Regulating the core/shell electric structure of Co3O4@Ni-Co LDH on Ni foam through electrodeposition for quasi-solid-state supercapacitor.

A flower-like structured electrode material of Co3O4@Ni-Co layered double hydroxide growing on Ni foam (Co3O4@Ni-Co LDH/NF) was prepared via in situ growth, annealing and electrodeposition process. The Co3O4@Ni-Co LDH/NF electrode was prepared with the optimized conditions of annealing temperature 300 ℃, deposition time 20 minutes and Ni/Co ratio of 1:1. The results showed the as-prepared electrode material exhibited an excellent specific capacitance and great cycling stability. Furthermore, an all-solid-state supercapacitor was assembled using the prepared Co3O4@Ni-Co LDH/NF as the positive electrode and activated carbon on Ni foam (AC/NF) as the negative electrode. the as-assembled device presented a high energy density and power density.