Electrochemical charge storage performance of mesoporous MoO₃@Co₃O₄nanocomposites as electrode materials

Constructing a novel nanocomposite structure based on Co₃O₄is of the current interest to design and develop efficient electrochemical capacitors. The capacitive performance of MoO₃@Co₃O₄nanocomposite is compared with pristine Co₃O₄nanoparticles, both of them being synthesized by hydrothermal technique. A BET surface area of ∼41 m²g^-1(almost twice that of Co₃O₄) and average pore size of 3.6 nm is found to be suitable for promoting Faradaic reactions in the nanocomposite. Electrochemical measurements conducted on both samples predict capacitive behavior with quasi-reversible redox reactions. MoO₃@Co₃O₄nanocomposite is capable of delivering a superior specific capacitance of 1248 F g^-1at 0.5 A g^-1along with notable stability of 92% even after 2000 cycles of charge-discharge and Coulombic efficiency approaching 100% at 10 A g^-1. The outstanding results obtained in this work assure functional adequacy of MoO₃@Co₃O₄nanocomposite in fabricating high-performance electrochemical capacitors.