Important Role of Cerium Oxide in Oxygen Reduction Reaction at Pt-CeOx Nanocomposite Electrocatalyst Studied by in situ Electrochemical XAFS

T. Masuda, H. Fukumitsu, K. Fugane, H. Togasaki, D. Matsumura, K. Tamura, Y. Nishihata, H. Yoshikawa, K. Kobayashi, T. Mori, and K. Uosaki Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), Tsukuba 3050044, Japan Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan Synchrotron X-ray Station at SPring-8, National Institute for Materials Science (NIMS), Sayo, Hyogo 679-5148, Japan International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan