CN115047251A - Proton exchange membrane conductivity measurement method, apparatus, device, medium and product - Google Patents

Proton exchange membrane conductivity measurement method, apparatus, device, medium and product Download PDF

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CN115047251A
CN115047251A CN202210746980.4A CN202210746980A CN115047251A CN 115047251 A CN115047251 A CN 115047251A CN 202210746980 A CN202210746980 A CN 202210746980A CN 115047251 A CN115047251 A CN 115047251A
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proton exchange
exchange membrane
conductivity
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郭建伟
王建龙
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Tsinghua University
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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
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

The application relates to a proton exchange membrane conductivity measurement method, device, equipment, medium and product. The method comprises the following steps: acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve. By adopting the method, the contact resistance between the electrode and the proton exchange membrane can be reduced, and the accuracy of conductivity measurement in the membrane penetration direction of the proton exchange membrane can be improved.

Description

Proton exchange membrane conductivity measurement method, apparatus, device, medium and product
Technical Field
The application relates to the technical field of measurement, in particular to a method, a device, equipment, a medium and a product for measuring the conductivity of a proton exchange membrane.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) have the characteristics of high efficiency and low emission, are a new energy source, and have good application prospects in the field of automobile power systems. Among them, a Proton Exchange Membrane (PEM) is a core component of a PEMFC, and has a function of conducting protons, and the electrical conductivity of the PEM is an important parameter affecting the quality of the PEM.
At present, the problem of inaccurate measurement of the conductivity of the proton exchange membrane in the membrane permeation direction exists.
Disclosure of Invention
The application provides a proton exchange membrane conductivity measurement method, device, equipment, medium and product, which can reduce the contact resistance between an electrode and a proton exchange membrane and improve the accuracy of conductivity measurement in the membrane permeation direction of the proton exchange membrane.
In a first aspect, the present application provides a proton exchange membrane conductivity measurement method. The method comprises the following steps:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In one embodiment, the area of the platinum mesh electrode is 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
In one embodiment, determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve includes: determining the characteristic frequency of the proton exchange membrane according to the frequency response curve; determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, determining the conductivity of the pem in the transmembrane direction according to the target voltage comprises: determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, the mapping relationship includes:
Figure BDA0003719738530000021
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one embodiment, determining the characteristic frequency of the proton exchange membrane according to the frequency response curve comprises: and determining the frequency corresponding to the intersection point of the frequency response curve and the frequency axis as the characteristic frequency of the proton exchange membrane.
In one embodiment, obtaining a measured voltage in a transmembrane direction of a proton exchange membrane comprises: and acquiring the measurement voltage of the proton exchange membrane in the permeation direction of the proton exchange membrane in a preset solution in the process of applying current by an electrochemical instrument.
In a second aspect, the application also provides a proton exchange membrane conductivity measurement device. The device includes:
the acquisition module is used for acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through the platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and the determining module is used for determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor realizes the following steps when executing the computer program:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane penetration direction according to the measured voltage and a pre-acquired frequency response curve.
In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
The application provides a proton exchange membrane conductivity measurement method, device, equipment, medium and product, which can adopt a platinum mesh electrode to obtain measurement voltage in the membrane permeation direction of a proton exchange membrane, and determine the conductivity of the proton exchange membrane in the membrane permeation direction according to the measurement voltage and a frequency response curve. Platinum mesh electrodes may be used in the present application to apply current to the proton exchange membrane and obtain a voltage response. When the platinum mesh electrode with the gap is contacted with the surface of the proton exchange membrane, air between the electrode and the surface of the proton exchange membrane can be discharged from the gap, so that the effective contact area between the electrode and the surface of the proton exchange membrane is improved, meanwhile, the contact resistance between the electrode and the surface of the proton exchange membrane, which is generated by the air, is effectively reduced, the accuracy of the obtained measurement voltage of the proton exchange membrane is improved, and the accuracy of the measured conductivity of the proton exchange membrane in the membrane permeation direction is further improved.
