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Updated: May 20, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Nanosize-induced drastic drop in equilibrium hydrogen pressure for hydride formation and structural stabilization in
Hirokazu Kobayashi1, Hitoshi Morita, Miho Yamauchi
1Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan. hkobayashi@kuchem.kyoto-u.ac.jp
Abstract:
We have synthesized and characterized homogeneous solid-solution alloy nanoparticles of Pd and Rh, which are immiscible with each other in the equilibrium bulk state at around room temperature. The Pd-Rh alloy nanoparticles can absorb hydrogen at ambient pressure and the hydrogen pressure of Pd-Rh alloys for hydrogen storage is dramatically decreased by more than 4 orders of magnitude from the corresponding pressure in the metastable bulk state. The solid-solution state is still maintained in the nanoparticles even after hydrogen absorption/desorption, in contrast to the metastable bulks which are separated into Pd and Rh during the process.
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