Erman Taer, - and Apriwandi, - and Nursyafni, - and Rika Taslim, - (2022) Averrhoa bilimbi leaves-derived oxygen doped 3D-linked hierarchical porous carbon as high-quality electrode material for symmetric supercapacitor. Journal of Energy Storage, 52. ISSN 2352-152X

Text 14. Belimbing_Journal of Energy Storage 52 (2022) 104911.pdf Download (3MB)

Abstract

This successfully performed a facile one-way KOH impregnation strategy, to hierarchically prepare inter- connected porous carbon and self-oxygen doped from Averrhoa bilimbi leaves waste, as binder-free electrode material (PCBLs) for high-quality symmetrical supercapacitor. 3D porous structure and surface area PCBLs- derived controlled by different KOH concentrated solution. KOH infiltrated into precursor as act activation agent to completely removed inorganic impurities, result high carbon content of 85.54–87.22% with oxygen functional group of 10.61–14.71%. The precursor impregnated at 0.5 mol/L possessed excellent micropores 87.69%, adjusting mesopores and appropriate amounts of oxygen doped of 14.71%. As a result, it performed high performance of symmetrical supercapacitor. Furthermore, the electrochemical performance was evaluated within a two-electrode system using a binder-free solid coin design in different aqueous electrolytes of 1 M H2SO4, NaOH, and Na2SO4, respectively. This indicated that the symmetric supercapacitor-based PCBL-5 had a high specific capacitance of 293 F g− 1 in 1 M H2SO4 aqueous electrolyte at a current density of 1.0 A g− 1 . It also showed impressive energy densities of 26.54, 21.85, and 16.12 Wh kg− 1 in 1 M H2SO4, NaOH, and Na2SO4, at an optimum power density of 178.44 W kg− 1 . The observed desirable excellent material and electrochemical be- haviors of the new source hierarchical porous carbon derived from Averrhoa bilimbi leaves waste would be a competitive candidate as electrode material in the development of high-quality supercapacitor devices.

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