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Lookup NU author(s): Professor Lidija Siller
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Currently, more than 80% of commercial supercapacitors utilize chemically synthesized carbon nanomaterials which are expensive and necessitates non-renewable resources. Employing renewable, environment friendly and naturally available biomass feedstock as precursor for producing carbon materials is a low-cost and sustainable way for designing the electrodes of supercapacitors. In the present study, high surface area hierarchical porous multilayered graphene-like carbon is obtained via room temperature sono-exfoliation of the activated carbon synthesized via simple and environmentally friendly hydrothermal carbonization and potassium bicarbonate activation of waste hazelnut shells as the precursor. The high surface area graphene-like carbon showed excellent electrochemical performance with specific capacitance of 320.9 F g1 at 0.2 A g1 current density and exceptional capacitance retention of 77.8% at 2 A g1 current density after 10 000 cycles in 1 M Na2SO4 electrolyte. Moreover, flexible supercapacitors fabricated using sonoexfoliated graphene-like activated carbon coated stainless steel mesh electrodes and biopolymer gel electrolyte exhibits an outstanding energy density of 38.7 W h kg1 and power density of 198.4 W kg1 . These results show that mechanically exfoliated graphene-like activated carbon derived from hazelnut shells exhibit superior electrochemical performance that can compete with other activated carbon materials used in energy storage devices for real time applications.
Author(s): Reddygunta KKR, Callander R, Siller L, Faulds K, Berlouis L, Ivanturi A
Publication type: Article
Publication status: Published
Journal: International Journal of Energy Research
Issue: ePub ahead of Print
Online publication date: 05/07/2022
Acceptance date: 15/06/2022
Date deposited: 11/07/2022
ISSN (print): 0363-907X
ISSN (electronic): 1099-114X
Publisher: Wiley-Blackwell Publishing Ltd.
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