Scientific Reports (May 2017)

Wetting Induced Oxidation of Pt-based Nano Catalysts Revealed by In Situ High Energy Resolution X-ray Absorption Spectroscopy

  • Yi-Tao Cui,
  • Yoshihisa Harada,
  • Hideharu Niwa,
  • Tatsuya Hatanaka,
  • Naoki Nakamura,
  • Masaki Ando,
  • Toshihiko Yoshida,
  • Kenji Ishii,
  • Daiju Matsumura,
  • Hiroshi Oji,
  • Hironori Ofuchi,
  • Masaharu Oshima

DOI
https://doi.org/10.1038/s41598-017-00639-1
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 8

Abstract

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Abstract In situ high energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) was used to systematically evaluate interactions of H2O and O2 adsorbed on Pt and Pt3Co nanoparticle catalysts in different particle sizes. The systematic increase in oxidation due to adsorption of different species (H2O adsorption <O2 adsorption <O2 + H2O coadsorption) suggests that cooperative behavior between O2 and H2O adsorptions is responsible for the overpotential induced by hydrated species in fuel cells. From the alloying and particle size effects, it is found that both strength of O2/H2O adsorption and their cooperative effect upon coadsorption are responsible for the specific activity of Pt catalysts.