Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.806-809
© 2011 The Japan Institute of Metals

Abnormal Hydrogen Absorption/Desorption Properties of Nanoporous Pt with Large Lattice Strains

Masataka Hakamada1, Toshiyuki Furukawa1, Tao Yamamoto2, Masaki Takahashi1 and Mamoru Mabuchi1

1Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan
2Undergraduate School of Global Engineering, Faculty of Engineering, Kyoto University, Kyoto 606-8501, Japan

Hydrogen absorption/desorption properties of nanoporous Pt fabricated by dealloying were investigated. At high pressure (> 1.3 MPa), the nanoporous Pt released hydrogen during hydrogen pressurization; in contrast, it absorbed hydrogen up to 3.5 atom% during hydrogen depressurization, which have not been seen in current metal/hydride systems including nanoparticles. First-principles calculations suggested that the abnormal hydrogen absorption/desorption properties are due to the relaxation/preservation of the lattice strain in Pt hydride.

(Received 2010/12/3; Accepted 2011/1/17; Published 2011/3/2)

Keywords: hydride, platinum, nanoporous, surface strain

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