عرفان كمالي

In this research, the cobalt sulfide (Co3S4)/MXene (Ti3C2) composite was synthesized using the in-situ hydrothermal method, and its electrochemical performance as an electrode material for supercapacitors was investigated. To fabricate the cobalt sulfide (Co3S4)/MXene (Ti3C2) composite, thiourea, ammonium hydroxide, cobalt chloride, and MXene powder were used as precursors. The hydrothermal method is a simple, adaptable, and cost-effective process in terms of time and energy. The synthesized powders were characterized using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) along with EDS analysis and Mapping, and Brunauer-Emmett-Teller (BET) surface area analysis. The results of these analyses showed the formation of various cobalt sulfide and MXene composites with different morphologies by changing the MXene content. The electrochemical performance of the synthesized powders was eva‎luated using Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD) and Electrochemical Impedance Spectroscopy (EIS) tests. The CV results showed the presence of redox peaks, indicating the energy storage capability of the material in all the samples. After investigating the resulting microstructures, the electrochemical properties of the fabricated powders were eva‎luated. An increase in the capacity from the EMC 20% sample to the EMC 25% sample and then a decrease in the capacity from EMC 25% to EMC 35% were observed. The EMC 25% composite had the highest specific surface area (39.09 m²/g), while the EMC 35% composite had the lowest specific surface area (14.35 m²/g). According to the GCD test results, the best specific capacitance at a current density of 1 A/g was measured as 3550 F/g for the EMC 25% composite sample. Based on the CV test results, the best specific capacitance at a scan rate of 1 mV/s was also obtained for the EMC 25% composite sample, which was 1862.58 F/g. The electrochemical impedance parameters, including the solution resistance (Rs), charge transfer resistance (Rct) and Warburg coefficient (Wo), were measured as 5.88 Ω, 3.41 Ω and 2.27 Ω, respectively, for the best sample in terms of specific capacitance, indicating good conductivity of the fabricated material.

ابرخازن , نانو ذرات , كامپوزيت سولفيد كبالت (Co3S4)/ مكسن (Ti3C2) , سنتز هيدرو-سالووترمال درجا , خواص الكتروشيميايي

Supercapacitor , Nanoparticles , Cobalt Sulfide (Co3S4)/MXene (Ti3C2) Composite , In-Situ Hydro-Solvothermal Synthesis , Electrochemical Properties

Erfan Kamali

Masoud Hashemi Niasari