Enhancing photocatalytic activity of LaTiO2N by removal of surface reconstruction layer

Michinori Matsukawa, Ryo Ishikawa, Takashi Hisatomi, Yosuke Moriya, Naoya Shibata, Jun Kubota, Yuichi Ikuhara, Kazunari Domen

    Research output: Contribution to journalArticlepeer-review

    89 Citations (Scopus)

    Abstract

    LaTiO2N is an oxynitride photocatalyst that has ability to generate H2 and O2 from water under irradiation of light with wavelengths up to 600 nm. However, LaTiO2N necessitates sacrificial reagents that capture either photoexcited electrons or holes efficiently to be active in the photocatalytic reactions because of a considerable number of defects that cause trapping and recombination of photoexcited carriers. Therefore, identifying defect structures of LaTiO 2N is important. In this study, using atomic-resolution scanning transmission electron microscopy, we evidence that eliminating defective surface reconstructed layers of LaTiO2N particles by the treatment with aqua regia can double the photocatalytic activity.

    Original languageEnglish
    Pages (from-to)1038-1041
    Number of pages4
    JournalNano Letters
    Volume14
    Issue number2
    DOIs
    Publication statusPublished - 2014 Feb 12

    Keywords

    • Water splitting
    • acid etching
    • atomic-resolution STEM
    • oxynitride
    • surface reconstruction

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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