TiO2 nanotube/g-C3N4/graphene composite as high performance anode material for Na-ion batteries. (February 2021)

• Record Type: Journal Article
• Authors: Wang, Shuaihao; Zhu, Yuanyi; Jiang, Meng; Cui, Jinlong; Zhang, Yongqiang; He, Wenxiu
• Is Part Of: Vacuum. Volume 184(2021)
• Publication Date: 2021-02
• Subjects: TiO2 nanotube -- G-C3N4 -- Graphene -- Alkaline hydrothermal method -- NIBs anode material; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109926
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: To improve the electrochemical kinetics and alleviate the structural collapse of TiO2 in the process of charge/discharge, TiO2 nanotubes (TiO2 NT) anchored on a large-area graphitic carbon nitride/reduced graphene oxide (g-C3 N4 /RGO) hybrid nanosheets have been designed by alkaline hydrothermal method. This unique architecture ensures the uniform distribution of TiO2 NT and inhibits the natural tendency to agglomeration of RGO to a large extent. When applied as anode material for Na-ion batteries (NIBs), the resultant sample delivers high reversible capacities of 138.5 mAh g −1 after 244 cycles at 0.1 A g −1 and good rate capability (103.3 mAh g −1 at 0.8 A g −1 ). These excellent sodium storage behaviors are attributed to the double coating effect of g-C3 N4 /RGO nanosheets on TiO2 nanotubes, which can reduce the volume change in the cycle. Therefore, TiO2 nanotubes/graphite phase carbon nitride/graphene composite (TiO2 NT/g-C3 N4 /RGO) should be a promising and attractive NIBs anode material. Highlights: TiO2 NT/g-C3 N4 /RGO composite is prepared by alkaline hydrothermal. The g-C3 N4 /RGO support causes a superior electrochemical performance for sodium storage. The sample retains a capacity of 138.5 mAh g −1 after 244 cycles at 0.1 A g −1 .