Revealing the super capacitive performance of N-doped hierarchical porous activated carbon in aqueous, ionic liquid, and redox additive electrolytes

离子液体 电解质 化学工程 活性炭 超级电容器 氧化还原 水溶液 多孔性 材料科学 电容感应 碳纤维 兴奋剂 电化学 无机化学 化学 纳米技术 电极 有机化学 吸附 复合材料 复合数 电气工程 工程类 催化作用 物理化学 光电子学
作者
M. Karnan,K. Hari Prakash,Sushmee Badhulika
出处
期刊:Journal of energy storage [Elsevier BV]
卷期号:53: 105189-105189 被引量:3
标识
DOI:10.1016/j.est.2022.105189
摘要

Supercapacitors are generally high-power devices, yet their energy is low in contrast to batteries. In the present study, the N-doped porous carbon optimized from brinjal bio-mass waste ( solanum melongena ) using KOH+ Urea activation confirms its ability as a supercapacitor electrode in presence of an aqueous (1 M H 2 SO 4 ), ionic liquid (1-ethyl-3-methylimidazolium-tetrafluoroborate-EMIMBF 4 ) and an improved redox additive (0.01 M Hydroquinone-HQ) electrolytes. The hierarchical porous nature of the activated brinjal bio-mass waste carbon with desired compositions and structure is analyzed using FE-SEM and HR-TEM analysis. In a two electrodes symmetric configuration, brinjal waste-derived activated carbon (BC-700) delivers a high specific capacitance of 460 F/g at 1 A/g in 1 M H 2 SO 4 aqueous electrolyte. In ionic liquid, it delivers 133 F/g high specific capacitance with an energy of 41 Wh/kg. This outstanding electrochemical performance is due to the electrolyte-ion movement of heteroatoms into the carbon matrix resulting in high specific surface area (850 m 2 g −1 ) and effective microporosity. The energy density of the supercapacitor device is further enriched using the novel redox additive 0.01 M Hydroquinone in H 2 SO 4 electrolyte with a specific capacity of 888 C/g and a maximum energy density of 61 Wh/kg, which is very high compared to batteries. Outstanding cyclic stability of 77 % capacitance retention after 5000 cycles is achieved in HQ-added aqueous electrolyte. Hence, the bio-mass waste-derived activated carbon performs as an excellent low-cost material for various electrochemical applications. • High surface area activated carbon from Solanum Melongina (BC-700) is synthesized using single step chemical activation method. • A symmetric supercapacitor was fabricated using EMIMBF 4 and HQ redox additive electrolyte. • The supercapacitor with HQ/1M H 2 SO 4 electrolyte delivered a maximum energy and power density of 61Wh/ kg and 9000 W/kg, respectively.
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