Novel NiCoMn MOFs/Ag citrate nanocomposites for high-performance asymmetric supercapacitor applications

•NiCoMn MOFs/Ag Citrate Nanocomposites are synthesized.•XRD and SEM analysis authenticate the presence of anticipated phases, microstructure, and elements.•The material of interest showed a remarkable specific capacitance of 1524 F/g at 0.5 A/g, marking enhancements of 83 % over pure Ag-citrate.•The asymmetric supercapacitor device demonstrated excellent power density of 1500 W/kg, energy density of 61 Wh/kg, and capacitance retention of 101 % under 4000 cycles. Addressing the challenges posed by the global energy crisis, this research article explores the pivotal role of novel NiCoMn MOFs/Ag Citrate Nanocomposites in advancing high-performance asymmetric supercapacitor applications. This study delves into the synthesis of an efficient supercapacitor electrode material using a nanocomposite, denoted as MAx (where x = 1-3), combining NiCoMn metal-organic frameworks (MOFs, represented as M) with Ag-Citrate (notated as A). This synthesis employs an ultrasonication-assisted solvothermal approach. The XRD and SEM analyses authenticate the presence of anticipated phases and elements, revealing a seamless integration of the two components. Electrochemical assessments suggest that introducing Ag-citrate significantly augments the charge storage prowess of the nanocomposites. Specifically, the MA1 nanocomposite showcases a remarkable specific capacity of 762 C/g at 0.5 Ag−1, marking enhancements of 83 % and 10 % compared to pure Ag-citrate and unaltered MOFs, respectively. Furthermore, the asymmetric supercapacitor device based on this nanocomposite delivers optimal metrics: a specific capacity of 291.6 C/g at 2 Ag−1, an energy density of 61 Whkg−1, a power density of 1500 Wkg−1, a Coulombic efficiency of 98.5 %, and an enduring stability of 101 % over 4000 cycles. This exploration accentuates the significant promise of NiCoMn MOFs/Ag-Citrate nanocomposites as efficient, economical, and durable supercapacitors for a spectrum of energy storage needs. [Display omitted]