Improved electrochemical behavior of Co3O4@graphtic carbon nitride nanosheets for supercapacitor applications

Abstract

Scientists have directed their efforts towards advancing energy storage devices to address the growing energy problem resulting from the depletion of non-renewable resources. Supercapacitor, are innovative energy conversion and storage devices got attraction because of their longer lifetime and specific power. This study presents the hydrothermal route to fabricate Co3O4, g-CN and Co3O4@g-CN nanohybrid. Different characterization methods evaluated the morphological, electrochemical and structural characteristics of fabricated material. The 3-electrode configuration was used to investigate electrochemical characteristics, specifically in KOH with a 2.0 M solution. The galvanostatic charge/discharge plots of Co3O4@g-CN nanohybrid had Cs value of 764 F/g, which was higher than individual Co3O4, g-CN 562, 238 F/g respectively. The analysis of electrochemical stability demonstrates that Co3O4@g-CN material demonstrates structural stability after the 5000th charge/discharge cycles with (95%) retention. The Nyquist plot was utilized to find charge transfer resistance of the Co3O4@g-CN nanohybrid resulting in a value of 0.4 Ω. This value was found to be lower than the charge transfer resistances of both Co3O4 and g-CN. The Co3O4@g-CN electrode material exhibits improved electrochemical characteristic making it a viable candidate for incorporation into supercapacitor. Moreover, their material stability suggests their potential to be used in future generation energy storage equipment.