Doctoral thesis defense in Materials Science and Engineering by Mr. Mohamed Boundor
CEDOC
The Euromed of Fez (UEMF) is pleased to inform 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 a.m. at the UEMF
Location: the Great Hall of the Incubator (LOC001994) The thesis will be presented by Mr. Mohamed Boundor Under the theme:
“ Phosphated ionic liquids and their composite materials for energy applications ”
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-TiO 2 hybrids along with their carbonized materials. The covalent functionalization of TiO 2 was carried out using various phosphate ionic liquids or phosphate viologens, resulting in stable PO-Ti bridges. Subsequent pyrolysis yields porous nanocomposite materials comprising phosphorus-doped TiO 2 embedded in nitrogen-doped carbon material (NC). 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 LiFePO 4 /NC composite cathode, providing a mesocrystalline structure and porous polyhedral particles that enhance accessibility to the electrolyte. The methodology for preparing hybrid phosphate ionic liquids-TiO 2 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.
Summary
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 is highly dependent on progress made in new materials used in these devices. Additionally, energy storage materials play a key role in the efficient, clean and versatile use of energy, and are essential for harnessing renewable energy. This study focuses on the synthesis of phosphate ionic liquids and phosphate viologens by the N-quaternization of 1-alkylimidazole or 4,4'-bipyridine with a slight excess of trialkylphosphate. Then, the association of phosphated ionic liquids with titanium dioxide via the sol-gel process provides access to new hybrids of the ionic liquid-TiO 2 and their carbonaceous version. Covalent functionalization of TiO 2 by different phosphated ionic liquids
or phosphate viologens was carried out, creating stable PO-Ti bonds between the organic and inorganic phase which were confirmed by different characterization techniques. Then, the pyrolysis of TiO 2 resulted in the formation of porous phosphorus- doped 2 wrapped in nitrogen-doped carbon (NC) material. These as-prepared nanostructured electrode materials showed better electrochemical performance due to their large specific surface area and improved electrolyte diffusion pathways and electronic and ionic conductivity. Phosphated ionic liquids were also used for the preparation of the LiFePO 4 /NC composite cathode, providing a mesocrystalline structure and porous polyhedral particles that improve accessibility to the electrolyte. This strategy for preparing phosphated ionic liquid-TiO 2 can be easily transformed into other metal oxides, thus offering promising prospects for improving the conduction properties of these metal oxides. These advances have significant implications in various application areas, including energy storage.
This thesis will be presented to the jury members. :
|
First and last |
Establishment |
Quality |
|
Pr. Tijani BOUNAHMIDI |
Euromed University of Fez, Morocco |
President |
|
Prof. Khalid DRAOUI |
Abdelmalek University , Tetouan, Morocco |
Rapporteur |
|
Prof. Mohamed LAHCINI |
Cadi Ayyad University, Marrakech, Morocco |
Rapporteur |
|
Prof. Hicham BEN YOUCEF |
Mohammed VI University Polytechnic, Benguerir, Morocco |
Rapporteur |
|
Prof. Hicham ZAITAN |
Sidi Mohamed Ben University Abdellah Fez, Morocco |
Examiner |
|
Prof. Nadia KATIR |
Euromed University of Fez, Morocco |
Thesis Director |
