Fig. 6

a CV curves of Co-Cl(NiE) at various scan rates. b Galvanostatic charge and discharge curve of Co-ClNWs(NiE) at 1 A/g (inset: GCD curve of nickel foam with the same current of Co-ClNWs(NiE) at 1A/g). c GCD curves of Co-ClNWs(NiE) at various current densities. d Long cyclic performance and capacitance retention of Co-ClNWs(NiE) at current densities of 8 A/g. e Average specific capacitance at various discharge current densities. f EIS spectra of Co-ClNWs(NiE) before and after electrochemical test over the frequency range from 100 kHz to 10 mHz. g CV curves of Co-ClNWs(NiE) and AC at a scan rate of 20 mV/s. h CV curves of the as-fabricated Co-ClNWs(NiE)//AC ASC device at various scan rates and the corresponding GCD curves (i) with different current densities