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

Cui, Y.-T.*; Harada, Yoshihisa*; Niwa, Hideharu*; Hatanaka, Tatsuya*; Nakamura, Naoki*; Ando, Masaki*; Yoshida, Toshihiko*; Ishii, Kenji*; Matsumura, Daiju ; Oji, Hiroshi*; Ofuchi, Hironori*; Oshima, Masaharu*

In situ high energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) was used to systematically evaluate interactions of H $_{2}$ O and O $_{2}$ adsorbed on Pt and Pt $_{3}$ Co nanoparticle catalysts in different particle sizes. The systematic increase in oxidation due to adsorption of different species (H $_{2}$ O adsorption O $_{2}$ adsorption O $_{2}$ + H $_{2}$ O coadsorption) suggests that cooperative behavior between O $_{2}$ and H $_{2}$ O 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 O $_{2}$ /H $_{2}$ O adsorption and their cooperative effect upon coadsorption are responsible for the specific activity of Pt catalysts.

Language	:	English
Journal	:	Scientific Reports (Internet)
Volume	:	7
Number	:	1
Pages	:	p.1482_1 - 1482_8
Publication Year/Month	:	2017/05
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Paper URL	:	https://doi.org/10.1038/s41598-017-00639-1
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Keywords	:	高分解能XAFS; Ptナノ粒子; 電極触媒
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20170645
JAEA Abstracts No. : 46000276
Paper Submission No. : 19894

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