TY - JOUR
T1 - Surface composition tuning of Au-Pt bimetallic nanoparticles for enhanced carbon monoxide and methanol electro-oxidation
AU - Suntivich, Jin
AU - Xu, Zhichuan
AU - Carlton, Christopher E.
AU - Kim, Junhyung
AU - Han, Binghong
AU - Lee, Seung Woo
AU - Bonnet, Nicéphore
AU - Marzari, Nicola
AU - Allard, Lawrence F.
AU - Gasteiger, Hubert A.
AU - Hamad-Schifferli, Kimberly
AU - Shao-Horn, Yang
PY - 2013/5/29
Y1 - 2013/5/29
N2 - 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.
AB - 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.
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U2 - 10.1021/ja402072r
DO - 10.1021/ja402072r
M3 - Article
C2 - 23646922
AN - SCOPUS:84878386495
SN - 0002-7863
VL - 135
SP - 7985
EP - 7991
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 21
ER -