Evolution of Cuo Bundles of Nanowires by Room Temperature Surface Oxidation of Electroplated Cu for High-Performing Energy Storage Device

Abstract

In the present work, copper oxide bundles of nanowires (CuO BNWs) were synthesized by room-temperature surface oxidation of electroplated Cu layer in alkaline bath. The time dependent morphological evolution of CuO BNWs is systematically achieved by varying surface oxidation time. The CuO BNWs provides a high surface area and have shown excellent supercapacitive performance with specific capacitance of 509 F/g at 1 A/g current density owing to fast electron transfer paths offered by BNWs. The all-solid-state hybrid supercapacitor device (CuO BNWs//PVA-KOH//rGO) demonstrates a specific capacitance of 77.3 F/g and energy density of 22.57 Wh/kg at power density of 1.29 kW/kg.

Keywords: Thin films, Energy storage and conversion, CuO, Surface oxidation, Supercapacitor