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FIG. 1 is a diagram illustrating an exemplary embodiment of a method for measuring conductivity of a proton exchange membrane;
FIG. 2 is a schematic flow chart of a method for measuring the conductivity of a proton exchange membrane according to an embodiment;
FIG. 3 is a schematic diagram of a measurement of a platinum mesh electrode in one embodiment;
FIG. 4 is a schematic diagram of another measurement of a platinum mesh electrode in one embodiment;
FIG. 5 is an equivalent circuit of a platinum mesh electrode and a proton exchange membrane in one embodiment;
FIG. 6 is a schematic illustration of a platinum mesh electrode in one embodiment;
FIG. 7 is another schematic illustration of a platinum mesh electrode in one embodiment;
FIG. 8 is a schematic flow chart of a method for measuring the conductivity of a proton exchange membrane according to an embodiment;
FIG. 9 is a graph showing the impedance curves of the PEM according to one embodiment;
FIG. 10 is a schematic flow chart of a method for measuring the conductivity of a proton exchange membrane according to an embodiment;
FIG. 11 is a graph showing the conductivity of a proton exchange membrane as a function of temperature for one embodiment;
FIG. 12 is another schematic diagram of the electrical conductivity of the PEM according to one embodiment as a function of temperature;
FIG. 13 is a block diagram of an apparatus for measuring conductivity of a proton exchange membrane in an embodiment;
FIG. 14 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The PEMFC has the characteristics of high efficiency and low emission, is a new energy source, and has a good application prospect in the field of automobile power systems. Among them, the PEM is a core component of the PEMFC, and has the function of conducting protons, and the conductivity of the PEM is an important parameter affecting the quality of the PEM.
At present, the problem of inaccurate measurement of the conductivity of the proton exchange membrane in the membrane permeation direction exists.
Based on the method, the device, the equipment, the medium and the product, the method, the device, the medium and the product for measuring the conductivity of the proton exchange membrane can reduce the contact resistance between an electrode and the proton exchange membrane and improve the accuracy of measuring the conductivity of the proton exchange membrane in the membrane penetration direction.
The proton exchange membrane conductivity measurement method provided by the embodiment of the application can be applied to the application environment shown in fig. 1. Wherein the electrochemical instrument 10 communicates with the server 20 through a network. The data storage system may store data that the server 20 needs to process. The data storage system may be integrated on the server 20, or may be located on the cloud or other network server. The electrochemical instrument 10 may collect the relevant parameter data of the proton exchange membrane, and send to the server 20; the server 20 can determine the conductivity of the pem in the transmembrane direction according to the relevant parameter data sent by the electrochemical device 10. The electrochemical device 10 is an electrochemical device that can emit an ac signal. The server 20 may be implemented as a stand-alone server or a server cluster comprising a plurality of servers.
In one embodiment, as shown in fig. 2, a proton exchange membrane conductivity measurement method is provided, which is illustrated by applying the method to the server 20 in fig. 1, and includes the following steps:
step 101, acquiring measurement voltage of a proton exchange membrane in a membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane.
As shown in fig. 3, the electrochemical instrument may apply a test current to the proton exchange membrane through the platinum mesh electrodes respectively disposed on the two side surfaces of the proton exchange membrane, and then obtain a voltage response in the membrane permeation direction of the proton exchange membrane, that is, a measurement voltage in the membrane permeation direction of the proton exchange membrane, through the two platinum mesh electrodes, and send the obtained measurement voltage to the server.
The test current (also referred to as ac perturbation signal) is a variable frequency ac current, i.e. an ac current with gradually increasing frequency. The measured voltage is a voltage response curve, and each point on the curve is a voltage response value of the proton exchange membrane under alternating current disturbance signals with different frequencies.
And 102, determining the conductivity of the proton exchange membrane in the membrane penetration direction according to the measured voltage and a pre-acquired frequency response curve.
In one embodiment, after the electrochemical instrument obtains the measurement voltage in the membrane permeation direction of the proton exchange membrane, a bode diagram (which may be a phase-frequency characteristic curve of the proton exchange membrane) of the proton exchange membrane can be drawn according to the applied alternating-current disturbance signal and the measurement voltage, so as to obtain a frequency response curve of the proton exchange membrane, and the frequency response curve is sent to the server. The server can analyze and process the measured voltage in the membrane permeation direction of the proton exchange membrane and the corresponding frequency response curve, so as to calculate the conductivity in the membrane permeation direction of the proton exchange membrane.
