Fig. 3
Electrochemical properties of the LSMCS electrode. a Cyclic voltammetry (CV) of the electrode at different potential windows. b, c CV curves of the electrode at a potential window of 1.6 V under various scan rates from 10 to 2000 mV s−1. d Galvanostatic charge–discharge curves of the electrode at various current densities. e Areal capacitance versus scan rate; inset shows areal capacitance versus current density. f Nyquist plot for the electrode; inset shows a zoom-in of the high-frequency part.
