Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 21, Pages 7985-7991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja402072r
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Funding
- MRSEC of the National Science Foundation [DMR 0819762]
- DOE Hydrogen Initiative [DE-FG02-05ER15728]
- DOE EERE through General Motors [DE-EE0000458]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy
- Chesonis Foundation
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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 magnitude enhancement to the weakened CO binding on Pt in discrete Pt or Pt-rich dusters surrounded the true surface Au atoms. Our finding demonstrates the importance of surface composition control at the nanoscale in harnessing e 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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