According to the method provided by the embodiment of the application, the platinum mesh electrode can be adopted to obtain the measurement voltage of the proton exchange membrane in the membrane permeation direction, and the conductivity of the proton exchange membrane in the membrane permeation direction is determined according to the measurement voltage and the frequency response curve. It can be seen that a platinum mesh electrode can be used in the present application to apply current to the proton exchange membrane and obtain a voltage response. When the platinum mesh electrode with the gap is contacted with the surface of the proton exchange membrane, air between the electrode and the surface of the proton exchange membrane can be discharged from the gap, so that the effective contact area between the electrode and the surface of the proton exchange membrane is improved, meanwhile, the contact resistance between the electrode and the surface of the proton exchange membrane, which is generated by the air, is effectively reduced, the accuracy of the obtained measurement voltage of the proton exchange membrane is improved, and the accuracy of the measured conductivity of the proton exchange membrane in the membrane permeation direction is further improved.
In one embodiment, the water content of the pem increases gradually over time and is difficult to saturate when the pem is exposed to air, because the water content of the pem has a large influence on the conductivity of the pem in the membrane-through direction. Therefore, the difference of the conductivity of the proton exchange membrane in the membrane permeation direction measured by the server at different moments is large. Therefore, the proton exchange membrane can be placed in a preset solution, and the electrochemical instrument can obtain the measurement voltage of the proton exchange membrane in the preset solution in the membrane permeation direction in the process of applying current.
The predetermined solution may be water. The proton exchange membrane is placed in water, so that the proton exchange membrane can be saturated at a higher speed, the conductivity measured after the proton exchange membrane is saturated can tend to be stable, and the accuracy of the conductivity measured in the membrane permeation direction after the proton exchange membrane is saturated is higher. Moreover, the proton exchange membrane can swell in water, so that the effective contact area between the platinum mesh electrode and the proton exchange membrane is increased, the interface potential between the proton exchange membrane and the platinum mesh electrode is reduced, the influence of the interface potential on the measurement voltage is reduced, and the accuracy of the obtained measurement voltage is improved. In addition, as the proton exchange membrane gradually reaches saturation in water, the resistance of the proton exchange membrane is remarkably reduced (can be reduced from megaohm level to milliohm level or microohm level), so that the whole measuring process tends to small resistance measurement, the measuring sensitivity is increased, and the accuracy of measured voltage is improved.
In one embodiment, the area of the platinum mesh electrode contacting with the two side surfaces of the proton exchange membrane may be 0.03cm 2 -0.3cm 2 The thickness may be 1mm to 8 mm.
In the embodiment of the present application, as shown in fig. 4, a potential difference exists between the two platinum mesh electrodes, and the movement of electrons between the two platinum mesh electrodes causes protons in the proton exchange membrane to move in an opposite direction, so that a potential difference is generated on two sides of the surface of the proton exchange membrane, and an electrochemical instrument can measure a measurement voltage in a membrane permeation direction of the proton exchange membrane. If the area of the platinum mesh is too small, stray current is easily generated, so that the accuracy of the measured voltage is influenced; if the area of the platinum mesh is too large, the water distribution between the platinum mesh electrode and the surface of the proton exchange membrane is easily influenced, so that the air content between the platinum mesh electrode and the surface of the proton exchange membrane is increased, the contact resistance between the platinum mesh electrode and the surface of the proton exchange membrane is increased, and the measurement accuracy of the conductivity of the proton exchange membrane in the membrane penetration direction is reduced.
In the embodiment of the present application, the platinum mesh electrode and the proton exchange membrane may be equivalent to an equivalent circuit as shown in fig. 5. Wherein R is 0 Is the contact resistance between the platinum mesh electrode and the proton exchange membrane; c 0 Is a contact capacitance; r is the resistance of the proton exchange membrane; c 1 Is the capacitance of the proton exchange membrane. Contact resistance R 0 Connected in series with the resistance R of the proton exchange membrane, contacting the capacitance C 0 And contact resistance R 0 Parallel connected proton exchange membrane capacitors C 1 And the resistance R of the proton exchange membrane.
The contact capacitance can be calculated according to the following formula (1) or (2):
Figure BDA0003719738530000061
Figure BDA0003719738530000062
wherein S is 0 Area of platinum mesh electrode; d 0 The thickness of the platinum mesh electrode; epsilon 0 Is a vacuum dielectric constant; ε is the ambient dielectric constant; q is the charge quantity of the platinum mesh electrode; u is the voltage of the platinum mesh electrode.
