Utilization of Perovskite-Type Oxynitride La0.5Sr0.5Ta0.5Ti0.5O2N as an O2-Evolving Photocatalyst in Z-Scheme Water Splitting

Hiromu Kumagai, Ryosuke Aoyagi, Kosaku Kato, Akira Yamakata, Masato Kakihana, Hideki Kato

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The particulate Z-scheme water splitting system involving a perovskite-type oxynitride as an O2-evolving photocatalyst has been first demonstrated using La0.5Sr0.5Ta0.5Ti0.5O2N accompanied by Ru-loaded SrTiO3:Rh and [Co(bpy)3]3+/2+ (bpy = 2,2′-bipyridine) as a H2-evolving photocatalyst and an electron mediator, respectively. O2 evolution was negligible when the bare oxynitride was employed. A Pt cocatalyst deposited on La0.5Sr0.5Ta0.5Ti0.5O2N promoted the reduction of [Co(bpy)3]3+ due to capturing electrons, resulting in an enhancement of O2 evolution. It has also been discovered that the [Co(bpy)3]3+/2+ electron mediator suppresses water formation over Pt particles.

    Original languageEnglish
    Pages (from-to)2056-2060
    Number of pages5
    JournalACS Applied Energy Materials
    Volume4
    Issue number3
    DOIs
    Publication statusPublished - 2021 Mar 22

    Keywords

    • Z-scheme system
    • perovskite-type oxynitride
    • photocatalyst
    • visible light response
    • water splitting

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Energy Engineering and Power Technology
    • Electrochemistry
    • Electrical and Electronic Engineering
    • Materials Chemistry

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