Cuco2o4@Nico Layered Double Hydroxide Heterostructured Nanocomposite for High Specific Capacity Supercapacitors Application

Abstract

Bimetallic oxide CuCo2O4 (CCO) attracted much attention in the application of supercapacitors because of its high conductivity and outstanding electrochemical activity. Structural optimization is crucial for increasing the active sites and accelerating the surface chemical reactions to enhance the capacity and longevity. In this study, CuCo2O4@NiCo layered double hydroxide (LDH) heterostructure (CCO@NC-LDH) is in-situ grown on nickel foam via a hydrothermal assisted electrodeposition strategy. CCO@NC-LDH provides a large specific surface area, copious redox reaction sites, as well as the effective interface charge mobility through tight connections between the interface. These properties address the inherent limitations of traditional electrodes, leading to the superior specific capacitance and excellent cycle life. Due to the high utilization of abundant electroactive sites, the optimized CCO@NC-LDH electrode achieves an ultra-high specific capacitance of 4824.3 F·g-1 at 1 A·g-1, significantly outperforming standalone CCO and NiCo-LDH electrodes. The asymmetric supercapacitor based CCO@NC-LDH exhibits a remarkable energy density of 65.6 Wh·kg-1 at a power density of 750.0 W·kg-1 and a stable long cycle life. Furthermore, the fabricated supercapacitor successfully powers LED lights continuously, showcasing its practical application potential. These excellent performances highlight the immense promise of this heterostructured nanomaterial in advanced energy storage applications.

Keywords: Heterojunction, CuCo2O4@NiCo layered double hydroxide, Asymmetric supercapacitor, Energy density