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<p>Hydrogen is a clean and sustainable energy source, making the development of efficient production technologies essential for meeting global energy demands and mitigating carbon emissions. In this study, the optical and photo-electrochemical properties of CoFe<sub>2</sub>O<sub>4</sub> (CFO) nanoparticles have been investigated, highlighting their effectiveness in hydrogen generation. CFO was synthesized using the wet method and formed at 700&#xa0;°C, the spinel was identified by X-ray diffraction (XRD), FTIR spectroscopy, Raman, and X-ray photoelectron spectroscopy (XPS). The XRD pattern revealed a cubic phase, with a lattice constant of 8.0374 Å and a crystallite size of 36 nm. The morphology was examined by scanning electron microscopy/energy-dispersive X-ray analysis (SEM/EDX). The gap of CFO, obtained from UV–VIS diffuse reflectance spectroscopy, was 1.46 eV. The flat band potential (E<sub>fb</sub> = 0.06 V<sub><i>SCE</i></sub>) was obtained from the capacitance-potential (C<sup>−2</sup>—E) characteristic in NaOH (0.1 M) solution with <i>p</i>-type behavior. The cyclic voltammetry of CFO indicated favorable hydrogen generation under visible light irradiation, with a potential of -0.7 V<sub>SCE</sub>. An H<sub>2</sub> liberation rate of 48 μmol min<sup>−1</sup>g<sup>−1</sup> was reached under optimal conditions: 1g/L of catalyst, basic medium NaOH at a temperature of 50&#xa0;°C in the presence of hole scavenger SO<sub>3</sub><sup>2−</sup> (10<sup>–3</sup> M).</p>

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Photocatalytic and photoelectrochemical performance of CoFe2O4 spinel for visible-light-driven hydrogen generation

  • 期刊论文

  • 发表日期：

    2025年5月4日

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  • Billal Brahimi,
  • Elhadj Mekatel,
  • Mahmut Özacar,
  • Mohamed Belmedani,
  • Maroua Benlembarek,
  • Mohamed Trari

摘要

Hydrogen is a clean and sustainable energy source, making the development of efficient production technologies essential for meeting global energy demands and mitigating carbon emissions. In this study, the optical and photo-electrochemical properties of CoFe2O4 (CFO) nanoparticles have been investigated, highlighting their effectiveness in hydrogen generation. CFO was synthesized using the wet method and formed at 700 °C, the spinel was identified by X-ray diffraction (XRD), FTIR spectroscopy, Raman, and X-ray photoelectron spectroscopy (XPS). The XRD pattern revealed a cubic phase, with a lattice constant of 8.0374 Å and a crystallite size of 36 nm. The morphology was examined by scanning electron microscopy/energy-dispersive X-ray analysis (SEM/EDX). The gap of CFO, obtained from UV–VIS diffuse reflectance spectroscopy, was 1.46 eV. The flat band potential (Efb = 0.06 VSCE) was obtained from the capacitance-potential (C−2—E) characteristic in NaOH (0.1 M) solution with p-type behavior. The cyclic voltammetry of CFO indicated favorable hydrogen generation under visible light irradiation, with a potential of -0.7 VSCE. An H2 liberation rate of 48 μmol min−1g−1 was reached under optimal conditions: 1g/L of catalyst, basic medium NaOH at a temperature of 50 °C in the presence of hole scavenger SO32− (10–3 M).