2D/2D SnS2/Ti3C2 MXene composites for their supercapacitor and biosensor studies

This study presents SnS₂/Ti₃C₂ (ST) hydrothermal synthesis through a facile and efficient technique. The synthesized materials were thoroughly characterized using XRD, FESEM, HRTEM, EDX mapping, SAED, BET, and TGA. The electrochemical performance was assessed using a Nickel mesh electrode through cyclic voltammetry (CV), differential pulse voltammetry (DPV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD) tests in 1M KCl. The GCD studies revealed an impressive specific capacitance of 206.32F/g, with a power density of 348.18W/kg and an energy density of 103.16Wh/kg. Notably, the material demonstrated exceptional cycling stability, maintaining 80 % retention after 20,000 cycles and exhibiting a Coulombic efficiency of 94 %, outperforming both SnS₂ and MXene. The sensor displayed excellent sensitivity for dopamine and tyrosine detection, with linear ranges of 0–150μM and a limit of detection (LOD) of 6.98μM and 16.82μM for dopamine and tyrosine in CV, respectively, and 26.22μM and 119.01μM in DPV. Selectivity, reproducibility, and resistance to interference were also thoroughly evaluated, indicating outstanding sensor stability. Real-world applicability was demonstrated through successfully detecting dopamine and tyrosine in human blood and serum samples, demonstrating the material's suitability for biological sensing applications.