Abstract
AbstractHeterostructure 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 of VS2, the obtained VS2/VOx electrode exhibits superior cycling stability and rate properties. In particular, the VS2/VOx anode shows a high capacity of 878.2 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.