The fabrication of Co3S4/NF@NiCo-LDH nanocomposites for integrated all- solid-state asymmetric supercapacitors

In the study, Co3S4/NF@NiCo-LDH nanocomposites were successfully synthesized on nickel foam (NF) by a simple and cost-effective hydrothermal method. The supercapacitors with Co3S4/NF@NiCo-LDH as electrode materials exhibited an ultra-high specific capacitance of 3480.0F g-1 at a current density of 1 A/g. Co3S4/ NF@NiCo-LDH//activated carbon (AC) all-solid-state asymmetric supercapacitor (ASS) was assembled with PVA/KOH as the electrolyte. The ASS device exhibits excellent cycling stability of 77.97 % capacitance reten-tion after 5000 cycles at 10 A/g. The maxmum energy density of Co3S4/NF@NiCo-LDH//AC ASS was 275.2 Wh kg-1, with the power density of 5760 W kg-1. Especially, the ASS devices connected in different manners pre-sented the typical performances of integrated circuits: voltage enhancement for series devices and current enhancement for parallel devices. Therefore, the study presented great practical potentials for new energy stor-age devices in integrated circuits.

Automated summary

Co3S4/NF@NiCo-LDH nanocomposites were synthesized on nickel foam (NF) by a hydrothermal method. The supercapacitors with Co3S4/NF@NiCo-LDH exhibited high specific capacitance, good cycling stability, and promising energy and power density. The all-solid-state asymmetric supercapacitors showed typical integrated circuit performance and potential application in new energy storage devices.