Phosphorus-Modulation-Triggered Surface Disorder in Titanium Dioxide Nanocrystals Enables Exceptional Sodium-Storage Performance
Phosphorus-Modulation-Triggered Surface Disorder in Titanium Dioxide Nanocrystals Enables Exceptional Sodium-Storage Performance
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二氧化钛纳米晶体中磷调制引发的表面紊乱实现了卓越的钠存储性能
DOI：
10.1002/anie.201813721
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Chou Shu-Lei
中科院分区：
文献类型：
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作者：
Xia Qingbing;Huang Yang;Xiao Jin;Wang Lei;Lin Zeheng;Li Weijie;Liu Hui;Gu Qinfen;Liu Hua Kun;Chou Shu-Lei
结构调制和表面工程对于快速和有效的电荷存储具有显著的优势。在此，我们提出了一种磷调制策略，该策略同时实现表面结构无序和内部原子级P掺杂，以提高TiO 2的Na+存储动力学。研究发现，P-调制的TiO 2纳米晶体具有良好的电子结构，增强的结构稳定性，Na+转移动力学以及表面电化学反应性，导致真正的零应变特性，在Na+插入/提取过程中只有约0.1%的体积变化，以及卓越的Na+存储性能，包括在50 C下210 mAh g− 1的倍率容量和在30 C下长达5000次循环的长期循环稳定性，而没有显著的容量衰减。
Structural modulation and surface engineering have remarkable advantages for fast and efficient charge storage. Herein, we present a phosphorus modulation strategy which simultaneously realizes surface structural disorder with interior atomic‐level P‐doping to boost the Na+storage kinetics of TiO2. It is found that the P‐modulated TiO2nanocrystals exhibit a favourable electronic structure, and enhanced structural stability, Na+transfer kinetics, as well as surface electrochemical reactivity, resulting in a genuine zero‐strain characteristic with only approximately 0.1 % volume variation during Na+insertion/extraction, and exceptional Na+storage performance including an ultrahigh rate capability of 210 mAh g−1at 50 C and a strong long‐term cycling stability without significant capacity decay up to 5000 cycles at 30 C.