Thermodynamic Stability Assessment of MIEC Cathode Materials for Solid Oxide Fuel Cells
Tuesday, 28 July 2015: 15:00
Boisdale (Scottish Exhibition and Conference Centre)
Mixed ionic-electronic conductor (MIEC) cathode materials such as La(1-x)
(LSCF,where x=0.2, 0.3, 0.4), Ba0.5
(BSCF 5582), Sr2
(GBCO), and PrBaCo2
(PBCO) exhibit excellent oxygen transport properties as well as high electronic conductivity at operational temperatures of SOFCs. Their promising electrochemical performance make these materials excellent candidates for potential application as SOFC cathodes. However, their long-term thermodynamic stability in the operating environment of SOFCs, including unexpected and uncommon situations such as CO2
-leakage from the anodic side is of concern and should be thoroughly investigated prior to deploying them in cells and stacks.
This study investigates the thermodynamic stability of promising SOFC cathodes under operating conditions, in molten salt media, and through galvanic cell measurements. The cathode materials of interest are La(1-x)SrxCo0.2Fe0.8O3-δ (LSCF, where x=0.2, 0.3, 0.4), Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF 5582), Sr2Fe1.5Mo0.5O6-δ (SFMO), La2NiO4+δ (LNO), GdBaCo2O6-δ (GBCO), and PrBaCo2O6-δ (PBCO). The stability of these materials is studied in air and at various CO2 partial pressures.