Preparation of TiO2(B) @anatase hybrid nanowires and their lithium storage properties
Novel anatase@TiO2(B) hybrid nanowires have been synthesized by a facile aqueous alkali hydrothermal method, followed by acid washing and heating. The nanowires have a bicrystalline structure consisting of a TiO2(B) core encapsulated in an anatase shell. This hybrid nanowire has one column of entangled interface between the (001) plane of anatase and the (100) plane of TiO2(B), where a high conductivity column layer or belt comes into being, owing to the one way transfer of electron-hole carriers during the heterojunction formation. The as-prepared anatase@TiO2(B) hybrid nanowires deliver a highly reversible capacity of 196 mAhg-1 after 100 cycles at 30 mAg-1 (0.1C) and excellent rate capability as high as 125 mAhg-1 when cycled at 4500 mAg-1 (15C). Owing to the excellent electrochemical performance, anatase@TiO2(B) hybrid nanowires could be promising anode materials for lithium ion batteries.