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Science 2 October 2009:
Vol. 326. no. 5949, pp. 126 - 129
DOI: 10.1126/science.1174811
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Reports

Enhanced Sulfur and Coking Tolerance of a Mixed Ion Conductor for SOFCs: BaZr0.1Ce0.7Y0.2–xYbxO3–{delta}

Lei Yang, Shizhong Wang, Kevin Blinn, Mingfei Liu, Ze Liu, Zhe Cheng, Meilin Liu*

The anode materials that have been developed for solid oxide fuel cells (SOFCs) are vulnerable to deactivation by carbon buildup (coking) from hydrocarbon fuels or by sulfur contamination (poisoning). We report on a mixed ion conductor, BaZr0.1Ce0.7Y0.2–xYbxO3–{delta}, that allows rapid transport of both protons and oxide ion vacancies. It exhibits high ionic conductivity at relatively low temperatures (500° to 700°C). Its ability to resist deactivation by sulfur and coking appears linked to the mixed conductor’s enhanced catalytic activity for sulfur oxidation and hydrocarbon cracking and reforming, as well as enhanced water adsorption capability.

School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, Atlanta, GA 30332, USA.

* To whom correspondence should be addressed. E-mail: meilin.liu{at}mse.gatech.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Poison-Tolerant Fuel Cells.
J. R. Selman (2009)
Science 326, 52-53
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