Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 29, Pages 11880-11883Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja303950v
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Funding
- NSF [DMR-0449849, DMR-1120901]
- AFOSR [FA9550-08-1-0325]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1120901] Funding Source: National Science Foundation
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This communication describes the synthesis of Pt-M (M = Au, Ni, Pd) icosahedral nanocrystals based on the gas reducing agent in liquid solution method. Both CO gas and organic surface capping agents play critical roles in stabilizing the icosahedral shape with {111} surfaces. Among the Pt-M alloy icosahedral nanocrystals generated, Pt3Ni had an impressive ORR specific activity of 1.83 mA/cm(Pt)(2) and 0.62 A/mg(Pt). Our results further show that the area-specific activity, of icosahedral Pt3Ni catalysts was about 50% higher than that of the octahedral Pt,Ni catalysts (1.26 mA/cm(Pt)(2)), even though both shapes are bound by {111} facets. Density functional theory calculations and molecular dynamics simulations indicate that this improvement may arise from strain-induced electronic effects.
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