@article { , title = {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 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.}, doi = {10.1039/c8ta07632d}, eissn = {2050-7496}, issn = {2050-7488}, issue = {38}, journal = {Journal of Materials Chemistry A}, pages = {18701-18711}, publicationstatus = {Published}, publisher = {Royal Society of Chemistry}, url = {https://nottingham-repository.worktribe.com/output/1148806}, volume = {6}, keyword = {Renewable Energy, Sustainability and the Environment, General Materials Science, General Chemistry}, year = {2018}, author = {Sangchoom, Wantana and Walsh, Darren A. and Mokaya, Robert} }