Abstract
In the present study, the SOFC which are built by the National Metal and Materials Technology Center (MTEC) in Thailand were electrochemically characterized using polarization and transient techniques. The effect of diluting hydrogen with argon was studied and also the impact that the use of methane, as a zero order contaminant, was evaluated. To quantify the amount of carbon deposition, mass spectroscopy was used with samples collected at the outlet of the fuel cell during and after methane. The results obtained show that very small, and reversible, carbon deposition could be seen, as long as some current was applied to the fuel cell. However, if no current was applied while methane was flown, much stronger carbon deposition could be seen. This carbon deposition, at open circuit voltage proved to be irreversible leading to cell failure.
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