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MES research in electrode, materials. Siloxane, a common contaminant present in biogas, is known for adverse effects on cogenerati...

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Abstract

Siloxane, a common contaminant present in biogas, is known for adverse effects on cogeneration prime movers. In this study, the siloxane deposition products and mechanism in the solid oxide fuel cell nickel-yttria stabilized zirconia (Ni-YSZ) anode are investigated analytically and experimentally. An SOFC with Ni-YSZ anode and pure Ni/YSZ pellets were exposed to a simulated biogas-reformate fuel with octamethylcyclotetrasiloxane (D4) contamination at 750 °C. The electrochemical characterization results show that the SOFCs performance degradation caused by D4 contamination is irreversible. Morphology and XRD results illustrate that silicon and carbon deposition can both be detected in the anode and pellets. Graphite, SiC and SiO 2 are all possible products based on the results of XRD test. According to the formation of graphite and SiC, the new mechanism suggests that carbon is also an essential factor in siloxane contamination of Ni-YSZ anodes besides silicon, which can be explained by the catalytic and electrochemical analysis.

Keywords

OctamethylcyclotetrasiloxaneAnodeYttria-stabilized zirconiaSolid oxide fuel cellChemical engineeringCarbon fibers

Identifiers

DOI
10.1149/1945-7111/abf21a
Journal
Journal of The Electrochemical Society
Year
2021