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Title: In situ study of an oxidation reaction on a Pt/C electrode by ambient pressure hard X-ray photoelectron spectroscopy

We have constructed an ambient pressure X-ray photoelectron spectroscopy instrument that uses hard X-ray radiation at the high-performance undulator beamline BL36XU of SPring-8. The dependence of the Au 4f peak intensity from Au foil on the ambient N{sub 2} pressure was measured. At a photon energy of 7.94 keV, the Au 4f peak intensity maintained 40% at 3000 Pa compared with that at high vacuum. We designed a polymer electrolyte fuel cell that allows us to perform X-ray photoelectron spectroscopy measurements of an electrode under working conditions. The oxidized Pt peaks were observed in the Pt 3d{sub 5/2} level of Pt nanoparticles in the cathode, and the peaks clearly depended on the applied voltage between the anode and cathode. Our apparatus can be applied as a valuable in situ tool for the investigation of the electronic states and adsorbed species of polymer electrolyte fuel cell electrode catalysts under the reaction conditions.
Authors:
; ;  [1] ;  [2] ;  [1] ; ; ; ; ; ;  [3] ; ;  [4] ;  [3] ;  [5] ;  [6]
  1. Department of Molecular Structure, Institute for Molecular Science, Myodaiji-cho, Okazaki, Aichi 444-8585 (Japan)
  2. (SOKENDAI), Myodaiji-cho, Okazaki, Aichi 444-8585 (Japan)
  3. Japan Synchrotron Radiation Research Institute, SPring-8, Koto, Sayo, Hyogo 679-5198 (Japan)
  4. Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofugaoka, Chofu, Tokyo 182-8585 (Japan)
  5. (Japan)
  6. Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 (Japan)
Publication Date:
OSTI Identifier:
22350784
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CATALYSTS; ELECTRIC POTENTIAL; FOILS; HARD X RADIATION; KEV RANGE; NANOPARTICLES; OXIDATION; PROTON EXCHANGE MEMBRANE FUEL CELLS; SPRING-8 STORAGE RING; WIGGLER MAGNETS; WORKING CONDITIONS; X-RAY PHOTOELECTRON SPECTROSCOPY