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Research Papers

Thin Film Solid Oxide Fuel Cells Deposited by Spray Pyrolysis

[+] Author and Article Information
Yongsong Xie1

Institute for Fuel Cell Innovation, National Research Council Canada, 4250 Wesbrook Mall, Vancouver, BC, V6T 1W5, Canadayongsong.xie@nrc.gc.ca

Roberto Neagu, Ching-Shiung Hsu, Xinge Zhang, Cyrille Decès-Petit, Wei Qu, Rob Hui, Sing Yick, Mark Robertson, Radenka Maric, Dave Ghosh

Institute for Fuel Cell Innovation, National Research Council Canada, 4250 Wesbrook Mall, Vancouver, BC, V6T 1W5, Canada

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(2), 021007 (Jan 06, 2010) (6 pages) doi:10.1115/1.3176401 History: Received February 20, 2008; Revised July 10, 2008; Published January 06, 2010; Online January 06, 2010

Two techniques of spray pyrolysis, namely, electrostatic and pneumatic spray deposition, were used to deposit samaria-doped ceria (SDC) electrolyte and lanthanum strontium cobalt ferrite (LSCF) cathode on cermet or metal supported anodes for solid oxide fuel cells (SOFCs) operated at reduced temperature. The deposition processes, the properties of the deposited films, and the electrochemical performances of the fabricated cells are reported in this paper. The deposited SDC electrolytes were dense and gas-tight, and had good adhesion to the underlying anodes. The deposited LSCF cathode had a preferred morphology to facilitate the transport of oxygen gas and effective contact with the electrolyte. Button cell testing indicated that the SOFCs with electrolyte or cathode deposited by spray pyrolysis had good electrochemical performance. This study demonstrated that spray pyrolysis is a cost-effective process for fabricating thin film SOFCs, especially metal supported SOFCs.

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Figures

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Figure 1

Schematic drawing of the spray pyrolysis apparatus

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Figure 2

(a) XRD spectra and (b) average grain sizes of SDC films deposited on stainless steel 430 substrates at 400°C, then thermally treated at higher temperatures for 1 h

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Figure 3

SEM images of polished cross sections of SDC electrolytes deposited (a) on cermet supported NiO-SDC anode by ESD, and (b) on metal supported NiO-SDC anode by PSD (the grooves are the scratches resulted from polishing the samples using diamond particles)

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Figure 4

Current-voltage power curves of button cells with SDC electrolytes deposited on NiO-SDC anodes supported by (a) NiO-YSZ cermet and (b) porous stainless steel 430. The thicknesses of the electrolytes and the deposition processes were about 1 μm by ESD for the cermet supported cell and about 10 μm by PSD for the metal supported cell.

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Figure 5

(a) Schematic of the cell with double layer LSCF cathode, and the SEM images of (b) top surface of the double layer cathode and (c) polished cross section of the cell

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Figure 6

Current-voltage power curves of cells with either single layer or double layer LSCF cathode applied on NiO-YSZ supported NiO-SDC/SDC half-cells

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Figure 7

SEM image of fractured cross section of an LSCF cathode deposited on SDC electrolyte

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