With the aim of developing durable electrocatalysts for polymer electrolyte fuel cells, their durability with different carbon supports have been evaluated electrochemically in our study. During our previous investigation, we have found that graphitization of carbon surface through the heat treatment at appropriate temperature is a simple but useful technique to improve the durability of electrocatalysts. Especially, a electrocatalyst made by heat treatment of Vulcan carbon at 1600 °C, Pt/GVC1600, has shown much more improved durability than one made without heat treatment, Pt/VC, in the half-cell evaluation. In this study, MEA with Pt/GVC1600 for the cathode was developed and evaluated. Initial performance of MEA was found to be almost the same between these two catalysts, but regarding to durability, Pt/GVC1600 showed much more improved durability than Pt/VC. Heat treatment of carbon supports at optimum temperature lead to increasing in durability not only in the half-cell but also in the full-cell.
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