As can be seen from the above equations (1) and (2), when the area of the platinum mesh electrode is fixed, the environment is fixed, and the current applied by the electrochemical device is fixed, the smaller the thickness of the platinum mesh electrode is, the smaller the partial pressure of the contact resistance is, so that the larger the voltage of the proton exchange membrane is in the measurement voltage measured by the electrochemical device is, and the higher the accuracy of the conductivity of the proton exchange membrane in the membrane permeation direction determined based on the measurement voltage is. Therefore, the thickness of the platinum mesh electrode may be as small as possible, for example, the thickness of the platinum mesh electrode may be in the range of 2mm to 3 mm.
In the present embodiment, the electrode in contact with the surface of the proton exchange membrane may also be other metals or metal compounds with more stable properties. Such as carbon, gold, tungsten carbide, and the like.
In the embodiment of the present application, the platinum mesh electrode may be square or circular, and the shape of the platinum mesh electrode is not limited in the present application as long as the area is within a preset range.
In the embodiment of the present application, the platinum mesh electrode may be formed by transversely and longitudinally weaving platinum wires as shown in fig. 6, or may be formed by preparing platinum wires parallel to each other as shown in fig. 7. The manner of preparing the electrodes is not limited in the present application as long as there is a gap between the platinum wires. In order to reduce the thickness of the platinum mesh electrode, the radius of the platinum wire may be in the range of 1mm to 4 mm.
In the above-mentioned embodiments, a scheme for determining the conductivity in the transmembrane direction of the proton exchange membrane according to the measured voltage and frequency response curve in the transmembrane direction of the proton exchange membrane is described. In another embodiment of the present application, the conductivity of the pem in the transmembrane direction may be determined according to a target voltage corresponding to the frequency response curve in the measured voltage in the transmembrane direction of the pem. Specifically, the method may include the steps shown in fig. 8:
step 201, determining the characteristic frequency of the proton exchange membrane according to the frequency response curve.
Wherein the characteristic frequency is the natural frequency of the proton exchange membrane.
In one embodiment, after receiving the frequency response curve of the proton exchange membrane sent by the electrochemical instrument, the server analyzes the frequency response curve, and determines a frequency corresponding to an intersection point of the frequency response curve and the frequency axis as a characteristic frequency of the proton exchange membrane. Wherein the characteristic frequency of the proton exchange membrane is approximately in the range of 1k-4 kHz.
Step 202, determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane.
In one embodiment, after determining the characteristic frequency of the proton exchange membrane, the server may analyze the measured voltage in the membrane permeation direction of the proton exchange membrane, and determine a voltage response value corresponding to the characteristic frequency point in the voltage response curve as the target voltage.
And 203, determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, after determining the target voltage, the server may obtain the resistance of the proton exchange membrane according to the target voltage and the applied test current, and then calculate the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance.
In one possible implementation, as shown in fig. 9, the electrochemical device may directly output a graph of the impedance curve of the proton exchange membrane under the test current. The server can determine the resistance value corresponding to the intersection point of the impedance curve and the horizontal axis in the figure as the resistance of the proton exchange membrane, and then calculate the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance. Wherein, the horizontal axis is the real part of the impedance of the proton exchange membrane, and the vertical axis is the imaginary part of the impedance of the proton exchange membrane.
The method provided by the embodiment of the application can determine the target voltage of the proton exchange membrane according to the characteristic frequency of the proton exchange membrane, and then determine the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage and the test current. Therefore, the conductivity of the proton exchange membrane in the membrane penetration direction can be determined according to the voltage corresponding to the characteristic frequency of the proton exchange membrane, and the accuracy of conductivity measurement is improved.
In the above examples, a solution for determining the conductivity of a proton exchange membrane in the membrane permeation direction according to the target voltage and the test current of the proton exchange membrane is described. In another embodiment of the present application, the conductivity of the pem in the transmembrane direction can be calculated according to the target voltage of the pem and the resistance determined by the test current. Specifically, the method may include the steps shown in fig. 10:
step 301, determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current.
