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-Co3O4 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-Co3O4 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 Co3O4 film (Ni-Co3O4 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.
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