Volume 26: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part I

Ni-Co oxide anchored carbon dots for high-performance asymmetric supercapacitor Prerna Sinha, Kamal K. Kar

Abstract

Nickel−cobalt oxide and carbon dots (Ni-Co oxide@C-dots) nanocomposite were prepared by hydrothermal synthesis followed by the pyrolysis technique. The nanocomposite exhibited a flower-like morphology with porous and interconnected monoliths. The nano-dimension carbon dot pockets throughout the composites provide an efficient resistance-free electron transfer pathway. Also, flower-petals type morphology at the surface attracts and enhances electrolyte-electrode interaction. Hence, Ni-Co oxide@C-dots act as a potential anode for a hybrid supercapacitor. As a negative electrode, a high-performance human hair-derived activated carbon is used. In asymmetric assembly, the device delivers a specific capacitance of 295 F g-1 at 1 A g-1. The device also exhibits an excellent energy density of 92 Wh kg-1 at a power density of 1000 W kg-1. The study suggests the synthesis and assembly of a high-performance energy storage device.

Keywords Energy storage system, supercapacitor, charge storage, renewable carbon, waste human hair, Ni-Co oxide@C-dots