Premium
Synergistic Effect of Nitrogen and Sulfur Dual‐Doping Endows TiO 2 with Exceptional Sodium Storage Performance
Author(s) -
Fan Mengna,
Lin Zhihua,
Zhang Pei,
Ma Xiangdong,
Wu Kaipeng,
Liu Meilin,
Xiong Xunhui
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003037
Subject(s) - heteroatom , materials science , doping , anatase , electrochemistry , diffusion , chemical engineering , conductivity , sodium ion battery , kinetics , ion , sodium , sulfur , nanotechnology , inorganic chemistry , electrode , faraday efficiency , catalysis , optoelectronics , chemistry , organic chemistry , thermodynamics , metallurgy , ring (chemistry) , physics , photocatalysis , quantum mechanics , engineering
Improving the diffusion kinetics of sodium ions within TiO 2 and its intrinsic electronic conductivity is indispensable to enhance the rate capability and long cyclic stability of TiO 2 anodes for sodium‐ion batteries. Although single‐heteroatom doping into TiO 2 has been widely investigated, a comprehensive understanding of the effects of dual‐heteroatoms doping on the sodium storage performance of TiO 2 is still lacking. Herein, nitrogen and sulfur dual‐doping is proposed to achieve a high doping concentration for anatase TiO 2 hollow spheres. Experimental data and theoretical calculations reveal that N doping can efficiently narrow the bandgap of TiO 2 , while S doping is effective in facilitating Na + diffusion within TiO 2 . Thus N and S codoped TiO 2 shows remarkably boosted electronic conductivity, as well as accelerated sodium ion transfer kinetics owing to the synergistic effect of different doping heteroatoms, which leads to exceptional rate performance (307.5 and 156.4 mAh g −1 at 33.5 and 5025 mA g −1 , respectively), and extraordinary cycling stability (90.5% retention over 2400 cycles at 3350 mA g −1 ). The greatly improved electrochemical performance emphasizes the importance of defects engineering in the rational design of advanced battery materials.