Browsing by Author "CIIT/SP23-RPH-008/LHR"

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    Catalytic study of Cobalt-Free Cathode Materials for Ceramic Fuel Cells
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Nadia Sana Saboor; CIIT/SP23-RPH-008/LHR; Dr. Ghazanfar Abbas; LHR TP 9629
    The great efficiency and fuel adaptability of ceramic fuel cells (CFCs) make them a promising route towards sustainable energy conversion. However, cobalt, a vital component of conventional cathodes, is expensive and scarce, which prevents the widespread use of CFCs. The catalytic investigation of cobaltfree cathode materials, namely SrFeMoW, for enhanced CFC performance is the main topic of this research. Our main objective is to improve the performance and temperature tolerance of the SOFC. We wish to address a few problems that cause it to operate slowly and less effectively. The present study will employ specialized manufacturing processes, including screen printing and tape casting, to regulate the component thickness of the SOFC. This will enhance the SOFC's performance and help it conduct electricity more effectively. I will make a Cobalt-free composite cathode which is cost-effective and which will operate at lower temperatures. This cobalt-free cathode will be prepared with the help of the sol-gel method. Using a variety of experimental methods, such as X-ray diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), UV-Vis spectroscopy, electrochemical impedance spectroscopy (EIS), and fuel cell testing, the study examines the structural, electrochemical, and catalytic characteristics of SrFeMoW. These methods shed light on the material's electrical characteristics, phase purity, chemical bonding, crystal structure, and electrochemical behavior. The impact of several doping techniques and synthesis parameters (such as temperature and environment) on the material's microstructure, oxygen reduction reaction (ORR) activity, and overall cell performance is methodically assessed. Using a multi-technique characterization approach, gain a thorough grasp of the structure-property interactions in SrFeMoW cathodes. Improve SrFeMoW stability and catalytic activity by optimizing its production and processing. Examine how doping with different elements (such as transition metals and rare-earth metals) affects the ORR kinetics and long-term durability. Compare the performance of SrFeMoW-based cathodes with that of traditional cobalt-based cathodes in single cells.
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    Transition Metal Doped SDC Semi-Ionic Electrolyte Materials at Low Temperature for Solid Ceramic Fuel Cell
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Saba Saboor; CIIT/SP23-RPH-008/LHR; Dr. Ghazanfar Abbas; LHR TP 9630
    Renewable energy sources are becoming more and more important in today's society. They will be crucial shortly if climate change is to be prevented. This industry has seen a surge in interest in fuel cells due to its high conversion efficiency in comparison to conventional techniques for energy conversion. Fuel flexibility, minimal pollution and hazardous emissions, and affordable components make SOFCs a valuable source of energy conversion technology. There are still certain problems that need to be fixed, like the fact that at low- temperature conductivity and efficiency decreased. Electrolyte Transition metals (AgNO3, Na2WO4, Y(NO3)3, MoO3) doped SDC materials with enhanced properties, like chemical stability, durability, thermal coefficient compatibility, and conduction mechanism enhancement, are developed in this study using the co-precipitation method. These properties have a direct impact on the material's conductivity and electrochemical performance. Using Raman spectroscopy, a range of investigations, including rotational and vibration modes and structural features, are performed on the synthesized materials. Utilizing UV-visible analysis, the band gap energy (Eg) is determined. Electrochemical Impedance Spectroscopy (EIS) is utilized to analyze ohmic and polarization losses at varying temperatures. The fuel (hydrogen) is used to test the electrochemical performance. The Raman data indicate a diminishing gap between the conduction and valance bands as the size of the material particle rises owing to red shifting. The band gap values of the materials dropped as the Transition metal changed, according to UV-visible analysis. The Bandgap values is (.(Y(NO3)3)0.2Sm (NO3)3(0.2) Ce (NO3)3(0.6) , (MoO3)0.2Sm (NO3)3(0.2) Ce (NO3)3(0.6) , (AgNO3)0.2 Sm (NO3)3(0.2) Ce (NO3)3(0.6) , (Na2WO4.H2O)0.2Sm (NO3)3(0.2) Ce (NO3)3(0.6) ) have been determined to be (Eg=3.14eV,5.76eV,3.02eV,3.04) respectively. The good electrochemical qualities of the produced samples were confirmed by the fact that the materials' conductivity increases as the sintering temperature rises. Since the transition metal-doped SDC electrolyte materials have improved electrical conductivity for SOFC applications, they have demonstrated good performance.