• Photocatalytic generation of hydrogen under visible light on La2CuO4

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/038/04/1043-1048

    • Keywords

       

      La2CuO4; optical transition; photo-electrochemical; electrochemical impedance spectroscopy; hydrogen.

    • Abstract

       

      The semiconducting properties of La2CuO4 prepared by a chemical route are investigated for the first time by the photo-electrochemical technique. The optical gap is found to be 1.27 eV and the transition is directly allowed. p-Type conductivity is demonstrated from the Mott–Schottky plot in alkaline KOH solution (0.1 M), extrapolation of the linear region to the potential axis gives a flat band potential of −0.41 VSCE, a holes density of 1.75 × 1019 cm−3 and a space-charge region of 18 nm. The electrochemical impedance spectroscopy, measured over the frequency range (1 mHz–105 Hz), reveals the predominance of the bulk contribution with a constant phase element. The energy diagram shows the feasibility of La2CuO4 for the H2 evolution under visible light. The best performance occurs at pH 12.5 in the presence of S2O$^{2-}_{3}$ as holes scavenger. A liberation rate of 20.6 𝜇mol mn−1 (g catalyst)−1 is obtained under full light (29 mW cm−2).

    • Author Affiliations

       

      H Lahmar1 M Trari1

      1. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB), B.P. 32, 16111 Algiers, Algeria
    • Dates

       

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