Multi-sized anatase/bronze nanoribbons with heterojunction structure for improved sodium storage

In view of the inferior specific capacity and low rate capability of titanium dioxide with individual-phase, multi- sized anatase/bronze nanoribbons with heterojunction structure are prepared by a hydrothermal ion exchange method in this study. The effects of calcination temperature on the crystallographic structure, architecture morphology and electrochemical properties of anatase/bronze nanoribbons are investigated. The results show that the prepared anatase/bronze nanoribbons present one-dimensional nanostrips structure with a bandwidth of about 100 nm, and nanofibers are attached to the surface. It is found that calcination temperature is critic in the crystallographic structure, architecture morphology and electrochemical performance of anatase/bronze nano- ribbons. The multi-sized anatase/bronze nanoribbons prepared at 300 degrees C show improved electrochemical performance with superior specific capacity, outstanding rate capability and long cycle life. At the current density of 200 mA center dot g-1, the specific discharge capacity of the first circle reaches 728 mAh center dot g- 1 . Moreover, the specific discharge capacity remains 92.5 mAh center dot g- 1 after 2000 charge-discharge cycles 2000 mA center dot g-1. The design of anatase/bronze heterojunction structure supplies a potential strategy to develop titanium-based anode with advantageous electrochemical performance.