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Research Papers

Influence of Different Aspects of the SOFC Anode Environment on the Oxidation Behavior of Porous Samples Made of Crofer

[+] Author and Article Information
I. Antepara1

Ikerlan-Energía, Parque Tecnológico de Álava, Juan de La Cierva 1, E-01510 Miñano, Álava, Spainiantepara@ikerlan.es

M. Rivas, I. Villarreal

Ikerlan-Energía, Parque Tecnológico de Álava, Juan de La Cierva 1, E-01510 Miñano, Álava, Spain

N. Burgos, F. Castro

 Department of CEIT Materials, P. de Manuel Lardizabal 15, E-20018 San Sebastian, Spain

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(6), 061010 (Aug 24, 2010) (7 pages) doi:10.1115/1.4001764 History: Received February 18, 2010; Revised February 24, 2010; Published August 24, 2010; Online August 24, 2010

Crofer can be considered as the reference interconnect material in solid oxide fuel cells (SOFCs) working under 800°C. Thanks to its thermal expansion coefficient, it is suitable to replace ceramic components, such as the interconnect and the metal support, and it can be cost effective. Several research groups, including Ikerlan, have used porous substrates with the same composition as Crofer (PM from H.C. Starck GmbH, Goslar, Germany) as the metal support for their SOFC cells. The aim of this study is to determine the effect of certain variables (time, temperature, vapor content, cycling, porosity, and current flow), while other aspects are constant (sample composition and particle size and shape).

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mass gains after 2 h, 24 h, and 72 h at 600°C, 700°C, and 800°C. In addition, 3 cycles of 8 h and 24 h in H2%–3%H2O at 800°C.

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Figure 2

SEM images for samples oxidized at 800°C for 72 h with (a) 3% of vapor and (b) 70% of vapor

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Figure 3

XRD patterns for samples oxidized at 600°C, 700°C, and 800°C for 2 h, 24 h, and 72 h with vapor contents of (a) 25% and (b) 50%

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Figure 4

Mass gains of the porous samples after 72 h in H2 with vapor contents of 3%, 7%, 25%, 50%, and 70%. (a) referred to the initial mass and (b) referred to the surface area measured by Hg porosimetry before oxidation

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Figure 5

Mass gains after 2 h, 24 h, and 72 h at 600°C, 700°C, and 800°C in H2/H2O atmospheres (ratios 1 and 3) diluted in Ar

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Figure 6

SEM images of the surface of three nonoxidized samples (a) consolidated at high temperature in hydrogen (70% porosity), (b) 20% of shrinkage, and (c) 25% of shrinkage (∼30% porosity)

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Figure 7

SEM images for samples oxidized at 800°C in H2/H2O=1 for 70 h (a) consolidated at high temperature in hydrogen (70% porosity) and (b) 25% of shrinkage (∼30% porosity)

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Figure 8

SEM images for samples oxidized at 800°C in H2/H2O=1 for 70 h with current flows of (a) 0 mA/cm2 and (b) 800 mA/cm2

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