▎ 摘　　要

Research on nanocomposites is essential to achieve supercapacitors with enhanced performance for energy storage. In that regards, carbon materials and metal oxides have been employed in conjunction to yield super-capacitors with improved properties. Here we present the fabrication of a layer-by-layer (LbL) film containing manganese dioxide (MnO2) nanostructures embedded into reduced graphene oxide (rGO) sheets and arranged with poly(allylamine-hydrochloride) (PAH) for supercapacitor application. While scanning electron microscopy images confirm the incorporation of MnO2 nanostructures into the rGO layers, cyclic voltammetry and galvanostatic charge-discharge measurements reveal the electrocapacitive features of the films. Nanostructured PAH/rGO-MnO2 LbL films containing 20 bilayers lead to a supercapacitor with high areal capacitance of ca. 112 mF/cm(2) at 1 mV/s and 460 F/g at 1 A/g, in addition to a high capacitive retention performance of 99% over 10,000 cycles and a high charge-discharge time of ca. 600 s. Such properties demonstrate, therefore, the PAH/rGO-MnO2 LbL film a promising architecture to be further explored in energy storage nanostructured systems.