HCN@CoS composite electrodes for supercapacitors: microwave-assisted hydrothermal synthesis

Abstract

The development of efficient, clean and high-performance energy storage devices is urgently needed due to the ever-increasing demand for energy to power products, global warming issues and the depletion of fossil fuels. Transition metal sulfide electrodes play important role in determining electrochemical properties, making them highly promising candidates for supercapacitor applications. The supercapacitor is an effective energy storage and conversion device. It is a sustainable charge storage device that bridges the gap between batteries and conventional capacitors. In this study, CoS material was coated on hollow carbon nanorods (HCNs) with a unique nanorod shapes. Metal sulfide coating on carbon was achieved by microwave-assisted hydrothermal synthesis in 20 min. The resulting samples was characterized by FESEM and EDX. HCN@CoS exihibited a capacitance of 0.45 F cm-2 at a current density of 1 mA cm2 . This microwave-assisted synthesis of HCN@CoS electrode provides a promising way to prepare electrodes and expands the utilization of transition metal materials in high-performance energy storage applications.