Surface composition tuning of Au-Pt bimetallic nanoparticles for enhanced carbon monoxide and methanol electro-oxidation

Jin Suntivich, Zhichuan Xu, Christopher E. Carlton, Junhyung Kim, Binghong Han, Seung Woo Lee, Nicéphore Bonnet, Nicola Marzari, Lawrence F. Allard, Hubert A. Gasteiger, Kimberly Hamad-Schifferli, Yang Shao-Horn

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

274 Zitate (Scopus)

Abstract

The ability to direct bimetallic nanoparticles to express desirable surface composition is a crucial step toward effective heterogeneous catalysis, sensing, and bionanotechnology applications. Here we report surface composition tuning of bimetallic Au-Pt electrocatalysts for carbon monoxide and methanol oxidation reactions. We establish a direct correlation between the surface composition of Au-Pt nanoparticles and their catalytic activities. We find that the intrinsic activities of Au-Pt nanoparticles with the same bulk composition of Au0.5Pt0.5 can be enhanced by orders of magnitude by simply controlling the surface composition. We attribute this enhancement to the weakened CO binding on Pt in discrete Pt or Pt-rich clusters surrounded by surface Au atoms. Our finding demonstrates the importance of surface composition control at the nanoscale in harnessing the true electrocatalytic potential of bimetallic nanoparticles and opens up strategies for the development of highly active bimetallic nanoparticles for electrochemical energy conversion.

OriginalspracheEnglisch
Seiten (von - bis)7985-7991
Seitenumfang7
FachzeitschriftJournal of the American Chemical Society
Jahrgang135
Ausgabenummer21
DOIs
PublikationsstatusVeröffentlicht - 29 Mai 2013

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