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|Title:||Preparation of carbon-supported core-shell Au-Pt nanoparticles for methanol oxidation reaction: The Promotional effect of the Au core||Authors:||Zeng, J.
|Issue Date:||7-Dec-2006||Citation:||Zeng, J., Yang, J., Lee, J.Y., Zhou, W. (2006-12-07). Preparation of carbon-supported core-shell Au-Pt nanoparticles for methanol oxidation reaction: The Promotional effect of the Au core. Journal of Physical Chemistry B 110 (48) : 24606-24611. ScholarBank@NUS Repository. https://doi.org/10.1021/jp0640979||Abstract:||Core-shell Au-Pt nanoparticles with intimate contact of Pt and Au were prepared by a displacement reaction without formation of monometallic Au nanoparticles. The Au-Pt nanoparticles were dispersed on carbon (Au@Pt/C) and were used to catalyze methanol electroxidation in acidic solutions at room temperature. The core-shell nanostructure was confirmed by transmission electron microscopy and X-ray photoelectron spectroscopy, and specific catalytic activities were evaluated by CO anodic stripping voltammetry in 0.5 M H 2SO4 and by cyclic voltammetry in 1 M CH3OH + 0.5 M H2SO4. The Au@Pt/C catalyst demonstrated enhanced specific activity in methanol electrooxidation and showed multiple CO stripping peaks which were all negatively shifted with respect to a similarly prepared Ag@Pt/C catalyst. The activity enhancement is attributed to the presence of Au underneath a very thin Pt shell where electron exchange between Au and Pt had promoted the formation of active oxygen species on Pt, which facilitated the removal of inhibiting CO-like reaction intermediates. © 2006 American Chemical Society.||Source Title:||Journal of Physical Chemistry B||URI:||http://scholarbank.nus.edu.sg/handle/10635/89898||ISSN:||15206106||DOI:||10.1021/jp0640979|
|Appears in Collections:||Staff Publications|
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