Preparation of NiAl LDH@Mn3O4@Co-MOF ternary composites using MOFs as a framework for high-performance asymmetric supercapacitors

In this work, we have successfully synthesized NiAl LDH@Mn3O4@Co-MOF ternary composites with good properties. Co-MOF sheets are first grown on NF (nickel foam) by the aqueous solvent method. Then Mn(3)O(4 )particles are grown on Co-MOF sheets by electrodeposition. Finally, ultrathin NiAl LDH nanosheet clusters were grown on Co-MOF sheets by hydrothermal method. The three-dimensional Co-MOF can offer a larger specific surface area and more active sites, and the combination of the three substances generates a synergistic effect, resulting in a ternary composite with superior performance, which has superior specific capacity characteristics of 1311 C g(-1) at 1 A g(-1 )and can retain 74.6% of the original capacity after 5000 cycles. The asymmetric supercapacitor assembled with active carbon has a high energy density of 60.91 Wh kg(-1) at a power density of 849.91 W kg(-1) and retains 82.9% of the original performance after 5000 cycles. Therefore, the NiAl LDH@Mn3O4@Co-MOF can be applied as the positive material for supercapacitor, which has good research and application value.

Automated summary

In this study, NiAl LDH@Mn3O4@Co-MOF ternary composites were successfully synthesized, showing superior performance in terms of specific capacity and cycling stability. By optimizing the structure and composition of the materials, the specific capacity and long-term performance of the supercapacitor were significantly improved.