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The paper deals with the testing of performances of SOFC planar cells having as mechanical support either the anode or the electrolyte. Polarization traces at different temperature and hydrogen flow have been drawn to assess the electrochemical behavior and the limiting polarization factors of anode-supported and electrolyte-supported cells. The experimental data from polarization tests has then been summarized and analyzed through a parameter estimation technique, which allowed us to compare the performances of each cell throughout some defined macroscopic parameters, each one being referred and distinctive of a certain polarization overvoltage occurring during a SOFC operation. SEM and optical micrographs have been also collected in order to characterize the fine microstructure of the tested cells, and to discuss the macroscopic polarization results with reference to the microstructure.

Polarization Analysis and Microstructural Characterization of SOFC Anode and Electrolyte Supported Cells