Ti ₃ C ₂ T _x -Supported NiFeP Composite as an Efficient Electrode Material for Supercapacitor Application

The rapid use of fossil fuels has shortened energy reserves and amplified environmental pollution. Nonetheless, rapidly developing supercapacitors are becoming popular as advanced energy storage solutions owing to their fast charge–discharge, higher power output, and extended cycling. Their accomplishment hangs on features of the material for electrodes, namely stability, conductivity, and surface area. Among various electrode materials, 2D MXene-based composites stand out as effective owing to their layered structure, surface chemistry, and electrochemical properties. The present work focuses on improving energy storage capacity by using bare MXene and synthesizing composite electrodes of Ni-Fe phosphide/MXene (NiFeP/Ti 3 C 2 T x ). The fabrication of the composite electrode materials was performed via a hydrothermal process, followed by phosphorization. The optimized NiFeP/Ti 3 C 2 T x -3 electrode demonstrated enhanced energy storage performance in a three-electrode setup, achieving a specific capacitance ( C s ) of 1168.79 F g −1 at 0.25 A g −1 and 708.81 F g −1 at 1 A g −1, demonstrating good rate capability and practical relevance. Moreover, the enhanced charge-storage efficiency was achieved through collective interactions between NiFeP and Ti 3 C 2 T x . Additionally, an asymmetric supercapacitor (ASC) made from NiFeP/Ti 3 C 2 T x and activated carbon (AC) exhibited a moderate energy density (ED) of 9.28 W h kg −1 and a power density (PD) of 399.99 W kg −1 with a capacitance retention of 83.12% after 10,000 cycles, emphasizing its effectiveness as an effective electrode material for advanced supercapacitor applications.