Constructing Fluorine modified NiCo-LDH nanocomposite for enhanced supercapacitor performance through active site and structural optimization

Layered double hydroxides (LDHs) are promising material for supercapacitors due to its high theoretical capacitance and multiple conductive pathways, however their performance is constrained by its limited active sites. For instance, strategies like incorporating heteroatom and optimizing structural configuration can enhance their capacitance performance. Herein, a novel Spiderweb-like F/NiCoLDH nanocomposites have been synthesized, featuring abundant active sites and tunable morphology that promote rapid charge transfer, and ion diffusion to enhance their electrochemical performance. Furthermore, the incorporation of F increases the conductivity of the LDH which enhances the charge storage mechanism of the F/NiCoLDH nanocomposites. Notably, the F_0.06/NiCoLDH nanocomposite exhibits an outstanding specific capacity of 1988 Fg^-1 at a current density of 1 A g^-1. Furthermore, the assembled hybrid supercapacitor, comprising F_0.06/NiCoLDH as the positive electrode and activated carbon as the negative electrode, achieves remarkably high energy density of 67 Wh kg^-1 at a power density of 746 W kg^-1, coupled with outstanding electrochemical stability, retaining 89 % of its initial capacity after undergoing 10,000 charge-discharge cycles in 1 M KOH electrolyte. This study introduces a pioneering framework for designing heterostructure electrodes material to promote the development of high-performance energy storage devices.