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<p>This study investigates the photo-catalytic and super-capacitive properties of green-synthesized ZnO/Ag<sub>2</sub>O nanocomposites using <i>P. macrosolen L</i>. leaf extract. The synthesis was performed in a single step at low temperature with a short reaction time. The synthesized materials were characterized using XRD, SEM, TEM, FTIR, UV-VIS and XPS. The ZnO/Ag<sub>2</sub>O nanocomposites exhibited exceptional photo-catalytic efficiency and stability under visible light for the degradation of carbon-based dyes. The degradation rate constants of the optimized ZnO/Ag<sub>2</sub>O nanocomposites were 0.054351&#xa0;min⁻¹ for Methylene Orange (MO) and 0.048751&#xa0;min⁻¹ for Toluidine Blue (TB), achieving degradation efficiencies of 99.69% and 98.50%, respectively, compared to ZnO (0.0075&#xa0;min⁻¹). This remarkable improvement in visible-light photo-catalytic performance is attributed to the hetero-junction formation, which enhances charge separation and transfer through the matched crystal lattices and energy bands of Ag<sub>2</sub>O and ZnO. The Ag<sub>2</sub>O nanoparticles efficiently generate and transfer excited electrons to the ZnO conduction band under visible-light irradiation. Electrochemical studies revealed a significant improvement in specific capacitance, with the ZnO/Ag<sub>2</sub>O composite containing 50 wt% AgNO<sub>3</sub> achieving a maximum specific capacitance of 655.0&#xa0;F/g at a scan rate of 10 mV/s. This superior performance highlights the synergistic effect of ZnO and Ag<sub>2</sub>O in improving photo-catalytic and electrochemical properties. These findings demonstrate the potential of ZnO/Ag<sub>2</sub>O nanocomposites for industrial dye degradation and super-capacitor applications.</p>

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Photo and electrochemical applications of green synthesized ZnO/Ag2O nanocomposites materials under visible light using P. macrosolen L. leaf

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月28日

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  • Abel Saka Gungure,
  • Leta Tesfaye Jule,
  • Krishnaraj Ramaswamy,
  • N. Nagaprasad,
  • Shanmugam Ramaswamy

摘要

This study investigates the photo-catalytic and super-capacitive properties of green-synthesized ZnO/Ag2O nanocomposites using P. macrosolen L. leaf extract. The synthesis was performed in a single step at low temperature with a short reaction time. The synthesized materials were characterized using XRD, SEM, TEM, FTIR, UV-VIS and XPS. The ZnO/Ag2O nanocomposites exhibited exceptional photo-catalytic efficiency and stability under visible light for the degradation of carbon-based dyes. The degradation rate constants of the optimized ZnO/Ag2O nanocomposites were 0.054351 min⁻¹ for Methylene Orange (MO) and 0.048751 min⁻¹ for Toluidine Blue (TB), achieving degradation efficiencies of 99.69% and 98.50%, respectively, compared to ZnO (0.0075 min⁻¹). This remarkable improvement in visible-light photo-catalytic performance is attributed to the hetero-junction formation, which enhances charge separation and transfer through the matched crystal lattices and energy bands of Ag2O and ZnO. The Ag2O nanoparticles efficiently generate and transfer excited electrons to the ZnO conduction band under visible-light irradiation. Electrochemical studies revealed a significant improvement in specific capacitance, with the ZnO/Ag2O composite containing 50 wt% AgNO3 achieving a maximum specific capacitance of 655.0 F/g at a scan rate of 10 mV/s. This superior performance highlights the synergistic effect of ZnO and Ag2O in improving photo-catalytic and electrochemical properties. These findings demonstrate the potential of ZnO/Ag2O nanocomposites for industrial dye degradation and super-capacitor applications.