Fig. 7

Cyclic voltammetry (CV) analysis of sea urchin-like NiCo2O4 anodes in the voltage range of 0.005–3.0 V with a scanning rate of 0.01 mV s−1
Cyclic voltammetry (CV) analysis of sea urchin-like NiCo2O4 anodes in the voltage range of 0.005–3.0 V with a scanning rate of 0.01 mV s−1