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<p>Nanomaterials synthesis for energy storage often involves toxic chemicals, high temperatures, and non-renewable resources harming the environment. To address this, eco-friendly green electrodes must be developed for sustainable energy solutions. In this context, we have synthesized nickel oxide nanoparticles (NiO-NPs) using a dual-phytochemical approach, leveraging the bioactive compounds derived from <i>Eclipta prostrata</i> and <i>Ocimum tenuiflorum</i> extracts. The synthesized NiO-NPs exhibited homogeneous spherical morphology and revealed a crystalline nature with the approximate particle size of 18.3&#xa0;nm. The combined plant extract-derived NiO-NPs exhibit a half-cell gravimetric capacitance of 525 F/g. The fabricated asymmetric supercapacitor device with the as-prepared NiO-NPs as cathode and commercial activated carbon as anode delivered a full-cell gravimetric capacitance of ~ 101.35 F/g, an energy density of 106 Wh/kg at 1 A/g and a power density of 10,440 W/kg at 10 A/g. This device operates effectively up to 1.45&#xa0;V in an alkaline medium. The device also delivered a maximum columbic efficiency of 92.59% over 12,000 cycles in ambient condition. Hence, the synergistic effects on the phytochemicals improved the electrochemical properties, making the NiO-NPs suitable as an electrochemical energy electrode. Thus, this work highlights the potential of dual-phytochemical synthesis in advancing the development of sustainable and efficient electrode materials for next-generation supercapacitors.</p>

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One-Pot Dual-Phytochemical Synthesis of Nickel Oxide Nanoparticles from Eclipta prostrata and Ocimum tenuiflorum as a Green Electrode for High-Performance Pseudo-Capacitor

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • M. Revathi,
  • G. Nithya,
  • Sivagaami Sundari Gunasekaran,
  • E. Dhanalakshmi,
  • P. Rajesh,
  • Chang Woo Lee

摘要

Nanomaterials synthesis for energy storage often involves toxic chemicals, high temperatures, and non-renewable resources harming the environment. To address this, eco-friendly green electrodes must be developed for sustainable energy solutions. In this context, we have synthesized nickel oxide nanoparticles (NiO-NPs) using a dual-phytochemical approach, leveraging the bioactive compounds derived from Eclipta prostrata and Ocimum tenuiflorum extracts. The synthesized NiO-NPs exhibited homogeneous spherical morphology and revealed a crystalline nature with the approximate particle size of 18.3 nm. The combined plant extract-derived NiO-NPs exhibit a half-cell gravimetric capacitance of 525 F/g. The fabricated asymmetric supercapacitor device with the as-prepared NiO-NPs as cathode and commercial activated carbon as anode delivered a full-cell gravimetric capacitance of ~ 101.35 F/g, an energy density of 106 Wh/kg at 1 A/g and a power density of 10,440 W/kg at 10 A/g. This device operates effectively up to 1.45 V in an alkaline medium. The device also delivered a maximum columbic efficiency of 92.59% over 12,000 cycles in ambient condition. Hence, the synergistic effects on the phytochemicals improved the electrochemical properties, making the NiO-NPs suitable as an electrochemical energy electrode. Thus, this work highlights the potential of dual-phytochemical synthesis in advancing the development of sustainable and efficient electrode materials for next-generation supercapacitors.