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Electronic structure of Pt and Pt-Co nanoparticles with O$$_{2}$$ and O$$_{2}$$/H$$_{2}$$O adsorption revealed by in situ XAFS and hard X-ray photoelectron spectroscopy

その場XAFSと硬X線光電子分光で明らかにしたPt及びPtCoナノ粒子の酸素及び水吸着時における電子構造

Cui, Y.*; 原田 慈久*; 畑中 達也*; 中村 直樹*; 安藤 雅樹*; 吉田 稔彦*; 池永 英司*; 石井 賢司*; 松村 大樹; Li, R.*; 尾嶋 正治*

Cui, Y.*; Harada, Yoshihisa*; Hatanaka, Tatsuya*; Nakamura, Naoki*; Ando, Masaki*; Yoshida, Toshihiko*; Ikenaga, Eiji*; Ishii, Kenji*; Matsumura, Daiju; Li, R.*; Oshima, Masaharu*

The electronic structures of Pt and Pt-Co nanoparticles with O$$_{2}$$ adsorption and O$$_{2}$$/H$$_{2}$$O co-adsorption were investigated by in situ hard X-ray photoelectron spectroscopy (HAXPES) and in situ high resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) to clarify the effects of water adsorption on fuel cell cathode catalysis surface. The experimental results suggest that under the pressure of 1 mbar, the adsorption of H$$_{2}$$O hinders the successive O$$_{2}$$ adsorption on Pt surface, while under the pressure of 1 bar, the adsorption of H$$_{2}$$O enhances the adsorption of O$$_{2}$$ on Pt surface. This water effect is found to be more significant on Pt surface than on Pt-Co surface. These results would be helpful to understand how the water affects the fuel cell performance and why Pt-Co nanoparticles show higher oxygen reduce reaction (ORR) activity than Pt nanoparticles.

使用言語

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English

掲載資料名

 :

ECS Transactions

巻

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72

号

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8

ページ数

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p.131 - 136

発行年月

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2016/10

出版社名

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Electrochemical Society

発表会議名

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229th Electrochemical Society Meeting

開催年月

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2016/05

開催都市

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San Diego

開催国

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U. S. A.

キーワード

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XAFS; 硬X線光電子分光; Pt電極触媒

特許データ

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PDF

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論文URL

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https://doi.org/10.1149/07208.0131ecst

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使用施設

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SPring-8(大型放射光施設)

広報プレスリリース

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論文解説記事
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受委託・共同研究相手機関

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Access

 :

- Accesses

InCites™

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パーセンタイル：34.85

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