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Ram Lal Shrestha, Rashma Chaudhary, Rekha Goswami Shrestha, Timila Shrestha, Subrata Maji, Katsuhiko Ariga, Lok Kumar Shrestha, Washnut Seed-Derived Ultrahigh Surface Area Nanoporous Carbons as High Rate Performance Electrode Material for Supercapacitors, Bulletin of the Chemical Society of Japan, Volume 94, Issue 2, February 2021, Pages 565–572, https://doi.org/10.1246/bcsj.20200314
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Abstract
Hierarchical porous carbon materials with high surface area and large porosity derived from biomass are desired for the sustainable development of low-cost electrode materials for advanced energy storage devices. Here, we report the electrochemical supercapacitance performance of washnut seed-derived nanoporous carbon materials in aqueous electrolyte (1 M H2SO4) on a three-electrode system. Potassium hydroxide (KOH) activation of the pre-carbonized Washnut seed powder at high temperatures (800–1000 °C) under nitrogen atmosphere yielded nanoporous carbons with hierarchical micro- and mesoporous structure with well-developed porosity. The surface areas and pore volumes are found in the range of 2005 to 2185 m2 g−1 and 1.370 to 2.002 cm3 g−1, respectively. The as-prepared materials showed outstanding electrochemical energy storage performance achieving a high specific capacitance of 288.7 F g−1 at a current density of 1 A g−1 followed by a high rate capability sustaining 67.2% capacitance even at a high current density of 50 A g−1 with only a small capacity loss (<2%) after 10,000 charging/discharging cycles. This work demonstrates novel insights into low-cost high-performance carbon materials design using natural biomass for the sustainable development of electrode materials for advanced supercapacitor applications.
