超级电容器
材料科学
碳纤维
化学工程
多孔性
电容
电极
兴奋剂
氧气
纳米技术
化学
光电子学
复合材料
复合数
工程类
有机化学
物理化学
作者
Erman Taer,Apriwandi Apriwandi,Nursyafni Nursyafni,Rika Taslim
标识
DOI:10.1016/j.est.2022.104911
摘要
This successfully performed a facile one-way KOH impregnation strategy, to hierarchically prepare interconnected 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 H 2 SO 4 , NaOH, and Na 2 SO 4 , respectively. This indicated that the symmetric supercapacitor-based PCBL-5 had a high specific capacitance of 293 F g −1 in 1 M H 2 SO 4 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 H 2 SO 4 , NaOH, and Na 2 SO 4 , at an optimum power density of 178.44 W kg −1 . The observed desirable excellent material and electrochemical behaviors 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. • A facile one-way KOH impregnation strategy obtains high-quality carbon electrode. • Averrhoa bilimbi leaves-derived carbon contains enrich self-oxygen doping. • PCBLs has possesses 3D hierarchical porous carbon with abundant micropores. • The symmetric supercapacitor has high specific capacitance 293 F g −1 at 1 A g −1 . • The energy density is 26.5 Wh kg −1 at coulombic efficiency of 70.5%.
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