Ag2O loaded NiO ball-flowers for high performance supercapacitors

Abstract Ag 2 O-loaded NiO ball-flowers were synthesized via a simple one-step hydrothermal method. The ball-flower architecture is constructed by porous nanosheets modified by Ag 2 O. During the charge-discharge processes Ag 2 O can convert to metallic Ag to enhance the conductivity of electrode materials. The unique hierarchical ball-flower architectures can provide more active sites and diffusion paths for ions, increasing the utilization rate of electrode materials. Electrochemical measurements reveal that electrode materials based on Ag 2 O/NiO nanocomposites exhibited high specific capacitance value (556 F g −1 ) at a current density (1 A g −1 ), as well as an excellent capacitance retention of 103% after 1000 cycles.