Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

K. Edalati, I. Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, T. Akbay, Tatsumi Ishihara, Masayoshi Fuji, Z. Horita

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Alumina is an insulator oxide with a large abundance in the earth's crust, but it shows no photocatalytic activity due to its large bandgap (9 eV). Based on first-principles calculations, the Al2O3 bandgap can be reduced below 3 eV, if large oxygen vacancies are generated. Here, Al2O3 with large oxygen vacancy concentrations and ~2.5 eV optical bandgap is produced by severe plastic deformation via the high-pressure torsion (HPT) method. The material exhibits photocatalytic dye degradation with a reasonable rate compared with TiO2 photocatalysis. This finding introduces a simple but effective approach to produce new nature-friendly photocatalysts even from insulator oxides.

    Original languageEnglish
    Pages (from-to)120-124
    Number of pages5
    JournalScripta Materialia
    Volume173
    DOIs
    Publication statusPublished - Dec 2019

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys

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