Electrooxidation of methanol on highly active and stable Pt-Sn-Ce/C catalyst for direct methanol fuel cells

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• 作者：Arun Murthy ; Eungje Lee ; Arumugam Manthiram ; ^{rmanth@mail.utexas.edu}
• 关键词：Methanol oxidation reaction ; Pt&ndash ; Sn catalyst ; Pt&ndash ; Sn&ndash ; Ce catalyst ; Electrochemical stability ; Direct methanol fuel cell
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：13 June, 2012
• 卷：121-122
• 期：Complete
• 页码：154-161
• 文件大小：1606 K

摘要

Carbon supported Pt-Sn-Ce and Pt-Sn catalysts have been synthesized by a polyol reduction method and compared for methanol oxidation reaction (MOR). X-ray photoelectron spectroscopic (XPS), X-ray diffraction (XRD), and transmission electron microscopic (TEM) analyses reveal the beneficial effects of the Ce component in Pt-Sn-Ce/C for MOR, despite its low content. Electrochemical techniques such as CO_ad stripping, linear scan, and derivative voltammetries along with electrochemical impedance spectroscopy (EIS) were employed to analyze MOR on Pt-Sn-Ce/C and Pt-Sn/C from a mechanistic point of view. Accelerated durability test (ADT) and single cell test of Pt-Sn-Ce/C in comparison to a commercial PtRu/C catalyst demonstrate the superior performance of Pt-Sn-Ce/C from stability and activity points of view.