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Synthesis, physical and electrochemical characterizations of organically templated cobalt-aluminophosphate. Application to oxygen evolution

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Abstract

The hybrid semiconductor CYCHA-CoAl2P3O12·mH2O was elaborated by hydrothermal route at 453 K in presence of cyclohexylamine (CYCHA) as organic template. The X-ray diffraction pattern of the blue product indicates a zeolite type CAP-CHA 5 topology which crystallizes in a hexagonal system (SG:R\( \overline{3} \)) with the lattice constants: a = 13.5494 (3) Å, c = 15.2795 (5) Å. The optical, physical and photo-electrochemical characterizations of the material were investigated. The diffuse reflectance indicates an optical transition at 1.84 eV, directly allowed due to the crystal field splitting of Co 3+ in tetrahedral coordination. The electrical conduction occurs by low polaron hopping with activation energy of 37 meV. The conduction band is formed by Co3+: e.g. orbital (5.15 eV) below vacuum. The valence band, deriving mostly from O2−: 2p orbital with a potential (6.85 eV), is adequately located with respect to O2/H2O level (~ 1.40 VSCE), thus leading to an oxidation of water under illumination. The best photoactivity was found at neutral pH (~ 7) with an oxygen evolution rate of 38 µmol min−1 g−1 and a quantum yield of 0.40%. The as-synthesized material also showed adsorption capacity of 90% of the methyl violet dye in aqueous solution with a half life of 43 min.

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Authors and Affiliations

  1. Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    R. Bagtache & K. Abdmeziem

  2. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    G. Rekhila & M. Trari

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  1. R. Bagtache
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  2. K. Abdmeziem
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  3. G. Rekhila
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  4. M. Trari
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Correspondence to R. Bagtache or M. Trari.

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Bagtache, R., Abdmeziem, K., Rekhila, G. et al. Synthesis, physical and electrochemical characterizations of organically templated cobalt-aluminophosphate. Application to oxygen evolution. J Mater Sci: Mater Electron 30, 14928–14934 (2019). https://doi.org/10.1007/s10854-019-01865-1

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