and O/HO adsorption revealed by in situ XAFS and hard X-ray photoelectron spectroscopyCui, 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 adsorption and O/HO 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 HO hinders the successive O adsorption on Pt surface, while under the pressure of 1 bar, the adsorption of HO enhances the adsorption of O 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.
Language |
: | English |
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Journal |
: | |
Volume |
: | 72 |
Number |
: | 8 |
Pages |
: | p.131 - 136 |
Publication Year/Month |
: | 2016/10 |
Meeting title |
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Held date |
: | 2016/05 |
Location (city) |
: | San Diego |
Location (country) |
: | U.S.A. |
Paper URL |
: |
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Keywords |
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: |
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Percentile:48.91 Category:Electrochemistry |
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