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

Abstract

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 up to 223 F/g and good cycling stability over 1000 cycles, with energy density of 5.0 Wh/kg at a power density of 200 W/kg. While EDLCs containing KCl achieved a specific capacitance of 203 F/g, they had higher energy density than those containing H2SO4, reaching 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 in the range 6-147 F/g and 12-175 F/g, respectively. The energy density of the LAC electrodes in IL electrolytes reaches 25 Wh/kg and power density of 500 W/kg at 1.0 A/g, or 16.4 Wh/kg and power density of 15 kW/kg at 10 A/g. We demonstrate that the capacitances of the LACs depend not only the surface area and pore size, but also on the pore-wall thickness.

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Publication details

The article was received on 06 Aug 2018, accepted on 07 Sep 2018 and first published on 07 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07632D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Valorization of lignin waste: High electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes

    W. Sangchoom, D. Walsh and R. Mokaya, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07632D

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