Oxygen Nucleation of MoS Nanosheet Thin Film Supercapacitor Electrodes for Enhanced Electrochemical Energy Storage.

A direct thin film approach to fabricate large-surface MoS nanosheet thin film supercapacitors using the solution-based diffusion of thiourea into an anodized MoO thin film was investigated. A dense MoS nanosheet thin film electrode (D-MoS ) was obtained when the anodized MoO thin film was processed in a low thiourea solution concentration, whereas a highly porous MoS nanosheet thin film electrode (P-MoS ) was formed at a higher thiourea solution concentration. The charge storage performances of the D-MoS and P-MoS thin films displayed an unusual increase in capacitance on extended cycling, leading to a capacitance as high as around 5-8 mF cm .