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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