Table 1.

Comparison between the physicochemical properties of base materials used in the supercapacitor. Adapted from reference [252].

Physicochemical Properties	Carbon Materials	Metal Oxides	Conducting Polymers
Non-faradic capacitance	xxxx	xx	xx
Faradic capacitance	o	xxxx	xxxx
Conductivity	xxxx	x	xxxx
Energy density	x	xxx	xx
Power density	xxx	x	xx
Cost	xx	xxx	xx
Chemical stability	xxxx	x	xxx
Cycle life	xxxx	xx	xx
Easy fabrication	xx	x	xxx
Flexibility	xx	o	xxx

Very high: xxxx, high: xxx, medium xx, low x, very low o.