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Photoassisted hydrogen production under visible light over NiO/ZnO hetero-system

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  • Belhadi, A.
  • Boumaza, S.
  • Trari, M.

Abstract

Visible light driven water reduction is successfully achieved over the novel hetero-system NiO/ZnO. The capacitance measurement (C−2–V) of NiO exhibits a positive slope, characteristic of n type conductivity, from which a flat band potential of −0.80 VSCE and a density of 1.41×1018cm−3 are obtained. The correlation of the energy levels indicates that the photo electrons react with adsorbed H2O molecules via ZnO interfacial mechanism. Two NiO compositions (4% and 10%) onto ZnO support are prepared by the impregnation technique. The electrons generated upon visible light in the conduction band of NiO, anchored uniformly on ZnO, diffuse to the interface for achieving the water reduction. NiO is photoelectrochemically stable by hole consumption reactions involving S2O32- as sacrificial agent. The best performance is obtained in basic media on NiO (4%) with an evolution rate of 435μmolh−1 (mgcatalyst)−1 and a quantum efficiency of 0.3%. The hetero-system has the thermodynamically force to drive the uphill reaction (S2O32-+H2O+2OH-→2SO32-+2H2,ΔGf∘=101.04kJmol-1).

Suggested Citation

  • Belhadi, A. & Boumaza, S. & Trari, M., 2011. "Photoassisted hydrogen production under visible light over NiO/ZnO hetero-system," Applied Energy, Elsevier, vol. 88(12), pages 4490-4495.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4490-4495
    DOI: 10.1016/j.apenergy.2011.05.044
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    References listed on IDEAS

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    1. Wang, Jinsheng & Anthony, Edward J., 2008. "Clean combustion of solid fuels," Applied Energy, Elsevier, vol. 85(2-3), pages 73-79, February.
    2. Boumaza, S. & Boudjemaa, A. & Bouguelia, A. & Bouarab, R. & Trari, M., 2010. "Visible light induced hydrogen evolution on new hetero-system ZnFe2O4/SrTiO3," Applied Energy, Elsevier, vol. 87(7), pages 2230-2236, July.
    3. Neef, H.-J., 2009. "International overview of hydrogen and fuel cell research," Energy, Elsevier, vol. 34(3), pages 327-333.
    4. Boudjemaa, A. & Bouarab, R. & Saadi, S. & Bouguelia, A. & Trari, M., 2009. "Photoelectrochemical H2-generation over Spinel FeCr2O4 in X2- solutions (X2-Â =Â S2- and )," Applied Energy, Elsevier, vol. 86(7-8), pages 1080-1086, July.
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