Recently, a novel class of emerging 2D materials identified as MXene have been revolutionizing the fabrication and development of flexible energy storage systems, i.e., batteries and supercapacitors. Herein, the focus is on the remarkable capacitive performance of V₂CT _x MXene-based flexible electrodes so far poorly explored. However, research was focused on Ti₃C₂T _x and its applications in the energy field, although more than 100 other members of this group have already been reported. Some of these MXenes are emerging as potential candidates for energy applications with promising results such as Ti₂C and Mo₂C in aqueous electrolytes, but many others remain to be explored. The paper detailed a comprehensive study of the electrophoretic deposition of V₂CT _x on carbon yarn wires and the evaluation of their electrochemical behavior (capacitive and diffusive) in three electrolytes at different pH values: acidic, basic, and neutral pH to investigate the correct potential window for this material in energy applications. The devices exhibited specific capacitances of 248, 177, and 89 F g^{- 1} for EPD10, EPD20, and EPD30, respectively. The synthesized and deposited MXene nanoparticles were analyzed by XRD, Raman, and SEM for phase identification, chemical structure identification, and morphological analysis, respectively. The synthesized material showed good electrochemical performance in terms of cyclic stability after 3000 cycles with >90% capacitance retention.

Emerging technologies, such as portable electronics, have had a huge impact on societal norms, such as access to real time information. To perform these tasks, portable electronic devices need more and more accessories for the processing and dispensation of the data, resulting in higher demand for energy and power. To overcome this problem, a low cost high-performing flexible fiber shaped asymmetric supercapacitor was fabricated, exploiting 3D-spinel manganese oxide Mn₃O₄ as cathode and 2D molybdenum disulfide MoS₂ as anode. These asymmetric supercapacitors with stretched operating voltage window of 1.8 V exhibit high specific capacitance and energy density, good rate capability and cyclic stability after 3000 cycles, with a capacitance retention of more than 80%. This device has also shown an excellent bending stability at different bending conditions.