Pt nanoparticles supported on submicrometer-sized TiO₂ spheres for effective methanol and ethanol oxidation

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• 作者：Hao Hua ; Chenguo Hu ; Zhenhuan Zhao ; Hong Liu ; Xiao Xie ; Yi Xi
• 关键词：Titanium dioxide ; Submicrometer-sized sphere ; Platinum catalyst ; Electrooxidation ; Proton-exchange membrane fuel cell
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：30 August, 2013
• 年：2013
• 卷：105
• 期：Complete
• 页码：130-136
• 全文大小：2906 K

文摘

High electrocatalytic activity for alcohol electrooxidation by Pt nanoparticles supported on submicrometer-sized TiO₂ spheres is achieved. The Pt nanoparticles with a diameter of 8-20 nm are uniformly coated on the surface of the submicrometer-sized TiO₂ spheres with a diameter of 370-500 nm via a simple wet chemical synthesis. The electrocatalytic performances of the Pt/TiO₂ submicrometer-sized TiO₂ spheres for methanol and ethanol in acidic and alkaline media are investigated systematically by electrochemical methods. Compared with the Pt catalyst supported on the commercial carbon black, the Pt/TiO₂ spheres exhibit an excellent enhanced electrocatalytic activity and stability owing to the mesoporous active sites, synergistic effect of Pt/TiO₂, and micro-channels for liquid diffusion and gaseous product to escape.