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<p>In this work, a green and sustainable redox additive electrolyte (RAE) derived from Catharanthus roseus flower-based nanoparticles (NPs) was developed and investigated for high-performance supercapacitor applications. The NPs were synthesized via a simple and eco-friendly plant-mediated route and systematically characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDAX). The electrochemical performance of the fabricated electrodes and asymmetric supercapacitors (ASCs) was evaluated using conventional 3&#xa0;M KOH and redox-active electrolyte (3&#xa0;M KOH + 0.2&#xa0;M K<sub>4</sub>[Fe(CN)<sub>6</sub>]). Cyclic voltammetry and galvanostatic charge–discharge measurements demonstrated a substantial improvement in charge storage behavior in the RAE system due to the contribution of additional reversible faradaic reactions. The working electrode delivered a high specific capacitance of 426.7 F g<sup>−1</sup> in RAE, significantly higher than that obtained in KOH. Furthermore, the assembled ASCs exhibited enhanced device performance with an energy density of 3.75 W h kg<sup>−1</sup> and a power density of 875 W kg<sup>−1</sup>, along with excellent cycling stability over 5000 charging discharging cycles. These results demonstrate the potential of Catharanthus roseus-derived redox additives electrolyte as an effective and environmentally friendly strategy for next-generation supercapacitor energy storage systems.</p>

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Catharanthus roseus–derived redox additive electrolyte for enhanced supercapacitor performance

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • A. Maggie Dayana,
  • F. Regan Maria Sundar Raj,
  • G. Hariharan,
  • A. Arivarasan

摘要

In this work, a green and sustainable redox additive electrolyte (RAE) derived from Catharanthus roseus flower-based nanoparticles (NPs) was developed and investigated for high-performance supercapacitor applications. The NPs were synthesized via a simple and eco-friendly plant-mediated route and systematically characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDAX). The electrochemical performance of the fabricated electrodes and asymmetric supercapacitors (ASCs) was evaluated using conventional 3 M KOH and redox-active electrolyte (3 M KOH + 0.2 M K4[Fe(CN)6]). Cyclic voltammetry and galvanostatic charge–discharge measurements demonstrated a substantial improvement in charge storage behavior in the RAE system due to the contribution of additional reversible faradaic reactions. The working electrode delivered a high specific capacitance of 426.7 F g−1 in RAE, significantly higher than that obtained in KOH. Furthermore, the assembled ASCs exhibited enhanced device performance with an energy density of 3.75 W h kg−1 and a power density of 875 W kg−1, along with excellent cycling stability over 5000 charging discharging cycles. These results demonstrate the potential of Catharanthus roseus-derived redox additives electrolyte as an effective and environmentally friendly strategy for next-generation supercapacitor energy storage systems.