Journal Article Wetting induced oxidation of Pt-based nano catalysts revealed by in situ high energy resolution X-ray absorption spectroscopy

Cui, Yitao  ,  Harada, Yoshihisa  ,  Niwa, Hideharu  ,  Hatanaka, Tatsuya  ,  Nakamura, Naoki  ,  Ando, Masaki  ,  Yoshida, Toyohiko  ,  Ishii, Kenji  ,  Matsumura, Daiju  ,  Oji, Hiroshi  ,  Ofuchi, Hironori  ,  Oshima, Masaharu

Description
In situ high energy resolution fluorescence detection x-ray absorption spectroscopy (HERFD-XAS) was used to evaluate systematically the interactions of H2O and O2 adsorbed on Pt and Pt3Co nanoparticle catalysts in different 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.

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