Nitrogen-doped carbon encapsulated in mesoporous TiO2 nanotubes for fast capacitive sodium storage  

作　　者：Baosong Li Shoaib Anwer Xinhua Huang Shaohong Luo Jing Fu Kin Liao 

机构地区：[1]Department of Aerospace Engineering,Khalifa University of Science and Technology,Abu Dhabi,127788,United Arab Emirates [2]Department of Mechanical Engineering,Khalifa University of Science and Technology,Abu Dhabi,127788,United Arab Emirates [3]Department of Biomedical Engineering,Khalifa University of Science and Technology,Abu Dhabi,127788,United Arab Emirates

出　　处：《Journal of Energy Chemistry》2021年第4期202-210,共9页能源化学（英文版）

基　　金：the financial support provided by internal reseach funding of Khalifa University of Science and Technology,United Arab Emirates(Grant No.CIRA-2018-16)。

摘　　要：Controllable synthesis of insertion-type anode materials with beneficial micro-and nanostructures is a promising approach for the synthesis of sodium-ion storage devices with high-reactivity and excellent electrochemical performance.In this study,we developed a sacrificial-templating route to synthesize TiO_(2)@N-doped carbon nanotubes(TiO_(2)@NC-NTs)with excellent electrochemical performance.The asprepared mesoporous TiO_(2)@NC-NTs with tiny nanocrystals of anatase TiO_(2) wrapped in N-doped carbon layers showed a well-defined tube structure with a large specific surface area of 198 m^(2) g^(-1) and a large pore size of~5 nm.The TiO_(2)@NC-NTs delivered high reversible capacities of 158 m A h g^(-1) at 2 C(1 C=335 m A g^(-1))for 2200 cycles and 146 m A h g^(-1) at 5 C for 4000 cycles,as well as an ultrahigh rate capability of up to 40 C with a capacity of 98 m A h g^(-1).Even at a high current density of 10 C,a capacity of 138 m A h g^(-1) could be delivered over 10,000 cycles.Thus,the synthesis of mesoporous TiO_(2)@NC-NTs was demonstrated to be an efficient approach for developing electrode materials with high sodium storage and long cycle life.

关 键 词：TiO2 nanotubes MoO3 template Nitrogen-doped carbon ANODE Sodium-ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ134.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]