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

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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 the 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 the electrolyte, the LACs exhibit specific capacitances of up to 223 F g−1 and good cycling stability, with an energy density of 5.0 W h kg−1 at a power density of 200 W kg−1. EDLCs containing KCl achieved a specific capacitance of 203 F g−1, and an energy density of 7.1 W h kg−1 at a power density of 510 W kg−1. The specific capacitances of the LACs in [EMIm][EtSO4] and [BMIm][BF4] were up to 147 F g−1 and 175 F g−1, respectively. The energy density in the IL electrolytes is up to 25 W h kg−1 at a power density of 500 W kg−1 and 16.4 W h kg−1 at 15 kW kg−1. 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.

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

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

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

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