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Method for measuring oxygen effective diffusion coefficient in fuel cell catalyst layer

A fuel cell and diffusion coefficient technology, applied in gas diffusion analysis, diffusion analysis, measuring devices, etc., can solve problems such as difficult reactions

Active Publication Date: 2017-01-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

At present, the effective diffusion coefficient of oxygen in the catalytic layer is mostly calculated by using non-experimental methods or directly citing empirical values, it is difficult to reflect the actual influence of different experimental conditions

Method used

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  • Method for measuring oxygen effective diffusion coefficient in fuel cell catalyst layer
  • Method for measuring oxygen effective diffusion coefficient in fuel cell catalyst layer
  • Method for measuring oxygen effective diffusion coefficient in fuel cell catalyst layer

Examples

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Embodiment 1

[0032] In the present invention, the membrane electrode required for the experiment is prepared by electrostatic spraying method, and the structure is as follows: figure 1 shown. Firstly, the Pt / C catalyst slurry was prepared, the ion resin was commercial Nafion, and the solvent was ethanol. The mass fraction of carbon in the slurry is 0.39%, and the mass ratio of Nafion to carbon is 0.8. The prepared slurry was ultrasonically vibrated for 20 minutes and then used for spraying. In this example, the cathode and anode catalytic layers are sprayed on both sides of the Nafion proton membrane by electrostatic spraying method, the spraying temperature is 90°C, and the Pt loading of the cathode and anode is 0.1mg / cm 2 . Second, spray DCL with different thicknesses on the outside of the sprayed cathode catalyst layer. The DCL thicknesses selected in this example are 15um, 22um, and 30um. The thickness of the DCL was measured by electron microscopy (e.g. figure 2 shown). The ca...

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Abstract

The invention designs a method for measuring the oxygen effective diffusion coefficient in a fuel cell catalyst layer. The method includes the steps of S1, assembling double membrane electrodes into a fuel cell; S2, detecting the limited current of the fuel cell; S3, substituting the limited current into a Fick law shown in the formula I to obtain the diffusion coefficient of an electrode layer, wherein CO2 is experiment control amount of oxygen concentration, CPt and suf are oxygen concentrations of a Pt surface, delta is the thickness of a simulation catalyst layer, and all can be obtained through experiment measurement. The method has the advantages that DCL does not contain Pt and is free of electrochemical reaction, so the mass transfer characteristic can be presented through the Fick law; the manufacturing method, material composition and CL of the DCL are completely consistent, and the mass transfer characteristic of CL can be effectively copied; by measuring the limited current, the relation between the oxygen flux and the concentration is obtained, and the effective mass transfer coefficient is calculated through the Fick law.

Description

technical field [0001] The invention relates to a method for measuring the effective diffusion coefficient of oxygen in a fuel cell catalyst layer, belonging to the technical field of fuel cells. Background technique [0002] Membrane electrodes include an anode catalyst layer, a proton exchange membrane and a cathode catalyst layer. During the operation of the battery, oxygen diffuses into the cathode catalyst layer and electrochemically reacts on the Pt surface. Therefore, the effective diffusion coefficient of oxygen in the cathode catalytic layer becomes an important parameter restricting the performance of fuel cells. Different membrane electrode manufacturing processes and conditions will result in catalytic layers with different diffusion properties, and the diffusion coefficient can be measured in time, which has a high reference value for the performance evaluation of membrane electrodes. At present, the effective diffusion coefficient of oxygen in the catalytic l...

Claims

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Application Information

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IPC IPC(8): G01N13/04G01N15/08
CPCG01N13/04G01N15/082G01N2013/003G01N2015/0015
Inventor 章俊良王超程晓静张卿雷沈水云罗柳轩胡宸溢朱凤鹃
Owner SHANGHAI JIAO TONG UNIV
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