mm is arranged in the conical body, and the lead I (4) penetrates through and is fixed in the circular pore channel (13) along the direction of a central line to form the electrode;
the conical electrode (3) and the needle-shaped electrode shaft (2) move perpendicular to the insulating base (12) under the restraint of a linear bearing, the height from the surface of the cylindrical electrode is 100mm when the needle-shaped electrode shaft (2) moves to the highest point, and the conical electrode (3), the proton conducting membrane (6) and the cylindrical electrode are clamped to form an electrochemical system electrode when the needle-shaped electrode shaft (2) moves to the lowest point.
3. The device for measuring the thickness direction conductivity of a proton-conducting membrane according to claim 1, wherein the cylindrical electrode comprises a groove provided on the insulating base (12), and the groove is in a cylindrical shape with a depth of 2mm and a diameter of 2 mm; and a lead II (7) and an electrode end thereof are embedded in the groove, the center of the electrode end face of the lead II (7) is vertically aligned with the electrode end face of the lead I (4) after the installation is finished, and the other ends of the lead I (4) and the lead II (7) are connected with an electrochemical workstation.
4. The device for measuring the thickness direction conductivity of the proton conducting membrane according to claim 1, wherein the transparent plate (5) is a cuboid, a conical groove is formed in the center of the transparent plate (5), vertical ventilation through holes (9) are formed in a conical inclined plane of the conical groove, the diameter of each through hole (9) is less than 2mm, and the number of the through holes (9) is less than 30; the conical inclined plane of the transparent pressing plate (5) is consistent with the conical degree of the conical body.
5. The device for measuring the thickness direction conductivity of the proton conducting membrane according to claim 1, wherein the periphery of the pressure-permeable plate (5) is provided with positioning holes (14), the insulating base (12) is provided with openings (8) corresponding to the positioning holes (14), and the diameter of each opening (8) is larger than that of a fastening bolt by 1 mm; the relative position deviation between the positioning hole (14) and the opening (8) on the insulating base (12) is not more than 1 mm.
6. The device for measuring the thickness direction conductivity of the proton conducting membrane according to claim 1, wherein positioning grooves (10) are formed in two sides of the pressure-permeable plate (5), positioning blocks (11) corresponding to the positioning grooves (10) are formed in the insulating base (12), and the pressure-permeable plate (5) and the insulating base (12) are fixed through fastening bolts.
7. The device for measuring the thickness direction conductivity of the proton conducting membrane according to claim 3, wherein the needle-shaped electrode shaft (2), the cylindrical electrode, the pressure permeable plate (5) and the insulating base (12) are made of polyetheretherketone, polytetrafluoroethylene or PET polymer non-conductive materials;
the lead I (4) and the lead II (7) are made of platinum, gold-plated copper and silver with low resistivity;
the volume resistivity of the non-conductive material is 900-1100 omega cm.
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