Theoretical study of tetrahedral site occupation by hydrogen in Pd nanoparticles

Takayoshi Ishimoto, Michihisa Koyama

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    To understand the enhanced effects and new hydrogen absorption properties of metal nanoparticles, we theoretically investigated the hydrogen absorption in Pd nanoparticles, adopting the Pd405 model of ca. 2.5 nm by using density functional theory. Pd405 showed inhomogeneous geometric features, especially near the surface region. The hydrogen absorptions in octahedral (O) and tetrahedral (T) sites near the core region were stable and unstable, respectively, similar to the Pd bulk. We clearly demonstrated the possibility of hydrogen absorption in T sites near the surface of Pd405. The flexible volume change and the difference in hydrogen position relative to the center of mass of the T site that we observed are important factors for stable hydrogen absorption in T sites of Pd nanoparticles. In addition, we discuss the differences in hydrogen diffusion mechanisms in the core and near surface regions, based on the stability of hydrogen absorption in O and T sites.

    Original languageEnglish
    Article number034705
    JournalJournal of Chemical Physics
    Volume148
    Issue number3
    DOIs
    Publication statusPublished - Jan 21 2018

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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