The University Euromed of Fez (UEMF) has the pleasure to inform the the public of the doctoral thesis defense in ’’ Materials Science and Engineering’’

The thesis defense will take place on Saturday February 24, 2024 at 9:30 at UEMF

Location: the Large Hall of the Incubator (LOC001994) The thesis will be presented by Mr. Mohamed Boundor Under the title:

“ Phosphated ionic liquids and their composite materials for applications in the field of energy ”

Abstract

The growing demand for wearable electronics and electric vehicles has triggered the development of energy storage devices, such as batteries and supercapacitors, toward higher power density and energy density. Moreover, energy storage materials play a key role in efficient, clean, and versatile use of energy, and are crucial for the exploitation of renewable energy. This investigation focuses on synthesizing highly pure phosphate ionic liquids and phosphate viologens through a simple method involving N-quaternization of 1-alkylimidazole or 4,4'-bipyridine with a slight excess of trialkylphosphate. Subsequently, the combination of these building blocks with titanium dioxide by sol- gel chemistry allows for the generation of novel ionic liquid-TiO2 hybrids along with their carbonized materials. The covalent functionalization of TiO2 was carried out using various phosphate ionic liquids or phosphate viologens, resulting in stable P-O-Ti bridges. Subsequent pyrolysis yields porous nanocomposite materials comprising phosphorus-doped TiO2 embedded in nitrogen-doped carbon material (N-C). These nanostructured electrode materials exhibit enhanced electrochemical performance owing to their large specific surface area, improved pathways for electrolyte diffusion, and increased electronic and ionic conductivity. Moreover, phosphate ionic liquids have also been employed in the preparation of LiFePO4/N-C composite cathode, providing a mesocrystalline structure and porous polyhedral particles that enhance accessibility to the electrolyte. The methodology for preparing hybrid phosphate ionic liquids-TiO2 materials demonstrated here can be adapted to other metal oxides, offering promising avenues for improving their conductivity. These advancements hold significant implications for various applications, particularly in the realm of energy storage.

Abstract

The growing demand for portable electronics and electric vehicles is driving the development of energy storage devices, such as batteries and supercapacitors, to increase power and energy density, which depends heavily on advances in the new materials used in these devices. Moreover, energy storage materials play a key role in the efficient, clean and versatile use of energy, and are essential for the exploitation of renewable energies. This study focuses on the synthesis of phosphated ionic liquids and phosphated viologens by N-quaternization of 1-alkylimidazole or 4,4’-bipyridine with a slight excess of trialkylphosphate. Then, the combination of the phosphated ionic liquids with titanium dioxide via the sol-gel process allows access to new ionic liquid-TiO2 and their carbonized version. The covalent functionalization of TiO2 by various phosphated ionic liquids