Carbon-tolerance effects of Sm0.2Ce0.8O2-δ modified Ni/YSZ anode for solid oxide fuel cells under methane fuel conditions

Title
Carbon-tolerance effects of Sm0.2Ce0.8O2-δ modified Ni/YSZ anode for solid oxide fuel cells under methane fuel conditions
Authors
이정명김윤곤이성진김희수윤성필남석우윤순도윤정우
Keywords
Solid oxide fuel cell; SDC coating; Methane; Electrochemical oxidation; Carbon deposition
Issue Date
2014-05
Publisher
Journal of applied electrochemistry
Citation
VOL 44, NO 5, 581-588
Abstract
Samarium-doped ceria (SDC) is coated onto a Ni/yttria-stabilized zirconia (Ni/YSZ) anode for the direct use of methane in solid-oxide fuel cells. Porous SDC thin layer is applied to the anode using the sol–gel coating method. The experiment was performed in H2 and CH4 conditions at 800 °C. The cell performance was improved by approximately 20 % in H2 conditions by the SDC coating, due to the high ionic conductivity, the mixed ionic and electronic conductive property of the SDC, and the increased triple phase boundary area by the SDC coating in the anode. Carbon was hardly deposited in the SDC-coated Ni/YSZ anode. The cell performance of the SDC-coated Ni/YSZ anode did not show any significant degradation for up to 90 h under 0.1 A cm−2 at 800 °C. The porous thin SDC coating on the Ni/YSZ anode provided the electrochemical oxidation of CH4 over the whole anode, and minimized the carbon deposition by electrochemical carbon oxidation.
URI
http://pubs.kist.re.kr/handle/201004/48339
ISSN
0021891X
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