高分子電解質形燃料電池における長時間運転中の電極触媒変化の解析

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The electrode catalyst of a fuel cell is an important component because it is the electric generating part of the cell. The authors carried out a long-term durability test of a PEFC electrode using 6 test cells with a Pt-Ru alloy for the anode catalyst and a Pt-Co alloy for the cathode catalyst. During 12000 hours of cell operation, electrochemical measurements were conducted at 1000 hour intervals. The cells were disassembled after 0 (initial), 3600, 6200, 9000, 11200 and 12000 hours of operation to observe the electrode components. By analyses of the electrode materials, such as a change in a particle of the electrode catalyst, dissolution of the alloy catalysts, catalyst migration to the electrolyte membrane, and a change in the amount of electrolyte ionomer, the relationship between the material change and the cell deterioration was revealed.
2009-05-05