Journal
ACS CATALYSIS
Volume 1, Issue 5, Pages 562-572Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs200022s
Keywords
nanoengineered trimetallic catalysts; platinum-iridium-Cobalt nanoparticles; oxygen reduction reaction; fcc-type lattice parameter; electrocatalytic activity and durability
Categories
Funding
- UTC Power
- NSF [CBET-0709113]
- DOE's Office of Biological and Environmental Research located at PNNL
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This paper describes the results of an investigation of the synthesis of PtIrCo nanoparticles (2-3 nm) for electrocatalytic oxygen reduction reaction. The carbon supported PtIrCo catalysts (PtIrCo/C) were thermally treated at temperatures ranging from 400 to 900 degrees C. The size, composition, and atomic-scale structures of the PtIrCo/C catalysts were characterized for establishing their correlation with the electrocatalytic activity toward. oxygen reduction reaction. The specific activity was found to increase by a factor of 3-5 for the PtIrCo/C catalysts in comparison with Pt/C catalysts. A correlation was identified between the specific activity and the nanoparticle's fcc-type lattice parameter. The specific activity increases whereas the fcc-type lattice parameter decreases with the thermal treatment temperature. This correlation was further substantiated by analyzing the interatomic spatial parameters in the trimetallic nanoparticles based on X-ray absorption fine structure spectroscopic and high-energy XRD experiments. Implications of these findings, along with the durability of the catalysts, to the design of active electrocatalysts were also discussed.
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