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<p>The current study used neem leaves as a reducing agent and a simple laboratory reflux method to synthesize rGO/NiO nanocomposite. The rGO/NiO was spectroscopically validated using tools such as XRD, TEM, EDS, FTIR, UV and XPS. The rGO/NiO compound showed to be an outstanding photocatalyst, degrading Rose Bengal (RB) dye by 97% in 120&#xa0;min under UV light irradiation. The antioxidant properties were assessed using the diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging technique. The compound rGO/NiO showed increased antioxidant activity (91%) at 199.76 μL/μg. Enhanced proton diffusion coefficient (9.16 × 10<sup>–13</sup> m<sup>2</sup>/s) and electron-transfer resistance of the rGO/NiO electrode resulted in increased anodic and cathodic peak current, indicating the material’s electrochemical sensitivity. The energy storage and sensing capabilities of rGO/NiO was tested using an established electrode, which revealed a specific capacitance of 177.17 F g⁻<sup>1</sup> with 97% capacitance retention after 20 charge–discharge cycles, demonstrating encouraging initial electrochemical cycling performance. The electrochemical sensing investigation of rGO/NiO revealed that the limits of detection (LOD) and quantification (LOQ) for Cr<sup>+3</sup> was 27.36 and 82.91&#xa0;μM and for Hg<sup>+2</sup> were 8.85 and 26.81&#xa0;μM, respectively. As a result, the findings suggested that the nanocomposite is a promising candidate for environmental remediation and energy-related applications.</p>

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Green synthesis of rGO-doped NiO nanoparticles for photocatalysis, energy storage and sensor applications

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • P. Leelavathi,
  • V. Venkatalakshmi,
  • M. Mylarappa,
  • S. Chandruvasan,
  • Sowbhagya

摘要

The current study used neem leaves as a reducing agent and a simple laboratory reflux method to synthesize rGO/NiO nanocomposite. The rGO/NiO was spectroscopically validated using tools such as XRD, TEM, EDS, FTIR, UV and XPS. The rGO/NiO compound showed to be an outstanding photocatalyst, degrading Rose Bengal (RB) dye by 97% in 120 min under UV light irradiation. The antioxidant properties were assessed using the diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging technique. The compound rGO/NiO showed increased antioxidant activity (91%) at 199.76 μL/μg. Enhanced proton diffusion coefficient (9.16 × 10–13 m2/s) and electron-transfer resistance of the rGO/NiO electrode resulted in increased anodic and cathodic peak current, indicating the material’s electrochemical sensitivity. The energy storage and sensing capabilities of rGO/NiO was tested using an established electrode, which revealed a specific capacitance of 177.17 F g⁻1 with 97% capacitance retention after 20 charge–discharge cycles, demonstrating encouraging initial electrochemical cycling performance. The electrochemical sensing investigation of rGO/NiO revealed that the limits of detection (LOD) and quantification (LOQ) for Cr+3 was 27.36 and 82.91 μM and for Hg+2 were 8.85 and 26.81 μM, respectively. As a result, the findings suggested that the nanocomposite is a promising candidate for environmental remediation and energy-related applications.