Study On Synthesis And Electrochemical Performance Of Ti₃C₂ And Ti₃C₂ Composite Materials

With the rapid development of the global economy,due to the depletion of fossil fuels,and increasing environmental pollution,there is an urgent need for efficient,clean,and sustainable sources of energy,as well as new technologies associated with energy conversion and storage.Supercapacitors are devices capable of managing high power rates compared with batteries.Electrochemical capacitors（ECs）,also called ultracapacitors or electric double layer capacitors,have attracted a tremendous amount of attention as energy storage devices due to their high power density,fast charge-discharge ability,excellent reversibility,and long cycling life.Due to these advantages,supercapacitors make up many markets ranging from electronics to transportation and stationary applications.In this article,Ti₃C₂and Ti₃C₂ composite materials were used in supercapacitor.MXene-based materials are promising electrode materials for supercapacitor（ECs） due to their unique two-dimensional layered structure,high surface area,remarkable chemical stability and electrical conductivity.Two-dimensional（2D）carbide Ti₃C₂ was synthesized by exfoliating Ti₃AlC₂ in HF solution and used for supercapacitive performance investigation in three electrode system.The Ti₃C₂ was characterized by X-ray diffraction,scanning electron microscopy and X-ray photoelectron spectroscopy.The specific surface area（SSA）of as-synthesized Ti₃C₂is 11.70 m²/g.Ti₃C₂-based supercapacitor electrodes exhibit good energy storage ability and has a capacitance 110.3 F/g at the current density of 0.5 A/g in 1 mol/L NaClO?electrolyte.MoS₂ nanoparticles decorated Ti₃C₂ MXene was synthesized through a hydrothermal reaction process and subsequently fabricated as an electrode for ECs.The as-prepared Ti₃C₂,MoS₂,and Ti₃C₂-MoS₂ were characterized by X-ray diffraction and scanning electron microscopy.The results indicate that MoS₂ nanoparticles with a diameter of less than 200 nm were decorated onto the Ti₃C₂ MXene nanosheets.The resulting composites exhibit significantly higher specific capacitance of 150.4 F/g at 1 A/g,which was 2.4 times that of pure Ti₃C₂（62.2 F/g）. Fe₃O₄ nanoparticles decorated Ti₃C₂ MXene was synthesized through a co precipitation process and subsequently fabricated as an electrode for ECs.The as-prepared Ti₃C₂,Fe₃O₄,and Ti₃C₂-Fe₃O₄ were characterized by X-ray diffraction,scanning electron microscopy and X-ray photoelectron spectroscopy.The results indicate that Fe₃O₄nanoparticles with a diameter of less than 40 nm were decorated onto the Ti₃C₂ MXene nanosheets.The resulting Ti₃C₂,Fe₃O₄,and Ti₃C₂-Fe₃O₄ exhibit capacitance as follow:85.3F/g,256.2 F/g and 456.4 F/g at 1 A/g in 1 mol/L KOH electrolyte.These results suggest that Ti₃C₂,Ti₃C₂-MoS₂,and Ti₃C₂-Fe₃O₄ have the potential as the electrode material for high-performance energy storage devices.