XAFS Analysis of Pt and Pt-Ru Catalysts for PEFCs by In-Situ Measurements under Operating Conditions in the Fluorescence Mode

Journal Article · Fri Feb 02 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2644618· OSTI ID:21054705

Kageyama, Hiroyuki; Ioroi, Tsutomu; Kojima, Toshikatsu; Senoh, Hiroshi; Takeichi, Nobuhiko; Nomura, Katsuhiro; Tanimoto, Kazumi ^[1]

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1. National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577 (Japan)

In-situ X-ray absorption fine structure (XAFS) is one of powerful spectroscopic techniques to analyze valence state and chemical bonding in Pt and Pt-Ru electrocatalysts under fuel cell operating conditions. We measured Pt L3 and Ru K-XAFS of Pt and Pt-Ru electrocatalysts in fluorescence mode under different operation voltages using pure H2 or 97 ppm CO containing H2 as fuel gases that were fed to the anode. The radial structure functions that derived from the obtained XAFS spectra showed that the local structure around Pt and Ru atoms in the electrocatalysts changes depending on the operation voltage and shows difference with the existence of CO in the fuel gas.

• OSTI ID: 21054705
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 882; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
CARBON MONOXIDE
CHEMICAL BONDS
ELECTRIC POTENTIAL
ELECTROCATALYSTS
FINE STRUCTURE
FLUORESCENCE
FUEL CELLS
FUEL GAS
OPERATION
PLATINUM
RUTHENIUM
STRUCTURE FUNCTIONS
VALENCE
X-RAY SPECTRA
X-RAY SPECTROSCOPY