Unraveling Oxygen Reduction Reaction at Solid Oxide Fuel Cell Cathodes
EMSL Project ID
46707
Abstract
We seek to uncover the role of the structure and chemistry of the surfaces of solid oxide fuel cell cathodes in the oxygen reduction reaction. In particular we seek to understand the relationship of the composition and defect chemistry of the surfaces of doped lanthanum manganite and lanthanum iron cobal oxide cathodes to the oxygen reduction process. In the proposed work we fabricate thin films of the aforementioned cathode materials on appropriate solid electrolytes and measure the surface structure and composition using TXRF and XANES spectroscopy. In another experiment we propose to deposit patterned thin film electrodes of the aforementioned cathode materials on suitable electrolyte substrates, and obtain kinetic parameters such as oxygen surface coverage, diffusivities (bulk and surface) and oxygen incorporation reaction rate constants by performing electrochemical impedance spectroscopy on such films. The final goal is to correlate the insights obtained about the surface structure and defect chemistry to the kinetic parameters obtained from modeling impedance spectroscopy data.
Project Details
Project type
Exploratory Research
Start Date
2012-02-14
End Date
2013-02-24
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Surface evolution of lanthanum strontium cobalt ferrite thin films at low temperatures
Newby Jr. D, J Kuyyalil, J Laverock, KF Ludwig, Y Yu, JN Davis, S Gopalan, UB Pal, SN Basu, and KE Smith. 2015. "Surface Evolution of Lanthanum Strontium Cobalt Ferrite Thin Films at Low Temperatures." , Pacific Northwest National Laboratory, Richland, WA. doi:10.1016/j.tsf.2015.06.037 [Unpublished]