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- W2912579723 abstract "Abstract This study was undertaken to assess the potentiality of the hetero-junction p-CuO/Al2O3 (20/80) for the photochemical hydrogen liberation. The catalysts, synthetized by nitrate route at 400 °C, were characterized by thermal analysis, X-ray diffraction, electrical properties and photo-electrochemistry. The hetero-junction was synthesized at 400 °C, to preclude the formation of the spinel CuAl2O4. A forbidden band of ∼1.32 eV was determined from the diffuse reflectance of CuO. The capacitance-potential (C−2 – E) plot, plotted at neutral (pH ∼ 7) is characteristic of p-type behavior with a flat band of +0.60 VSCE. Therefore, the potential of the conduction band (CB) of CuO (−0.42 VSCE), made up mostly from Cu2+: eg orbital, is more cathodic than that of H2 level, leading to the feasibility of H2 evolution upon visible light illumination (2.09 × 1019 photons/s). The best performance with H2-liberation rate of 68 μmol (g catalyst)−1 min−1 was obtained in NaOH electrolyte (0.1 M) in presence of S2O32− (10−2 M) as sacrificial agent, leading to a quantum efficiency of 0.37%. More interestingly, the photoactivity was improved during the second cycle." @default.
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- W2912579723 date "2019-08-01" @default.
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- W2912579723 title "A new hetero-junction p-CuO/Al2O3 for the H2 evolution under visible light" @default.
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- W2912579723 doi "https://doi.org/10.1016/j.ijhydene.2019.01.109" @default.
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