M.Phil / MS

Now showing 1 - 3 of 3

The Coated Carbonates on Silicon Carbide Materials as an Electrolyte and it's Electrochemical Characterization
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2022) Muddasir Ammar; CIIT/FA20-RPH-040/LHR; Dr. Shahzada Qamar Hussain; LHR TP 7996
In this work we synthesized Silicon Carbide and Coated Carbonate on Silicon Carbide composite as an effective electrolyte material in fuel cell. Fuel cell is considered an efficient device for its clean energy production. To enhance the efficiency of such type of clean energy devices an efficient electrolyte material is required for its proper working. Therefore, in this research work Si- C composite was made by hydrothermal method and Solid-state method. While coated the Sodium Carbonate (Na2CO3) and Potassium Carbonate (K2CO3) on Si-C by dip coating method. To analyze the structural and phase properties of the synthesized samples FTIR has been carried out. Through FTIR spectra various types of stretching and vibrational bonding were studied and find out that there were different kinds of bonding like Si-O-Si, Si-C and C=O present in the prepared samples. UV- Visible spectroscopy was carried out to study the optical bandgap of the prepared samples. Conductivity and electrical bandgap for all composite material was measured by using EIS and the maximum conductivity was found 0.082 Scm-1 at a temperature of 650oC for the sample Si-C (1:1). Furthermore, the three-layer fuel cell was fabricated in which prepared material use as electrolyte and LiNiCuZn as cathode and Anode. The maximum Voc of 0.89 V wi th highest power density of 16.5 (mWCm-2) was recorded by using hydrogen as a fuel.
Multi Doped Ceria based Electrolyte for Low Temperature Solid Oxide Fuel Cell
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) UMAR ALI; CIIT/FA19-RPH-008/LHR; Dr. Muhammad Ashfaq Ahmad; LHR TP 7244
Energy conversion devices are widely being used to convert chemical into electrical. Fuel cell is the most prominent candidate among all the energy conversion devices. The operating temperature of conventional fuel cell is very high because of high electrolyte resistance. Develop better energy storage and conversion devices is the main goal of the scientists and engineers because of increasing global temperature due to consumption of fossil fuels. Fuel cell has potential and capability to give maximum energy without deteriorating environment. Electrolyte is the most important component of fuel cell because oxygen ion conduction only takes place through it. Electrolyte can be made more efficient by doping multi elements in it. In this research work, effects of multi doping in Ceria based electrolytes are discussed for Solid Oxide Fuel Cell. The focus of this project is to synthesize efficient electrolyte material which gives maximum oxygen ions conduction for better performance of fuel cell. Multi transition metals like Ca, Sm, Gd, Ga and Ba is doped with Ce in different composition via sol-gel and co-precipitation method. Four compositions are considered as Ce0.8 Gd0.1 Ba0.05 Ga0.05, Ce0.8 Ca0.1 Ba0.05 Ga0.05, Ce0.8 Sm0.1 Ba0.05 Ga0.05 and Ce0.8 Ca0.03 Gd0.03 Sm0.03 Ba0.05 Ga0.05. Different properties of the synthesized materials like ionic conductivity, crystal structure, optical properties bandgap and other properties have been checked. High ionic conducting is expected by above mentioned compositions. To increase the efficiency of energy conversion and storage devices doping behavior of materials is essential to study. Ceria based electrolytes gives much better performance as compared to conventional electrolyte materials like yttria stabilized zirconia. Ceria based electrolytes work in between intermediate (600-800 oC) to low temperature (400-600 oC). Operating temperature of conventional materials is above 1000 oC due to which efficiency of synthesize material decreases and stability of material also decreases. Crystalline structure of the material is determined by XRD, surface morphology of prepared material is analyzed by SEM, energy band gap can be found by Uv-Vis, vibrational characteristics and phase shift of the synthesized material can be found by Raman spectroscopy, materials used in synthesis can be confirmed by FTIR. In the end conductivity and fuel cell performance is checked. x
The Effect of Li Doping in Titanates as an Electrolyte for Fuel Cells
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) MUHAMMAD KHALID; CIIT/FA18-RPH-014/LHR; Dr. Muhammad Ashfaq Ahmad; LHR TP 6082
This dissertation is dedicated to study of The Effect of Li Doping in Titanates as an Electrolyte for Fuel Cells. Fuel cell is one of the energy devices and use to provide clean energy in efficient way. Therefore, in this project our aim is to enhance the ionic conductivity using lithium as dopant into its titanium sites to improve ionic conductivity at lower temperature. In this research work, proposed novel electrolyte will be strontium titanate (SrTiO3) and ―lithium doped Strontium titanates‖ electrolyte material for fuel cell will be prepared via co-precipitation and sol-gel routes. The effect of Li doping in titanates will be studied to avoid the current leakage issues which ultimately enhance the performance of the fuel cell. Different properties like crystal structure, ionic behavior and conductivity will be studied. High ionic conductivity and better density is expected as an outcome of this study. To enhance the efficiency of such devices and the electronic behavior the doping of the materials need to be studied. Therefore, in this research work titanate based and doped material as SrTiO3 are developed for the fuel cell by Co-precipitation and Sol-gel methods and then fuel cell performance of the prepared materials are studied. The structural properties of Li doped prepared material is to be studied as SrTiO3. Tetragonal structure is achieved from SrTiO3 and cubic structure is achieved at LiO2 that is analyzed by X-Ray diffraction (XRD). Surface morphology of prepared material is studied by scanning electron microscopy (SEM) have homogeneous and porous structure. The material shows relatively low electronic and ionic conductivity in the wide range of temperature. That material eventually increases its ionic conductivity to promote its proton conduction. SrTiO3 is perovskite oxide that shows excellent chemical and structural stability for low temperature SOFCs.

M.Phil / MS

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