Stepwise Construction of MoS₂@CoAl-LDH/NF 3D Core-Shell Nanoarrays with High Hole Mobility for High-Performance...

Supercapacitors (SCs) have received widespread attention as excellent energy storage devices, and the design of multicomponent electrode materials and the construction of ingenious structures are the keys to enhancing the performance of SCs. In this paper, MoS₂ nanorods were used as the carrier structure to induce the anchoring of CoAl-LDH nanosheets and grow on the surface of nickel foam (NF) in situ, thus obtaining a uniformly distributed MoS₂ nanorod@CoAl-LDH nanosheet core-shell nanoarray material (MoS₂@CoAl-LDH/NF). On the one hand, the nanorod-structured MoS₂ as the core provides high conductivity and support, accelerates electron transfer, and avoids agglomeration of CoAl-LDH nanosheets. On the other hand, CoAl-LDH nanosheet arrays have abundant interfacially active sites, which accelerate the electrolyte penetration and enhance the electrochemical activity. The synergistic effect of the two components and the unique core-shell nanostructure give MoS₂@CoAl-LDH/NF a high capacity (14,888.8 mF cm^-2 at 2 mA cm^-2) and long-term cycling performance (104.4% retention after 5000 charge/discharge cycles). The integrated MoS₂@CoAl-LDH/NF//AC device boasts a voltage range spanning from 0 to 1.5 V, achieving a peak energy density of 0.19 mW h cm^-2 at 1.5 mW cm^-2. Impressively, it maintains a capacitance retention rate of 84.6% after enduring 10,000 cycles, demonstrating exceptional durability and stability.