Electrochemical Performance of Thespesia Populnea Seeds Derived Activated Carbon - Supercapacitor and Its Improved Specific Energy in Redox Additive Electrolytes. (December 2020)

• Record Type: Journal Article
• Authors: Manickavasakam, Karnan; Suresh Balaji, S.; Kaipannan, Subramani; Karthick Raj, A.G.; Veeman, Sannasi; Marappan, Sathish
• Is Part Of: Journal of energy storage. Volume 32(2020)
• Publication Date: 2020-12
• Subjects: energy storage -- supercapacitors -- activated carbon -- redox additive -- high specific energy; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2020.101939
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: For the first time, we prepared a high surface area activated carbon from Thespesia Populnea Seeds (TPC) with deferent activation temperature. A high energy symmetric supercapacitor was fabricated using TPC-700 in three different redox additives in electrolyte. The hydroquinone (HQ) based redox additive in 1M Na2 SO4 delivered a very high specific capacitance of 1096 C/g at 1 A/g current density. The fabricated symmetric supercapacitor with HQ/1M Na2 SO4 electrolyte delivered a maximum energy and power density of 76 Wh/ kg and 5699 W/kg, respectively. Abstract: Supercapacitor (SC) is a promising high power energy storage device for specific applications. In the last few decades, various carbon-based materials with rational surface alterations, and carbon composites have been explored as electrodes for SCs. In addition to the redox behavior of the electrode materials, it has been proposed to use highly reversible redox species in the electrolytes, which can improve the performance of the SCs through redox processes at the electrode-electrolyte interface. Herein, the activated carbon derived from Thespesia Populnea Seeds (TPC) is explored for supercapacitor application in redox additive electrolyte. The electrochemical capacitive performance of TPC was studied using three different redox additives in 1M Na2 SO4 electrolyte. Among the three redox additives, an outstanding specific capacity of 1779 C/g was observed in hydroquinone (HQ)/Na2 SO4, which is superior to K3 [Fe(CN)6 ]/Na2 SO4 (1440 C/g) and FAS/Na2 SO4 (873 C/g) electrolytes. The fabricated TPC symmetric cell in HQ/Na2 SO4 delivered an enhanced electrochemical performance (1096 C/g at 1 A/g) and a maximum specific energy of 76 Wh/kg in HQ/Na2 SO4 . Graphical abstract: Image, graphical abstract