Fabrication of gradient porous LSM cathode by optimizing deposition parameters in ultrasonic spray pyrolysis

Hoda Amani Hamedani, Klaus Hermann Dahmen, Dongsheng Li, Houman Peydaye-Saheli, Hamid Garmestani, M. Khaleel

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Multiple-step ultrasonic spray pyrolysis was developed to produce a gradient porous lanthanum strontium manganite (LSM) cathode on yttria-stabilized zirconia (YSZ) electrolyte for use in intermediate temperature solid oxide fuel cells (IT-SOFCs). The effect of solvent and precursor type on the morphology and compositional homogeneity of the LSM film was first identified. The LSM film prepared from organo-metallic precursor and organic solvent showed a homogeneous crack-free microstructure before and after heat treatment as opposed to aqueous solution. With respect to the effect of processing parameters, increasing the temperature and solution flow rate in the specific range of 520-580 °C leads to change the microstructure from a dense to a highly porous structure. Using a dilute organic solution a nanocrystalline thin layer was first deposited at 520 °C and solution flow rate of 0.73 ml/min on YSZ surface; then, three gradient porous layers were sprayed from concentrated solution at higher temperatures (540-580 °C) and solution flow rates (1.13-1.58 ml/min) to form a gradient porous LSM cathode film with ∼30 μm thickness. The microstructure, phase crystallinity and compositional homogeneity of the fabricated films were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive analysis of X-ray (EDX). Results showed that the spray pyrolized gradient film fabricated in the temperature range of 520-580 °C is composed of highly crystalline LSM phase which can remove the need for subsequent heat treatment.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume153
Issue number1-3
DOIs
Publication statusPublished - 25 Sep 2008
Externally publishedYes

Fingerprint

Lanthanum
Strontium
Spray pyrolysis
lanthanum
strontium
pyrolysis
sprayers
Cathodes
ultrasonics
cathodes
Ultrasonics
Fabrication
gradients
fabrication
flow velocity
yttria-stabilized zirconia
Yttria stabilized zirconia
microstructure
Flow rate
homogeneity

Keywords

  • Gradient porous cathodes
  • IT-SOFCs
  • LSM
  • Spray pyrolysis

ASJC Scopus subject areas

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

Cite this

Fabrication of gradient porous LSM cathode by optimizing deposition parameters in ultrasonic spray pyrolysis. / Hamedani, Hoda Amani; Dahmen, Klaus Hermann; Li, Dongsheng; Peydaye-Saheli, Houman; Garmestani, Hamid; Khaleel, M.

In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 153, No. 1-3, 25.09.2008, p. 1-9.

Research output: Contribution to journalArticle

Hamedani, Hoda Amani ; Dahmen, Klaus Hermann ; Li, Dongsheng ; Peydaye-Saheli, Houman ; Garmestani, Hamid ; Khaleel, M. / Fabrication of gradient porous LSM cathode by optimizing deposition parameters in ultrasonic spray pyrolysis. In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 2008 ; Vol. 153, No. 1-3. pp. 1-9.
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