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Photoassisted hydrogen evolution over spinel CuM2O4 (M=Al, Cr, Mn, Fe and Co)

Author

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  • Saadi, S.
  • Bouguelia, A.
  • Trari, M.

Abstract

The photocatalytic ability of CuM2O4 (M=Al, Cr, Mn, Fe and Co) crystallizing with spinel-type structure has been evaluated according to the H2-evolution. The oxides are black and displayed a semiconducting behavior where the electronic balance comes from a small over stochiometry (CuCo2O4.016). Electron hopping occurs between similar sites in normal spinel with a low activation energy whereas larger energies were found in inverse spinel. The electrodes were characterized photoelectrochemically and acquired the characteristic of p-type semiconductors. The conduction band edge, determined from intensity–potential curves, is located below the H2O/H2 potential leading to a thermodynamically favorable H2-liberation under visible light. The photoactivity was dependent on preparative conditions and the best results were obtained over CuCo2O4 prepared through nitrate route in presence of SO32− (3.6mlh−1g−1). Improved photoactivity may be interpreted in terms of flat band potential and electronegativity. The presence of cobalt contributes to increase the electron affinity, a desirable property for p-type specimen. It has been observed that the amount of evolved H2 rose using stronger reductors by increasing the band bending. The initial performance of catalyst was almost restored using a fresh reactant solution. With time, the water reduction slowed down because the end products Sn2- and S2O62− compete with the adsorbed water for the photoelectrons.

Suggested Citation

  • Saadi, S. & Bouguelia, A. & Trari, M., 2006. "Photoassisted hydrogen evolution over spinel CuM2O4 (M=Al, Cr, Mn, Fe and Co)," Renewable Energy, Elsevier, vol. 31(14), pages 2245-2256.
  • Handle: RePEc:eee:renene:v:31:y:2006:i:14:p:2245-2256
    DOI: 10.1016/j.renene.2005.10.014
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    Cited by:

    1. 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.
    2. Yan, Jianhui & Yang, Haihua & Tang, Yougen & Lu, Zhouguang & Zheng, Shuqin & Yao, Maohai & Han, Yong, 2009. "Synthesis and photocatalytic activity of CuYyFe2−yO4–CuCo2O4 nanocomposites for H2 evolution under visible light irradiation," Renewable Energy, Elsevier, vol. 34(11), pages 2399-2403.

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