The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1-xGaxS2 nanocrystals

X. Yu, X. An, A. Shavel, M. Ibanez, A. Cabot, Journal of Materials Chemistry A 2 (2014) 12317–12322.

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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 SO3 2- 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.
Publishing Year
Date Published
2014-08-21
Journal Title
Journal of Materials Chemistry A
Acknowledgement
The research was supported by the European Regional Development Funds (ERDF, “FEDER Programa Competitivitat de Catalunya 2007-2013”) and the Framework 7 program under project SCALENANO (FP7-NMP-ENERGY-2011-284486).
Volume
2
Issue
31
Page
12317 - 12322
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Yu X, An X, Shavel A, Ibanez M, Cabot A. The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1-xGaxS2 nanocrystals. Journal of Materials Chemistry A. 2014;2(31):12317-12322. doi:10.1039/c4ta01315h
Yu, X., An, X., Shavel, A., Ibanez, M., & Cabot, A. (2014). The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1-xGaxS2 nanocrystals. Journal of Materials Chemistry A, 2(31), 12317–12322. https://doi.org/10.1039/c4ta01315h
Yu, Xuelian, Xiaoqiang An, Alexey Shavel, Maria Ibanez, and Andreu Cabot. “The Effect of the Ga Content on the Photocatalytic Hydrogen Evolution of CuIn1-XGaxS2 Nanocrystals.” Journal of Materials Chemistry A 2, no. 31 (2014): 12317–22. https://doi.org/10.1039/c4ta01315h.
X. Yu, X. An, A. Shavel, M. Ibanez, and A. Cabot, “The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1-xGaxS2 nanocrystals,” Journal of Materials Chemistry A, vol. 2, no. 31, pp. 12317–12322, 2014.
Yu X, An X, Shavel A, Ibanez M, Cabot A. 2014. The effect of the Ga content on the photocatalytic hydrogen evolution of CuIn1-xGaxS2 nanocrystals. Journal of Materials Chemistry A. 2(31), 12317–12322.
Yu, Xuelian, et al. “The Effect of the Ga Content on the Photocatalytic Hydrogen Evolution of CuIn1-XGaxS2 Nanocrystals.” Journal of Materials Chemistry A, vol. 2, no. 31, Royal Society of Chemistry, 2014, pp. 12317–22, doi:10.1039/c4ta01315h.

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