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Issue 27, 2015
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Improvement of hydrogen evolution under visible light over Zn1−2x(CuGa)xGa2S4 photocatalysts by synthesis utilizing a polymerizable complex method

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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.

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

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Publication details

The article was received on 23 Mar 2015, accepted on 31 May 2015 and first published on 01 Jun 2015


Article type: Paper
DOI: 10.1039/C5TA02114F
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J. Mater. Chem. A, 2015,3, 14239-14244

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

    C. S. Quintans, H. Kato, M. Kobayashi, H. Kaga, A. Iwase, A. Kudo and M. Kakihana, J. Mater. Chem. A, 2015, 3, 14239
    DOI: 10.1039/C5TA02114F

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