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Role of cerium oxide in the enhancement of activity for the oxygen reduction reaction at Pt-CeO$$_{x}$$ nanocomposite electrocatalyst; An in situ electrochemical X-ray absorption fine structure study

Pt-CeO$$_{x}$$ナノ複合触媒上での酸素還元反応に関するCeO$$_{x}$$の役割に関する研究

増田 卓也*; 福満 仁志*; 府金 慶介*; 戸ヶ崎 寛孝*; 松村 大樹; 田村 和久; 西畑 保雄; 吉川 英樹*; 小林 啓介*; 森 利之*; 魚崎 浩平*

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

Pt-CeO$$_{x}$$/C触媒上での酸素還元反応におけるCeO$$_{x}$$の役割をXAFS法を用い調べた。その結果、CeO$$_{x}$$中のCe$$^{3+}$$がCe$$^{4+}$$になることによりPt酸化物生成が抑制されることがわかった。

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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パーセンタイル:6.63

分野:Chemistry, Physical

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