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- Title
Construction of VS<sub>2</sub>/VO<sub>x</sub> Heterostructure via Hydrolysis-Oxidation Coupling Reaction with Superior Sodium Storage Properties.
- Authors
Zhang, Yuxiang; Chen, Yangziyu; Jiang, Yan; Wang, Jing; Zheng, Xiangyi; Han, Bo; Xia, Kaisheng; Gao, Qiang; Cai, Zhao; Zhou, Chenggang; Sun, Ruimin
- Abstract
Heterostructure engineering is one of the most promising modification strategies for reinforcing Na+ storage of transition metal sulfides. Herein, based on the spontaneous hydrolysis-oxidation coupling reaction of transition metal sulfides in aqueous media, a VOx layer is induced and formed on the surface of VS2, realizing tight combination of VS2 and VOx at the nanoscale and constructing homologous VS2/VOx heterostructure. Benefiting from the built-in electric field at the heterointerfaces, high chemical stability of VOx, and high electrical conductivity ofVS2, the obtained VS2/VOx electrode exhibits superior cycling stability and rate properties. In particular, the VS2/VOx anode shows a high capacity of878.2 mAh g-1 after 200 cycles at 0.2 A g-1. It also exhibits long cycling life (721.6 mAh g-1 capacity retained after 1000 cycles at 2 A g-1) and ultrahigh rate property (up to 654.8 mAh g-1 at 10 A g-1). Density functional theory calculations show that the formation of heterostructures reduces the activation energy for Na+ migration and increases the electrical conductivity of the material, which accelerates the ion/electron transfer and improves the reaction kinetics of the VS2/VOx electrode.
- Subjects
ELECTRIC conductivity; OXIDATION-reduction reaction; CHEMICAL stability; METAL sulfides; HETEROJUNCTIONS; SODIUM ions
- Publication
Advanced Functional Materials, 2023, Vol 33, Issue 12, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202212785