Fig. 4. The electrochemical properties of g-C3N4, CuCo2O4 and g-C3N4/CuCo2O4. (A)–(C) The CV curves of g-C3N4 (A), CuCo2O4 (B), and g-C3N4/CuCo2O4 (C). (D)–(F) GCD curves of g-C3N4 (D), CuCo2O4 (E), and g-C3N4/CuCo2O4 (F). (G) The relationship between log(v) and log(i) of g-C3N4/CuCo2O4 for the redox peaks in the CV curves for a 6.0 M KOH electrolyte. (H) Histograms of the capacitance contributions from the CV curve of g-C3N4/CuCo2O4. (I) Relative contribution of capacitance. (J) The specific capacities of CuCo2O4 and g-C3N4/CuCo2O4 under different discharge current densities and inset showing energy density and power density. (K) The cycling stabilities of CuCo2O4 and g-C3N4/CuCo2O4 electrodes. (L) EIS spectra of g-C3N4, CuCo2O4 and g-C3N4/CuCo2O4 electrodes.
