Department of Physics
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Item Effect of CO-Solvent Mediated Metal Ion Linker on Morphology and Electrochemical Performance of GO/PANI Hybrid(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2023) ATIQA SHAHZAD; CIIT/FA21-RPH-033/LHR; Dr. Muhammad Ashfaq Ahmad; LHR TP 8772In this study, the morphology of the GO/PANI composites will be investigated as electrode materials for storage devices like batteries and supercapacitor by preparing the nanocomposites via wet chemical facile synthesis with an appropriate selection of co-solvents and a variety of metal ion cross linkers. The structural and morphological characterizations including Xray-diffraction (XRD), Raman spectroscopy and Scanning electron microscopy (SEM) will be performed to gain an insight into structural and morphological properties of the nanostructures. Whereas the cyclic voltameter was performed to study the charge storage and capacitance mechanisms in the structures. In this project the GO/PANI composites were synthesized via facile wet chemical method by varying three different metal ion linkers ZnCl2, NaCl2 and LiI2. The effect of metal ion linker onto the structural properties of the synthesized composites were studied using XRD and Raman spectroscopy technique. The XRD results confirmed the synthesis of GO and PANI composite. The broad peaks of (113) and (002) plane of PANI and GO shows the amorphous behavior of the synthesized composite. The crystallite size and interplanar spacing of the composites were estimated using Scherrer formula and Bragg’s equations. The estimated crystallite size for (113) and (002) plane of PANI and GO are 2.50nm, 5.60nm, 6.00nm and 2.00nm, 2.23nm, 2.50nm respectively. The estimated interplanar spacing for (113) and (002) plane of PANI and GO are 0.49nm, 0.43nm, 0.44nm and 0.39nm, 0.38nm, 0.37nm respectively. The Raman spectroscopy shows the characteristic vibrational modes of GO and PANI in pure and composite samplesItem Evaluation of Electrochemical Performance and Polarization Losses of Proton-Conducting Electrolytes(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) AMEER HAMZA; CIIT/SP18-RPH-013/LHR; Dr. Muhammad Ashfaq Ahmad; LHR TP 6074The world is expected to face the crises of energy in near future and to overcome these crises fuel cells can play a vital role. The fuel cell is the one of the promising renewable energy sources as compared to other sources. We obtained electrical energy from chemical energy through electrochemical process. Now a day the research is about to achieve the structural improvement along high efficiency of Solid Oxide Fuel Cell (SOFC) at intermediate temperature. These cells have become the favorable energy source due to their inherent simplicity, low noise and insignificant pollutant emission and have efficiency greater than 50% in converting fuel to electricity through electrochemical reaction. There are three main parts of SOFC cathode, electrolyte and anode. Mainly these type of materials are selected for electrolyte. In this research work perovskite materials are used for electrolyte materials and investigate their effect on SOFC. The powders of BaCe0.7Y0.2Zr0.1O3-δ (BCYZ), as electrolyte material for SOFC were synthesized by using co-precipitation method. These samples are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR). These techniques were used to study their structure, crystalline size, microstructure, composition, functional group and morphology. With the help of these techniques we observed the effects and behavior of BCYZ. From XRD analysis it confirms crystalline size of the material. From SEM analysis pores are reduce and grain sizes increases. The bonds of hydroxyl groups and metal oxides are confirmed through FTIR analysis.