Carbon and Sulfur Poisoning in SOFC Anodes: Ni 0.7 Co 0.3 -YSZ Performance with Hydrocarbons, Alcohols and Biodiesel Fuels Containing H 2 S

The poisoning behavior of hydrogen sulfide at the concentrations presented has the effect of lessening the amount of coke formation experienced at the anode site of the active Ni0.7Co0.3-YSZ cermet. Although the effect of coke formation becomes more dramatic and detrimental to the cell as the length...

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Bibliographic Details
Published in:ECS transactions 2010-10, Vol.28 (23), p.221-231
Main Authors: O'Brien, Julie S., Giorgi, Javier B.
Format: Article
Language:English
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Summary:The poisoning behavior of hydrogen sulfide at the concentrations presented has the effect of lessening the amount of coke formation experienced at the anode site of the active Ni0.7Co0.3-YSZ cermet. Although the effect of coke formation becomes more dramatic and detrimental to the cell as the length of the hydrocarbon chain increases, the ability of the hydrogen sulfide to protect the anode against coke formation also increases, producing a smaller reduction in exchange current density with increasing hydrocarbon length. For the case of biodiesel fuel, at a concentration of 5 % hydrogen sulfide, the exchange current density is higher and the cell survives much longer than with pure biodiesel fuel. Hydrogen sulfide also has the effect of increasing the lifetime of the cell to be several times that of the pure hydrocarbon fuel.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.3502353