| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
I have developed the operando controlling cell which could keep the environment for wet sample within a high vacuum successfully and realized observation in the wet sample of the electronic states using hard X-ray photoemission spectroscopy (HAXPES) in SPring-8. To improve the efficiency of Pt-based cathode catalysts in polymer electrolyte fuel cells, understanding of the oxygen reduction process at surfaces and interfaces in the molecular level is essential. In this study with this operando cell, H2O and O2 adsorption and dissociation of the reduction process were investigated by HAXPES. Pt 5d valence band and Pt 3d, Pt 4f core HAXPES spectra of Pt nanoparticles upon H2O and O2 adsorption revealed that H2O adsorption has negligible effect on the electronic structure of Pt, while O2 adsorption has significant effect, reflecting the weak and strong chemisorption of H2O and O2 on the Pt nanoparticle, respectively.
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