CN112834930B - Fuel cell membrane electrode parameter measuring method and device based on potential scanning - Google Patents
Fuel cell membrane electrode parameter measuring method and device based on potential scanning Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 27
- 210000000170 cell membrane Anatomy 0.000 title claims abstract description 21
- 210000004027 cell Anatomy 0.000 claims abstract description 92
- 239000001257 hydrogen Substances 0.000 claims abstract description 91
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 91
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 87
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- 239000007789 gas Substances 0.000 claims abstract description 14
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 48
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- 238000001514 detection method Methods 0.000 abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
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- 150000002431 hydrogen Chemical class 0.000 description 2
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- 239000000498 cooling water Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The application provides a fuel cell membrane electrode parameter measuring method and device based on potential scanning, and relates to the technical field of proton exchange membrane fuel cells, wherein the method comprises the following steps: supplying hydrogen at one end of the fuel cell and supplying inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain a set temperature, and setting the humidity of gas entering from the cathode and the anode to be constant; accessing an external excitation source to perform multiple groups of linear potential scanning with different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning; analyzing the response current density to obtain the membrane electrode parameters of the fuel cell. Therefore, the influence of the scanning rate and the catalyst loading capacity on the detection result is avoided, the real hydrogen permeation current can be detected, and the detection result is more stable, accurate and credible.
Description
Technical Field
The application relates to the technical field of proton exchange membrane fuel cells, in particular to a fuel cell membrane electrode parameter measuring method and device based on potential scanning.
Background
The proton exchange membrane fuel cell has high efficiency and no pollution, and has wide application prospect in the fields of vehicle power sources and fixed power sources. The membrane electrode is an important place for the electrochemical reaction of hydrogen and oxygen, is a proton and electron transfer medium, is an inlet and outlet channel of gas and water, and is a core component of a proton exchange membrane fuel cell. Therefore, when assembling the fuel cell stack, screening the membrane electrodes with the same quality is a fundamental way to ensure the consistency of the performance and the service life of the single cells in the stack. Wherein, part of the reaction gas can penetrate the proton exchange membrane to reach the other pole of the cell, thereby forming 'permeation current', causing the performance of the fuel cell to be reduced, and even endangering the use safety of the fuel cell. The linear potential scanning technology is an effective means for detecting the hydrogen permeation current, and is widely applied to the test evaluation of the quality of the proton exchange membrane. However, the current detection technology has certain defects, so that the detected hydrogen permeation current has certain deviation.
(1) The obtained current response curve has larger deviation under different voltage scanning rates, and the basic trend is that the higher the scanning rate is, the larger the hydrogen permeation current measurement value is.
(2) Neglecting the influence of the electronic resistance of the membrane, the detection result of the hydrogen permeation current is higher, and the membrane electrode test method generally considers that the response current value of about 0.4V is the hydrogen permeation current, but actually is the sum of the hydrogen permeation current and the short circuit current under the voltage, and the true hydrogen permeation current should be slightly smaller than the measured value at this time.
(3) The accuracy of the hydrogen permeation current detection result is influenced by different catalyst loading amounts, and when linear potential scanning is carried out, hydrogen permeating to a cathode is subjected to oxidation reaction under the action of a cathode catalyst to generate current. The loading of the catalyst affects the detection of the hydrogen permeation current, and thus the judgment of the tightness of the proton exchange membrane.
The accuracy of detecting the hydrogen permeation current by the conventional linear potential scanning method is influenced by the scanning rate, the insulativity of the membrane and the catalyst loading capacity.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a fuel cell membrane electrode parameter measurement method based on potential scanning, which optimizes a conventional linear potential scanning method, so as to avoid the influence of the scanning rate and the catalyst loading capacity on the detection result, and simultaneously detect the real hydrogen permeation current, so that the detection result is more stable, accurate and reliable.
