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<p>Pure and Ce-doped (5, 10 and 15 wt%) LaCoO<sub>3</sub> were prepared by the hydrothermal reaction method to enhance the photocatalytic degradation of methylene blue (MB) dye and photocatalytic water splitting. The presence of pure perovskite-type rhombohedral phase in the synthesized Ce-doped LaCoO<sub>3</sub> nanoparticles was found using XRD analysis. The morphology of Ce-doped LaCoO<sub>3</sub> perovskite nanoparticles was represented by spherical clusters. The EDAX spectrum revealed the incorporation of Ce in LaCoO<sub>3</sub> matrix. As the concentration of Ce was increased, the band gap energy of Ce-doped LaCoO<sub>3</sub> increased slightly. Photoluminescence investigation confirmed that Ce-doping contributed to enhanced migration of photogenerated charge carriers. Chemical states of La, Co and Ce ions in pure LaCoO<sub>3</sub> and 10 wt% Ce-doped LaCoO<sub>3</sub> perovskite nanoparticles were revealed by XPS analysis. The 10 wt% Ce-doped LaCoO<sub>3</sub> perovskite nanoparticles exhibited 2.6 times and 1.7 times higher reaction rate and dye degradation efficiency, respectively, in comparison to pure LaCoO<sub>3</sub>. At optimal photocatalyst composition, the photocatalytic activity with reaction rate k = 0.00847/min, and efficiency η = 75.1% for dye degradation and highest value of hydrogen production with 1984.48 µmol/g for 5&#xa0;h were determined. Recycle studies ensures the photocatalyst robustness against photo-corrosion. The scavengers and electron spin resonance (ESR) studies revealed that hydroxyl and superoxide radicals enhanced the photocatalytic activity.</p>

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Optimization of Ce doping for enhancement of photocatalytic activity of LaCoO3 perovskite nanoparticles

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Swarna Lakshmi Rajendran,
  • Mano Ganapathy,
  • Viswanathan Alagan

摘要

Pure and Ce-doped (5, 10 and 15 wt%) LaCoO3 were prepared by the hydrothermal reaction method to enhance the photocatalytic degradation of methylene blue (MB) dye and photocatalytic water splitting. The presence of pure perovskite-type rhombohedral phase in the synthesized Ce-doped LaCoO3 nanoparticles was found using XRD analysis. The morphology of Ce-doped LaCoO3 perovskite nanoparticles was represented by spherical clusters. The EDAX spectrum revealed the incorporation of Ce in LaCoO3 matrix. As the concentration of Ce was increased, the band gap energy of Ce-doped LaCoO3 increased slightly. Photoluminescence investigation confirmed that Ce-doping contributed to enhanced migration of photogenerated charge carriers. Chemical states of La, Co and Ce ions in pure LaCoO3 and 10 wt% Ce-doped LaCoO3 perovskite nanoparticles were revealed by XPS analysis. The 10 wt% Ce-doped LaCoO3 perovskite nanoparticles exhibited 2.6 times and 1.7 times higher reaction rate and dye degradation efficiency, respectively, in comparison to pure LaCoO3. At optimal photocatalyst composition, the photocatalytic activity with reaction rate k = 0.00847/min, and efficiency η = 75.1% for dye degradation and highest value of hydrogen production with 1984.48 µmol/g for 5 h were determined. Recycle studies ensures the photocatalyst robustness against photo-corrosion. The scavengers and electron spin resonance (ESR) studies revealed that hydroxyl and superoxide radicals enhanced the photocatalytic activity.