▎ 摘　　要

In this work, a micro-supercapacitor device with enhanced energy storage ability was fabricated by combining an electric double-layer supercapacitor and a pseudo-supercapacitor. To fabricate the micro-supercapacitor device, a nickel (Ni)/multi-layer graphene/manganese dioxide (MnO2) hybrid thin film was designed. The structure of the as-fabricated thin film is characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Raman spectroscopy. The electrochemical performance evaluation of the as-fabricated thin film electrode, after introducing MnO2 as a pseudo-supercapacitor material, produced a specify capacitance of 12 Fm-2, 30 times higher than electrodes fabricated only by the film without MnO2. In addition, the as-fabricated micro-supercapacitor device has a wider working voltage range of 1.3 V due to the combination of electric double-layer supercapacitor and the pseudo-supercapacitor. The increasing of working voltage range could further increase the energy density as well as the overall performance.