The second purpose of the application is to provide a fuel cell membrane electrode parameter measuring device based on potential scanning.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a fuel cell membrane electrode parameter measuring method based on potential scanning, including:
supplying hydrogen at one end of the fuel cell and supplying inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain a set temperature, and setting the humidity of gas entering from the cathode and the anode to be constant;
accessing an external excitation source to perform multiple groups of linear potential scanning of different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning;
and analyzing the response current density to obtain the membrane electrode parameters of the fuel cell.
According to the fuel cell membrane electrode parameter measuring method based on potential scanning, hydrogen is supplied to one end of a fuel cell, inert gas is supplied to the other end of the fuel cell, exhaust back pressure is set, the cell is controlled to maintain set temperature, and meanwhile the humidity of gas entering a cathode and an anode is set to be constant; accessing an external excitation source to perform multiple groups of linear potential scanning with different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning; analyzing the response current density to obtain the membrane electrode parameters of the fuel cell. Therefore, the influence of the scanning rate and the catalyst loading capacity on the detection result is avoided, the real hydrogen permeation current can be detected, and the detection result is more stable, accurate and credible.
Optionally, in an embodiment of the present application, the analyzing the response current density to obtain a membrane electrode parameter of the fuel cell includes:
acquiring a linear section in a linear relation on an electric current voltage curve, or acquiring a sub-section of the linear section as an analysis section;
analyzing the analysis interval in a preset analysis mode to obtain the electric double layer capacitance, the short-circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell.
Optionally, in an embodiment of the present application, the analyzing the analysis interval by a preset analysis manner to obtain an electric double layer capacitance, a short circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell includes:
in the analysis interval, the same voltage u0Next, different scanning rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, for said i ═ AjFitting x + b to obtain AjThe value of (a) is,a obtained by fitting under all voltages in the analysis intervaljAverage value of (2)
As the electric double layer capacitor Cdl；
Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + c e1/B, the intercept hydrogen permeation current iH＝c；
Solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
Optionally, in an embodiment of the present application, the analyzing the analysis interval by a preset analysis manner to obtain an electric double layer capacitance, a short circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell includes:
in the analysis interval, under the same scanning speed, obtaining the linear relation between different voltages u and current densities i: i ═ Bju + d, linear fitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is the reciprocal 1/R of the short-circuit resistancee；
From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the slope CdlIntercept iH＝c；
Solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
Optionally, in one embodiment of the present application, the initial scan voltage is greater than the concentration potential and the highest voltage is less than the safe voltage.
Optionally, in an embodiment of the present application, the external excitation source includes, but is not limited to, one or more of a constant voltage power supply, a dynamic power supply, and an electrochemical workstation.
In order to achieve the above object, a second embodiment of the present application provides a fuel cell membrane electrode parameter measuring device based on potential scanning, including:
the device comprises a setting module, a control module and a control module, wherein the setting module is used for supplying hydrogen at one end of a fuel cell and inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain set temperature and setting the humidity of gas entering from a cathode and an anode to be constant;
the scanning and recording module is used for accessing an external excitation source to perform multiple groups of linear potential scanning of different scanning rates on the fuel cell and recording the response current density under the multiple groups of linear potential scanning;
and the analysis acquisition module is used for analyzing the response current density to acquire the membrane electrode parameters of the fuel cell.
According to the fuel cell membrane electrode parameter measuring device based on potential scanning, hydrogen is supplied to one end of a fuel cell, inert gas is supplied to the other end of the fuel cell, exhaust back pressure is set, the cell is controlled to maintain set temperature, and meanwhile the humidity of gas entering from a cathode and an anode is set to be constant; accessing an external excitation source to perform multiple groups of linear potential scanning with different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning; analyzing the response current density to obtain the membrane electrode parameters of the fuel cell. Therefore, the influence of the scanning rate and the catalyst loading capacity on the detection result is avoided, the real hydrogen permeation current can be detected, and the detection result is more stable, accurate and credible.
