Hydrothermal synthesis of ultra-long copper nanowires and their application in the fabrication of supercapacitor electrodes

Ultra-long (about 150 μm) copper nanowires (CuNWs) with high aspect ratio (over 2000) were obtained via hydrothermal method and their application as a supercapacitor electrode was demonstrated. Cyclic voltammetry reveals high areal capacitance (61 mF cm^–2 at 1 mV s^–1) and cyclic stability with capacitance increasing up to 107% after 1000 cycles at 5 mA cm^–2. The proposed approach to the synthesis and fabrication of electrodes based on oxidized CuNWs is promising for the development of supercapacitor components with one-dimensional nanostructures.