Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7738818 | Journal of Power Sources | 2014 | 6 Pages |
Abstract
Ni@Pt core-shell nanoparticles with Pt nanocrystal thin film are synthesized by chemical reduction to investigate methanol oxidation. The morphology, structure, and composition of the as-prepared nanoparticles are characterized by aberration-corrected high-resolution transmission electron microscopy, X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. Electrochemical characterizations are performed by cyclic voltammetry, in situ Fourier transform infrared spectroscopy, and chronoamperometry. Results show that the as-prepared nanoparticles have a core-shell nanostructure. Moreover, Pt on the shell is composed of small clusters that are poorly crystalline domains of different crystal faces. The Pt mass activity of the as-prepared nanoparticles is about three times that of conventional E-TEK 40Â wt% Pt/C catalysts, and methanol oxidation over the as-prepared nanoparticles is found to occur at a lower overpotential than over Pt/C. The as-prepared nanoparticles also exhibit markedly high resistance to carbon monoxide deactivation. This high electrocatalytic performance can be attributed to the unique structure of the as-prepared nanoparticles.
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Authors
Qinbo Yuan, Donghong Duan, Yanhua Ma, Guoqiang Wei, Zhonglin Zhang, Xiaogang Hao, Shibin Liu,