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In this work, we synthesized the hierarchical core/shell hybrid electrode composed of well-aligned Co3O4 nanowire arrays on three-dimensional nickel foam with ultrathin PPy nanoflakes wrapped each nanowire. Supercapacitor based on this unique Co3O4@PPy core/shell nanowire arrays exhibits the specific capacitance as high as 2017Fg−1 (areal capacitance of 4.90Fcm−2) at a current density of 1mAcm−2....
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