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

Masataka Hakamada; Toshiyuki Furukawa; Tao Yamamoto; Masaki Takahashi; Mamoru Mabuchi

doi:10.2320/matertrans.M2010403

Masataka Hakamada, Toshiyuki Furukawa, Tao Yamamoto, Masaki Takahashi, Mamoru Mabuchi

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Keywords: hydride, platinum, nanoporous, surface strain

JOURNAL FREE ACCESS

2011 Volume 52 Issue 4 Pages 806-809

DOI https://doi.org/10.2320/matertrans.M2010403

View "Advance Publication" version (March 2, 2011).

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Abstract

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.

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