Electrodeposited nickel aluminum-layered double hydroxide on Co₃O₄ as binder-free electrode for supercapacitor

Here, we report a heterostructured core–shell electrode consists of cobalt oxide (Co₃O₄ ) nanowire core and nickel aluminum (NiAl)-layered double hydroxide (NiAl-LDH; herein Co₃O₄@LDH) nanosheet shell grown on nickel foam as advanced electrode for supercapacitor. Benefiting from the core–shell configuration and smart hybridization, the optimized Co₃O₄@LDH core–shell electrode exhibits a high capacitance of 2011 Fg⁻¹ at 2Ag⁻¹ and remains 1455 Fg⁻¹ at 40 Ag⁻¹ , which outperforms the electrochemical performance of individual component of Co₃O₄ (720 Fg⁻¹ at 2 Ag⁻¹). A hybrid supercapacitor using Co₃O₄@LDH as positive electrode and carbon nanotube as negative electrode delivers an energy density of 18.1 Whkg⁻¹ at a power density of 375 kWkg⁻¹ at a current density of 0.5 Ag⁻¹ . Smart hybridization of core–shell electrode shows great promise as advanced electrode materials for supercapacitor with high electrochemical performance.