Development of operando cell with membrane for "in-situ" observations of electronic states in chemical reactions

• Project/Area Number: 26390120
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Ikenaga Eiji 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 研究員 (90443548)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥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)
• Keywords: 硬Ｘ線光電子分光 / 湿潤環境 / 化学反応 / 雰囲気制御セル / 固‐気界面 / 固‐液界面 / Operando計測 / 固気・固液界面 / 光電子透過窓

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.

Research Products

• [Journal Article] In Situ Hard X-ray Photoelectron Study of O2 and H2O Adsorption on Pt Nanoparticles (2016)
  • Author(s): Y. Cui, Y. Harada, E.Ikenaga, R. Li, N. Nakamura, T. Hatanaka, M. Ando, T. Yoshida, G.-Ling Li, and M. Oshima
  • Journal Title: J. Phys. Chem. C Volume: 120 Pages: 10936-10940
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] “その場”観測のための光電子透過窓を用いた 溶液セルの開発 (2016)
  • Author(s): 池永英司
  • Organizer: 第29回日本放射光学会
  • Place of Presentation: 東京大学柏の葉キャンパス駅前サテライト（千葉県柏市）
  • Year and Date: 2016-01-09
• [Presentation] 化学反応“その場”観測のための光電子透過窓を用いた 循環型制御セルの開発 (2015)
  • Author(s): 池永英司
  • Organizer: 第28回日本放射光学会
  • Place of Presentation: 立命館大学 びわこ・くさつキャンパス（滋賀県草津市）
  • Year and Date: 2015-01-10 – 2015-01-12