Robust S-doped TiO2@N,S-codoped carbon nanotube arrays as free-binder anodes for efficient sodium storage

• 作者: Guangzeng Liu Man Huang Zhengchunyu Zhang Baojuan Xi Haibo Li Shenglin Xiong
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（2）
• 页码范围: 175-184
• 页数: 10页
• 语种: 英文

摘要

Titanium dioxide (TiO2) has been investigated broadly as a stable,safe,and cheap anode material for sodium-ion batteries in recent years.However,the poor electronic conductivity and inherent sluggish sodium ion diffusion hinder its practical applications.Herein,a self-template and in situ vulcanization strategy is developed to synthesize self-supported hybrid nanotube arrays composed of nitrogen/sulfur-codoped carbon coated sulfur-doped TiO2 nanotubes (S-TiO2@NS-C) starting from H2Ti2Os·H2O nanoarrays.The S-TiO2@NS-C composite with one-dimensional nano-sized subunits integrates several merits.Specifically,sulfur doping strongly improves the Na+ storage ability of TiO2@C-N nanotubes by narrowing the bandgap of original TiO2.Originating from the nanoarrays structures built from hollow nanotubes,carbon layer and sulfur doping,the sluggish Na+ insertion/extraction kinetics is effectively improved and the volume variation of the electrode material is significantly alleviated.As a result,the S-TiO2@NS-C nanoarrays present efficient sodium storage properties.The greatly improved sodium storage performances of S-TiO2@NS-C nanoarrays confirm the importance of rational engineering and synthesis of hollow array architectures with higher complexity.