Platinum–Cobalt Bimetallic Nanoparticles with Pt Skin for Electro-Oxidation of Ethanol

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• 作者：Bin-Wei Zhang ; Tian Sheng ; Yun-Xiao Wang ; Xi-Ming Qu ; Jun-Ming Zhang ; Zong-Cheng Zhang ; Hong-Gang Liao ; Fu-Chun Zhu ; Shi-Xue Dou ; Yan-Xia JiangShi-Gang Sun
• 刊名：ACS Catalysis
• 出版年：2017
• 出版时间：January 6, 2017
• 年：2017
• 卷：7
• 期：1
• 页码：892-895
• 全文大小：352K
• ISSN：2155-5435

文摘

In order to maximize the Pt utilization in catalysts and improve catalytic processes, we report a convenient strategy for preparation of Pt₃Co with Pt-skin structured bimetallic nanocatalysts directly supported on porous graphitic carbon. Notably, the thickness of the Pt-skin is only 1–2 atomic layers, about 0.5 nm. Surprisingly, the bimetallic nanocatalysts composed of Pt₃Co with Pt-skin are first used as ethanol electro-catalysts, with the mass activity of 0.79 mA μgPt^–1, which is a 250% enhancement compared with commercial Pt/C (0.32 mA μgPt^–1). On the basis of the results of electrochemical in situ Fourier transform infrared spectroscopy (FTIRS) and density functional theory (DFT), a new ethanol electro-oxidation enhancement mechanism is proposed in which Pt₃Co with Pt-skin promotes partial oxidation of ethanol over C–C bond cleavage, thereby resulting in higher CH₃COOH production than CO₂ production.