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<p>The primary objective of this study is synthesis of copper zinc aluminate (CuZnAl₂O₄) composite nanoparticles (CZA NPs) utilising <i>Azadirachta indica</i> (neem) leaf extract as a green reducing and stabilizing agent. The formation of a CuZnAl₂O₄ composite was confirmed by powder X-ray diffraction (PXRD), where the diffraction peaks matched the standard ZnAl₂O₄ spinel structure (JCPDS card No. 82-1043) without any observable peak shift, indicating that copper exists as a separate CuO phase rather than being incorporated into the spinel lattice. The average crystallite size of the CZA NPs was determined to be 28&#xa0;nm, and the PXRD data confirm a cubic spinel nanostructure with Fd3̄m space group. UV-DRS investigations revealed a band energy gap (Eg) of 4.68&#xa0;eV for the CZA NPs. The photocatalytic performance of CZA NPs was significantly enhanced, achieving 70.35% degradation of Fast Blue (FB) dye in wastewater under UV irradiation. Electrochemical evaluation using cyclic voltammetry (CV) with a graphite electrode paste in 1&#xa0;M KOH electrolyte demonstrated excellent redox potential output. Electrochemical impedance spectroscopy (EIS) confirmed that the improved electrochemical behaviour of CZA NPs is attributed to their decreased charge transfer resistance. The specific capacitance of CZA NPs was calculated to be 253&#xa0;F g⁻¹ at a current density of 5&#xa0;A g⁻¹. These findings demonstrate that CZA NPs are a promising candidate for application in both wastewater treatment and supercapacitor devices.</p> Graphical abstract <p></p>

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Synthesis and characterization of copper zinc aluminate nanomaterials using neem plant extract: its photocatalytic and supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Maneesha Chindukuri,
  • Dilip Kumar Behara,
  • C. Prasanth Sai

摘要

The primary objective of this study is synthesis of copper zinc aluminate (CuZnAl₂O₄) composite nanoparticles (CZA NPs) utilising Azadirachta indica (neem) leaf extract as a green reducing and stabilizing agent. The formation of a CuZnAl₂O₄ composite was confirmed by powder X-ray diffraction (PXRD), where the diffraction peaks matched the standard ZnAl₂O₄ spinel structure (JCPDS card No. 82-1043) without any observable peak shift, indicating that copper exists as a separate CuO phase rather than being incorporated into the spinel lattice. The average crystallite size of the CZA NPs was determined to be 28 nm, and the PXRD data confirm a cubic spinel nanostructure with Fd3̄m space group. UV-DRS investigations revealed a band energy gap (Eg) of 4.68 eV for the CZA NPs. The photocatalytic performance of CZA NPs was significantly enhanced, achieving 70.35% degradation of Fast Blue (FB) dye in wastewater under UV irradiation. Electrochemical evaluation using cyclic voltammetry (CV) with a graphite electrode paste in 1 M KOH electrolyte demonstrated excellent redox potential output. Electrochemical impedance spectroscopy (EIS) confirmed that the improved electrochemical behaviour of CZA NPs is attributed to their decreased charge transfer resistance. The specific capacitance of CZA NPs was calculated to be 253 F g⁻¹ at a current density of 5 A g⁻¹. These findings demonstrate that CZA NPs are a promising candidate for application in both wastewater treatment and supercapacitor devices.

Graphical abstract