作者:
ES Dalgaard，M Mogens
关键词:
Solid Oxide Electrolysis Cell ； SOEC ； Carbon dioxide ； Electrolysis ； Synthetic fuel
摘要:
The passivation rate was independent of the current density and irreversible when operated at conditions that would oxidise carbon. This clearly shows that the passivation was not caused by coke formation. On the other hand, the passivation was partly reversible when introducing hydrogen. The passivation may be a consequence of impurities in the gas stream, most likely sulphur, adsorbing on some specific nickel sites in the cathode of the SOEC. Activation can be carried out by hydrogen reacting with adsorbed sulphur to form the volatile compound H 2 S. Because adsorption of sulphur is site specific, only a part of the nickel sites were passivated and long-time operation of CO 2 electrolysis in these Ni/YSZ electrode supported Solid Oxide Electrolysis Cells seems therefore feasible.
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