Abstract
Solid oxide fuel cell (SOFC) technology offers reliable and efficient power generation from electrochemical oxidation of fuel gasses. State-of-the-art (SoA) anodes based on Ni cermets are prone to poisoning by fuel impurities, including sulfur. Next generation anode materials should be more robust towards sulfur poisoning e.g. in the event of failure or expiry of desulfurization units utilized in SOFC systems. Herein we present the performance and sulfur tolerance of short stacks with large area electrolyte supported cells with Ni:Ce0.8Gd0.2O1.9 (CGO) and FeNi:CGO co-infiltrated La0.4Sr0.4Fe0.03Ni0.03Ti0.94O3 (LSFNT) anodes tested under real-life conditions using reformed grid natural gas and an upstream, bypassable desulfurization unit. The initial performance at 750 °C and 850 °C was similar to a SoA cell with Ni/CGO cermet anode for both types of infiltrate. Bypassing the desulfurization unit led to a much lower performance loss compared to SoA. Additionally, the cells with LSFNT anodes showed almost complete recovery of performance after stopping the exposure to sulfur, whereas the reference SoA cell experienced some degree of irreversible degradation. Based on the promising initial performance and tolerance towards failure of desulfurization units, LSFNT anodes infiltrated with non-noble electrocatalysts are attractive candidates for next generation SOFC systems.
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