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<p>This study reports the development and electrochemical evaluation of sustainable composite electrodes based on biomass-derived activated carbon (AC) and manganese dioxide (MnO₂) nanoparticles for high-performance supercapacitor applications. Activated carbon was synthesized from coconut coir through chemical activation followed by pyrolysis, resulting in a high specific surface area of approximately ~ 1254 m<sup>2</sup> g<sup>− 1</sup> and a well-developed hierarchical porous structure with an average pore size of ~ 2.13&#xa0;nm. MnO<sub>2</sub> nanoparticles were prepared via a hydrothermal route and subsequently incorporated into the AC matrix in different weight ratios to form composite electrodes. Electrochemical measurements revealed that the composite containing 30 wt% AC and 70 wt% MnO<sub>2</sub> (ACC30C) delivered superior performance, achieving a high specific capacitance of ~ 182&#xa0;F g<sup>− 1</sup> at a current density of 1&#xa0;A g<sup>− 1</sup>, along with good rate capability and excellent cycling stability, retaining ~ 91.66% of its initial capacitance after 1000 charge–discharge cycles. Physicochemical characterizations confirmed uniform MnO<sub>2</sub> dispersion and strong interfacial interaction between the two components. The enhanced electrochemical behavior is attributed to the synergistic combination of electric double-layer capacitance from AC and pseudocapacitance from MnO<sub>2</sub>, facilitated by an interconnected mesoporous network that promotes efficient ion transport. These results demonstrate that the ACC30C composite is a promising eco-friendly electrode material for next-generation supercapacitor technologies.</p>

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Development of coconut coir-derived activated carbon and β−MnO2 composites for hybrid supercapacitor

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Sankul Mahajan,
  • Yogendra Mahton,
  • Tandra Rani Mohanta,
  • Partha Saha

摘要

This study reports the development and electrochemical evaluation of sustainable composite electrodes based on biomass-derived activated carbon (AC) and manganese dioxide (MnO₂) nanoparticles for high-performance supercapacitor applications. Activated carbon was synthesized from coconut coir through chemical activation followed by pyrolysis, resulting in a high specific surface area of approximately ~ 1254 m2 g− 1 and a well-developed hierarchical porous structure with an average pore size of ~ 2.13 nm. MnO2 nanoparticles were prepared via a hydrothermal route and subsequently incorporated into the AC matrix in different weight ratios to form composite electrodes. Electrochemical measurements revealed that the composite containing 30 wt% AC and 70 wt% MnO2 (ACC30C) delivered superior performance, achieving a high specific capacitance of ~ 182 F g− 1 at a current density of 1 A g− 1, along with good rate capability and excellent cycling stability, retaining ~ 91.66% of its initial capacitance after 1000 charge–discharge cycles. Physicochemical characterizations confirmed uniform MnO2 dispersion and strong interfacial interaction between the two components. The enhanced electrochemical behavior is attributed to the synergistic combination of electric double-layer capacitance from AC and pseudocapacitance from MnO2, facilitated by an interconnected mesoporous network that promotes efficient ion transport. These results demonstrate that the ACC30C composite is a promising eco-friendly electrode material for next-generation supercapacitor technologies.