Optionally, in an embodiment of the present application, the analyzing the response current density to obtain a membrane electrode parameter of the fuel cell includes:
acquiring a linear section in a linear relation on an electric current voltage curve, or acquiring a sub-section of the linear section as an analysis section;
analyzing the analysis interval in a preset analysis mode to obtain the electric double layer capacitance, the short-circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell.
Optionally, in an embodiment of the present application, the analyzing the analysis interval by a preset analysis manner to obtain an electric double layer capacitance, a short circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell includes:
in the analysis interval, the same voltage u0Next, different scanning rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, for said i ═ AjFitting x + b to obtain AjA value of (a), a fitted at all voltages within the analysis intervaljAverage value of (2)
As the electric double layer capacitor Cdl；
Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + c e1/B, the intercept hydrogen permeation current iH＝c；
Solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
In an embodiment of the application, the analyzing the analysis interval by a preset analysis method to obtain an electric double layer capacitance, a short circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell includes:
linear relationship of voltage u and current density i: i ═ Bju + d, linear fitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is the reciprocal 1/R of the short-circuit resistancee；
From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the slope CdlIntercept iH＝c；
Solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
Optionally, in one embodiment of the present application, the initial scan voltage is greater than the concentration potential and the highest voltage is less than the safe voltage.
Optionally, in an embodiment of the present application, the external excitation source includes, but is not limited to, one or more of a constant voltage power supply, a dynamic power supply, and an electrochemical workstation.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for measuring parameters of a membrane electrode of a fuel cell based on potential scanning according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for measuring parameters of a membrane electrode of a fuel cell based on potential scanning according to an embodiment of the present application;
FIG. 3 is a diagram illustrating an example of a path-first analysis result of the present analysis method according to the embodiment of the present application;
FIG. 4 is a diagram illustrating a second analysis result of the second path in the present analysis method according to the embodiment of the present application;
fig. 5 is a schematic structural diagram of a fuel cell membrane electrode parameter measuring device based on potential scanning according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The fuel cell membrane electrode parameter measurement method and device based on potential sweep according to the embodiment of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for measuring parameters of a membrane electrode of a fuel cell based on potential scanning according to an embodiment of the present disclosure.
As shown in FIG 1, the fuel cell membrane electrode parameter measuring method based on potential scanning comprises the following steps:
and step 101, supplying hydrogen at one end of the fuel cell and supplying inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain the set temperature, and setting the humidity of the gas of the cathode and anode inlet gas to be constant.
And 102, accessing an external excitation source to perform multiple groups of linear potential scanning of different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning.
And 103, analyzing the response current density to obtain the membrane electrode parameters of the fuel cell.
In the embodiment of the application, a linear section in a linear relation on a current-voltage curve is obtained, or a sub-section of the linear section is an analysis section; and analyzing the analysis interval in a preset analysis mode to obtain the electric double layer capacitance, the short-circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell.
In this embodiment of the present application, analyzing the analysis interval in a preset analysis manner to obtain an electric double layer capacitance, a short-circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell, includes:
in the embodiment of the present application, in the analysis interval, under the same voltage u0, different scan rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, p.i ═ AjFitting x + b to obtain AjValue of (a), A fitted at all voltages within the analysis intervaljAverage value of (2)
As an electric double layer capacitor Cdl(ii) a Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + c e1/B, intercept hydrogen penetration current iHC; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
In this embodiment of the present application, analyzing the analysis interval in a preset analysis manner to obtain an electric double layer capacitance, a short-circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell, includes: in an analysis interval, under the same scanning speed, obtaining the linear relation of different voltages u and current densities i: i ═ Bju + d, linear fitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is reciprocal 1/R of short-circuit resistancee(ii) a From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the slope CdlIntercept iHC; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
In the embodiment of the present application, the initial scan voltage is greater than the concentration potential, and the highest voltage is less than the safety voltage. Specifically, the start scanning voltage is slightly higher than the concentration potential, and is set to: the concentration potential + alpha (alpha is between 10 and 50 mV), the highest voltage is not higher than the safe voltage, and the scanning speed is generally between 10 and 60 mV/s.
