Calculation of specific capacitance, energy density, and power density of the composite-80.

Current density (A g−1)	Discharge time (s)	Specific capacitance (F g−1)	Energy density (F V2 g−1)	Power density (F V2 g−1 s−1)
2	179.5	448.7	143.6	0.8
5	56.5	353.1	113	2
8	31	310	99.2	3.2
10	24.5	306.2	98	9.8
15	14.5	271.8	87	6
20	6	150	48	2.4
25	4.5	140.6	45	1.8