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Title: 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:
ORCiD logo [1];  [1];  [1]
  1. 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}
}

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Cited by: 13 works
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Works referencing / citing this record:

Supported molten-salt membranes for carbon dioxide permeation
journal, January 2019

  • Mutch, Greg A.; Qu, Liu; Triantafyllou, Georgios
  • Journal of Materials Chemistry A, Vol. 7, Issue 21
  • DOI: 10.1039/c9ta01979k

Screening of electrode materials and cell concepts for composite ceria + salt electrolytes
journal, October 2018

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