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 Ag 9 Pt 91 to Ag 83 Pt 17 by controlling the ratios of PtCl 4 2− /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.
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He et al. (2009) studied this question.
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