Improvement of hydrogen evolution under visible light over Zn1-2x(CuGa)xGa2S4 photocatalysts by synthesis utilizing a polymerizable complex method

Ciro Scheremeta Quintans, Hideki Kato, Makoto Kobayashi, Hiroshi Kaga, Akihide Iwase, Akihiko Kudo, Masato Kakihana

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    9 Citations (Scopus)

    Abstract

    Single phase Zn1-2x(CuGa)xGa2S4 was successfully synthesized by a two-step route: synthesis of an oxide precursor by a polymerizable complex (PC) method followed by sulfurization under a H2S-Ar flow. The samples thus obtained were porous aggregates consisting of fine crystals with 50 nm size. Among the examined compositions, Zn0.4(CuGa)0.3Ga2S4 (x = 0.3) showed the highest activity for H2 evolution from an aqueous solution containing S2- and SO32- as electron donors under visible light irradiation. The apparent quantum yield of the optimized sample with deposition of 2 wt% of Rh was 19% at 420 nm. This value is higher than that of the sample synthesized by a solid state reaction (15%). Therefore, improvement of the photocatalytic performance of Zn0.4(CuGa)0.3Ga2S4 for H2 evolution has been achieved by using the two-step synthesis method including the preparation of an oxide precursor by the PC method.

    Original languageEnglish
    Pages (from-to)14239-14244
    Number of pages6
    JournalJournal of Materials Chemistry A
    Volume3
    Issue number27
    DOIs
    Publication statusPublished - 2015 Jul 21

    ASJC Scopus subject areas

    • Chemistry(all)
    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

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