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| feedstock | activation | electrolyte | capacitance (F·g–1/A·g–1) | references |
|---|---|---|---|---|
| alkali lignin | 6 M KOH | 104/0.5 | this work | |
| alkali lignin | 6 M KOH | 64/0.4 | (39) | |
| kraft lignin | 1 M H2SO4 | 91/0.5 | (40) | |
| ethanol-extracted lignin | 1 M H2SO4 | 35/0.5 | (40) | |
| alkali lignin | 1 M H2SO4 | 53/0.5 | (40) | |
| sodium-lignosulfonate | 6 M KOH | 17/1.0 | (41) | |
| woody lignin | KOH | 1 M H2SO4 | 48–87/0.5 | (42) |
| kraft lignin | KOH | 1 M NaCl | 73/0.5 | (43) |
