11:00 AM - 12:00 PM
Qing Su, Texas A&M University, College Station
Materials Science and Technology Division Seminar
Chemical and Materials Sciences Building (4100), Room J-302
Email: Ho Nyung LeePhone:
Solid oxide fuel cells (SOFCs) are very attractive as energy generation devices because of their high energy efficiency, flexible fuel selections, and clean energy conversion. To avoid cell cracking and formation of nonconducting compounds at electrolyte/electrode interfaces issues caused by high operating temperatures (~1000ºC for conventional SOFCs), intermediate temperature SOFCs (ITSOFCs) in the range of 500ºC to 700ºC have attracted extensive research interests. However, the polarization loss of cathode and ohmic loss of electrolyte significantly increases under reduced temperatures which lead to decreased cell performance and power output. To address the above issues, the efforts in this work are focused on engineering microstructure of cathode, electrolyte and their interface to achieve high performance.
In this presentation, I would like to talk about a newly developed bilayer method to prepare bilayer La0.5Sr0.5CoO3(LSCO) cathodes and discuss the detailed interlayer thickness effect and mechanism of oxygen reduction reaction of those cathodes. I would also like to try to show two-phase (Ce0.9Gd0.1O1.95)0.5/(Zr0.92Y0.08O1.96)0.5 nanocomposite thin films with vertically aligned structure and superior ionic conductivity as the electrolyte for thin film solid oxide fuel cells (TFSOFCs).