And 302, determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, since the test current applied by the electrochemical instrument is an ac current, the target voltage of each region is also an ac voltage (i.e., the test current and the target voltage are both in a complex form). Therefore, before calculating the resistance of the proton exchange membrane in the membrane permeation direction, the server may first take the real part of the test current and the real part of the target voltage in the membrane permeation direction, and then determine the quotient of the real part of the target voltage in the membrane permeation direction and the real part of the test current as the resistance in the membrane permeation direction. Finally, the server may calculate the conductivity of the proton exchange membrane in the membrane permeation direction according to a preset mapping relationship, that is, the following formula (3), based on the resistance in the membrane permeation direction:
Figure BDA0003719738530000081
wherein, sigma is the conductivity of the proton exchange membrane in the membrane permeation direction; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one possible implementation, the conductivity of the pem in the transmembrane direction can also be calculated according to the following formula (4):
Figure BDA0003719738530000091
wherein, sigma is the conductivity of the proton exchange membrane in the membrane permeation direction; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; w is the length of the proton exchange membrane; t is the width of the proton exchange membrane.
The method provided by the embodiment of the application can determine the resistance of the proton exchange membrane according to the target voltage and the test current of the proton exchange membrane, and calculate the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and the preset mapping relation. Therefore, the conductivity of the proton exchange membrane in the membrane penetration direction can be determined according to the target voltage corresponding to the characteristic frequency of the proton exchange membrane, and the accuracy of conductivity measurement is improved.
In one embodiment, as shown in FIG. 11, FIG. 11 shows a graph of conductivity in the membrane permeation direction as a function of temperature, measured at a test current of DC and AC, respectively, for a 24.3 μm thick PEM. As shown in fig. 12, fig. 12 shows the measured conductivity in the membrane permeation direction as a function of temperature for a proton exchange membrane with a thickness of 27.4 μm under the conditions that the test current is a direct current and an alternating current, respectively.
As can be seen from fig. 11 and 12, the conductivity of the proton exchange membrane in the membrane penetration direction measured by the platinum mesh electrode in the embodiment of the present application is between 0.12S/cm and 0.14S/cm, and in the reference range of the conductivity of the proton exchange membrane in the membrane penetration direction, it can be seen that the accuracy of the conductivity measurement method in the membrane penetration direction of the proton exchange membrane provided in the embodiment of the present application is higher.
As can be seen from fig. 11 and 12, the proton exchange membrane has conductivity in the membrane permeation direction that does not change with temperature in an aqueous environment. The water content of the proton exchange membrane has a significant effect on the conductivity in the direction of the transmembrane.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the present application further provides a proton exchange membrane conductivity measurement apparatus for implementing the proton exchange membrane conductivity measurement method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so specific limitations in one or more embodiments of the proton exchange membrane conductivity measurement device provided below can be referred to the limitations on the proton exchange membrane conductivity measurement method in the above, and are not described herein again.
In one embodiment, as shown in fig. 13, there is provided a proton exchange membrane conductivity measurement apparatus, including: an obtaining module 401 and a determining module 402, wherein:
an obtaining module 401, configured to obtain, through a platinum mesh electrode, a measurement voltage in a membrane permeation direction of a proton exchange membrane; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane.
And a determining module 402, configured to determine, according to the measured voltage and a pre-obtained frequency response curve, conductivity of the proton exchange membrane in the membrane permeation direction.
In one embodiment, the area of the platinum mesh electrode is 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
In one embodiment, the determining module 402 is specifically configured to determine a characteristic frequency of the proton exchange membrane according to a frequency response curve; determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, the determining module 402 is further configured to determine the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, the mapping relationship includes:
Figure BDA0003719738530000101
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one embodiment, the determining module 402 is further configured to determine a frequency corresponding to an intersection of the frequency response curve and the frequency axis as a characteristic frequency of the proton exchange membrane.
In one embodiment, the obtaining module 401 is specifically configured to obtain a measured voltage in a transmembrane direction of the proton exchange membrane in a preset solution during the process of applying the current by the electrochemical instrument.
The modules in the proton exchange membrane conductivity measuring device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as in fig. 14. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store some data related to the proton exchange membrane conductivity measurement method described in the embodiment of the present application, for example, the measured voltage, the test current, the thickness, the area, the resistance, and the like of the proton exchange membrane described above. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a proton exchange membrane conductivity measurement method.
