Gas diffusion electrode and mfg. method thereof

Abstract

This invention relates to gas diffusion electrode. It includes one gas diffusion layer and on catalyst layer, one mesosphere is set between the two layers said. The gas diffusion electrode preparation method is also provided in this invention, procedures are that one gas diffusion layer is provided and one mesosphere is formed on it, one catalyst layer is formed on the mesosphere to get the gas diffusion electrode. One mesosphere layer is set as catalyst crystal seed among the electrode, diffusion layer and catalyst layer, so the catalyst layer and the diffusion layer can better combine without affecting conductivity of the electrode. Gas phase deposition method is used to deposit one mesosphere which has good binding power with the gas diffusion layer during the diffusion electrode making process; liquor deposition method is used deposit needed thickness catalyst layer, so the cost can be reduced. Fine crystal, non pore and good physical chemical properties catalyst layer is got through optimize pulse type electrolysis.

Description

【Technical field】 [0001] The present invention relates to the technical field of fuel cells, in particular to a gas diffusion electrode for fuel cells and a manufacturing method thereof. 【Background technique】 [0002] A fuel cell is a battery device that uses an electrochemical reaction to generate electricity. It has been attracting attention since its development. At present, the governments of economically developed countries such as the United States, Japan, and Canada have formulated relevant policies to develop fuel cells. When the fuel cell works, fuel gas (such as hydrogen) and combustion accelerant (such as oxygen) are transported to the anode and cathode of the cell respectively, and oxidation and reduction reactions occur to convert chemical energy into electrical energy for output. [0003] The core part of the electrochemical reaction of a fuel cell is a membrane electrode assembly (MEA), which is similar in structure to a sandwich, and is formed by connecting ...

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Problems solved by technology

[0005] However, the Pt / C catalyst obtained by the above-mentioned preparation method is to first disperse platinum in the carbon black carrier in an oxidized state or an ion state, and then convert it into a metallic state by means of reduction or heating. Among them, platinum is prone to re-agglomeration, resulting in reduced dispersion, and the expected high dispersion cannot be achieved, and the above-mentioned process is relatively complicated.

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