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<p>Biomass-derived microporous carbon-based supercapacitors have recently gained considerable attention, primarily due to their exceptional cost-efficiency and significant contribution to promoting social sustainability. In this study, the long-fiber plant okra stem was selected as a precursor for carbon materials. Utilizing its natural channels, microporous carbon electrode materials were successfully synthesized through direct pyrolysis combined with KOH activation. The optimized carbon electrode was then used to fabricate a symmetric supercapacitor. At a relatively low activation temperature of 500&#xa0;°C, the symmetric supercapacitor exhibited excellent electrochemical performance. The specific capacitance reached 100.3&#xa0;F g<sup>− 1</sup> when tested at a current density of 0.2&#xa0;A g<sup>− 1</sup>. Furthermore, after 10,000 charge-discharge cycles at a current density of 2&#xa0;A g<sup>− 1</sup>, the supercapacitor retained 97% of its original capacitance, demonstrating outstanding cycling stability. This configuration not only enhanced the overall performance and durability but also significantly improved safety, making it well-suited for applications in electronic devices.</p>

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Pore-engineered okra stem derived activated carbon with large surface area for high-performance supercapacitors

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Wen Li,
  • Mingyu Wu,
  • Zejian Chen,
  • Jianxiong Zhao,
  • Rongke Sun,
  • Xiao Zhang,
  • Dongliang Ma,
  • Yanqing Ma,
  • Lei Ma

摘要

Biomass-derived microporous carbon-based supercapacitors have recently gained considerable attention, primarily due to their exceptional cost-efficiency and significant contribution to promoting social sustainability. In this study, the long-fiber plant okra stem was selected as a precursor for carbon materials. Utilizing its natural channels, microporous carbon electrode materials were successfully synthesized through direct pyrolysis combined with KOH activation. The optimized carbon electrode was then used to fabricate a symmetric supercapacitor. At a relatively low activation temperature of 500 °C, the symmetric supercapacitor exhibited excellent electrochemical performance. The specific capacitance reached 100.3 F g− 1 when tested at a current density of 0.2 A g− 1. Furthermore, after 10,000 charge-discharge cycles at a current density of 2 A g− 1, the supercapacitor retained 97% of its original capacitance, demonstrating outstanding cycling stability. This configuration not only enhanced the overall performance and durability but also significantly improved safety, making it well-suited for applications in electronic devices.