气候变化领域集成服务门户(CCPortal): Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage

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DOI	10.1016/j.scib.2020.05.007
	Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage
	Dong Y.; Liu Y.; Hu Y.; Ma K.; Jiang H.; Li C.
发表日期	2020
ISSN	20959273
起始页码	1470
结束页码	1478
卷号	65 期号:17
英文摘要	Heterostructures have lately been recognized as a viable implement to achieve high-energy Li-ion batteries (LIBs) because the as-formed built-in electric field can greatly accelerate the charge transfer kinetics. Herein, we have constructed the Mott-Schottky heterostructured VS2/MoS2 hybrids with tailorable 1T/2H phase based on their matchable formation energy, which are made of metallic and few-layered VS2 vertically grown on MoS2 surface. The density functional theory (DFT) calculations unveil that such heterojunctions drive the rearrangement of energy band with a facilitated reaction kinetics and enhance the Li adsorption energy more than twice compared to the MoS2 surface. Furthermore, the VS2 catalytically expedites the Li–S bond fracture and meantime the enriched Mo6+ enables the sulfur anchoring toward the oriented reaction with Li+ to form Li2S, synergistically enhancing the reversibility of electrochemical redox. Consequently, the as-obtained VS2/MoS2 hybrids deliver a very large specific capacity of 1273 mAh g−1 at 0.1 A g−1 with 61% retention even at 5 A g−1. It can also stabilize 100 cycles at 0.5 A g−1 and 500 cycles at 1 A g−1. The findings provide in-depth insights into engineering heterojunctions towards the enhancement of reaction kinetics and reversibility for LIBs. © 2020 Science China Press
关键词	Heterostructure High-energy density Interface effect Li-ion batteries VS2/MoS2
英文关键词	Association reactions; Charge transfer; Density functional theory; Electric fields; Heterojunctions; Kinetics; Layered semiconductors; Lithium compounds; Lithium-ion batteries; Molybdenum compounds; Built-in electric fields; Charge transfer kinetics; Electrochemical redox; Formation energies; Li adsorptions; Lithium storages; Mott-Schottky; Specific capacities; Reaction kinetics
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207026
作者单位	Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou, 510275, China
推荐引用方式 GB/T 7714	Dong Y.,Liu Y.,Hu Y.,et al. Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage[J],2020,65(17).
APA	Dong Y.,Liu Y.,Hu Y.,Ma K.,Jiang H.,&Li C..(2020).Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage.Science Bulletin,65(17).
MLA	Dong Y.,et al."Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage".Science Bulletin 65.17(2020).