Effects of gas velocity on formation of carbon deposits on AS-SOFC fuel electrodes

Konrad Motylinski, Marek Skrzypkiewicz, Yevgeniy Naumovich, Michał Wierzbicki, Jakub Kupecki


The elevated operating temperatures of solid oxide fuel cells (SOFC) create favorable kinetics for the oxidation of carboncontaining
gas mixtures, which may include carbon monoxide and light organic compounds. The presence of carbon-based
components in the fuel might result in the formation and deposition of soot on the surface of the anode in a fuel cell. This
process depends on and is driven by the prevailing thermodynamic, kinetic and electrochemical conditions. The present
study was premised on the following: in addition to the aforementioned parameters providing for the operating conditions,
gas velocity also affects the formation of deposits on the anode. The role of fuel gas velocity in the process was studied
experimentally using 5 cm x 5 cm anode supported solid oxide fuel cells (AS-SOFC) at 750°C at velocities in the range 0.1
to 0.9 m/s. It was found that carbon deposition was clearly observable approximately 24 hours after the necessary conditions
were attained. An intense stage of performance degradation typically lasts for a period of up to 60 hours. An increase in fuel
flow velocity leads to an acceleration in the carbon deposition process. The correlation between velocity and cell degradation
due to this phenomenon was determined and the corresponding function was proposed.


Boudouard Reaction, Carbon Deposition, SOFC, Soot Formation

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