材料科学
假电容
阳极
氧气
插层(化学)
硼
化学工程
钠
氧气储存
兴奋剂
纳米技术
无机化学
电化学
电极
超级电容器
物理化学
化学
光电子学
有机化学
工程类
冶金
作者
Jinghao Huo,Yijie Ren,Guoqiang Zhang,Shouwu Guo
标识
DOI:10.1002/admi.202201160
摘要
Abstract TiO 2 is an intercalation pseudocapacitive material with low potential and minor structural changes during the sodium storage process. However, the intrinsic electronic conductivity and ionic diffusion kinetics are not unsatisfactory for ultrafast sodium storage. Defect engineering plays a pivotal part in improving the sodium storage kinetics of TiO 2 anode materials. Now the common defect regulation methods are complicated. Herein, a simple NaBH 4 reduction method is proposed to produce rich oxygen vacancies and boron doping in nitrogen‐doped TiO 2 /C mesoporous nanofibers, and the finally obtained oxygen vacancies (OVs)‐rich TiO 2 /C nanofibers (TC‐OVs) also build internal vertical channels. This particular structure of TC‐OVs favors fast transport for electrons and ions, resulting in ultrafast rate capability (156 mAh g −1 , 2 A g −1 ) and long lifespan (139 mAh g −1 , 1000 cycles, 1.0 A g −1 ). The inspiring sodium storage performance of TC‐OVs benefits from the high pseudocapacitance contribution (94%, 5.0 mV s −1 ). This work provides a method to adjust defects and structures of TiO 2 electrode materials for ultrafast chemical energy storage.
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