Electrodeposition of Ni–Co double hydroxide composite nanosheets on Fe substrate for high‐performance supercapacitor electrode

In this work, Ni–Co double hydroxide composite nanosheets with network structure grown on conductive substrate of Fe foil was synthesised by a facile electrochemical deposition method. This structure is responsible for high electrochemical performance with specific capacitance of 853.7 F g −1 at the current density of 1.0 A g −1 and long‐term cycling stability of 85% capacitance retention at 4 A g −1 after 1000 cycles. These results suggest that low‐cost Fe foil can be used as effective collector for high performance supercapacitors.