A study of carbon anode polarization in fused carbonate fuel cells Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gb19f9581

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  • The graphite anode reaction in a fused carbonate electrolyte is studied theoretically and experimentally. Data on open circuit cell potentials indicate, for operation below 900°C, only a small fraction of the free energy of reaction is converted to electrical work. Anode polarization measurements were made for current densities of up to 77.5 ma/cm² for several temperatures between 600°C and 940°C. Initial polarization is shown to be capacitive in nature and accounts for up to 75 percent of the anode polarization. The double layer charge capacitance is 308 ± 15 microfarads per square centimeter at 600°C. A number of chemical analyses of the anode reaction product gases are made for current densities from 13.7 ma/cm² to 141 ma/cm² and for temperatures from 650°C to 870°C. High concentrations of carbon dioxide in the reaction product gas, combined with measured gas evolution rates for various cell currents, show that the main cell reaction corresponds to one which results in the oxidation of carbon electrochemically to carbon dioxide. The presence of carbon monoxide, at all temperatures investigated, indicates that the anode reaction is a multistep process which includes the production of carbon monoxide as an intermediate species.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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