A fast and mild in-situ oxidization method to fabricate the nickel–cobalt layered double hydroxides on Ni foam as the high-performance electrode materials

In this work, a fast and mild in-situ oxidization hydrothermal method was developed to fabricate the nickel–cobalt layered double hydroxides (Ni–Co LDHs) on Ni foam. The Ni–Co LDHs with the nanoarrays and nanopetals structures were synthesized by in situ oxidizing Ni foam in a mixed solvent of cobalt chloride hexahydrate (CoCl[Formula: see text]H 2 O) and hydrogen peroxide (H 2 O 2 ) at 90[Formula: see text]C for 3[Formula: see text]h. The electrochemical performance tests indicate the Ni–Co LDHs electrodes have a high areal capacitance value about 17.3[Formula: see text]F/cm 2 at 5.0[Formula: see text]mA/cm 2 . After 1000 cycles at 50[Formula: see text]mA/cm 2 , the as-prepared electrodes have the high capacitance retention of 83%. Thus, the binder-free Ni–Co LDHs with high electrochemical performance are the promising electrode materials for advanced electrochemical storage energy devices including flexible power sources and supercapacitors in modern electronic systems.