Visible light-induced hydrogen over CuFeO2 via S2O3 oxidation |
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Authors: | M Younsi A Aider A Bouguelia M Trari |
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Affiliation: | Faculté de Chimie, Laboratoire de Stockage et de Valorisation des Energies Renouvelables, des Energies Renouvelables, USTHB BP 32, Algiers, Algeria |
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Abstract: | The properties of CuFeO2 have been studied according to the catalytic hydrogen production upon visible light. CuFeO2 with a low band gap Eg, a good chemical stability and a suitable flat band potential appears as a suitable candidate. The potential of photoelectrons allows favorably a thermodynamically H2-evolution from alkaline thiosulfate S2O32− solution. There is a major difference between pure and loaded oxide with some metal catalysts. Our best results have been obtained with unloaded CuFeO2 at 50 °C and pH 13.60. Thiosulfate S2O32− ions can be oxidized to sulfite SO32− and subsequently to sulfate SO42− and the electronic exchange occurs via mediation of surface states. The quite high H2-formation at the beginning shows a tendency towards saturation, it competes with SO32− produced by parallel oxidation of S2O32−. |
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Keywords: | Catalyst Hydrogen Thiosulfate CuFeO2 |
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