@article{oai:repo.qst.go.jp:00047984,
 author = {Cui, Yitao and Harada, Yoshihisa and Hatanaka, Tatsuya and Nakamura, Naoki and Ando, Masaki and Yoshida, Toshihiko and Ikenaga, Eiji and Ishii, Kenji and Matsumura, Daiju and Li, Rui and Oshima, Masaharu and 石井 賢司},
 issue = {8},
 journal = {ECS Transactions},
 month = {Oct},
 note = {The electronic structures of Pt and Pt-Co nanoparticles with O2 adsorption and O2/H2O co-adsorption were investigated by in situ hard X-ray photoelectron spectroscopy (HAXPES) and in situ high resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) to clarify the effects of water adsorption on fuel cell cathode catalysis surface. The experimental results suggest that under the pressure of 1 mbar, the adsorption of H2O hinders the successive O2 adsorption on Pt surface, while under the pressure of 1 bar, the adsorption of H2O enhances the adsorption of O2 on Pt surface. This water effect is found to be more significant on Pt surface than on Pt-Co surface. These results would be helpful to understand how the water affects the fuel cell performance and why Pt-Co nanoparticles show higher oxygen reduce reaction (ORR) activity than Pt nanoparticles.},
 pages = {131--136},
 title = {Electronic Structure of Pt and Pt-Co Nanoparticles with O2 and O2/H2O Adsorption Revealed by In Situ XAFS and Hard X-ray Photoelectron Spectroscopy},
 volume = {72},
 year = {2016}
}