The supercapacitor electrodes were prepared by mixing the activated carbon sample (85 wt.%), with polyvinylidene fluoride (PVdF)
(5 wt.%, as binder) and carbon black (CB) (10 wt.%, as conductive
additive), using N-methyl-2-pyrrolidone (NMP) as a solvent. The
resultant slurry was sprayed on to the stainless steel plate.