Flower-shaped Ni(OH)2 decorated with biomass-derived carbon TPB-1 for asymmetric supercapacitors

Abstract

Abstract In recent years, notable headway has been made in augmenting supercapacitor functioning through employment of pioneering components, exceptional nanostructures and additional investigation of electrolytes. Nonetheless, achieving superior performance with straightforward techniques remains a significant hurdle. In order to surmount this, an experimental three-dimensional nanospherical pore structure (TPB-20@Ni(OH)2) was designed and prepared. TPB-1 was obtained through carbonisation and activation. TPB-20@Ni(OH)2 nanoparticles were synthesized using TPB-1 as the carbon source and nickel chloride hexahydrate as the nickel source. Furthermore, the TPB-20@Ni(OH)2//AC supercapacitor displayed an impressive energy density of 22.1 Wh kg−1. The TPB-20@Ni(OH)2 composites exhibited a specific capacity of 978 F−1, which is noteworthy. The exceptional output exhibited by the TPB-20@Ni(OH)2 composite derives from its innovative structure, presenting an extensive specific surface area of 237.4 m2 g−1 and porosity of roughly 4.0 nm. Following 20 000 cycles (at a current density of 1 A g−1), asymmetric supercapacitors assembled from TPB-20@Ni(OH)2//AC retained 80.0% of its initial specific electrostatic capacity, indicating superior electrochemical stability and high electrochemical reversibility.