In situ grown core/shell heterostructure of CuCo2O4/NiCo-LDH composite intercalated by glucose on Ni networks for all-solid-state hybrid supercapacitor electrodes

Abstract

Hybrid supercapacitors (HSCs) have attracted widespread attention due to their unique combination of high power density and high energy density. Thus, they offer a practical and cost-effective solution for energy storage and power delivery, contributing to the development of a promising technology for various applications. However, the electrochemical performance largely relies on the selection of electrode materials. Here, we suggest composite electrodes of glucose-intercalated CuCo2O4/NiCo-G-layered double hydroxide (LDH) formed with core/shell heterostructures on Ni foam for high-performance HSCs. The strong synergistic effects of the CuCo2O4 core and glucose-intercalated NiCo-G-LDH shell with unique morphology enhance the excellent electrochemical properties by forming a synergistic effect that overcomes the drawbacks of individual materials. The specific capacity of the core/shell structure as a supercapacitor electrode at 1 A g−1 is 378 mAh g−1 and ∼113% is retained after 5000 cycles. In addition, by the integration of the glucose-intercalated CuCo2O4/NiCo-G-LDH with activated carbon, the configured HSC device presents an energy density of ∼37.2 Wh kg−1 at a power density of ∼775.5 W kg−1. Our work offers a robust strategy to create a core/shell composite with excellent stability and durability, making it suitable for use in high-performance energy storage devices.