期刊
ELECTROCHIMICA ACTA
卷 123, 期 -, 页码 233-239出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.153
关键词
Electrocatalysis; Ethanol electro-oxidation; PtAu alloy; Core-shell; Fuel cells
Two bimetallic Pt-Au catalysts supported on carbon, namely core-shell structured nanoparticles (Au@Pt/C) and alloy-like nanoparticles (AuPt/C), were synthesized and tested for ethanol electrooxidation in acidic environment. The catalysts were characterized by X-ray diffraction; X-ray photoelectron spectroscopy and transmission electron microscopy. Catalytic activity was quantified by anodic CO-stripping voltammetry, and cyclic voltammetry of ethanol electro-oxidation. The electronic interaction between Pt and Au was demonstrated by X-ray photoelectron spectroscopy and the effect was found to be more prominent in the alloy-like PtAu nanoparticles. X-ray diffraction revealed expanded Pt lattice parameter and interatomic distance in the PtAu nanoparticles. The interaction between Pt and Au of PtAu/C and Au@Pt/C samples was the main cause of the enhanced CO tolerance. The stronger Pt-Au interaction and the expanded Pt lattice parameter in alloyed PtAu/C contributed to the higher specific activity towards ethanol electro-oxidation of PtAu/C compared to Au@Pt/C. (C) 2014 Elsevier Ltd. All rights reserved.
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