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Role of Cerium Oxide in the Enhancement of Activity for the Oxygen Reduction Reaction at Pt–CeOx Nanocomposite Electrocatalyst : An in Situ Electrochemical X-ray Absorption Fine Structure Study

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Title: Role of Cerium Oxide in the Enhancement of Activity for the Oxygen Reduction Reaction at Pt–CeOx Nanocomposite Electrocatalyst : An in Situ Electrochemical X-ray Absorption Fine Structure Study
Authors: Masuda, Takuya Browse this author
Fukumitsu, Hitoshi Browse this author
Fugane, Keisuke Browse this author
Togasaki, Hirotaka Browse this author
Matsumura, Daiju Browse this author
Tamura, Kazuhisa Browse this author
Nishihata, Yasuo Browse this author
Yoshikawa, Hideki Browse this author
Kobayashi, Keisuke Browse this author
Mori, Toshiyuki Browse this author
Uosaki, Kohei Browse this author →KAKEN DB
Issue Date: 10-May-2012
Publisher: American Chemical Society
Journal Title: Journal of Physical Chemistry C
Volume: 116
Issue: 18
Start Page: 10098
End Page: 10102
Publisher DOI: 10.1021/jp301509t
Abstract: In situ electrochemical X-ray absorption fine structure (XAFS) measurements were performed at the Pt L3 and Ce L3 edges of the Pt-CeOx/C catalyst, which was prepared by a combined process of precipitation and coimpregnation methods, as well as at the Pt L3 edge of the conventional Pt/C catalyst in oxygen-saturated H2SO4 solution to clarify the role of CeOx in the reduction of the overpotential for the oxygen reduction reaction (ORR) at the Pt-CeOx nanocomposite compared with the conventional Pt/C catalyst. XAFS measurements clearly show that the enhancement of ORR activity is attributed to the inhibition of Pt oxide formation by the CeOx layer, of which Ce3+ was oxidized to Ce4+ instead of Pt at the Pt oxide formation potential.
Type: article
URI: http://hdl.handle.net/2115/50204
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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