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Photoelectrochemical H2-generation over Spinel FeCr2O4 in X2- solutions (X2-Â =Â S2- and )

Author

Listed:
  • Boudjemaa, A.
  • Bouarab, R.
  • Saadi, S.
  • Bouguelia, A.
  • Trari, M.

Abstract

Photocatalytic H2-production has been observed over FeCr2O4, synthesized from Cr(NO3)3 and Fe(NO3)3. The oxide crystallizes in the normal spinel structure and the transport properties exhibit p-type conductivity ascribed to metal deficiency. An optical gap of 1.33 eV is determined from the reflectance diffuse spectrum. From photoelectrochemical measurements, a flat band potential of +0.23 VSCE is found. The valence band, made up of cationic 3d orbital, is located at 5.2 eV (0.45 VSCE) below vacuum. Hence, the conduction band (-0.98 VSCE) allows a thermodynamically feasible H2 liberation under visible light. In aqueous electrolytes, the oxide is stabilized by hole consumption involving X2- species and the best photoactivity for H2-production is obtained in S2- solution with an evolution rate of 8.26 cm3 g-1 h-1. The tendency towards saturation is due to the competitive reduction of the end products namely and with water and to the yellow color of . On the other hand and for a comparative purpose, the catalytic activity of unreduced FeCr2O4 for the water-gas shift reaction (CO + H2O --> CO2 + H2) is studied in the temperature range 523-723 K. At 723 K, the rate of H2-formation and the degree of CO conversion are respectively 280 [mu]mol g-1 s-1 and 44%.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:7-8:p:1080-1086
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. 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.
    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.

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