This paper reports a new study where relatively long-term tests of about a 1000 h are performed on several planar anode-supported solid oxide fuel cells. The cell electrochemical behaviors are studied by using voltage-current density measurement, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The cell total polarization obtained from electrochemical impedance spectroscopy results is shown to be consistent with the area-specific resistance calculated from the voltage-current density curve over the course of the test. In addition, a four-constant phase element model is used to analyze the cell components resistances at different intervals over the lifetime of the test. Scanning electron microscopy and energy-dispersive X-ray spectroscopy are used postmortem to determine if any damages occurred to the cells and to determine if any change in composition occurred to the lanthanum strontium cobalt ferrite cathode. This study shows that the tested cells remain stable with a relatively small increase in the cell total polarization but with no increase in ohmic resistance.
Long-Term SOFCs Button Cell Testing
Mechanical Engineering Dept.,
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received April 10, 2013; final manuscript received October 18, 2013; published online December 5, 2013. Assoc. Editor: Dr Masashi Mori.
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DiGiuseppe, G., and Sun, L. (December 5, 2013). "Long-Term SOFCs Button Cell Testing." ASME. J. Fuel Cell Sci. Technol. April 2014; 11(2): 021007. https://doi.org/10.1115/1.4025924
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