C@MoO2 hollow yolk-shell structure with excellent Electrochemical Properties as Faradaic Electrode
Transition metal oxide hollow yolk-shell micro/nanostructures combined with conducting substance have gained enormous attention as efficient electrode materials for electrochemical energy storage applications due to their large surface area , internal void space and structural stability. Here, a facile aqueous solution-based soft templet, combined sucrose-CTAB, mediated chemical route for the synthesis of hollow yolk-shell structure of carbon incorporated MoO2 (C@MoO2), with 0.9-1.1 µm diameter, 100 nm wall thickness, inner yolk size of 400-450 nm and BET surface area of 40 m2g-1, is presented. During the synthesis process sucrose plays a dual role, both as templet as well as carbon source. The electrochemical charge storage mechanism follows a battery-type behaviour when tested as a faradaic electrode in 3.0 M KOH electrolyte. C@MoO2 exhibits a high specific capacity of 188 Columb per gram at a current density of 0.5 A g−1 , a good rate performance (50.6 C g-1 at 10 A g-1) and 78 % retention of capacity after 5000 cycles at 5 A g-1. The obtained performance is superior to that of the corresponding pure MoO2 hollow spheres (137.1 C g−1 at 0.5 A g-1) and also, to previously reported MoO2 as well as MoO3 indicating the potential applicability of the presently synthesised yolk-shell C@MoO2.