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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–CeO x /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 H 2 SO 4 solution to clarify the role of CeO x in the reduction of the overpotential for the oxygen reduction reaction (ORR) at the Pt–CeO x 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 CeO x layer, of which Ce 3+ was oxidized to Ce 4+ instead of Pt at the Pt oxide formation potential.
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Masuda et al. (2012) studied this question.
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