High content anion(S/Se/P)doping assisted by defect engineering with fast charge transfer kinetics for high-performance sodium ion capacitors

作     者：Xinglan Deng Kangyu Zou Roya Momen Peng Cai Jun Chen Hongshuai Hou Guoqiang Zou Xiaobo Ji 邓杏兰;邹康宇;Roya Momen;蔡鹏;陈军;侯红帅;邹国强;纪效波

作者机构：College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China State Key Laboratory of Powder MetallurgyCollege of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第18期

页      面：1858-1868,M0003页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Key Research and Development Program of China(2019YFC1907805) the National Natural Science Foundation of China(52004338) Hunan Provincial Natural Science Foundation(2020JJ5696) Guangdong Provincial Department of Natural Resources(2020-011) 

主　　题：Vacancy engineering Anion doping Charge transfer kinetics Sodium ion capacitors Titanium dioxide 

摘      要：The rate-determining process for sodium storage in TiO2 is greatly depending on charge transfer happening in the electrode materials owing to its inferior diffusion coefficient and electronic *** from reducing the diffusion distance of ion/electron,the increasement of ionic/electronic mobility in the crystal lattice is also very important for charge ***,an oxygen vacancy(OV)engineering assisted in high-content anion(S/Se/P)doping strategy to enhance charge transfer kinetics for ultrafast sodium-storage performance is *** calculations indicate that OV-engineering evokes spontaneous S doping into the TiO2 phase and achieves high dopant concentration to bring about impurity state electron donor and electronic delocalization over S occupied sites,which can largely reduce the migration barrier of Na+.To realize the speculation,high-content anion doped anatase TiO2/C composites(9.82 at%for S in A-TiO2–x-S/C)are elaborately *** optimized A-TiO2–x-S/C anode exhibits extraordinarily high-rate capability with 209.6 mAh g-1at 5000 mA *** assembled sodium ion capacitors deliver an ultrahigh energy density of 150.1 Wh kg-1at a power density of 150 W kg-1when applied as anode *** work provides a new strategy to realize high content anion doping concentration,and enhances the charge transfer kinetics for TiO2,which delivers an efficient approach for the design of electrode materials with fast kinetic.