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

Karnan, M. and Hari Prakash, K. and Badhulika, Sushmee (2022) Revealing the super capacitive performance of N-doped hierarchical porous activated carbon in aqueous, ionic liquid, and redox additive electrolytes. Journal of Energy Storage, 53. pp. 1-11. ISSN 2352-152X

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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 H2SO4), ionic liquid (1-ethyl-3-methylimidazolium-tetrafluoroborate-EMIMBF4) 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 H2SO4 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 m2 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 H2SO4 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. © 2022 Elsevier Ltd

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IITH Creators:
IITH CreatorsORCiD
Badhulika, Sushmee
Item Type: Article
Additional Information: The authors acknowledge financial assistance from Defence Research Development Organization Young Scientist Laboratory-Smart Materials (DRDO DYSL-SM) grant DYSL-SM/CARS-04 .
Uncontrolled Keywords: Activation; Brinjal bio-mass; Ionic liquid; Redox additive; Supercapacitor
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 18 Jul 2022 09:06
Last Modified: 18 Jul 2022 09:06
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