Facile hydrothermal synthesis and electrochemical investigation of a free-standing cobalt oxide hierarchical nanostructure electrode on a porous carbon structure as an efficient supercapacitor

In the current work, we report the binder-free hydrothermal one-pot synthesis of a cobalt oxide hierarchical nanostructure (Co۳O۴-HNS) onto a highly conductive carbon fiber substrate (CFS/Co۳O۴-HNS) as an efficient electrode for energy storage devices. The fabricated electrode and synthesized Co۳O۴-HNS were structurally characterized using SEM, EDAX, XRD, and FTIR techniques. Electrochemical characterization of the fabricated CFS/Co۳O۴-HNS electrode was also performed and showed that the electrical double-layer capacitance and pseudo-capacitance mechanisms both play roles in the charge storage of the CFS/Co۳O۴-HNS electrode. The obtained results exhibited the electrochemical-specific capacitance of ۷۱۵ F/g at a current density of ۳ A/g for the CFE/Co۳O۴-HNS electrode. The fabricated electrode remains at ۹۶% of its initial capacitance after ۳۰۰۰ cycles, showing the excellent cyclability of the fabricated CFS/Co۳O۴-HNS electrode. These results paved the way for using the proposed facile, one-pot synthesized CFE/Co۳O۴-HNS as an efficient electrode for use in electrochemical energy storage devices.

کلیدواژه ها:

Cobalt oxide hierarchical nanostructure ، binder-free electrode fabrication ، one-pot hydrothermal synthesis ، Supercapacitor