Effect of Sm0.2Ce0.8O1.9 on the carbon coking in Ni-based anodes for solid oxide fuel cells running on methane fuel

Title
Effect of Sm0.2Ce0.8O1.9 on the carbon coking in Ni-based anodes for solid oxide fuel cells running on methane fuel
Authors
윤정우윤성필김희수한종희남석우
Keywords
SOFC; Solid oxide fuel cell; SDC coating; Methane; Electrochemical oxidation; Carbon deposition
Issue Date
2012-03
Publisher
International journal of hydrogen energy
Citation
VOL 37, NO 5, 4356-4366
Abstract
To directly use hydrocarbon fuel without a reforming process, a new microstructure for Ni/ Sm0.2Ce0.8O2 d (Ni/SDC) anodes, in which the Ni surface of the anode is covered with a porous Sm0.2Ce0.8O2 d thin film, was investigated as an alternative to conventional Ni/ YSZ anodes. The porous SDC thin layer was coated on the pores of the anode using the solegel coating method. The cell performance was improved by 20%e25% with the Ni/SDC anode relative to the cell performance with the Ni/YSZ anode due to the high ionic conductivity of the Ni/SDC anode and the increase of electrochemical reaction sites. For the SDC-coated Ni/SDC anode operating with methane fuel, no significant degradation of the cell performance was observed after 180 h due to the surface modification with the SDC film on the Ni surface, which opposes the severe degradation of the cell performance that was observed for the Ni/YSZ anode, which results from carbon deposition by methane cracking. Carbon was hardly detected in the SDC-coated Ni/SDC anode due to the catalytic oxidation of the deposited carbon on the SDC film as well as the electrochemical oxidation of methane in the triple-phase-boundary.
URI
http://pubs.kist.re.kr/handle/201004/42044
ISSN
03603199
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