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Valorization of lignin waste: high electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes

Sangchoom, Wantana; Walsh, Darren A.; Mokaya, Robert


Wantana Sangchoom

Professor of Chemistry


This report describes the utilization of waste lignin-derived activated carbons (LACs) as high-energy/high-power electrode materials for electric double layer capacitors(EDLCs). The influence of carbon-pore structure on the capacitance of the LACs in two aqueous (H2SO4 and KCl) and two ionic liquid (1-ethyl-3-methylimidazolium ethylsulfate, [EMIm][EtSO4], and 1-butyl-3-methylimidazolium tetrafluoroborate, [BMIm][BF4]) electrolytes is evaluated. In EDLCs containing aqueous H2SO4 as electrolyte, the LACs exhibit specific capacitances of up to 223 F/g and good cycling stability, with energy density of 5.0 Wh/kg at a power density of 200 W/kg. EDLCs containing KCl achieved a specific capacitance of 203 F/g, and energy density of 7.1 Wh/kg at a power density of 510 W/kg. The specific capacitances of the LACs in [EMIm][EtSO4] and [BMIm][BF4] were up to 147 F/g and 175 F/g, respectively. The energy density in the IL electrolytes, is up to 25 Wh/kg at power density of 500 W/kg, and 16.4 Wh/kg at 15 kW/kg. We demonstrate that the electrochemical performance of the LACs depends not only the surface area and pore size, but also on the pore-wall thickness.


Sangchoom, W., Walsh, D. A., & Mokaya, R. (2018). Valorization of lignin waste: high electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes. Journal of Materials Chemistry A, 6(38), (18701-18711). doi:10.1039/c8ta07632d. ISSN 2050-7488

Journal Article Type Article
Acceptance Date Sep 7, 2018
Online Publication Date Sep 7, 2018
Publication Date Oct 2, 2018
Deposit Date Oct 5, 2018
Publicly Available Date Sep 8, 2019
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 38
Pages 18701-18711
Keywords Renewable Energy, Sustainability and the Environment; General Materials Science; General Chemistry
Public URL
Additional Information This document is Similarity Check deposited; : Supplementary Information; : Darren A. Walsh (ORCID); : Robert Mokaya (ORCID); : Single-blind; : Received 6 August 2018; Accepted 7 September 2018; Accepted Manuscript published 7 September 2018; Advance Article published 24 September 2018; Version of Record published 2 October 2018


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