Pt-Guided Formation of Pt−Ag Alloy Nanoislands on Au Nanorods and Improved Methanol Electro-Oxidation

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• 作者：Weiwei He ; Xiaochun Wu ; Jianbo Liu ; Ke Zhang ; Weiguo Chu ; Lili Feng ; Xiaona Hu ; Weiya Zhou ; Sishen Xie
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：June 18, 2009
• 年：2009
• 卷：113
• 期：24
• 页码：10505-10510
• 全文大小：290K
• 年卷期：v.113,no.24(June 18, 2009)
• ISSN：1932-7455

文摘

A simple and facile method was developed to fabricate alloyed Pt−Ag nanoislands on Au nanorods (denoted as Au@Pt−Ag NRs). The island growth mode of Pt on the Au rod was employed to guide the growth behavior of Pt−Ag alloys. The formation of the Pt−Ag alloy was confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), UV−visible absorption spectra, and electrochemical characterization. The alloy compositions can be tuned within the broad miscibility gap from Ag₉Pt₉₁ to Ag₈₃Pt₁₇ by controlling the ratios of PtCl₄²⁻/Ag⁺_. The Au@Pt−Ag NRs show tunable surface plasmon resonance (SPR) and enhanced catalytic activity for methanol electro-oxidation, pointing to a potential future of nanometerized Pt−Ag alloys in fuel cells and other related fields. Apart from Pt−Ag, this strategy may be applied to the formation of Pt-related bimetallic (trimetallic) systems.