Carbon xerogels as catalyst supports for PEM fuel cell cathode

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• 作者：Nathalie Job ; Julien Marie ; Sté ; phanie Lambert ; S ; rine Berthon-Fabry ; Patrick Achard
• 关键词：Carbon aerogel ; Carbon xerogel ; PEM fuel cell ; Pt catalyst
• 刊名：Energy Conversion and Management
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：49
• 期：9
• 页码：2461-2470
• 全文大小：810 K

文摘

Carbon xerogels with various pore textures were prepared by evaporative drying and pyrolysis of resorcinol–formaldehyde gels, and used as supports for Pt catalysts in PEM fuel cell cathodes. The goal of this study was to determine whether carbon xerogels could replace the carbon aerogels which were previously used as Pt catalyst supports in the same electrochemical system, and to determine how the pore texture influences the cell performances. Pt catalysts were prepared by impregnation of carbon supports with aqueous H₂PtCl₆ solution followed by reduction in aqueous phase with NaBH₄. Fuel cell measurements show that the metal surface actually available for the oxygen reduction reaction and the voltage losses due to diffusion phenomena strongly depend on the carbon pore texture. Finally, some carbon xerogels yield similar performance than carbon aerogels.