مائده اقائي مكرم

In this project, Cu2CoSnS4 (CCTS) quaternary chalcogenide nanoparticles were synthesized by facile, rapid and one-pot autocombustion assisted microwave method with a irradiation power of 900 W for 20 minutes in solid state. Thiourea was used as sulfur source and driving agent for running the combustion reaction to form CCTS nanoparticles.The structure, morphology and optical properties of the prepared product were characterized using X-ray diffraction analysis (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS) and UV-Vis Diffuse Reflectance Spectroscopy (UV-DRS) methods. As a result, the synthesis of pure phase of CCTS with a particulate morphology with a average particle size of 40 nm was confirmed. In addition, the layered g-C3N4 nanoparticles was also prepared by autocombustion assisted microwave procedure with a power of 900 W for 10 and 20 min using thiourea as a carbon and nitrogen rich source. The combustion reactions were operated in a reaction set-up manufactured from an alumina crucible encircled by a jacket of CuO as microwave absorbing layer. This work-piece supplies calcination conditions without any external heat source to prepare a pure phase of g-C3N4 nanoparticles. The features study revealed a pure phase preparation of layered structure of g-C3N4 nanoparticles with the average size of 27 nm after running the autocombustion assisted microwave reaction for 20 min. At the next step of project, the synthesis of CCTS/g-C3N4 nanocomposite by the same synthesis reaction was aimed. The structural and morphological studies revealed the successful synthesis of this composite in nanoscale.The pseudocapacitive behavior was eva‎luated through a series of electrochemical tests, including cyclic voltammetry (CV) at different scan rates. The results indicated an increased specific capacitance (150 F/g) for the prepared CCTS/g-C3N4 film compared to the CCTS nanoparticles (98 F/g) at a potential scan rate of 0.01 V s . 1-Further CV tests (200 cycles) showed a capacity retention of 90%, revealing a rather good recyclability and long cycle life. The band-gap energy of the products were also studied in detail. The results showed that the products can be introduced as an electrode material in electrochemical applications.

كالكوژنيد چهارتايي , تابش ريزموج , نانوكامپوزيت , خواص الكتروشيمي

Quaternary Chalcogenide , Microwave irradiation , nanocomposite , electrochemical properties

Maede Aghaei

Dr. Tajarodi