In the embodiment of the present application, the external excitation source includes, but is not limited to, one or more of a constant voltage power supply, a dynamic power supply, and an electrochemical workstation.
Specifically, the anode side of the fuel cell supplies nitrogen, the cathode side supplies hydrogen, or the anode side of the fuel cell supplies hydrogen, and the cathode side supplies nitrogen.
As an example of a scenario, the fuel cell membrane electrode parameter measurement method based on potential scanning is performed in three steps (as shown in fig. 2): and step S01: the fuel cell anode side is fed with hydrogen (1.5SLPM) and the cathode side is fed with an inert gas (including but not limited to nitrogen, helium, argon) (N)21.5SLPM) and all set the exhaust back pressure (0.4bar), supply cooling water to maintain the set temperature (70 ℃) of the cell while ensuring constant humidity (80%) of the gas admitted to the cathode and anode. And step S02: and (3) connecting an external excitation source, performing multiple groups of linear potential scanning of different scanning rates on the fuel cell, wherein the scanning rates are 25, 30, 35, 40, 45 and 50mV/s, and recording the response current density under corresponding scanning voltage. And step S03: and analyzing the recorded data.
Specifically, 1, determining an analysis interval: the interval initial point is behind the linear segment initial point, and the whole analysis interval is in a segment with a linear relation of i-V. 2. Two paths of resolution: the membrane electrode parameters of the fuel cell can be obtained by two analytic methods: electric double layer capacitance, short circuit resistance, hydrogen permeation current, catalyst active area.
Specifically, two analytic paths of the linear potential scanning optimization method include the following specific steps:
(1) determining a resolution interval (0.477V, 0.582V); (2) at the same voltage u0, different scan rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b to obtain AjAverage value of (2)
Namely, the electric double layer capacitor Cdl(ii) a (3) The different voltages u and b are linear: b is Bu + c, and the slope B is 2.3354 Ω-1Intercept c is 3.0443 a; (4) solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the peak area and the scanning curve by the corresponding scanning speed j, and then calculating the average value under all the scanning speeds to obtain the hydrogen desorption charge
As shown in fig. 3.
The second route comprises the following specific steps:
(1) determining an analysis interval (0.442V, 0.582V); (2) at the same scanning rate x0Next, a linear relationship is obtained that the different voltages u and current densities i exhibit: i ═ Bju + d to obtain BjAverage value of (2)
I.e. the reciprocal 1/R of the short-circuit resistancee(ii) a (3) Linear relationship of different scan rates x and d: d is Ax + c, the slope a is 0.0455F, and the intercept c is 3.0239 a; (4) solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the peak area and the scanning curve by the corresponding scanning speed j, and then calculating the average value under all the scanning speeds to obtain the hydrogen desorption charge
As shown in fig. 4.
According to the fuel cell membrane electrode parameter measuring method based on potential scanning, hydrogen is supplied to one end of a fuel cell, inert gas is supplied to the other end of the fuel cell, exhaust back pressure is set, the cell is controlled to maintain set temperature, and meanwhile the humidity of gas entering a cathode and an anode is set to be constant; accessing an external excitation source to perform multiple groups of linear potential scanning with different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning; analyzing the response current density to obtain the membrane electrode parameters of the fuel cell. Therefore, the influence of the scanning rate and the catalyst loading capacity on the detection result is avoided, the real hydrogen permeation current can be detected, and the detection result is more stable, accurate and credible.
In order to realize the embodiment, the application also provides a fuel cell membrane electrode parameter measuring device based on potential scanning.
Fig. 5 is a schematic structural diagram of a fuel cell membrane electrode parameter measuring device based on potential scanning according to an embodiment of the present application.
