Fast approach for evaluating H₂S poisoning effects on solid oxide fuel cells fueled by carbon‐containing fuels such as biogas

Solid oxide fuel cells (SOFCs) convert a variety of fuels like hydrogen, e-gas, or biogas into electricity with high efficiency. Such fuels are interesting for reaching a production of electricity entirely from renewable energy sources. Sustainable fuels will play an important role because they are independent of fluctuating sources such as solar and wind. E-gas is a product of power-to-X concepts using electricity from renewable sources. Biogas is a renewable source and consists of 40%–70% CH₄ and 30%–60% CO₂. One advantage of the SOFC is that direct internal reforming of biogas or other hydrocarbons is possible. Impurities like sulfur components, which are present in fuels like biogas, can have negative effects on the internal reforming of the fuel in the SOFC and the electrochemical reaction as well. These effects have been widely investigated. The current study presents a new, time-efficient approach to investigating sulfur poisoning. It analyses how the electrochemical reaction and the methane reforming process are affected by H₂S via the evaluation of iV-curves recorded with and without sulfur. It yields the well-known parameter voltage drop occurring due to sulfur exposure.