Amorphous V-doped Co3S4 yolk-shell hollow spheres derived from metal-organic framework for high-performance asymmetric supercapacitors

Metal-organic frameworks (MOFs) have appeared as a new option for constructing various functional materials for energy storage applications. In this work, a novel amorphous vanadium doped Co3S4 (V-CS) hollow sphere is synthesized through a facile method. Due to the unique structure, the amorphous V doped Co3S4 provides large amount of active sites for better storage energy. A remarkable specific capacitance of 1725 F g-1 at the current density of 0.3 A g-1 was achieved for this electrode. Further, the as-fabricated asymmetric supercapacitor device contains the V-CS electrode and activated carbon electrode (positive and negative, respectively) lead to outstanding performance with maximum energy and power densities of 88.29 Wh kg-1 and 486 W kg-1, respectively, that is better than traditional supercapacitors. In addition, the fabrication process illustrated in this article is facile, controllable, and economical, offering a viable method for fabricating the next generation of high-performance energy storage devices. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

A novel amorphous vanadium doped Co3S4 hollow sphere with unique structure was successfully synthesized using a simple method, providing large amount of active sites for better energy storage performance. The asymmetric supercapacitor device fabricated with the V-CS electrode and activated carbon electrode exhibited outstanding energy and power densities, surpassing traditional supercapacitors. The fabrication process presented in this article is simple, controllable, and economical, offering a viable method for fabricating high-performance energy storage devices in the future.