Figure 6 | NPG Asia Materials

Figure 6

From: Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

Figure 6

Electrochemical performance of NiCo2O4/AC asymmetric supercapacitor. Electrochemical evaluation of the NiCo2O4/activated carbon asymmetric supercapacitor device: (a) Comparative CV curves of NiCo2O4 and activated carbon electrodes performed in a three-electrode system. (b) C–V and (c) discharge curves of the asymmetric supercapacitor. (d) Calculated specific capacitance as a function of current density. (e) Cycling stability of the full cell. After 2000 cycles, 89.9% capacitance can still be retained, which is consistent with the results in the three-electrode system (90.5%). (f) electrochemical impedance spectroscopy curves measured before and after 2000 charge–discharge cycles.

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