TiO₂ nanoparticles promoted Pt/C catalyst for ethanol electro-oxidation

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• 作者：Lihong Yu^a ; Jingyu Xi^b ; ^{xijingyu@gmail.com}
• 关键词：Direct ethanol fuel cells ; Ethanol electro-oxidation ; Pt/C catalysts ; TiO2 nanoparticles ; Composite anode catalysts
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：15 April, 2012
• 卷：67
• 期：Complete
• 页码：166-171
• 文件大小：1108 K

摘要

A simple and efficient method to enhance the activity of Pt/C catalysts for direct ethanol fuel cells (DEFCs) by ultrasonically mixing commercial Pt/C catalyst and TiO₂ nanoparticles is reported. In this novel composite anode catalyst, the as-prepared TiO₂ nanoparticles are dispersed homogeneously in the interspaces of Pt based C nanoparticles, resulting in a great deal of TiO₂-Pt-C interfaces, which greatly accelerate the ethanol electro-oxidation reaction. Cyclic voltammetry (CV), CO stripping, chronoamperometry and electrochemical impedance spectroscopy (EIS) measurements confirm that this composite catalyst structure has excellent activity and stability toward ethanol and CO electro-oxidation compared to the pure Pt/C catalyst. Particle size and content of TiO₂ are also discussed with respect to effect on catalyst performance.