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Visible light induced HCl splitting over the hetero-system p-CuCrO2/n-WO3

Author

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  • Ketir, W.
  • Trari, M.
  • Bessekhouad, Y.

Abstract

The chloride oxidation is successfully carried out on CuCrO2/WO3 (1/1) dispersed in air-equilibrated KCl solution. The delafossite CuCrO2 is p type semiconductor characterized by an optical gap of 1.28 eV, properly matched to the sun spectrum, and a chemical stability over the whole pH range. By contrast, WO3 is stable only in neutral solution and has a valence band with a potential of 2.30 VSCE. The present hetero-system is twofold, the Cl− oxidation and the hydrogen production respectively on WO3 and CuCrO2 connected in a short circuited configuration via the electrolytic solution. A chloride elimination of 60% is achieved and the oxidation obeys to a first order kinetic with a rate constant of 0.17 h−1 and a quantum yield of 1.1%. The reaction is followed by amperometry at a rotating disk electrode. The water reduction takes place by photoelectrons located in CuCrO2–CB (−1.13 VSCE) with a rate liberation of 6.5 μmol/mg (catalyst)/min and a quantum yield of 0.2%. The system is evaluated for the chemical storage through the HCl photo-splitting (2H2O + 2 KCl → 2KOH + Cl2 + H2, ΔG° = 422.2 kJ mol−1).

Suggested Citation

  • Ketir, W. & Trari, M. & Bessekhouad, Y., 2014. "Visible light induced HCl splitting over the hetero-system p-CuCrO2/n-WO3," Renewable Energy, Elsevier, vol. 69(C), pages 1-6.
    • Handle: RePEc:eee:renene:v:69:y:2014:i:c:p:1-6
    DOI: 10.1016/j.renene.2014.03.021
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    Keywords

    Chloride; Delafossite CuCrO2; WO3; Hydrogen; Chemical storage;
    All these keywords.

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