Vol. 6, Issue 1, Part A (2024)

Graphene oxide was reduced and wrapped around cobalt tin oxide nanoparticles using a simple hydrothermal process. The rGO/CoSnO₃ nanocomposite was analyzed using analytical techniques including TG-DTA, XRD, FT-IR, SEM with EDS, XPS, and UV-DRS. TG-DTA analysis verified the melting point and phase transition at a specific calcination temperature. The phase and crystalline size of graphene oxide (GO), reduced graphene oxide (rGO), cobalt oxide (Co₃O₄), cobalt stannate (CoSnO₃), and rGO/CoSnO₃ are 19.8 nm, 27.6 nm, 26.9 nm, 40.3 nm, and 50.4 nm, respectively. XPS analysis was utilized to investigate the elemental composition and ionic state. The SEM analysis showed that CoSnO₃ agglomerated nanoparticles are evenly spread across the surface of rGO, forming a 2D sheet structure. The band gap of rGO, Co₃O₄, CoSnO₃, and rGO/CoSnO₃ was determined by UV-DRS examination and Kubelka-Munk function diagram analysis, revealing values of 3.5, 2.4, 4.5, 2.7, and 1.6 eV, respectively. We used methylene blue dye for photocatalytic degradation with GO/CoSnO₃ nanocomposite and attained a degradation efficiency of 96.2%. The CoSnO3 and rGO/CoSnO₃ nanocomposites are utilized as electrode materials in three-electrode and symmetric electrochemical supercapacitors. Electrochemical study shows that CoSnO₃ and rGO/CoSnO₃ electrodes have high supercapacitance values of 158.8 F/g and 499.7 F/g at a scan rate of 10 mV/s, respectively. The charge-discharge curves of the rGO/CoSnO₃ electrode indicated a specific capacitance of 603.12 F/g at 1 A/g, which was higher than the specific capacitance of the CoSnO₃ electrode, which was 285.3 F/g at 1 A/g. The rGO/CoSnO₃ electrode has a cyclic performance where it maintains 96.2% capacity retention even after 1000 cycles. This research finding could be valuable for mitigating water contamination and utilized as a supercapacitor material.