Nanocomposites of Ni-Co-Mn MOFs and PANI functionalized CNTs-GNPs with excellent electrochemical performance for energy storage applications

Supercapacitors, pivotal for eco-friendly energy solutions, demand efficient Ni-Co-Mn MOF-based electrodes. These electrodes, combining carbon nanotubes (CNTs), graphene nanoplatelets (GNPs), and polyaniline (PANI), were created through a facile ultrasonication-assisted solvothermal method, fostering their utility in energy storage systems. Scanning electron microscopy (SEM) reveals a distinctive flower-like morphology that facilitates faradic reactions. X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy confirm composition and functional group analysis. Comparative studies demonstrate the superiority of the Ni-Co-Mn/PCG (PANI-CNT-GNP) nanocomposite in charge storage over pristine Ni-Co-Mn MOF. Notably, the Ni-Co-Mn/PCG40 nanocomposite, with 40 mg of PCGs, exhibited outstanding electrochemical performance, boasting the highest specific capacity (1238C/g @ 2 Ag), minimal internal reversibility, and excellent stability. This enhanced performance is attributed to efficient interconnected pathways and the uniform flower-like structure that aids in both electron and ion transportation. The asymmetric supercapacitor assembled from Ni-Co-Mn/PCG-40 showcased exceptional metrics: 380C/g @ 0.7 Ag specific capacity, a maximum energy density of 90 Wh/kg, a maximum power density of 17,000 W/kg, and 100 % stability over 5000 cycles. This research suggests a promising, cost-effective, and environmentally friendly supercapacitor solution for energy storage applications, addressing both pollution mitigation and energy crisis concerns.