Synthesis of porous nickel networks supported metal oxide nanowire arrays as binder-free anode for lithium-ion batteries

Abstract Directional design/preparation of porous metal/metal oxides composite arrays is critical for construction of advanced optical-electrochemical devices. Herein we report three-dimensional (3D) porous Ni networks supported cobalt oxide nanowire arrays (Ni-Co 3 O 4 NWs) by combining electro-deposition and hydrothermal process. 3D Ni networks with porous branches and interconnected pores are well formed and used as the skeleton for the growth of cobalt oxide nanowire arrays. High porosity and integrated growth are combined in the composite electrode. Due to the unique composite architecture, the Ni-Co 3 O 4 NWs electrode exhibits higher discharge capacities, better cycling stability (714 mAh g −1 at 0.5 A g −1 after 100 cycles), and enhanced rate capability, as compared to the Ni networks supported dense Co 3 O 4 film (Ni-Co 3 O 4 dense film). The proposed method is useful for construction of other porous metal/metal oxide composite films for application in electrochemical catalysis, energy storage and sensing.