Impregnation of La0.4Ce0.6O1.8–La0.4Sr0.6TiO3 as solid oxide fuel cell anode in H2S-containing fuels

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2014.10.052
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume274
Pages211218
Subjectsolid oxide fuel cells anode; H2S; impregnation; lanthanum strontium titanate; lanthanum cerium oxide
AbstractActive anodes were fabricated via wet chemical impregnation of optimized amount of La0.4Sr0.6TiO3 (L4ST) into La0.4Ce0.6O1.8 (LDC) pre-infiltrated porous yttria-stabilized zirconia (YSZ) matrix. Impregnations of 10 wt% LDC with 16 wt% L4ST significantly improved the performance of the fuel cell from 48 mW cm−2 for pure L4ST to 161 mW cm−2 for LDC–L4ST at 900 °C in H2. The contribution of the pre-loaded LDC to this improvement was investigated using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) as well as transmission electron microscopy (TEM). The measurement results indicated that pre-infiltrated LDC increased the activity of the anode more effectively by decreasing the total polarization resistance of the cell from 3.3 Ω cm2 to 1.0 Ω cm2 in humidified H2 at 900 °C. More importantly, the LDC nano-deposits (<20 nm) behaved as an effective “adhesive” that substantially enhanced the wettability of L4ST on YSZ matrix, resulting in finer and more uniform structure of L4ST infiltrates. The LDC–L4ST cells also demonstrated significantly improved performances in 0.5% H2S–H2 and 0.5% H2S–CH4 with higher stability than cells with pure L4ST anode.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number23001507
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Record identifier6780e711-8255-4046-925f-4a1f8ce96e3a
Record created2017-02-20
Record modified2017-02-20
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