Those skilled in the art will appreciate that the architecture shown in fig. 14 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In one embodiment, the area of the platinum mesh electrode is 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining the characteristic frequency of the proton exchange membrane according to the frequency response curve; determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, the mapping relationship includes:
Figure BDA0003719738530000121
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and determining the frequency corresponding to the intersection point of the frequency response curve and the frequency axis as the characteristic frequency of the proton exchange membrane.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and acquiring the measurement voltage of the proton exchange membrane in the permeation direction of the proton exchange membrane in a preset solution in the process of applying current by an electrochemical instrument.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In one embodiment, the area of the platinum mesh electrode is 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the characteristic frequency of the proton exchange membrane according to the frequency response curve; determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, the mapping relationship includes:
Figure BDA0003719738530000122
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining the frequency corresponding to the intersection point of the frequency response curve and the frequency axis as the characteristic frequency of the proton exchange membrane.
In one embodiment, the computer program when executed by the processor further performs the steps of: and acquiring the measurement voltage of the proton exchange membrane in the permeation direction of the proton exchange membrane in a preset solution in the process of applying current by an electrochemical instrument.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of the two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
In one embodiment, the area of the platinum mesh electrode is 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the characteristic frequency of the proton exchange membrane according to the frequency response curve; determining a target voltage according to the characteristic frequency and the measured voltage of the proton exchange membrane; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current; and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
In one embodiment, the mapping relationship includes:
Figure BDA0003719738530000131
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; s is the area of the proton exchange membrane.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining the frequency corresponding to the intersection point of the frequency response curve and the frequency axis as the characteristic frequency of the proton exchange membrane.
In one embodiment, the computer program when executed by the processor further performs the steps of: and acquiring the measurement voltage of the proton exchange membrane in the permeation direction of the proton exchange membrane in a preset solution in the process of applying current by an electrochemical instrument.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (11)

1. A method for measuring the conductivity of a proton exchange membrane, the method comprising:
acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through a platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of two sides of the proton exchange membrane;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measurement voltage and a pre-acquired frequency response curve.
2. The method of claim 1, wherein the platinum mesh electrode has an area of 0.03cm 2 -0.3cm 2 (ii) a The thickness of the platinum mesh electrode is 1mm-8 mm.
3. The method of claim 1, wherein the determining the conductivity of the pem in the transmembrane direction according to the measured voltage and a pre-obtained frequency response curve comprises:
determining the characteristic frequency of the proton exchange membrane according to the frequency response curve;
determining a target voltage according to the characteristic frequency of the proton exchange membrane and the measurement voltage;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the target voltage.
4. The method of claim 3, wherein the determining the conductivity of the PEM in the transmembrane direction according to the target voltage comprises:
determining the resistance of the proton exchange membrane according to the target voltage and the test current applied by the electrochemical instrument; the test current is variable frequency alternating current;
and determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the resistance and a preset mapping relation.
5. The method of claim 4, wherein the mapping comprises:
Figure FDA0003719738520000011
wherein σ is the conductivity of the proton exchange membrane; r is the resistance of the proton exchange membrane; d is the thickness of the proton exchange membrane; and S is the area of the proton exchange membrane.
6. The method of claim 3, wherein said determining a characteristic frequency of said proton exchange membrane from said frequency response curve comprises:
and determining the frequency corresponding to the intersection point of the frequency response curve and the frequency axis as the characteristic frequency of the proton exchange membrane.
7. The method of claim 1, wherein the obtaining the measured voltage in the transmembrane direction of the pem comprises:
and acquiring the measurement voltage of the proton exchange membrane in the permeation direction of the proton exchange membrane in a preset solution in the process of applying current by an electrochemical instrument.
8. A proton exchange membrane conductivity measurement apparatus, comprising:
the acquisition module is used for acquiring the measurement voltage of the proton exchange membrane in the membrane permeation direction through the platinum mesh electrode; the platinum mesh electrodes are respectively contacted with the surfaces of two sides of the proton exchange membrane;
and the determining module is used for determining the conductivity of the proton exchange membrane in the membrane permeation direction according to the measured voltage and a pre-acquired frequency response curve.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
11. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 7 when executed by a processor.
CN202210746980.4A 2022-06-29 2022-06-29 Proton exchange membrane conductivity measurement method, apparatus, device, medium and product Pending CN115047251A (en)

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