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<p>A bifunctional SiO₂<b>–</b>NiMn₂O₄ nanocomposite with a three-dimensional octahedral architecture was synthesized via a facile co-precipitation method for simultaneous photocatalytic and supercapacitor applications. Comprehensive characterization using XRD, FTIR, FESEM, HR-TEM, and XPS confirmed the formation of a well-defined crystalline structure with favorable surface chemistry. Electrochemical measurements revealed pronounced pseudocapacitive behavior attributed to reversible Faradaic redox processes, delivering high specific capacitances of 1218 Fg⁻<sup>1</sup> for NiMn₂O₄ and 1520 Fg⁻<sup>1</sup> for SiO₂–NiMn₂O₄ at 1 A g⁻<sup>1</sup>. Notably, SiO₂<b>–</b>NiMn₂O₄ retained 88% of its capacitance after 5000 cycles at 7 A g⁻<sup>1</sup> with a coulombic efficiency of 93.3%. As a photocatalyst, the nanocomposite achieved rapid degradation of methylene blue (97.94% in 30&#xa0;min) under UV irradiation, with excellent photostability. These results demonstrate the synergistic enhancement enabled by the SiO₂ matrix and octahedral morphology, positioning SiO₂<b>–</b>NiMn₂O₄ as a promising candidate for integrated energy storage and environmental remediation technologies.</p>

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A novel synergistic SiO2–NiMn2O4 nanocomposite for enhanced supercapacitor and photocatalytic performance

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Infant Francita Fonseka Christopher,
  • Amudhavalli Karuppiah,
  • Gautham Devendrapandi,
  • Ranjith Balu

摘要

A bifunctional SiO₂–NiMn₂O₄ nanocomposite with a three-dimensional octahedral architecture was synthesized via a facile co-precipitation method for simultaneous photocatalytic and supercapacitor applications. Comprehensive characterization using XRD, FTIR, FESEM, HR-TEM, and XPS confirmed the formation of a well-defined crystalline structure with favorable surface chemistry. Electrochemical measurements revealed pronounced pseudocapacitive behavior attributed to reversible Faradaic redox processes, delivering high specific capacitances of 1218 Fg⁻1 for NiMn₂O₄ and 1520 Fg⁻1 for SiO₂–NiMn₂O₄ at 1 A g⁻1. Notably, SiO₂–NiMn₂O₄ retained 88% of its capacitance after 5000 cycles at 7 A g⁻1 with a coulombic efficiency of 93.3%. As a photocatalyst, the nanocomposite achieved rapid degradation of methylene blue (97.94% in 30 min) under UV irradiation, with excellent photostability. These results demonstrate the synergistic enhancement enabled by the SiO₂ matrix and octahedral morphology, positioning SiO₂–NiMn₂O₄ as a promising candidate for integrated energy storage and environmental remediation technologies.