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Hierarchical Co3O4@CoWO4/rGO core/shell nanoneedles arrays are successfully grown on 3D nickel foam using a simple, effective method. By virtue of its unique structure, Co3O4@CoWO4/rGO demonstrates an enhanced specific capacitance of 386Fg−1 at 0.5Ag−1 current density. It can be used as an integrated, additive-free electrode for supercapacitors that boasts excellent performance. As illustration, we...
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