Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ fine powders by carbonate coprecipitation for solid oxide fuel cells

Sang Bu Ha, Pyeong Seok Cho, Yoon Ho Cho, Dokyol Lee, Jong Heun Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A range of La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM) powders is prepared by the carbonate coprecipitation method for use as anodes in solid oxide fuel cells. The supersaturation ratio (R = [(NH4)2CO3]/([La3+] + [Sr2+] + [Cr3+] + [Mn2+])) during the coprecipitation determines the relative compositions of La, Sr, Cr, and Mn. The composition of the precursor approaches the stoichiometric one at the supersaturation range of 4 ≤ R ≤ 12.5, whereas Sr and Mn components are deficient at R < 4 and excessive at R = 25. The fine and phase-pure LSCM powders are prepared by heat treatment at very low temperature (1000 °C) at R = 7.5 and 12.5. By contrast, the solid-state reaction requires a higher heat-treatment temperature (1400 °C). The catalytic activity of the LSCM electrodes is enhanced by using carbonate-derived powders to manipulate the electrode microstructures.

Original languageEnglish
Pages (from-to)124-129
Number of pages6
JournalJournal of Power Sources
Volume195
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

Keywords

  • Carbonate coprecipitation
  • Lanthanum strontium chromium manganite electrode
  • Solid oxide fuel cell
  • Strontium- and magnesium-doped lanthanum gallate

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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