Ceria Coatings Effect on H2S Poisoning of Ni/YSZ Anodes for Solid Oxide Fuel Cells

Title
Ceria Coatings Effect on H2S Poisoning of Ni/YSZ Anodes for Solid Oxide Fuel Cells
Authors
윤정우윤성필한종희박상균김희수남석우
Issue Date
2010-12
Publisher
Journal of the Electrochemical Society
Citation
VOL 157, NO 12, B1825-B1830
Abstract
Ceria is a good sulfur sorbent under reducing atmospheres because of its high affinity for sulfide at high temperatures. In this study, to enhance the sulfur tolerances of anodes for solid oxide fuel cells, we have used a dip-coating method to modify the pore wall surfaces of conventional nickel/yttria-stabilized zirconia (Ni/YSZ) anodes by coating them with ceria nanoparticles (10–20 nm). We have monitored the sulfur poisoning process in various H2S concentrations at 700°C. Because the ceria reacted with H2S to form Ce2O2S, which acted as a sulfur sorbent, Ni3S2 was hardly formed in the ceria-coated Ni/YSZ anode; therefore, its performance dropped to a lesser degree relative to that of the conventional Ni/YSZ anode. Furthermore, impedance spectroscopy revealed that the polarization resistance increased upon increasing the H2S concentration. Our results suggest that ceria nanocoatings on Ni–YSZ anodes provide greater sulfur tolerance at higher H2S concentrations ( >=200 ppm) and lower operating temperatures (700°C).
URI
http://pubs.kist.re.kr/handle/201004/45606
ISSN
0013-4651
Appears in Collections:
KIST Publication > Article
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