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<p>In this work, a hierarchical CeO₂/NiO/SiNWs nanocomposite was successfully synthesized and evaluated as a high-performance photocatalyst for the visible-light-induced degradation of methylene blue (MB). The silicon nanowires (SiNWs) were fabricated via silver-assisted chemical etching and served as a conductive scaffold for the hydrothermal deposition of CeO₂ and NiO nanoparticles, forming a well-integrated p–n heterojunction. Comprehensive structural and morphological characterizations confirmed the successful incorporation of both metal oxides onto the SiNW arrays. Optical analyses revealed strong visible light absorption, high refractive index, and enhanced extinction behavior, while dielectric studies showed high real permittivity, long relaxation time, and low dissipation loss key parameters for efficient charge separation and reduced recombination. Photocatalytic tests demonstrated that the CeO₂/NiO/SiNWs composite achieved 98% degradation of MB within 90&#xa0;min under visible light, outperforming both bare SiNWs and photolysis. Kinetic studies confirmed a significant increase in the apparent rate constant, highlighting the synergistic effects of the heterojunction and nanostructured architecture. This study not only establishes the CeO₂/NiO/SiNWs system as a highly efficient photocatalyst but also underscores the critical role of optical and dielectric properties in governing photocatalytic performance under visible light.</p>

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Enhanced visible-light photocatalysis via CeO2/NiO heterostructures integrated on silicon nanowires: correlating optical and dielectric properties with methylene blue degradation efficiency

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Afaf Brik,
  • Khaled Derkaoui,
  • Toufik Hadjersi,
  • Sabrina naama,
  • Karima benfadel,
  • Souraya Bouachma,
  • Soumia Benredouane,
  • Khadidja Boukhouidem

摘要

In this work, a hierarchical CeO₂/NiO/SiNWs nanocomposite was successfully synthesized and evaluated as a high-performance photocatalyst for the visible-light-induced degradation of methylene blue (MB). The silicon nanowires (SiNWs) were fabricated via silver-assisted chemical etching and served as a conductive scaffold for the hydrothermal deposition of CeO₂ and NiO nanoparticles, forming a well-integrated p–n heterojunction. Comprehensive structural and morphological characterizations confirmed the successful incorporation of both metal oxides onto the SiNW arrays. Optical analyses revealed strong visible light absorption, high refractive index, and enhanced extinction behavior, while dielectric studies showed high real permittivity, long relaxation time, and low dissipation loss key parameters for efficient charge separation and reduced recombination. Photocatalytic tests demonstrated that the CeO₂/NiO/SiNWs composite achieved 98% degradation of MB within 90 min under visible light, outperforming both bare SiNWs and photolysis. Kinetic studies confirmed a significant increase in the apparent rate constant, highlighting the synergistic effects of the heterojunction and nanostructured architecture. This study not only establishes the CeO₂/NiO/SiNWs system as a highly efficient photocatalyst but also underscores the critical role of optical and dielectric properties in governing photocatalytic performance under visible light.