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

doi:10.1039/c5ta02114f

Improvement of hydrogen evolution under visible light over Zn_1-2x(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

IMRAM - Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Single phase Zn_1-2x(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, Zn_0.4(CuGa)_0.3Ga₂S₄ (x = 0.3) showed the highest activity for H₂ evolution from an aqueous solution containing S^2- and SO₃^2- 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 Zn_0.4(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 language	English
Pages (from-to)	14239-14244
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	27
DOIs	https://doi.org/10.1039/c5ta02114f
Publication status	Published - 2015 Jul 21

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

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.",

author = "Quintans, {Ciro Scheremeta} and Hideki Kato and Makoto Kobayashi and Hiroshi Kaga and Akihide Iwase and Akihiko Kudo and Masato Kakihana",

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year = "2015",

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doi = "10.1039/c5ta02114f",

language = "English",

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T1 - Improvement of hydrogen evolution under visible light over Zn1-2x(CuGa)xGa2S4 photocatalysts by synthesis utilizing a polymerizable complex method

AU - Quintans, Ciro Scheremeta

AU - Kato, Hideki

AU - Kobayashi, Makoto

AU - Kaga, Hiroshi

AU - Iwase, Akihide

AU - Kudo, Akihiko

AU - Kakihana, Masato

PY - 2015/7/21

Y1 - 2015/7/21

N2 - 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.

AB - 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.

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DO - 10.1039/c5ta02114f

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JO - Journal of Materials Chemistry A

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Improvement of hydrogen evolution under visible light over Zn_1-2x(CuGa)_xGa₂S₄ photocatalysts by synthesis utilizing a polymerizable complex method

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