All solid-state V 2 O 5 -based flexible hybrid fiber supercapacitors

Abstract Vanadium pentoxide/single-walled carbon nanotube (V 2 O 5 -SWCNT) hybrid fibers with good electrochemical performance and flexibility are firstly prepared by using wet-spinning method. V 2 O 5 nanobelt suspension is obtained by mixing V 2 O 5 bulk, 30% H 2 O 2 , H 2 O and followed by hydrothermally treating at 190 °C for 15 h. SWCNT suspension is suspended into V 2 O 5 nanobelt suspension under vigorous stirring, the V 2 O 5 -SWCNT homogenous suspension is obtained. It is injected into a coagulation bath composed of 5 wt % CaCl 2 ethanol-water solution using syringe pump, V 2 O 5 -SWCNT hybrid fibers are prepared by washing with deionized water and drying at room temperature. Reduced graphene oxide (RGO)-SWCNT hybrid fibers are also prepared by the similar wet-spinning approach and followed by reducing GO-SWCNT hybrid fibers in an aqueous solution of hydriodic acid. All solid-state asymmetric V 2 O 5 /SWCNT//RGO/SWCNT fiber supercapacitors are assembled with V 2 O 5 -SWCNT fiber as positive electrode and RGO-SWCNT fiber as negative electrode by using PVA-H 3 PO 4 as gel electrolyte. The assembled device not only shows maximum volumetric energy density of 1.95 mW h cm −3  at a volumetric power density of 7.5 mW cm −3 , superior rate performance and cycling stability, but also exhibits remarkable flexibility to tolerate long-term and repeated bending. This work will open a new application filed of V 2 O 5 -based fibers in wearable energy storage devices.

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