High Entropy Metal Organic Framework Incorporated 2D Ti₃C₂T_X MXene for Supercapacitor Application

High-entropy metal-organic frameworks (MOFs) are a new class of supercapacitive materials. The random distribution of multiple metal cations in these HEMOFs results in coordination defects and lattice distortion, exposing a diverse redox-active metal centers that allow for effective faradic charge storage and structural stability in the supercapacitor electrode. Coupling with 2D MXenes, which provide high conductivity, surface terminations, and fast ion channels, synergistically enhances electron/ion transport and pseudocapacitive energy storage. The present study proposes solvothermal synthesis of HEMOF/MXene nanosheets utilizing terephthalic acid in order to produce high-performance supercapacitors. This technique efficiently prevents MXene nanosheets from restacking by maintaining a uniform distribution of HEMOF on their surfaces. At a current density of 1 A/g, the HEMOF/MXene (1:1) composite has a specific capacitance of 642.5 F/g, which is higher than that of other composites. With a coulombic efficiency of 100% and a retention of 90%, the HEMOF/MX (1:1) also exhibits remarkable capacitance retention up to 5000 galvanostatic charge-discharge (GCD) cycles. The asymmetric device has good cyclic stability and an energy density of 5.424 Wh/kg at a power density of 2398 W/kg at a current density of 1 A/g. These findings emphasis the HEMOF/MXene composite material's outstanding potential as a frontrunner for future energy devices.