Multi-yolk ZnSe/2(CoSe2)@NC heterostructures confined in N-doped carbon shell for high-efficient sodium-ion storage

Transition metal selenides with low pollution, high chemical stability and high theoretical capacity are regarded as the most prospective candidate materials for sodium ions storage. However, its poor conductivity, drastic volume change and sluggish diffusion kinetics hinder potential commercialized practical applications. Herein, multi-yolk ZnSe/2(CoSe2) heterostructures confined in N-doped carbon (NC) hexahedron have been prepared via a facile two-step method. Benefiting from the novel multi-yolk-shell structure with heterojunction interfaces, ZnSe/2(CoSe2)@NC electrodes display superior sodium storage performance with superior cycling performance (specific capacity of 552.1 mAh g(-1) over 100 cycles at 0.1 A g(-1)) and outstanding rate performance (specific capacity of 528.6 mAh g(-1) at 5 A g(-1)) and long-term cycling stability. Our designed multi-yolk-shell ZnSe/2 (CoSe2)@NC heterostructures can be envisaged to accelerate progress towards advanced alkali metal ion batteries with vast implications for commercialized high-performance energy-storage applications.

Automated summary

A multi-yolk-shell ZnSe/2(CoSe2)@NC heterostructure for sodium ion storage is demonstrated to exhibit superior cycling and rate performance, accelerating the advancement of advanced alkali metal ion batteries.