MXene derived metal organic framework@PANI heterostructure as a hybrid supercapacitor

Metal-organic frameworks (MOFs) are highly valued for supercapacitor applications due to the availability of abundant active sites, highly porous structures, and large surface area. Also, the lower dimension MOF greatly influenced its electrochemical properties. Herein, we have synthesized a new kind of two-dimensional (2D) MOF (V-PMOF) by using tetrakis (4-carboxyphenyl) porphyrin (TCPP) ligand and vanadium-carbide based (V₂CT_x) MXene as a metal precursor via a solvothermal reaction. The availability of highly electronegative atoms and reactive sites in V₂CT_x mainly contributes to the formation of 2D MOF nanosheets. The resulting V-PMOF demonstrated a specific capacitance (Sp. capacitance) of 97 Fg^-1 at a current density (CD) of 0.5 Ag^-1. To further enhance the performance of this MOF, a composite of V-PMOF@PANI, is fabricated by incorporating polyaniline (PANI) nanofibers onto the V-PMOF sheets. The composite V-PMOF@PANI 2 shows a more than 300 % increase in Sp. capacitance (322 Fg^-1) at a CD of 0.5 Ag^-1 along with an excellent cyclic stability by retaining 86 % of its initial capacitance even after 10⁴ cycles at a CD of 5 Ag^-1. These findings indicate that MXene-based MOFs, particularly the V-PMOF@PANI composite, hold significant potential for advancing supercapacitor technology.