Electrocatalytic Performance of Gold Nanoparticles Supported on Activated Carbon for Methanol Oxidation in Alkaline Solution

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• 作者：Shaohui Yan ; Shichao Zhang ; Ye Lin ; Guanrao Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 14, 2011
• 年：2011
• 卷：115
• 期：14
• 页码：6986-6993
• 全文大小：999K
• 年卷期：v.115,no.14(April 14, 2011)
• ISSN：1932-7455

文摘

Gold nanoparticles supported on activated carbon (Au/C) are prepared by rapid reduction of AuCl₄^{鈭?/sup> on the surface of activated carbon with KBH₄ in the presence of polyvinylpyrrolidone. Through the characterization of the transmission electron microscope, the Au nanoparticles (AuNPs) are highly well dispersed on the carbon support. Cyclic voltammetry, quasi-steady-state polarization, and electrochemical impedance spectroscopy methods are employed to investigate the catalytic activity of the Au/C catalyst for the methanol electro-oxidation (MEO) and the reaction kinetics. The results indicate that the Au/C catalyst shows good catalytic activity toward the MEO, and the weakly adsorbed OH鈭?/sup> on the surface of AuNPs has auxiliary catalysis for the MEO. On the basis of this crucially auxiliary catalysis, a novel mechanism of the rate-determining step of the MEO catalyzed by Au/C in alkaline solution is proposed.}