Simultaneous thermogravimetry - Mass spectrometry for a solid oxide fuel cell cathode: (La0.7Sr0.3)0.9MnO3

H. Yokokawa, N. Sakai, T. Horita, M. Dokiya, Tatsuya Kawada, Y. Takai, M. Todoki

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Abstract

A SOFC cathode related perovskite material, (La0.7Sr 0.3)0.9MnO3, has been investigated by simultaneous thermogravimetry - mass spectrometry from room temperature to 1770 K. Water, carbon dioxide and oxygen were detected by mass spectrometry. Water and carbon dioxide evolution can be interpreted by assuming that prior to the thermogravimetry-mass spectrometry measurement about 0.5 % of the lanthanum component had reacted with carbon dioxide and water to form La 2(CO3)3 *8H2O, which dehydrated and decomposed via La2O2CO3 into La2O3 and evolving H2O and CO2 during the present experiment. The observation that the lanthanum strontium manganite emitted oxygen in two stages can be ascribed to the two different oxygen sites in the perovskite lattice, that is, the oxygen excess and deficient regions.

Original languageEnglish
Pages (from-to)190-195
Number of pages6
JournalIonics
Volume2
Issue number3-4
DOIs
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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