|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||135 Transference Number Measurements of MIECs: SSC and LSGM
||Ted C Yeh, Nicola H Perry, Thomas O Mason, Jules L Routbort
|On-Site Speaker (Planned)
||Ted C Yeh
Mixed ionic and electronic conductors (MIECs) can improve the performance of solid oxide fuel cell (SOFC) electrodes through increased efficiency and power output as well as decreased operating temperatures. However, accurate characterization of the minority species’ transference numbers can be difficult using traditional blocking electrode methods. Alternative methods for elucidating transference numbers are presented for highly electronic MIECs (strontium-doped samarium cobaltite, SSC) and highly ionic MIECs (strontium- and magnesium-doped lanthanum gallate, LSGM). This presentation focuses on the determination of oxygen diffusivity in SSC by Secondary Ion Mass Spectroscopy (SIMS) and on AC impedance spectroscopy measurements of electronic versus ionic conductivity in sub-100 nm polycrystalline LSGM. Ramifications for SOFC applications will also be discussed.