Structural and electrocatalytic properties of PtIrCo/C catalysts for oxygen reduction reaction

Rameshwori Loukrakpam, Bridgid N. Wanjala, Jun Yin, Bin Fang, Jin Luo, Minhua Shao, Lesia Protsailo, Tetsuo Kawamura, Yongsheng Chen, Valeri Petkov, Chuan Jian Zhong

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

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 °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 nanoparticles 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.

Original languageEnglish
Pages (from-to)562-572
Number of pages11
JournalACS Catalysis
Volume1
Issue number5
DOIs
StatePublished - May 6 2011

Keywords

  • electrocatalytic activity and durability
  • fcc-type lattice parameter
  • nanoengineered trimetallic catalysts
  • oxygen reduction reaction
  • platinum-iridium-cobalt nanoparticles

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