Molten salt synthesis of La 0.8Sr 0.2MnO 3 powders for SOFC cathode electrode

Sin Il Gu, Hyo Soon Shin, Youn Woo Hong, Dong Hun Yeo, Jong Hee Kim, Sahn Nahm, Sang Ok Yoon

Research output: Contribution to journalArticle

Abstract

For La 0.8Sr 0.2MnO 3 (LSM) perovskite, used as the cathode material for solid oxide fuel cells (SOFC), it is known that the formation of a triple-phase-boundary is restrained due to the formation of a second phase at the YSZ/electrode interface at high temperature. To decrease the 2 nd phase, lowering the sintering temperature has been used. LSM powder was synthesized by molten salt synthesis method to control its particle size, shape, and agglomeration. We have characterized the phase formation, particle size, shape, and sintering behavior of LSM in the synthesis using the variation of KCl, LiCl, KF and its mixed salts as raw materials. In the case of KCl and KCl-KF salts, the particle size and shape of the LSM was well controlled and synthesized. However, in the case of LiCl and KCl-LiCl salts, LiMnO x as 2 nd phase and LSM were synthesized simultaneously. In the case of the mixed salt of KCl-KF, the growth mechanism of the LSM particle was changed from 'diffusion-controlled' to 'reaction-controlled' according to the amount of mixed salt. The sintering temperature can be decreased below 1000 °C by using the synthesized LSM powder.

Original languageEnglish
Pages (from-to)723-726
Number of pages4
JournalMetals and Materials International
Volume18
Issue number4
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • Cathode material
  • Chemical synthesis
  • Fuel cells
  • Phase transformation
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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