Fabrication and evaluation of VNbS@MXene@AC//NF composite electrodes for advanced energy storage and biomedical applications

Increasing demand for high-performance energy storage systems (ESSs) that combine the core components of rechargeable batteries and supercapacitors. This research centres on creating a composite material, vanadium niobium sulfide (VNbS), employing the hydrothermal method and incorporating MXene as a doping material. Analyses including SEM (scanning electron microscopy), XRD (X-Ray diffraction), and EIS (electrochemical impedance spectroscopy) were carried out to explore the composite's morphological, structural, and compositional attributes. Additionally, MXene plays a pivotal role in designing an electrode with VNbS for the supercapattery device. An exceptional specific capacity (Qs = 299.40C/g) is achieved at 1.6 Ag- 1, with high energy (Ed = 35.9 WhKg- 1) and power (Pd = 2121 WKg- 1) densities. In addition, even after 8000 cycles of charging and discharging, the system maintains its coulomb efficiency, which is 92 % and capacity at 83 %. These remarkable findings established a distinct platform for enhancing the efficiency of energy storage devices. In addition, MXene based electrochemical sensor is made for the detection of an imperative brain chemical, dopamine. The electrochemical assessment highlighted the superior sensing abilities of VNbs@MXene, credited to the optimal interaction between MXene and VNbS. Furthermore, this engineered sensor demonstrated commendable consistency in replicability, cyclic behaviour, and storage stability, underscoring the composite's potential in fabricating adaptable electrochemical sensors for highly sensitive and specific DA determinations.