Construction and electrochemical performances of the three-dimensional nano NiCo2O4

ABSTRACT

Bilayer NiCo₂O₄/NiCo₂O₄ nanosheet arrays on nickel foam (NF) are fabricated by a two-step solution-based method, which involves in hydrothermal process and chemical bath deposition. Compared with the monolayer NiCo₂O₄/NF electrode, the NiCo₂O₄/NiCo₂O₄/NF displays the unique micro-nanometer hierarchical and porours structure and has excellent pseudocapacitive behaviors in 6 M KOH, which exhibits high specific capacitances of 2363.64 F g^?1 at a constant current density of 0.5 Ag^?1, and 1454.55 F g^?1 at the higher current density of 8 Ag^?1, and shows a favourable cycling stability of 77.5% retention after 1000 cycles.