Nano Science and Nano Technology

Biography

Biography: Dr. Awais Ali

Abstract

Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device which bridges the gap between rechargeable batteries and conventional dielectric capacitors. Batteries and supercapacitors are currently the primary choices offering reliable and convenient accessible energy storage. As for energy storage devices, electrochemical supercapacitors provide a higher power density and modest energy density as compared with batteries. Recently, carbon-based nanomaterials, such as activated carbon, carbon nanotubes, carbon nanofibers, and graphene have been studied for supercapacitor electrodes. Among them, activated carbon is still attractive because of its low cost and well-established electrochemical properties. Metal oxides, and their composites have become attractive in various applications for new generation nano-electronic devices including supercapacitors and lithium-ion batteries. Among these, metal sulfides are also known to be electrochemically active materials for supercapacitor applications. ZnMoS₄ nanorods were successfully synthesized on 3D- Ni-foam (NF) by one step hydrothermal process. The ZnMoS₄ nanorods grown on NF delivers good specific capacitance. The hybrid supercapacitor with splendid electrochemical performance is rationally demonstrated by employing ZnMoS₄ and activated carbon as the positive and negative electrode respectively. Hybrid supercapacitor shows good energy density, power density and excellent cycling stability.  These results suggest that the binder free ZnMoS₄ nanorods is a suitable battery type positive electrode for high-performance hybrid supercapacitors.