期刊
APPLIED PHYSICS LETTERS
卷 105, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4897007
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资金
- Polymer Electrolyte Fuel Cell Program from the New Energy and Industrial Technology Development Organization (NEDO)
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-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(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. (C) 2014 AIP Publishing LLC.
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