A complex perovskite-type oxynitride: The first photocatalyst for water splitting operable at up to 600 nm

Chengsi Pan, Tsuyoshi Takata, Mamiko Nakabayashi, Takao Matsumoto, Naoya Shibata, Yuichi Ikuhara, Kazunari Domen

    Research output: Contribution to journalArticle

    209 Citations (Scopus)

    Abstract

    One of the simplest methods for splitting water into H2 and O2 with solar energy entails the use of a particulate-type semiconductor photocatalyst. To harness solar energy efficiently, a new water-splitting photocatalyst that is active over a wider range of the visible spectrum has been developed. In particular, a complex perovskite-type oxynitride, LaMgxTa1-xO1+3xN2-3x (x ≥ 1/3), can be employed for overall water splitting at wavelengths of up to 600 nm. Two effective strategies for overall water splitting were developed. The first entails the compositional fine-tuning of a photocatalyst to adjust the bandgap energy and position by forming a series of LaMgxTa1-xO1+3xN2-3x solid solutions. The second method is based on the surface coating of the photocatalyst with a layer of amorphous oxyhydroxide to control the surface redox reactions. By combining these two strategies, the degradation of the photocatalyst and the reverse reaction could be prevented, resulting in successful overall water splitting.

    Original languageEnglish
    Pages (from-to)2955-2959
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume54
    Issue number10
    DOIs
    Publication statusPublished - 2015 Mar 2

    Keywords

    • Coatings
    • Oxynitrides
    • Perovskite phases
    • Photocatalysis
    • Water splitting

    ASJC Scopus subject areas

    • Chemistry(all)
    • Catalysis

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