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Electrode performance in reversible solid oxide fuel cells
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DOI：10.1149/1.2710209.png)
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摘要
En 中文
The performance of several negative (fuel) and positive (air) electrode compositions for use in reversible solid oxide fuel cells capable of operating both as a fuel cell and as an electrolyzer was investigated in half-cell and full-cell tests. Negative electrode compositions studied were a nickel/zirconia cermet (Ni/YSZ) and lanthanum-substituted strontium titanate/ceria composite, whereas positive electrode compositions examined included mixed ion- and electron-conducting lanthanum strontium ferrite (LSF), lanthanum strontium copper ferrite (LSCuF), lanthanum strontium cobalt ferrite (LSCoF), and lanthanum strontium manganite (LSM). While titanate/ceria and Ni/YSZ electrodes performed similarly in the fuel cell mode in half-cell tests, losses associated with electrolysis were lower for the titanate/ceria electrode. Positive electrodes gave generally higher losses in the electrolysis mode when compared to the fuel cell mode. This behavior was most apparent for mixed-conducting LSCuF and LSCoF electrodes, and discernible but smaller for LSM; observations were consistent with expected trends in the interfacial oxygen vacancy concentration under anodic and cathodic polarization. Full-cell tests conducted for cells with a thin electrolyte (7 mu m YSZ) similarly showed higher polarization losses in the electrolysis than fuel cell direction. (c) 2007 The Electrochemical Society.
Keyword:
HIGH-TEMPERATURE ELECTROLYSIS
SR-DOPED LAMNO3
OXIDATION-REDUCTION BEHAVIOR
OXYGEN-TRANSPORT
ELECTRICAL-CONDUCTIVITY
HYDROGEN-PRODUCTION
DEFECT STRUCTURE
WATER-VAPOR
LA1-XSRXFEO3-DELTA MEMBRANES
IMPEDANCE SPECTROSCOPY
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期刊
IF:
3.3
论文数:
3.3W
被引数:
9.4W
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