首页|Interfacial built-in electric field and crosslinking pathways enabling WS2/Ti3C2Tx heterojunction with robust sodium storage at low temperature

Interfacial built-in electric field and crosslinking pathways enabling WS2/Ti3C2Tx heterojunction with robust sodium storage at low temperature

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Developing efficient energy storage for sodium-ion batteries(SIBs)by creating high-performance hetero-junctions 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 WS2/Ti3C2Tx heterojunction,featuring built-in electric field(BIEF),have been developed,employing as a model to reveal the positive effect of hetero-junction 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 Ti3C2Tx to layered WS2,spontaneously forming the BIEF and"ion reservoir"at the heterogeneous interface.Besides,the generation of cross-linking pathways further promotes the trans-portation of electrons/ions,which guarantees rapid diffusion kinetics and excellent structure coupling.Consequently,superior sodium storage performance is obtained for the WS2/Ti3C2Tx 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(0.1 A 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 fabri-cated and performance obtained.

WS2/Ti3C2Tx heterojunctionBuilt-in electric fieldIon reservoirReaction kineticsSodium storage performance at low temperature

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

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College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,Jiangsu,China

Shanghai Key Laboratory of Magnetic Resonance,School of Physics and Electronic Science East China Normal University,Shanghai 200241,China

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

Hongzhiwei Technology(Shanghai)CO.LTD,Shanghai 200241,China

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faculty startup funds from the Yangzhou UniversityNatural Science Foundation of Jiangsu ProvinceNational Natural Science Foundation of ChinaLvyangjinfeng Talent Program of Yangzhou

BK2021082122102141

2024

10.1016/j.jechem.2023.10.037

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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