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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

Author:
Masuda, Takuya  Fukumitsu, Hitoshi  Fugane, Keisuke  Togasaki, Hirotaka  Matsumura, Daiju  Tamura, Kazuhisa  Nishihata, Yasuo  Yoshikawa, Hideki  Kobayashi, Keisuke  Mori, Toshiyuki  Uosaki, Kohei  


Journal:
JOURNAL OF PHYSICAL CHEMISTRY C


Issue Date:
2012


Abstract(summary):

In situ electrochemical X-ray absorption fine structure (XAFS) measurements were performed at the Pt L-3 and Ce L-3 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 L-3 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.


Page:
10098---10102


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