The combination of excellent mechanical properties and electrochemical performances of Ni-based cathodes is fascinating and challenging for NiÀ Zn batteries. Herein, a novel and eco-friendly strategy of the cycle of Ni 2 + hydrolysis and H + etching process at Ni/solution interface under moderate temperature is demonstrated to synthesize the three-dimen-sional NiO nanosheets array supported on pressed Ni foam electrode (denoted as NiO/PNF). The as-prepared NiO/PNF electrode exhibits outstanding mechanical flexibility and stability with a capacity of 5.08 mAh cm À 3 . The assembled NiO/PNF j j Zn battery presents peak energy and power densities up to 5.2 mW h cm À 3 and 1944.4 mW cm À 3 .