Table 2.

Comparison among various types of supercapacitors.^{[ 45} , ⁴⁶ , ^{47 ]}

Parameters	Electric double layer capacitor (EDLC)	Pseudo‐capacitor (PC)	Hybrid capacitor (HC)
Charge storage mechanism	Physical – Non‐faradic/electrostatic, electrical charge store at electrode/electrolyte interface	Chemical‐ faradic, reversible redox reaction	Physical and chemical (both faradic and non‐faradic)
Electrode materials	Carbonaceous compounds	Conductive polymers and metal oxides	Combination of EDLC and PC‐type materials
Specific capacitance [Fg−1]	Lower (200–300)	Higher (200–1340)	Higher (50–1893)
Energy density [Wh kg−1]	Low (6.8–12)	High (167–223)	High (132–231)
Cyclability [cycles]	High (100 000)	Low (5000)	Medium (12 000)
Capacitance retention [%]	60–100	52–96	80–95