About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
MIEC Sr2-xVMoO6-δ Ceramic Fuel Electrodes for SOFC/SOEC Operation |
Author(s) |
Julia A. Esakoff, Bamidele Samuel, David R. Driscoll, Robert A. Walker, Stephen W. Sofie |
On-Site Speaker (Planned) |
Julia A. Esakoff |
Abstract Scope |
Mixed Ionic & Electronic conductors (MIEC) appeal within solid oxide fuel cell (SOFC) and electrolyzer (SOEC) applications by eliminating triple-phase boundaries conducive of two-dimensional electroactive surfaces while preventing hydrocarbon fuel poisoning. However, many perovskite materials require supplemental infiltration with nano-scale metals improving catalysis and conductivity of entirely ceramic systems. Sr2-xVMoO6-δ (SVMO) double perovskites (x = 0.05-0.2) are enticing due to their extraordinary electronic conductivity coupled with low-temperature oxygen ion conduction. Electrolyte-supported SOFCs fabricated via aerosol spraying methods utilizing SVMO as the fuel electrode and La1-xSrxMnO3-δ/YSZ as the cathode are reported. Processes also include exploring various buffering mediums between the SVMO and YSZ electrolyte to restrict unfavorable reactions. In-situ Raman spectroscopy and electrochemical impedance spectroscopy evaluate SVMO’s fuel electrode performance at operating temperatures. X-ray diffraction, scanning electron microscopy, and electron-dispersive spectroscopy ensure cell stability pre- and post-SOFC testing. Processing-properties relationships regarding fuel electrode fabrication parameters are analyzed through electrochemical performance trends. |