Interfacial built-in electric field and crosslinking pathways enabling WS_(2)/Ti_(3)C_(2)T_(x) heterojunction with robust sodium storage at low temperature  

作　　者：Jiabao Li Shaocong Tang Jingjing Hao Quan Yuan Tianyi Wang Likun Pan Jinliang Li Shenbo Yang Chengyin Wang 

机构地区：[1]College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,Jiangsu,China [2]Shanghai Key Laboratory of Magnetic Resonance,School of Physics and Electronic Science East China Normal University,Shanghai 200241,China [3]Siyuan Laboratory,Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials,Guangdong Provincial Key Laboratory of Nanophotonic Manipulation,Department of Physics,Jinan University,Guangzhou 510632,Guangdong,China [4]Hongzhiwei Technology(Shanghai)CO.LTD,Shanghai 200241,China

出　　处：《Journal of Energy Chemistry》2024年第2期635-645,I0014,共12页能源化学（英文版）

基　　金：supported by the faculty startup funds from the Yangzhou University;the Natural Science Foundation of Jiangsu Province(BK20210821);the National Natural Science Foundation of China(22102141);the Lvyangjinfeng Talent Program of Yangzhou。

摘　　要：Developing efficient energy storage for sodium-ion batteries(SIBs)by creating high-performance heterojunctions and understanding their interfacial interaction at the atomic/molecular level holds promise but is also challenging.Besides,sluggish reaction kinetics at low temperatures restrict the operation of SIBs in cold climates.Herein,cross-linking nanoarchitectonics of WS_(2)/Ti_(3)C_(2)T_(x) heterojunction,featuring built-in electric field(BIEF),have been developed,employing as a model to reveal the positive effect of heterojunction design and BIEF for modifying the reaction kinetics and electrochemical activity.Particularly,the theoretical analysis manifests the discrepancy in work functions leads to the electronic flow from the electron-rich Ti_(3)C_(2)T_(x) to layered WS_(2),spontaneously forming the BIEF and“ion reservoir”at the heterogeneous interface.Besides,the generation of cross-linking pathways further promotes the transportation of electrons/ions,which guarantees rapid diffusion kinetics and excellent structure coupling.Consequently,superior sodium storage performance is obtained for the WS_(2)/Ti_(3)C_(2)T_(x) heterojunction,with only 0.2%decay per cycle at 5.0 A g^(-1)(25℃)up to 1000 cycles and a high capacity of 293.5 mA h g^(-1)(0.1A g^(-1)after 100 cycles)even at-20℃.Importantly,the spontaneously formed BIEF,accompanied by“ion reservoir”,in heterojunction provides deep understandings of the correlation between structure fabricated and performance obtained.

关 键 词：WS_(2)/Ti_(3)C_(2)T_(x)heterojunction Built-in electric field Ion reservoir Reaction kinetics Sodium storage performance at low temperature 

分 类 号：TM912[电气工程—电力电子与电力传动]