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

その場高分解能X線吸収分光によって明らかにした水蒸気によるプラチナ触媒の酸化促進

Cui, Y.-T.*; 原田慈久*; 丹羽秀治*; 畑中達也*; 中村直樹*; 安藤雅樹*; 吉田稔彦*; 石井賢司*; 松村大樹 ; 陰地宏*; 大渕博宣*; 尾嶋正治*

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.

使用言語	:	English
掲載資料名	:	Scientific Reports (Internet)
巻	:	7
号	:	1
ページ数	:	p.1482_1 - 1482_8
発行年月	:	2017/05
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キーワード	:	高分解能XAFS; Ptナノ粒子; 電極触媒

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論文URL	:	https://doi.org/10.1038/s41598-017-00639-1
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使用施設	:	SPring-8(大型放射光施設)
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InCites™	:	パーセンタイル：49.18 分野：Multidisciplinary Sciences
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登録番号 : AA20170645
抄録集掲載番号 : 46000276
論文投稿番号 : 19894

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