As shown in fig. 5, the fuel cell membrane electrode parameter measuring device based on potential scanning comprises: a setup module 510, a scan record module 520, and a parse acquisition module 530.
And a setting module 510, configured to supply hydrogen at one end of the fuel cell and inert gas at the other end of the fuel cell, and set exhaust back pressure, and control the cell to maintain a set temperature, while setting the humidity of the gas entering the cathode and anode to be constant.
And a scanning and recording module 520, configured to access an external excitation source to perform multiple sets of linear potential scans with different scanning rates on the fuel cell, and record response current densities under the multiple sets of linear potential scans.
And an analysis obtaining module 530, configured to analyze the response current density to obtain a membrane electrode parameter of the fuel cell.
In an embodiment of the application, the analyzing the response current density to obtain the membrane electrode parameters of the fuel cell includes: acquiring a linear section in a linear relation on an electric current voltage curve, or acquiring a sub-section of the linear section as an analysis section; analyzing the analysis interval in a preset analysis mode to obtain the electric double layer capacitance, the short-circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell.
In an embodiment of the application, the analyzing the analysis interval by a preset analysis method to obtain an electric double layer capacitance, a short circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell includes: in the analysis interval, the same voltage u0Next, different scanning rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, for said i ═ AjFitting x + b to obtain AjA value of (a), a fitted at all voltages within the analysis intervaljAverage value of (2)
As the electric double layer capacitor Cdl(ii) a Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + ce1/B, the intercept hydrogen permeation current iHC; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
In one embodiment of the present application, the linear relationship of voltage u and current density i: i ═ Bju + d, linear fitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is the reciprocal 1/R of the short-circuit resistancee(ii) a From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the slope CdlIntercept iHC; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
Optionally, in one embodiment of the present application, the initial scan voltage is greater than the concentration potential and the highest voltage is less than the safe voltage.
Optionally, in an embodiment of the present application, the external excitation source includes, but is not limited to, one or more of a constant voltage power supply, a dynamic power supply, and an electrochemical workstation.
According to the fuel cell membrane electrode parameter measuring device based on potential scanning, hydrogen is supplied to one end of a fuel cell, inert gas is supplied to the other end of the fuel cell, exhaust back pressure is set, the cell is controlled to maintain set temperature, and meanwhile the humidity of gas entering from a cathode and an anode is set to be constant; accessing an external excitation source to perform multiple groups of linear potential scanning with different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning; analyzing the response current density to obtain the membrane electrode parameters of the fuel cell. Therefore, the influence of the scanning rate and the catalyst loading capacity on the detection result is avoided, the real hydrogen permeation current can be detected, and the detection result is more stable, accurate and credible.
It should be noted that the foregoing explanation of the embodiment of the method for measuring the membrane electrode parameters of the fuel cell based on potential scanning also applies to the device for measuring the membrane electrode parameters of the fuel cell based on potential scanning of this embodiment, and will not be described again here.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. 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.
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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (4)
1. A fuel cell membrane electrode parameter measuring method based on potential scanning is characterized by comprising the following steps:
supplying hydrogen at one end of the fuel cell and supplying inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain a set temperature, and setting the humidity of gas entering from the cathode and the anode to be constant;
accessing an external excitation source to perform multiple groups of linear potential scanning of different scanning rates on the fuel cell, and recording response current densities under the multiple groups of linear potential scanning;
analyzing the response current density to obtain the membrane electrode parameters of the fuel cell, wherein the parameters comprise:
acquiring a linear section in a linear relation on an electric current voltage curve, or acquiring a sub-section of the linear section as an analysis section;
analyzing the analysis interval in a preset analysis mode to obtain the electric double layer capacitance, the short-circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell, wherein the analysis mode comprises the following steps: in the analysis interval, the same voltage u0Next, different scanning rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, for said i ═ AjFitting x + b to obtain AjA value of (a), a fitted at all voltages within the analysis intervaljAverage value of (2)
As the electric double layer capacitor Cdl；
Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + ce1/B, hydrogen permeation current iHIntercept c; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the scanning curves of the scanning speed by the corresponding scanning speed j to obtain the average value of all the scanning speeds, thus obtaining the hydrogen desorption charge
By passing
To give out AECSAIs the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2；
Wherein, the analyzing interval is analyzed through a preset analyzing mode to obtain the electric double layer capacitance, the short circuit resistance, the hydrogen permeation current and the catalyst active area as the membrane electrode parameters of the fuel cell, and the method further comprises the following steps: in the analysis interval, under the same scanning speed, obtaining the linear relation between different voltages u and current densities i: i ═ Bju + d, go on lineFitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is the reciprocal 1/R of the short-circuit resistancee；
From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the electric double layer capacitor CdlHydrogen permeation current iHIntercept c;
solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSAIs the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
2. The method of claim 1,
the initial scan voltage is greater than the concentration potential and the maximum voltage is less than the safe voltage.
