Self-supported NiCo2O4 nanoflake arrays on nickel foam are prepared by a facile hydrothermal method. The obtained NiCo2O4 nanoflakes with thicknesses of similar to 25 nm grow vertically to the nickel foam substrate and form an interconnected porous network with pore diameters of 50-500 nm. As anode material of LIBs, the NiCo2O4 nanoflake arrays show a high initial coulombic efficiency of 76%, as well as good cycling stability with a capacity of 880 mAh g(-1) at 0.5 A g(-1), and 523 mAh g(-1) at 1.5 A g(-1) after 50 cycles. As the cathode of alkaline batteries, a high capacity of 95 mAh g(-1) is achieved at 2 A g(-1) and 94% retention is maintained after 10,000 cycles. The superior electrochemical performance is mainly due to the unique nanoflake arrays structure with large surface area and shorter diffusion length for mass and charge transport. (C) 2014 Elsevier Ltd. All rights reserved.