Figure 4
(a) Initial specific capacitance according to the LSMCO content (wt%) at the scan rate of 5 mV s−1. Markers and error bars represent the average and standard deviation, respectively. (b) The specific capacitance of L25G70, L50G45, L75G20, and GNs after the cycling test at 20 mV s-1, confirming the electrochemical stability of the LSMCO-based electrodes. (c) Metal concentrations dissolved in 1 M H2SO4 electrolyte from LSMCO-based electrodes, as measured using inductively coupled plasma-optical emission spectrometry (ICP-OES). (d) Variation of the specific capacitance with the current density for all electrodes. (e) Ragone plots. (f) Nyquist plots of all electrodes.
