In Situ Spectroscopic Studies of Carbon Formation in SOFCs Operating with Syn-gas

Vibrational Raman spectroscopy has been used to measure the rate and extent of carbon formation in SOFCs operating with CO/H2 mixtures at 675¢ªC. The SOFCs consist of commercial Ni/YSZ anode supported assemblies. Raman data show that carbon forms readily on anodes held at OCV and that the carbon dep...

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Bibliographic Details
Published in:ECS transactions 2013-01, Vol.57 (1), p.1267-1275
Main Authors: McIntyre, Melissa D., Kirtley, John D., Halat, David M., Reeping, Kyle W., Walker, Robert A.
Format: Article
Language:English
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Summary:Vibrational Raman spectroscopy has been used to measure the rate and extent of carbon formation in SOFCs operating with CO/H2 mixtures at 675¢ªC. The SOFCs consist of commercial Ni/YSZ anode supported assemblies. Raman data show that carbon forms readily on anodes held at OCV and that the carbon deposits consist of highly ordered graphite as evidenced by a single band at 1561 cm-1. Polarizing the SOFC limits the amount of carbon that forms. At currents approaching 75% Imax, where Imax corresponds to a 0.0V potential difference between the cathode and anode, observed carbon formation is completely suppressed. Interestingly, voltammetry data from these anode supported assemblies are unstable until small amounts of carbon form. This correlation between carbon formation observed in situ and electrochemical performance raises interesting questions about the role played by carbon in charge transfer processes and current collection in functioning devices.
ISSN:1938-5862
1938-6737
DOI:10.1149/05701.1267ecst