AgCoO₂−Co₃O₄/CMC Cloudy Architecture as High Performance Electrodes for Asymmetric Supercapacitors

Abstract

This work represents the design of superior supercapacitor electrode that comprised of 3D cloud like silver cobalt oxide/ cobalt oxide (AgCoO 2 À Co 3 O 4 ) and carbon architecture. AgCoO 2 À Co 3 O 4 /C architecture can be fabricated from CoÀ Ag nitrate precursors with the addition of carboxymethyl cellulose followed by annealing. Mesoporous 3D cloudy architecture provides higher specific capacitance (575 F g À 1 at a scan rate of 2 mV s À 1 ) and rate performance (666 F g À 1 at a current density of 1 A g À 1 ). The combined effect of AgCoO 2 embedded Co 3 O 4 and carboxymethyl cellulose (carbon) highly favors for outstanding cycle life (around 1 % capacitance degradation even after 5000 cycles). Presence of such porous 3D architecture with carbon backbone delivers admirable energy/power density. Also, an advanced asymmetric supercapacitor with an operating range of 1.2 V is designed by utilizing this porous 3D cloudy architecture as positive electrode and activated carbon as negative electrode. The fabricated design shows a robust energy density of 17 W h kg À 1 with a high power density of 166 W kg À 1 at a current density of 1 A g À 1 . The findings of the current study underline the potential of AgCoO 2 À Co 3 O 4 /C electrodes for supercapacitor applications.[a] I.

Microwave engineered NiZrO3@GNP as efficient electrode material for energy storage applications

“…The slight leftward shift of the semicircle's center suggests that the electrode resistance plays a more significant role compared to the electrolyte resistance. 40 This could be due to factors like the contact resistance between the electrode material and the nickel foam current collector, or possibly due to the intrinsic resistance of NZ itself.…”