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Highly stable and interconnected VO2 nanoflowers were uniformly grown on flexible three dimensional graphene networks, which directly served as a lightweight and high conductivity supercapacitor electrode (VO2 NF@3DG). The uniform VO2 NF@3DG hybrid provided direct and stable pathways for rapid electron and ion transport. The hybrid produced an improved areal specific capacitance of 466 mF cm−2 and 283.2 mF cm−2 for the three- and the two-electrode configurations, respectively. A capacitance retention of 63.5% after 3000 cycles showed that the VO2 NF@3DG hybrid had a stable cycling performance at a high specific capacitance. A high energy density of 279.6 mW h m−2 and a high power density of 60 000 mW m−2 were achieved in symmetrical supercapacitors. The effective strategy could be applied to improve the performance of supercapacitors with high efficiency, wide potential windows and long life.

Lightweight, interconnected VO2 nanoflowers hydrothermally grown on 3D graphene networks for wide-voltage-window supercapacitors

Lightweight, interconnected VO₂ nanoflowers hydrothermally grown on 3D graphene networks for wide-voltage-window supercapacitors