CCS and Power Systems
Advanced Energy Systems - Solid Oxide Fuel Cells
Fundamental Investigators and Rational Design of Durable, High-Performance Cathode Materials
Performer: Georgia Tech Research Corporation
Project No: FE0009652
The Georgia Institute of Technology (Georgia Tech) will use specially-designed electrodes and cells, such as electrodes of thin films and patterned electrodes, to study the electrochemical response of lanthanum strontium cobalt ferrite (LSCF) cathodes under realistic operating conditions (ROC), to probe and map contaminants on the LSCF, and to characterize the correlation between electrochemical performance and microstructure/morphology of LSCF cathodes as well as their evolution over time. A range of characterization tools will be used to study the chemical and structural changes during fuel cell operation. Electrochemical techniques, such as impedance and DC polarization, will be intensively applied to characterize the cathode performance, which will be correlated with the structural and compositional evolution of the LSCF cathode under ROC. Proper characterization, modeling techniques, and prediction tools will be used to help in formulating an effective strategy to mitigate the stability issues and predict new catalyst materials that can enhance the stability of LSCF. Finally, the performance and stability of the modified LSCF cathode will be validated in commercially available cells under ROC.
The microstructure, morphology, and chemistry of LSCF cathodes will be carefully characterized and correlated with their electrochemical behavior under ROC to unravel the degradation mechanism. In particular, in situ and ex situ characterization of surface morphology and topography via atomic force microscopy, surface species via Raman spectroscopy, and surface phases via X-ray diffraction and Raman spectroscopy will be performed as a function of time. The well-defined cathode configuration will provide a unique platform for morphology observation, composition analysis, and in situ characterization. The resulting mechanistic understanding will guide the formulation of an effective strategy to mitigate the stability issues. Then multi-scale modeling and simulation will be used to suggest new cathode materials for experimental verification.