Wetting of Porous α-LiAlO 2 by Molten Carbonate
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.
- Research Organization:
- Illinois Inst. of Tech. (IIT), Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- EE0006606
- OSTI ID:
- 1509888
- Journal Information:
- Journal of the Electrochemical Society, Vol. 165, Issue 5; ISSN 0013-4651
- Publisher:
- The Electrochemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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