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Issue 31, 2014
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The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1−xGaxS2 nanocrystals

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Abstract

We report on the photocatalytic hydrogen evolution under full-arc light irradiation of CuIn1−xGaxS2 wurtzite nanocrystals in the presence of SO32− and S2− as sacrificial reagents. We analyzed the hydrogen generation rate as a function of the Ga content and associated it with the energy band positions. For photocatalytic water splitting, the CuInS2 bandgap is slightly too low to efficiently overcome the reaction over-potential. The presence of Ga shifts up the CuInS2 conduction band edge providing a larger driving force for photogenerated carriers to activate the water splitting reduction reaction. The larger the Ga content, the more energetically favorable the electron injection, and thus a more efficient use of the photogenerated carriers is reached. However, the band gap increase associated with the Ga incorporation reduces the concentration of photogenerated carriers available for water splitting, and consequently a lower hydrogen conversion rate is obtained for very high Ga contents. The optimum Ga concentration was experimentally found at CuIn0.3Ga0.7S2.

Graphical abstract: The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1−xGaxS2 nanocrystals

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Publication details

The article was received on 17 Mar 2014, accepted on 25 May 2014 and first published on 27 May 2014


Article type: Paper
DOI: 10.1039/C4TA01315H
Citation: J. Mater. Chem. A, 2014,2, 12317-12322
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    The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1−xGaxS2 nanocrystals

    X. Yu, X. An, A. Shavel, M. Ibáñez and A. Cabot, J. Mater. Chem. A, 2014, 2, 12317
    DOI: 10.1039/C4TA01315H

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