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Method for testing oxygen mass transfer resistance of ordered electrodes

A technology of mass transfer resistance and testing method, which is applied to circuits, fuel cells, electrical components, etc., and can solve problems such as high cost and insufficient service life

Inactive Publication Date: 2019-10-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology currently has some technical and economic problems that restrict its development, such as excessive use of noble metal catalysts resulting in high cost and insufficient service life.
At present, there are a large number of literatures reporting the research on low-platinum ordered electrodes, the main purpose is to reduce the cost of proton exchange membrane fuel cells. Oxygen transfer is related to the resistance of oxygen to the surface of platinum, and this resistance is particularly prominent at low platinum levels, which has become one of the difficulties in the study of low platinum ordered electrodes
At present, the research on oxygen transport in low-platinum ordered electrodes is only qualitatively analyzed by testing polarization curves, and if the oxygen mass transfer resistance at different limiting current densities can be tested, it will be able to improve the oxygen transport in low-platinum ordered electrodes. Quantitative analysis of mass resistance

Method used

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  • Method for testing oxygen mass transfer resistance of ordered electrodes
  • Method for testing oxygen mass transfer resistance of ordered electrodes
  • Method for testing oxygen mass transfer resistance of ordered electrodes

Examples

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Embodiment 1

[0031] Ordered electrode preparation: sputtering 0.04mg / cm on GDL using magnetron sputtering technology 2 Pt, prepare ordered electrodes, and use them as cathode electrodes to make MEA; figure 1 It is the SEM image of the ordered electrode of the present invention, from which the stripes of the ordered texture structure can be seen, and the tested Pt loading is 0.04mg / cm 2 , is a low-platinum ordered electrode;

[0032] Limiting current density test: the assembly compression rate of a single cell is 20%, the battery operating temperature is 80°C, the air flow is 1.6L / min for the anode, 2.0L / min for the cathode, 50% humidity for the cathode and anode, and 100KPa for the back pressure. Adjust the cathode The side oxygen concentration is 6%, the mixed gas is oxygen and nitrogen, start to test the limit current density, increase the current slowly, and the voltage starts to drop. When the voltage drops to 0.2V, the voltage is difficult to stabilize at this time and drops to zero....

Embodiment 2

[0038] Ordered electrode preparation: sputtering 0.04mg / cm on GDL using magnetron sputtering technology 2 Pt, and use it as cathode electrode to make MEA

[0039]Limiting current test: The compression rate of single cell assembly is 15%, the operating temperature of the battery is 80°C, the air flow is 1.6L / min for the anode, 2.0L / min for the cathode, 60% humidity for the cathode and anode, and 150KPa for the back pressure. Adjust the cathode side The oxygen concentration is 6%, the mixed gas is oxygen and nitrogen, start to test the limit current density, slowly increase the current, the voltage starts to drop, when the voltage drops to 0.2V, the voltage is difficult to stabilize at this time, and drops to zero, record the current The current density is the limiting current density. Stop the test, and after a period of purging with nitrogen, continue to increase the cathode oxygen concentration to 8%, and continue to test the limiting current density in this way until the ox...

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Abstract

The invention relates to a method for testing oxygen mass transfer resistance of ordered electrodes. The method comprises the steps of firstly preparing ordered electrodes through magnetron sputtering; preparing a membrane electrode and then testing limited current density of the membrane electrode at different oxygen concentrations through optimizing test conditions; and calculating the oxygen mass transfer resistance according to the tested limited current density. According to the method, the internal oxygen mass transfer resistance of low-platinum ordered electrodes after being prepared into the membrane electrode (MEA) is successfully tested, and the method is of great significance for study on oxygen transfer of the low-platinum ordered electrodes and is especially suitable for testing of the oxygen mass transfer resistance of the low-platinum ordered electrodes in the field of proton exchange membrane fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for testing oxygen mass transfer resistance of ordered electrodes. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) have attracted much attention in recent years because of their low operating temperature, high power density, fast start-up, and fast response to load changes. However, this technology currently has some technical and economic problems that restrict its development, such as excessive use of noble metal catalysts resulting in high cost and insufficient service life. At present, there are a large number of literatures reporting the research on low-platinum ordered electrodes, the main purpose is to reduce the cost of proton exchange membrane fuel cells. Oxygen transfer is related to the resistance of oxygen to the surface of platinum, and this resistance is particularly prominent at low platinum, which has become one of the diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26H01M8/04313
CPCG01N27/26H01M8/04313Y02E60/50
Inventor 王雅东韩凯凯郭伟潘牧
Owner WUHAN UNIV OF TECH
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