Phase stabilities in molten Li/K carbonate of efficient matrix materials for molten carbonate fuel cells

Thermodynamic calculations and experimental investigations

Kailash Yashvant Patil, Sung Pil Yoon, Jonghee Han, Tae Hoon Lim, SukWoo Nam, In Hwan Oh, Seong Ahn Hong

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, we investigated the thermodynamics and experimental performance of Al, Zr, and Ce species under anode and cathode gas conditions in Li/K carbonate at 650 °C. Among the Al, Zr, and Ce species investigated, we found that lithium aluminate (LiAlO 2), lithium zirconate (Li 2ZrO 3), and cerium/ceria oxide (CeO 2) were the most stable materials. Experimentally, we performed immersion tests in molten (Li 0.62/K 0.38) 2CO 3 at 650 °C to evaluate the phase and microstructure stabilities of these materials. The γ-LiAlO 2 phase transformation, determined using X-ray diffractometry, was dependent on the immersion time. We performed similar measurements for α-LiAlO 2, Li 2ZrO 3, and CeO 2 materials in molten Li/K carbonate at 650 °C. From immersion tests, the presence of the α-LiAlO 2 phase revealed that phase transformation of γ-LiAlO 2 occurs in Li/K carbonate melts under cathode gas atmospheres; in contrast, no phase transformation was evident after immersion of the pure α-LiAlO 2 phase in molten carbonate for 5,000 h. Furthermore, we found that Li 2ZrO 3 and CeO 2 were stable phases after immersion in molten carbonate at 650 °C, under both anode and cathode gas atmospheres, for more than 5,000 h.

Original languageEnglish
Pages (from-to)2557-2567
Number of pages11
JournalJournal of Materials Science
Volume46
Issue number8
DOIs
Publication statusPublished - 2011 Apr 1
Externally publishedYes

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Molten carbonate fuel cells (MCFC)
Phase stability
Carbonates
Molten materials
Thermodynamics
Cathodes
Gases
Phase transitions
Anodes
Lithium
Cerium
Cerium compounds
Oxides
X ray diffraction analysis
Microstructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Phase stabilities in molten Li/K carbonate of efficient matrix materials for molten carbonate fuel cells : Thermodynamic calculations and experimental investigations. / Patil, Kailash Yashvant; Yoon, Sung Pil; Han, Jonghee; Lim, Tae Hoon; Nam, SukWoo; Oh, In Hwan; Hong, Seong Ahn.

In: Journal of Materials Science, Vol. 46, No. 8, 01.04.2011, p. 2557-2567.

Research output: Contribution to journalArticle

Patil, Kailash Yashvant ; Yoon, Sung Pil ; Han, Jonghee ; Lim, Tae Hoon ; Nam, SukWoo ; Oh, In Hwan ; Hong, Seong Ahn. / Phase stabilities in molten Li/K carbonate of efficient matrix materials for molten carbonate fuel cells : Thermodynamic calculations and experimental investigations. In: Journal of Materials Science. 2011 ; Vol. 46, No. 8. pp. 2557-2567.
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