3. The method of claim 1,
the accessed external excitation source comprises one or more of but not limited to a constant voltage power supply, a dynamic power supply and an electrochemical workstation.
4. A fuel cell membrane electrode parameter measuring device based on potential scanning is characterized by comprising:
the device comprises a setting module, a control module and a control module, wherein the setting module is used for supplying hydrogen at one end of a fuel cell and inert gas at the other end of the fuel cell, setting exhaust back pressure, controlling the cell to maintain set temperature and setting the humidity of gas entering from a cathode and an anode to be constant;
the scanning and recording module is used for accessing an external excitation source to perform multiple groups of linear potential scanning of different scanning rates on the fuel cell and recording the response current density under the multiple groups of linear potential scanning;
an analysis obtaining module, configured to analyze the response current density to obtain a membrane electrode parameter of the fuel cell, where the analysis obtaining module includes:
the acquisition unit is used for acquiring a linear section which is in a linear relation on an electric current voltage curve, or a sub-section of the linear section is an analysis section;
an analysis unit, configured to analyze the analysis interval in a preset analysis manner, and obtain an electric double layer capacitance, a short-circuit resistance, a hydrogen permeation current, and a catalyst active area as membrane electrode parameters of the fuel cell, where the analysis unit is specifically configured to:
in the analysis interval, the same voltage u0Next, different scanning rates x are obtained in a linear relationship with the current density i: i ═ Ajx + b, for said i ═ AjFitting x + b to obtain AjA value of (a), a fitted at all voltages within the analysis intervaljAverage value of (2)
As the electric double layer capacitor Cdl；
Within the analysis interval, different voltages u and b are in a linear relationship: b is Bu + c, and the short-circuit resistance R is obtained by fitting the b Bu + ce1/B, hydrogen permeation current iHIntercept c; solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReThe peak area between the scanning curve and the scanning rate is divided by the corresponding scanning rate j to obtain the average value under all the scanning rates, and the hydrogen desorption charge is obtained
By passing
To give out AECSAIs the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2Wherein, the parsing unit is further specifically configured to:
in the analysis interval, under the same scanning speed, obtaining the linear relation between different voltages u and current densities i: i ═ Bju + d, linear fitting to obtain BjB obtained at multiple scanning ratesjAverage value of (2)
Is the reciprocal 1/R of the short-circuit resistancee；
From the linear relationship of the different scan rates x and d: d is Ax + C, and linear fitting is carried out to obtain the electric double layer capacitor CdlHydrogen permeation current iHIntercept c;
solving the straight line i of j at the scanning speed as Ajx+iH+u0/ReDividing the peak area between the hydrogen desorption and the scanning curve by the corresponding scanning speed j to obtain the average value under all the scanning speeds to obtain the hydrogen desorption charge
By passing
To give out AECSACatalyzing to the catalyst active area; wherein gamma is the required electric quantity for hydrogen desorption of the single-layer platinum electrode and has a value of 0.21mC/cm2L is the platinum loading of the electrode in g/cm2。
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