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

Van Thanh Nguyen; Fitri Nur Indah Sari; Jyh-Ming Ting

doi:10.1039/d2ra05679h

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

RSC Adv. 2022 Oct 12;12(45):29170-29176. doi: 10.1039/d2ra05679h. eCollection 2022 Oct 11.

Authors

Van Thanh Nguyen¹, Fitri Nur Indah Sari¹, Jyh-Ming Ting^{1

2}

Affiliations

¹ Department of Materials Science and Engineering, National Cheng Kung University Tainan 70101 Taiwan jting@mail.ncku.edu.tw.
² Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University Tainan 70101 Taiwan.

Abstract

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 K₃[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.