New buffer layer material La(Pr)CrO 3 for intermediate temperature solid oxide fuel cell using LaGaO 3-based electrolyte film

Young Wan Ju, Jong Eun Hong, Junji Hyodo, Toru Inagaki, Shintaro Ida, Tatsumi Ishihara

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A metal-supported solid oxide fuel cell (SOFC) using Ce 0.8Sm 0.2O 2 (Sm-doped ceria, SDC) buffer layer and La 0.9Sr 0.1Ga 0.8Mg 0.2O 3 (LSGM) electrolyte films showed a small degradation in the cell performance after a long-term operation because of La migration from the electrolyte to the buffer layer, resulted in a formation of a less conductive phase. Thus, various ceramic materials such as doped ceria and perovskite-related oxides were investigated for an effective buffer layer with respect to fabricating reliable metal-supported SOFCs using a LSGM electrolyte film. In particular, La-doped CeO 2 (LDC) and Pr-doped LaCrO 3 (LPCr) were investigated as buffer layer material since the materials showed chemical compatibility with the LSGM and anode materials. The cell using a LDC buffer layer showed a prior stability during the operation for 100 h at 973 K, while the power density of the cell was slightly low owing to the low electrical conductivity of LDC compared with that of SDC or LPCr. In contrast, the cell using a LPCr buffer layer revealed significantly low open circuit voltage (OCV) and power density, which were attributed to Pr decomposition in the LPCr caused by the reactivity with water vapor. However, the metal-supported cell with a multilayer electrolyte film including LSGM/LPCr/SDC layers showed an almost theoretical OCV and reasonably high power density with no degradation after a long-term operation for 100 h at 973 K, suggesting that the LPCr layer effectively prevented La migration and the SDC layer led to avoid the Pr decomposition. Thus, a LPCr is an effective buffer layer material for reliable metal-supported SOFCs using a LSGM electrolyte thin film.

Original languageEnglish
Pages (from-to)1906-1914
Number of pages9
JournalJournal of Materials Research
Volume27
Issue number15
DOIs
Publication statusPublished - Aug 14 2012

Fingerprint

Buffer layers
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Electrolytes
Cerium compounds
buffers
electrolytes
Metals
Temperature
Open circuit voltage
temperature
radiant flux density
cells
open circuit voltage
Decomposition
metals
Degradation
Steam
Ceramic materials
chemical compatibility

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

New buffer layer material La(Pr)CrO 3 for intermediate temperature solid oxide fuel cell using LaGaO 3-based electrolyte film. / Ju, Young Wan; Hong, Jong Eun; Hyodo, Junji; Inagaki, Toru; Ida, Shintaro; Ishihara, Tatsumi.

In: Journal of Materials Research, Vol. 27, No. 15, 14.08.2012, p. 1906-1914.

Research output: Contribution to journalArticle

Ju, Young Wan ; Hong, Jong Eun ; Hyodo, Junji ; Inagaki, Toru ; Ida, Shintaro ; Ishihara, Tatsumi. / New buffer layer material La(Pr)CrO 3 for intermediate temperature solid oxide fuel cell using LaGaO 3-based electrolyte film. In: Journal of Materials Research. 2012 ; Vol. 27, No. 15. pp. 1906-1914.
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