C / sic composite particles, method for manufacturing the same, electrode catalyst comprising the same, and polymer electrolyte fuel cell

By distributing SiC particles on the inner wall of porous carbon particles to form C/SiC composite particles as catalyst supports, the problem of electrolyte degradation caused by hydrogen peroxide in polymer electrolyte fuel cells is solved, thereby improving the durability and power generation performance of fuel cells.

CN117651690BActive Publication Date: 2026-07-10KK TOYOTA CHUO KENKYUSHO +2
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Patent Information

Application Number
CN202280047495.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-07-07
Filing Date
2022-06-20
Publication Date
2026-07-10
Estimated Expiration
2042-06-20

AI Technical Summary

Technical Problem

In existing technologies, hydrogen peroxide generated in the cathode or anode catalyst layer of polymer electrolyte fuel cells is converted into OH radicals through the Fenton reaction, leading to electrolyte degradation and affecting the durability and power generation performance of the fuel cell.

Method used

C/SiC composite particles are used as catalyst supports. By distributing SiC particles on the inner wall of porous carbon particles, the hydrogen peroxide decomposition function of SiC particles is utilized to rapidly decompose hydrogen peroxide and inhibit electrolyte degradation.

Benefits of technology

It effectively inhibits electrolyte degradation caused by peroxide free radicals, reduces the poisoning of catalyst by electrolyte decomposition products, and improves the durability and power generation performance of fuel cells.

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Abstract

The C / SiC composite particle contains a porous carbon particle and SiC particles distributed on the inner wall surface of the pores of the porous carbon particle. Such a C / SiC composite particle can be obtained by: producing a silica / carbon composite A by causing carbon to be deposited within the pores of a porous silica particle; producing a silica / carbon composite B by removing a portion of the silica from the silica / carbon composite A; heat-treating the silica / carbon composite B to graphitize the carbon; and simultaneously generating SiC. The electrode catalyst contains C / SiC composite particles and catalyst particles supported on the surface of the C / SiC composite particles. Furthermore, a polymer electrolyte fuel cell contains such an electrode catalyst as a cathode catalyst or an anode catalyst.
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