ELECTROCHEMICAL PERFORMANCE FOR MXENE-MOS2 HETEROSTRUCTURE HYBRID ELECTRODE SUPERCAPACITOR IN DIFFERENT AQUEOUS ELECTROLYTES

Abstract

Two-dimensional (2D) materials like molybdenum disulfide (MoS₂) are promising for energy storage due to abundant active sites and short ion diffusion paths. However, MoS₂ nanosheets tend to restack, reducing surface area and electrochemical performance. To overcome this, MoS₂ was integrated with MXene, a conductive 2D material, forming a heterostructure composite. X-ray diffraction (XRD) confirmed the crystallinity, Raman identified the structural properties, while FESEM showed uniform MoS₂ distribution on MXene sheets. Electrochemical performance was evaluated in three different aqeuous electrolytes (6M KOH, 1M H₂SO₄, and 0.5M Na₂SO₄) using cyclic voltammetry and galvanostatic charge-discharge tests. Nickel foam and PVDF were used as the current collector and binder, respectively, contributing to mechanical and electrochemical stability. Specific capacitance og hybrid electrode at scan rate 1mA showcased 6M KOH (80.410 Fg^-1) with highest value followed by, 1M H₂SO₄ (1.901 Fg^-1), and 0.5M Na₂SO₄ (3.847 Fg^-1). These findings underscore MXene’s role in enhancing MoS₂ capacitive properties and emphasize the importance of MXene delamination in optimizing supercapacitor electrode performance, while exploring different electrolytes interaction with the hybrid electrode.