3D network structure of Co(OH)2 nanoflakes/Ag dendrites via a one-step electrodeposition for high-performance supercapacitors

Layered Co(OH)(2) nanoflakes are regarded as a promising supercapacitor electrode material owing to its high theoretical speicific capacitance, but the application is limited by low electrical conductivity and weak mechanical strength. In this work, we synthesize a three-dimensional (3D) Co(OH)(2) network structure supported by Ag dendrites on Ni foam by one-step electrodeposition. This 3D structure delivers an excellent supercapacitive performance with a specific capacitance of 2074 F.g(-1) at 1 A g(-1), and an 80.8% capacitance retention after 60,000 charge/discharge cycles at 5 A.g(-1). The test results indicate that introduction of Ag dendrites can provide ideal conductivity and make the 3D structure more durable. Results of this paper provide a feasible method for the practical application of Co(OH)(2) in supercapacitors.