Acacia auriculiformis–derived bimodal porous nanocarbons via self-activation for high-performance supercapacitors

Bhat, Vinay S. and Jayeoye, Titilope John and Rujiralai, Thitima and Sirimahachai, Uraiwan and Chong, Kwok Feng and Hegde, Gurumurthy (2021) Acacia auriculiformis–derived bimodal porous nanocarbons via self-activation for high-performance supercapacitors. Frontiers in Energy Research, 9 (744133). pp. 1-15. ISSN 2296-598X. (Published)

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Carbon nanomaterials derived from Acacia auriculiformis pods as electrodes for the electrochemical double-layer capacitors were explored. Four pyrolysis temperatures were set (400, 600, 800, and 1,000°C) to understand the role of temperature in biomass pyrolysis via a possible “self-activation” mechanism for the synthesis of carbon materials. The carbon materials synthesized at 800°C (AAC800) were found to exhibit a well-organized hierarchical porous structure, quantified further from N2 adsorption/desorption isotherms with a maximum specific surface area of 736.6 m2/g. Micropores were found to be contributing toward enhancing the specific surface area. AAC800 exhibited a maximum specific capacitance of 176.7 F/g at 0.5 A/g in 6.0 M KOH electrolyte in a three-electrode setup. A symmetric supercapacitor was fabricated using AAC800 as an active material in an organic electrolyte composed of 1.0 M tetraethylammonium tetrafluoroborate (TEABF4) as a conducting salt in the acetonitrile (ACN) solvent. The self-discharge of the cell/device was analyzed from fitting two different mathematical models; the cell also exhibited a remarkable coulombic efficiency of 100% over 10,000 charge/discharge cycles, retaining ∼93% capacitance at 2.3 V.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Self-activation; Pyrolysis; Porous carbon; Supercapacitors; Organic electrolyte
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 18 Nov 2021 02:51
Last Modified: 18 Nov 2021 02:51
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