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Research Papers

Solution Precursor Plasma Spray of Porous La1xSrxMnO3 Perovskite Coatings for SOFC Cathode Application

[+] Author and Article Information
Y. Wang

 Industrial Materials Institute, National Research Council Canada, 75, de Mortagne, Boucherville, QC, J4B 6Y4, Canadayouliang.wang@cnrc-nrc.gc.ca

T. W. Coyle

Department of Materials Science and Engineering, Centre for Advanced Coating Technologies, University of Toronto, 184 College Street, Toronto, ON, M5S 3E4, Canadatom.coyle@utoronto.ca

A large pore was defined in the image analysis program as one with a minimum diameter greater than 5μm and an area greater than 25μm2.

J. Fuel Cell Sci. Technol 8(2), 021005 (Nov 29, 2010) (5 pages) doi:10.1115/1.4002583 History: Received February 07, 2009; Revised January 06, 2010; Published November 29, 2010; Online November 29, 2010

The deposition of porous La1xSrxMnO3 (LSM) perovskite cathode materials by conventional plasma spray has been a challenge because of the decomposition of perovskite materials to their suboxides at high temperature. In this paper, the solution precursor plasma spraying (SPPS) process, in which solution precursors of the desired resultant materials are fed into a direct current plasma jet by atomizing gas, was used to simultaneously synthesize LSM perovskite and deposit porous cathode coatings. The experimental results show that process parameters have a significant effect on the fabricated coatings. The perovskite coatings consist of porous agglomerates of small particles with rounded features and local denser regions referred to as thick flakes. The small particles and thick flakes were held together by the previously molten material. There are two kinds of pores in the fabricated coatings: large pores located between the agglomerates and fine pores inside the agglomerates. The porous LSM cathode coatings have 2040area% of desirable homogeneous pores determined by several processing parameters. X-ray diffraction of sintered coatings shows that no suboxides of La1xSrxMnO3 perovskite appear. The results of this project indicate that the SPPS is a potential process to produce high quality cathodes for solid oxide fuel cell application.

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Figures

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Figure 2

Droplet diameter and velocity distributions

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Figure 3

SEM surface morphologies of (a) precursor dominant and (b) half perovskite coatings

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Figure 4

SEM surface morphologies of perovskite coatings: (a) low magnification, (b) high magnification, (c) deposited at higher power, and (d) polished cross section

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Figure 5

SEM of fractured cross section of as-deposited coatings: (a) fractured between particles, (b) fractured by delamination and through particles, and (c) fractured through particles

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Figure 6

XRDs of LSM coatings

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Figure 7

SEM images of sintered coatings: (a) surface, (b) polished cross section, and ((c) and (d)) fractured cross section

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Figure 8

ln (T/R) for LSM cathode coating as a function of reciprocal temperature in air

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