ECS Meeting Abstracts, 12(MA2009-02), p. 1349-1349, 2009
DOI: 10.1149/ma2009-02/12/1349
The Electrochemical Society, ECS Transactions, 2(25), p. 2435-2442, 2009
DOI: 10.1149/1.3205798
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Nano-composite SSC (Sm0.5Sr0.5CoO3-x) - GDC (Ce0.9Gd0.1O1.95) Solid Oxide Fuel Cell cathodes were produced by infiltrating SSC nitrate solutions with/without additives into GDC scaffolds. X-ray diffraction indicated that fired precursor solutions containing the surfactant Triton X-100 had less secondary phases than similarly processed pure nitrate solutions. Further, precursor solutions containing citric acid, a chelating agent, produced nearly phase-pure SSC after 1 hour at 800{degree sign}C. These solution additives did not have a large effect on the cathode polarization resistance. In contrast, alterations of the infiltration procedure influenced the SSC nano-particle size and hence the polarization resistance. Polarization resistances of 0.1 Wcm2 at 600{degree sign}C were achieved with a single infiltration of concentrated solution. Polarization resistance predictions made using microstructural observations and a modified Tanner, Fung, Virkar model were found to be within 40% (without fitting parameters) of the experimentally measured values, regardless of the testing temperature, cathode thickness, solution additives, and cathode synthesis conditions.