3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

Room-temperature synthesized 3D hierarchical cobalt vanadate (Co3V2O8) nanosheet arrays on Ni foam for use as supercapacitor electrode is presented. In a 3 M KOH electrolyte, the electrode exhibits a capacitance of 109.9 mA h g(-1) (878.9 F g(-1)) at a current density of 1 A g(-1). The capacitance is enhanced to 198.1 mA h g(-1) (1584.5 F g(-1)) at 1 A g(-1) through the addition of 0.05 M redox-additive K-3[Fe(CN)(6)] into the KOH electrolyte. Furthermore, the Co3V2O8/activated carbon asymmetric supercapacitor cell with the advanced electrolyte outperforms most reported Co3V2O8-based electrodes with a remarkable energy density of 55.5 W h kg(-1) at an 800 W kg(-1) power density. Combining a facile synthetic strategy and excellent electrochemical performance, the obtained Co3V2O8 exhibits potential for practical application.

Automated summary

This article presents the use of room-temperature synthesized 3D hierarchical cobalt vanadate nanosheet arrays as supercapacitor electrodes. By adding a redox additive, the electrode's capacitance is significantly enhanced, and the obtained cobalt vanadate shows potential for practical application.