Transitioning from Microballs to Microrods Via Time Interval: Shaping Cobalt Vanadium Oxide for Use in Energy Storage Devices

Developing self-supported electrode material in the absence of electro-inert binders considering the effortless transfer of charges and manipulating physicochemical properties of electrodes in energy storage devices is essential. This investigation focuses on the facile hydrothermal synthesis of a cobalt vanadium oxide (Co<inf>3</inf>V<inf>2</inf>O<inf>8</inf>) microstructure with tailored properties for supercapacitor application. Morphological change from microballs to microrods is detected in prepared Co<inf>3</inf>V<inf>2</inf>O<inf>8</inf> microstructure owing to reaction time variation. The synthesized CVO-AFU-7 h electrode material displays superior supercapacitive performance of 318 F/g at 3 mA/cm2 scan rate. Furthermore, the solid-state hybrid supercapacitor (SSHSc) device revealed superior energy storage capabilities, delivering a high energy density of 3.21 Wh/kg at a power density of 169.69 W/kg. The SSHSc device exhibits long lasting cyclability, retaining 79 % of its initial capacity after 10,000 cycles. Moreover, its practical utility is demonstrated by powering three LEDs simultaneously, indicating strong potential for industrial applications. © 2025 Elsevier B.V.