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<p>Supercapacitors (SCs) are one of the sophisticated energy storage devices because of their high capacitance, power density, and extended cycle life. In contrast to conventional batteries, Supercapacitors store energy electrostatically, allowing millions of operation cycles. Activated carbons (AC) made from biomass can be designed to have a hierarchical pore structure and a high specific surface area. These parameters create enormous sites for ion adsorption for SCs to store energy. In the present work, the Activated carbon was made from the Cashew Nut Shell (CNS) through chemical activation (KOH) process, and the composites (MWCNTs) with various concentrations (0wt%, 1wt%, 3wt%, 5wt%, 10wt%) were merged with the AC for making supercapacitor electrodes. From the above, the sample CM–2 (3wt% of MWCNTs + AC) exhibits a high specific surface area (1160.4 m<sup>2</sup>/g), which shows a high specific capacity of 82.5&#xa0;F/g at a current of 1&#xa0;mA in a two–electrode system. Moreover, it displays a maximum specific energy density of 27.8Wh kg<sup>–1</sup> at a specific power density of 808.4&#xa0;W kg<sup>–1</sup>. Furthermore, the fabricated coin cell for the sample CM–2 exhibited a capacitance retention of 95.58% even after the 10,000 charge–discharge cycles. Thus, the optimal wt% of MWCNTs with the AC is considered as a suitable and effective electrode for the Supercapacitor applications.</p>

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Cashew Nut Shell–derived activated carbon/MWCNTs composite electrodes for enhanced Supercapacitor performance

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Nivetha Rajendran,
  • Velmathi Guruviah

摘要

Supercapacitors (SCs) are one of the sophisticated energy storage devices because of their high capacitance, power density, and extended cycle life. In contrast to conventional batteries, Supercapacitors store energy electrostatically, allowing millions of operation cycles. Activated carbons (AC) made from biomass can be designed to have a hierarchical pore structure and a high specific surface area. These parameters create enormous sites for ion adsorption for SCs to store energy. In the present work, the Activated carbon was made from the Cashew Nut Shell (CNS) through chemical activation (KOH) process, and the composites (MWCNTs) with various concentrations (0wt%, 1wt%, 3wt%, 5wt%, 10wt%) were merged with the AC for making supercapacitor electrodes. From the above, the sample CM–2 (3wt% of MWCNTs + AC) exhibits a high specific surface area (1160.4 m2/g), which shows a high specific capacity of 82.5 F/g at a current of 1 mA in a two–electrode system. Moreover, it displays a maximum specific energy density of 27.8Wh kg–1 at a specific power density of 808.4 W kg–1. Furthermore, the fabricated coin cell for the sample CM–2 exhibited a capacitance retention of 95.58% even after the 10,000 charge–discharge cycles. Thus, the optimal wt% of MWCNTs with the AC is considered as a suitable and effective electrode for the Supercapacitor applications.