High-Temperature Co-Electrolysis and Degradation by Oxidized Trace Contaminants in Feed Gases

For transforming our energy system, the indirect electrification of the sectors heating, mobility and chemical industry seems to be partially necessary. The high-temperature co-electrolysis for producing synthesis gas is very well suited as upstream process for power-to-fuel and power-to-chemicals processes. Besides the intrinsic degradation processes of the cells (e.g. nickel migration) and stacks (e.g. interconnect oxidation) any additional processes triggered by impurities in the feed gases are of relevance for any technical applications. The following manuscript summarizes the investigations performed to elucidate the impact of oxidized trace contaminants in feed gases, in particular of sulfur dioxide and silicon species.