MSE PhD Prospectus Defense of Deniz Cetin

9:30 am on Friday, December 12, 2014
11:30 am on Friday, December 12, 2014
15 Saint Mary's Street, Rm 105
TITLE: Investigation of Cathode Stability of Solid Oxide Fuel Cells and the Electrochemical Performance of New Cathode Materials for Co-sintering Process ABSTRACT: The need for cleaner and more efficient alternative energy sources is becoming urgent as concerns mount about climate change wrought by greenhouse gas emissions. Solid oxide fuel cells (SOFCs) are one of the most efficient options if the goal is to reduce emissions while still operating on fossil energy resources. One of the foremost problems in SOFCs that causes efficiency loss is the polarization resistance due to the oxygen reduction reaction (ORR) at the cathodes. Hence, improving the cathode design will greatly enhance the overall performance of SOFCs. This project has two main goals: (i) to assess stability of commonly used cathode materials in the operating environment of SOFCs, including unexpected and uncommon situations such as CO2-leakage from the anodic side and (ii) to investigate the electrochemical performance of the cathode materials that pass the initial stability tests in the presence of gas phase impurities. We plan to investigate a broad-range of promising cathode materials to find those with the highest performance. A second goal is also to find cathodes suitable for the cosintering of SOFCs. The cathode materials of interest in this study are La(1-x)SrxCo0.2Fe0.8O3-δ (LSCF, where x=0.2, 0.3, 0.4), Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), Sr2Fe1.5Mo0.5O6-δ (SMFO), La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM), La2NiO4+δ (LNO), GdBaCo2O6-δ (GBCO), and PrBaCo2O6-δ (PBCO). COMMITTEE: Advisor: Srikanth Gopalan, MSE/ME; Uday Pal, MSE/ME; Soumendra N. Basu, MSE/ME; Emily Ryan, MSE/ME