Phosphorus‐Modulation‐Triggered Surface Disorder in Titanium Dioxide Nanocrystals Enables Exceptional Sodium‐Storage Performance,Angewandte Chemie International Edition

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Phosphorus‐Modulation‐Triggered Surface Disorder in Titanium Dioxide Nanocrystals Enables Exceptional Sodium‐Storage Performance
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-02-15 , DOI: 10.1002/anie.201813721
Qingbing Xia ₁ , Yang Huang ₂ , Jin Xiao _{3,

4} , Lei Wang ₂ , Zeheng Lin ₁ , Weijie Li ₁ , Hui Liu ₅ , Qinfen Gu ₆ , Hua Kun Liu ₁ , Shu‐Lei Chou ₁

Affiliation

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 TiO₂ nanocrystals 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⁻¹ at 50 C and a strong long‐term cycling stability without significant capacity decay up to 5000 cycles at 30 C.

中文翻译：

二氧化钛纳米晶体中的磷调制触发表面紊乱可实现出色的钠存储性能

结构调制和表面工程对于快速和有效的电荷存储具有显着的优势。在本文中，我们提出了一种磷调制策略，该策略同时实现了内部原子级P掺杂的表面结构无序化，以提高TiO ₂的Na ⁺储存动力学。发现P调节的TiO ₂纳米晶体显示出良好的电子结构，并增强了结构稳定性，Na ⁺转移动力学以及表面电化学反应性，从而产生了真正的零应变特性，在此过程中体积变化仅约0.1％。 Na ⁺插入/提取，以及特殊的Na ⁺存储性能包括在50 C时具有210 mAh g ^-1的超高倍率容量以及强大的长期循环稳定性，而在30 C时高达5000次循环不会出现明显的容量衰减。

更新日期：2019-02-15

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