چكيده به لاتين
In this work, metal-organic framework-based composites were designed and synthesized for energy storage and conversion applications. This research was collected in the form of four ISI articles. In the first to fourth paper, CoFe2O4/Ce-UiO-66, NiFe2O4/MOF-808, Ce-on-Zr-MOF-808, and g-C3N4/CeO2/ CoFe2O4 nanocomposites were designed and synthesized, respectively. These nanocomposites are characterized by various methods such as powder X-ray diffraction, infrared spectroscopy, sample vibration magnetometer, thermal gravimetry, porosity, scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, Emission luminescence, and electrochemical impedance spectroscopy. The enhancement of the synergetic effect between metal-organic frameworks and semiconductors or other metal-organic frameworks has led to the improvement of their properties in the intended application. In the first study, CoFe2O4/Ce-UiO66 magnetic nanocomposite was investigated in the photocatalytic oxidation of aliphatic alcohols under aerobic conditions at room temperature and showed better catalytic results compared to its components. In the second study, the NiFe2O4/MOF-808 magnetic nanocomposite was used in response to the photoreduction of hexavalent chromium and the photodegradation of drug contaminants water. Reducing the bandgap leads to improved photocatalytic properties in both hexavalent chromium reduction reactions and degradation of meropenem under visible light. In the third study, following the investigation of chromium reduction, the Ce-on-Zr-MOF-808 structure was synthesized by using the MOF-on-MOF strategy. In this case, the synergetic effect between two metal-organic frameworks causes better charge transfer and improves the recombination of electrons. Finally, in the fourth study, the performance of the g-C3N4/CeO2/CoFe2O4 utilized in the oxygen reduction reaction, and showed better performance compared to the commercial platinum/carbon electrode. Also, oxidized composite g-C3N4/CeO2/CoFe2O4 was used in supercapacitor application and showed a high capacity of about 255.5 F/g.
