Undoped Layered Perovskite Oxynitride Li2LaTa2O6N for Photocatalytic CO2 Reduction with Visible Light

Takayoshi Oshima, Tom Ichibha, Ken Sinkou Qin, Kanemichi Muraoka, Junie Jhon M. Vequizo, Keisuke Hibino, Ryo Kuriki, Shunsuke Yamashita, Kenta Hongo, Tomoki Uchiyama, Kotaro Fujii, Daling Lu, Ryo Maezono, Akira Yamakata, Hideki Kato, Koji Kimoto, Masatomo Yashima, Yoshiharu Uchimoto, Masato Kakihana, Osamu IshitaniHiroshi Kageyama, Kazuhiko Maeda

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    Oxynitrides are promising visible-light-responsive photocatalysts, but their structures are almost confined with three-dimensional (3D) structures such as perovskites. A phase-pure Li2LaTa2O6N with a layered perovskite structure was successfully prepared by thermal ammonolysis of a lithium-rich oxide precursor. Li2LaTa2O6N exhibited high crystallinity and visible-light absorption up to 500 nm. As opposed to well-known 3D oxynitride perovskites, Li2LaTa2O6N supported by a binuclear RuII complex was capable of stably and selectively converting CO2 into formate under visible light (λ>400 nm). Transient absorption spectroscopy indicated that, as compared to 3D oxynitrides, Li2LaTa2O6N possesses a lower density of mid-gap states that work as recombination centers of photogenerated electron/hole pairs, but a higher density of reactive electrons, which is responsible for the higher photocatalytic performance of this layered oxynitride.

    Original languageEnglish
    Pages (from-to)8154-8158
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume57
    Issue number27
    DOIs
    Publication statusPublished - 2018 Jul 2

    Keywords

    • CO reduction
    • oxynitride
    • perovskites
    • photocatalysis
    • visible light

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)

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