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K-edge X-ray absorption fine structure analysis of Pt/Au core-shell electrocatalyst : evidence for short Pt-Pt distance

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Title: K-edge X-ray absorption fine structure analysis of Pt/Au core-shell electrocatalyst : evidence for short Pt-Pt distance
Authors: Kaito, Takahiro Browse this author
Mitsumoto, Hisashi Browse this author
Sugawara, Seiho Browse this author
Shinohara, Kazuhiko Browse this author
Uehara, Hiromitsu Browse this author
Ariga, Hiroko Browse this author
Takakusagi, Satoru Browse this author →KAKEN DB
Hatakeyama, Yoshikiyo Browse this author
Nishikawa, Keiko Browse this author →KAKEN DB
Asakura, Kiyotaka Browse this author →KAKEN DB
Issue Date: 24-Apr-2014
Publisher: American Chemical Society
Journal Title: Journal of physical chemistry. C
Volume: 118
Issue: 16
Start Page: 8481
End Page: 8490
Publisher DOI: 10.1021/jp501607f
Abstract: A carbon-supported Pt-shell Au-core electrocatalyst (Pt/Au/C) was prepared by sequential deposition of Pt ions on the surface of Au nanoparticles supported on carbon. The area-specific activity of the oxygen reduction reaction (ORR) for the prepared Pt/Au/C in 0.1 M HClO4, aqueous solution was approximately 2 times higher than that for a commercial carbon-supported Pt electrocatalyst (Pt/C). The core-shell structure was confirmed using electrochemical methods and Pt and Au K-edge X-ray absorption fine structure (XAFS) analysis. XAFS analyses indicated that the Pt-Pt bond distance for the Pt/Au/C catalyst was shorter than that for Pt foil and the Pt/C catalyst. In addition, the Au Au distance was much shorter than that for Au foil. The reason for the high ORR activity of Pt/Au/C is considered to be shorter Pt-Pt bond distance as compared to that of Pt/C.
Type: article
URI: http://hdl.handle.net/2115/56614
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 朝倉 清高

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