Preparation,characterization and electronic properties of LaFeO3 perovskite as photocatalyst for hydrogen production |
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| Affiliation: | 1. Laboratory of Natural Gas Chemistry, Faculty of Chemistry, USTHB, BP32, 16111 Algiers, Algeria;2. Laboratoire LCPMM, Faculté des Sciences, Université Blida 1, B.P 270, Route de Soumaa, Blida, Algeria;3. Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, (USTHB), BP 32, 16111, Algiers, Algeria;4. Laboratory of Storage and Valorization of Renewable Energy, Faculty of Chemistry, USTHB, BP32, 16111 Algiers, Algeria;1. Department of Chemistry, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran;2. Young Research Society, Shahid Bahonar University of Kerman, Kerman, Iran;1. Department of Physics, Faculty of Art and Sciences, Cukurova University, Adana, Turkey;2. Department of Chemistry, Faculty of Art and Sciences, Cukurova University, Adana, Turkey;1. Laboratory of Storage and Valorization of Renewable Energies Faculty of Chemistry, University (USTHB), B.P. 32, Algiers, Algeria;2. Research Center in Chemical and Physical Analysis (C.R.A.P.C), BP384, RP 42004, Tipaza, Algeria;3. Laboratory of Biomaterials and Transport Phenomena (LBMPT), University of Medea, Quartier Ain D''heb, 26000 Medea, Algeria;1. Centre for Nano Science and Nano Technology, SOA University, Bhubaneswar 751030, Odisha, India;2. Advanced Material Technology Department, CSIR—Institute of Mineral and Material Technology, Bhubaneswar 751013, Odisha, India;3. Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research, Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110 001, India |
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| Abstract: | Perovskite-type LaFeO3 was successfully used as photocatalyst for the H2 production. It was prepared by a conventional sol-gel technique via the nitrate route. X-Ray fluorescence/Energy Dispersive X-Ray fluorescence (XRF), X-Ray Diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), UV–Visible diffuse reflectance, FTIR spectroscopy, Scanning Electron Microscopy (SEM/EDX) and specific surface area were deployed to characterize the synthetized material after heat-treated at 850 °C. LaFeO3 crystallizes in a cubic structure (Space Group: Pm3 m) with a crystallite size of 16 nm and BET surface area of 12 m2/g. Field-dependent magnetization was measured at 300 K in the region (±25 kOe) and the perovskite exhibits a high magnetism with a saturation magnetization (0.15 emu/g). Such result indicates that the Fe-3d are in localized high spin state. LaFeO3 has a narrow band gap of 2.08 eV determined by diffuse reflectance resulting to the crystal field splitting of 3d orbital of Fe3+ octahedrally coordinated with an internal d-d transition. Cyclic voltammetry showed the reduction of adsorbed H2O molecules to gaseous hydrogen at −0.7 VSCE, a potential less cathodic than the conduction band (−0.45 VSCE). The latter was determined from the capacitance measurements in alkaline electrolyte (NaOH 0.1 M) where the perovskite exhibits a stability with an exchange current density of ∼0.4 mA cm−2. The photocatalytic activity reveals an optimal H2 production of 99 μmol after 20 min at 50 °C in NaOH medium and a catalyst mass of 50 mg, under visible light irradiation (13 W) in the presence of thiosulfate S2O32− as hole scavenger. |
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| Keywords: | Sol-gel Photoreduction Hydrogen Visible light |
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