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<p>Biomass which can be repurposed into useful products, adding value to what would otherwise be waste. Level of agricultural solid waste globally increasing day by day and causes damages to the disposal measurements. To overcome this problem, it is exploited towards the carbon production. In this study, available coconut bracts were recycled by making it into activated carbon and made an important effect on energy storage systems. Initially, the biomass materials were carbonized at and chemically activated with KOH. The carbonized coconut bracts (CB) and activated coconut bracts (ACB) were characterized by x-ray diffraction (XRD), Raman, scanning electron spectroscopy (SEM), energy dispersive x-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) and compared their physico-chemical properties. Further, electrochemical performance was studied by using electro-analytical techniques such as cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy in 1M H<sub>2</sub>SO<sub>4</sub> solution. ACB from coconut bracts were estimated in three-electrode system for supercapacitor studies and found to show the specific capacitance (C<sub>sp</sub>) of 561&#xa0;F/g at a scan rate of 2 mV/s and 388&#xa0;F/g at a current density of 2&#xa0;A/g. The prepared ACB material was subjected to cyclic studies for 10,000 cycles and found to be 89% columbic efficiency with 97.7% retention efficiency. The symmetric supercapacitor device (SSD) using ACB exhibited 241&#xa0;F/g at 2 mV/s and 105&#xa0;F/g at 1&#xa0;A/g which serves as a good electrode for supercapacitor applications.</p>

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Coconut bract derived activated carbon: a good performance material for supercapacitors

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Nandhini Dhanavel,
  • Gireeshkumar Basavaraj Chavati,
  • Sharath Kumar Basavaraju,
  • Malashri Boraiah Sannaobaiah,
  • Ramarao Viswanatha,
  • Krishna Venkatesh,
  • Handanahalli Basavarajaiah Muralidhara

摘要

Biomass which can be repurposed into useful products, adding value to what would otherwise be waste. Level of agricultural solid waste globally increasing day by day and causes damages to the disposal measurements. To overcome this problem, it is exploited towards the carbon production. In this study, available coconut bracts were recycled by making it into activated carbon and made an important effect on energy storage systems. Initially, the biomass materials were carbonized at and chemically activated with KOH. The carbonized coconut bracts (CB) and activated coconut bracts (ACB) were characterized by x-ray diffraction (XRD), Raman, scanning electron spectroscopy (SEM), energy dispersive x-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) and compared their physico-chemical properties. Further, electrochemical performance was studied by using electro-analytical techniques such as cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy in 1M H2SO4 solution. ACB from coconut bracts were estimated in three-electrode system for supercapacitor studies and found to show the specific capacitance (Csp) of 561 F/g at a scan rate of 2 mV/s and 388 F/g at a current density of 2 A/g. The prepared ACB material was subjected to cyclic studies for 10,000 cycles and found to be 89% columbic efficiency with 97.7% retention efficiency. The symmetric supercapacitor device (SSD) using ACB exhibited 241 F/g at 2 mV/s and 105 F/g at 1 A/g which serves as a good electrode for supercapacitor applications.