Wetting of Porous α-LiAlO 2 by Molten Carbonate
Abstract
Cracking of α-LiAlO2 matrices in molten carbonate fuel cells (MCFC) leads to reduction in the performance. It was demonstrated in this work that the mechanical strength of α-LiAlO2 matrices is improved by heat-treating at 800°C under ambient gas atmosphere. The mechanical strength (2.91MPa) of the heat-treated matrix was enhanced more than 5 fold compared to the non-heat-treated matrix (0.58MPa). The porosity and crystal structure of the α-LiAlO2 matrices were not changed after the heat-treatment. The wetting behavior and distribution of carbonate in the heat-treated and the non-heat-treated matrix were investigated and compared. Both non-heat-treated and heat-treated α-LiAlO2 matrices were completely wetted by molten carbonate. The molten carbonate distribution was concentrated right underneath the circular region formed by the molten carbonate drop in the matrix. Non-heat-treated α-LiAlO2 samples cracked as a result of the complete absorption of molten carbonate, however, the heat-treated α-LiAlO2 matrices did not crack, presumably due to their enhanced mechanical strength.
- Authors:
-
- Illinois Inst. of Tech. (IIT), Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Illinois Inst. of Tech. (IIT), Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1509888
- Grant/Contract Number:
- EE0006606
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 165; Journal Issue: 5; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Gao, Liangjuan, Selman, J. Robert, and Nash, Philip. Wetting of Porous α-LiAlO 2 by Molten Carbonate. United States: N. p., 2018.
Web. doi:10.1149/2.0771805jes.
Gao, Liangjuan, Selman, J. Robert, & Nash, Philip. Wetting of Porous α-LiAlO 2 by Molten Carbonate. United States. https://doi.org/10.1149/2.0771805jes
Gao, Liangjuan, Selman, J. Robert, and Nash, Philip. Fri .
"Wetting of Porous α-LiAlO 2 by Molten Carbonate". United States. https://doi.org/10.1149/2.0771805jes. https://www.osti.gov/servlets/purl/1509888.
@article{osti_1509888,
title = {Wetting of Porous α-LiAlO 2 by Molten Carbonate},
author = {Gao, Liangjuan and Selman, J. Robert and Nash, Philip},
abstractNote = {Cracking of α-LiAlO2 matrices in molten carbonate fuel cells (MCFC) leads to reduction in the performance. It was demonstrated in this work that the mechanical strength of α-LiAlO2 matrices is improved by heat-treating at 800°C under ambient gas atmosphere. The mechanical strength (2.91MPa) of the heat-treated matrix was enhanced more than 5 fold compared to the non-heat-treated matrix (0.58MPa). The porosity and crystal structure of the α-LiAlO2 matrices were not changed after the heat-treatment. The wetting behavior and distribution of carbonate in the heat-treated and the non-heat-treated matrix were investigated and compared. Both non-heat-treated and heat-treated α-LiAlO2 matrices were completely wetted by molten carbonate. The molten carbonate distribution was concentrated right underneath the circular region formed by the molten carbonate drop in the matrix. Non-heat-treated α-LiAlO2 samples cracked as a result of the complete absorption of molten carbonate, however, the heat-treated α-LiAlO2 matrices did not crack, presumably due to their enhanced mechanical strength.},
doi = {10.1149/2.0771805jes},
journal = {Journal of the Electrochemical Society},
number = 5,
volume = 165,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2018},
month = {Fri Mar 30 00:00:00 EDT 2018}
}
Web of Science
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Works referencing / citing this record:
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journal, January 2019
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Screening of electrode materials and cell concepts for composite ceria + salt electrolytes
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