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XAFS and XPS study of hydro‐/dehydrogenation reaction of Mg–Pd nanoparticles
Author(s) -
Ogawa Satoshi,
Fujimoto Taishi,
Mizutani Tsuyoshi,
Ogawa Masahiro,
Yogi Chihiro,
Kato Kazuo,
Ohta Toshiaki,
Yoshida Tomoko,
Yagi Shinya
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5647
Subject(s) - x ray photoelectron spectroscopy , x ray absorption fine structure , dehydrogenation , chemical state , alloy , chemistry , hydrogen , hydrogen storage , extended x ray absorption fine structure , evaporation , nanoparticle , metal , catalysis , inorganic chemistry , absorption spectroscopy , materials science , spectroscopy , chemical engineering , nanotechnology , organic chemistry , engineering , thermodynamics , physics , quantum mechanics
The nanoparticles composed of Mg and Pd atoms (Mg–Pd NPs) have been fabricated by the gas evaporation method, and the variation of the chemical state during hydro‐/dehydrogenations has been investigated by X‐ray photoelectron spectroscopy (XPS) and in‐situ X‐ray absorption fine structure (XAFS) analyses. Both XPS and XAFS spectra have indicated that the Mg–Pd NPs contain the chemical state of the metallic Pd and Mg–Pd alloy phases. The Mg–Pd alloy phase has been identified as MgPd and Mg 6 Pd by the Pd K‐edge EXAFS analysis. The hydrogen release of the Mg–Pd NPs has not been observed after first hydrogenation due to the migration of Mg toward the surface of the Mg–Pd NPs during the hydrogen storage. This irreversible migration has led the inhibition of the hydrogen diffusion into the surface from the inside of the Mg–Pd NPs. Copyright © 2014 John Wiley & Sons, Ltd.