Flexible Array of Microsupercapacitor for Additive Energy Storage Performance Over a Large Area

An on-chip microsupercapacitor (MSC) pattern is obtained by layer-by-layer spray deposition of both manganese dioxide (MnO 2 ) nanoparticle-coated carbon nanotubes (MnO 2 -CNTs) and MnO 2 nanosheet-decorated reduced graphene oxide (MnO 2 -rGO) on mechanically robust, flexible polyethylene terephthalate. Layer-by-layer patterning of MSC electrodes offers rapid in-plane diffusion of electrolyte ions in electrodes the layered electrode and hence ultrahigh capacitance and energy density of 7.43 mF/cm 2 (32300 mF/cm 3 ) and 0.66 μW h/cm 2 (2870 μW h/cm 3 ), respectively, are obtained. A robust electrochemical response was measured under multiple bending of the solid-state flexible MSC as well as under repetitive cycles (∼5000).