Biomass Nanoarchitectonics: Nitrogen-doped Hierarchical Porous Carbons as Electrode Materials for High-Performance Supercapacitors

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ID: 320436
2026
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Abstract
Abstract This paper reports on the fabrication of self-nitrogen-doped nanoporous carbon materials via Zinc chloride (ZnCl2) activation of Macrotyloma uniflorum seeds at different carbonization temperatures (600-900 °C) and impregnation ratios (0.5 to 3), and on their supercapacitance performance in an aqueous electrolyte (1 M H2SO4). The sample carbonized at 800 °C with a 3:1 impregnation ratio (HGC_Z3_800) demonstrated an optimum surface area of 1518 m2 g-1 and a large pore volume of 1.14 cm3 g-1 due to the presence of hierarchical micro- and mesoporous structures along with a 4.4 at% nitrogen doping, suggesting that ZnCl2 facilitated the formation of nanoporous structures and effectively prevented nitrogen loss during carbonization. The optimal sample exhibited outstanding supercapacitance performance, achieving a high specific capacitance of 441 F g-1 at a current density of 1 A g-1 in a three-electrode system. The assembled symmetric cell delivered an energy density of 8.4 Wh kg-1 at a power density of 600 W kg-1 and retained 87.2% capacitance after 10,000 charging/discharging cycles. These results highlight the potential of self-nitrogen-doped nanoporous carbons with a tailored pore structure as a sustainable, high-performance electrode material for next-generation energy storage devices.
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Authors Sabina Shahi, Sarita Manandhar, Rekha Goswami Shrestha, Chhabi Lal Gnawali, Mandira Pradhananga Adhikari, Katsuhiko Ariga, Lok Kumar Shrestha
Journal bulletin of the chemical society of japan
Year 2026
DOI
10.1093/bulcsj/uoag096
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