High photocatalytic performance for hydrogen production under visible light on the hetero-junction Pani-ZnO nanoparticles |
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Authors: | C. Belabed A. Tab B. Bellal B. Belhamdi N. Benrakaa M. Trari |
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Affiliation: | 1. Laboratory of Materials Physic, Faculty of Physic, USTHB, BP 32, 16111, Algiers, Algeria;2. Laboratory of Chromatography, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria;3. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, U.S.T.H.B, BP 32, 16111, Algiers, Algeria;4. Department of Matter Sciences, Faculty of Sciences, University of Algiers 1 Benyoucef Benkhedda, 16002, Algiers, Algeria |
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Abstract: | The present work is devoted to the preparation of the hetero-junction of Polyaniline-Zinc oxide nanoparticles (Pani-ZnONps) and its photo-electrochemistry to assess its photocatalytic properties for the water reduction into hydrogen. The semiconducting characterization of the Pani-ZnONps synthetized by in situ chemical oxidative polymerization was studied for the hydrogen evolution reaction (HER) upon visible light illumination. The forbidden bands Eg (= 1.64 eV, Pani) and (3.20 eV, ZnONPS) were extracted from the UV–Visible diffuse reflectance data. The Electrochemical Impedance Spectroscopy (EIS) showed the predominance of the intrinsic material with a bulk impedance of 71 kΩ cm2. The semi conductivity was demonstrated by the capacitance measurements with flat band potentials (Efb = - 0.7 and - 0.3 VSCE) and carriers concentrations (NA = 1.77 × 1019 and ND = 4.80 × 1020 cm?3) respectively for Pani and ZnONPS. The energetic diagram of the hetero-junction Pani-ZnONps predicts electrons injection from Pani to ZnONPS in KOH electrolyte. An improvement of 78% for the evolved hydrogen was obtained, compared to Pani alone; a liberation rate of 61.16 μmol g?1 min?1 and a quantum yield of 1.15% were obtained. More interestingly, the photoactivity was fully restored after three consecutive cycles with a zero-deactivation effect, indicating clearly the reusability of the catalyst over several cycles. |
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Keywords: | Polyaniline (Pani) Photo-electrochemical Hydrogen Visible light irradiation |
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