Interfacial Constructing Flexible V₂O₅@Polypyrrole Core–Shell Nanowire Membrane with Superior Supercapacitive Performance

Abstract

Flexible membrane consisting of ultralong V₂O₅@conducting polypyrrole (V₂O₅@PPy) core-shell nanowires is prepared by a facile in situ interfacial synthesis approach. The V₂O₅ is for the first time demonstrated to show versatile function of reactive template to initiate the uniform and conformal polymerization of PPy nanocoating without the need for extra oxidants. The freestanding PPy-encapsulated V₂O₅ nanowire membrane is of great benefit in achieving strong electrochemical harvest by increasing electrical conductivity, shortening ion/electron transport distance, and enlarging electrode/electrolyte contact area. When evaluated as binder- and additive-free supercapacitor electrodes, the V₂O₅@PPy core-shell hybrid delivers a significantly enhanced specific capacitance of 334 F g^-1 along with superior rate capability and improved cycling stability. The present work would provide a simple yet powerful interfacial strategy for elaborate constructing V₂O₅/conducting polymers toward various energy-storage technologies.