Interconnected Na2Ti3O7 nanotube/g-C3N4/graphene network as high performance anode materials for sodium storage. (31st July 2020)

• Record Type: Journal Article
• Authors: Wang, Shuaihao; Zhu, Yuanyi; Jiang, Meng; Cui, Jinlong; Zhang, Yongqiang; He, Wenxiu
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 38(2020)
• Page Start: 19611
• Page End: 19619
• Publication Date: 2020-07-31
• Subjects: Network structures -- Na2Ti3O7 nanotube -- g-C3N4 -- Graphene -- Sodium ion batteries; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.05.133
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The high-performance anode electrode material has been the major challenge of sodium ion batteries (SIBs). In this paper, we report a facile strategy to fabricate three-dimensional (3D) network structures where Na2 Ti3 O7 nanotube species are anchored to the composites composed of graphite phase carbon nitride (g-C3 N4 ) and ultrafine graphene, and demonstrates the excellent electrochemical performance as a sodium storage material. The good integration of g-C3 N4 and graphene provides more active sites for Na + insertion/extraction and accommodates the volume expansion of Na2 Ti3 O7 . The Na2 Ti3 O7 nanotube into these carbon matrix can effectively shorten the transport paths of Na + . Therefore, the Na2 Ti3 O7 NT/g-C3 N4 /RGO electrode exhibits a superior cycling efficiency and rate capability. When used as the anode material of sodium half-cell, the reversible capacity of the synthesized Na2 Ti3 O7 NT/g-C3 N4 /RGO composite is as high as 210.8 mAh g −1 after 300 cycles at 0.1 A g −1 and good rate capability (104.7 mAh g −1 at 2 A g −1 ). After the 50 cycle, the corresponding coulomb efficiency remained basically stable and is up to 98%. In addition, the half-cell provides high energy density of 364 Wh kg −1 at power density of 0.048 W kg −1 . Highlights: Na2 Ti3 O7 NT/g-C3 N4 /RGO Network is prepared by alkaline hydrothermal. The sample retains a capacity of 210.8 mAh g −1 after 300 cycles at 0.1 A g −1 . The g-C3 N4 /RGO support causes a better cycling performance for sodium storage.