Novel core-shell Pt/WC@TiO₂ electro-catalyst for methanol oxidation

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• 作者：Chenbin Xu ; Meiqin Shi ; Lingzhi Kang ; Chun-an Ma ; ^{science@zjut.edu.cn}
• 关键词：Tungsten carbide (WC) ; Titanium dioxide (TiO2) ; Core&ndash ; shell structure ; Interfaces ; Oxidation
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：91
• 期：Complete
• 页码：183-186
• 全文大小：792 K

文摘

In this paper, we successfully synthesized novel core-shell structure Pt/WC@TiO₂ microspheres. This structure was confirmed by physical characterization, and the catalyst was further investigated by electrochemical measurements. It was found that Pt/WC@TiO₂ catalyst had a higher methanol oxidation performance, better stability and enhanced CO-tolerance in the electro-oxidation process compared with Pt/WC/TiO₂. We believe that these phenomena were caused by the special TiO₂-core and WC-shell structure. Primarily, core-shell structure Pt/WC@TiO₂ can hinder the aggregation of WC and provides more contact surface to insure effective interaction between WC and Pt. Furthermore, this structure greatly increases TiO₂-WC-Pt triple interface, which strengthens the synergistic effects among these TiO₂-WC-Pt parts.