Affiliation:
1. e-mail:
2. Kettering University, Mechanical Engineering Dept., 1700 West Third Avenue, Flint, MI 48504
Abstract
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.
Subject
Mechanical Engineering,Mechanics of Materials,Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Reference11 articles.
1. Materials for Fuel-Cell Technologies;Nature,2001
2. SOFC System and Technology;Solid State Ionics,2002
3. Solid Oxide Fuel Cells for Stationary, Mobile, and Military Applications;Solid State Ionics,2002
4. Solid Oxide Fuel Cells: Fundamental Aspects and Prospects;Electrochimica Acta,2000
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