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China-Japan Workshop on Solid Oxide Fuel Cells

Development and Characterization of Cathode-Supported SOFCs by Single-Step Cofiring Fabrication for Intermediate Temperature Operation

[+] Author and Article Information
Yu Liu1

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japanyuliu@mail.sic.ac.cn

Shin-ichi Hashimoto, Katsuhito Takei, Masashi Mori

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan

Yoshihiro Funahashi

 Fine Ceramics Research Association, 2266-99 Anagahora, Shimo-shidami, Moriyama-ku, Nagoya, Aichi 463-8561, Japan

1

Corresponding author. Present address: Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 DingXi Road, Shanghai 200050, P.R.C.

J. Fuel Cell Sci. Technol 5(3), 031209 (May 27, 2008) (5 pages) doi:10.1115/1.2930767 History: Received August 09, 2007; Revised December 11, 2007; Published May 27, 2008

In this study, a single-step cofiring through the extrusion molding and wet-ceramic coating technique was developed to fabricate a cathode-supported microtubular cell. The cell is consisting of a Ce0.9Gd0.1O1.95 (GDC) electrolyte with a NiO–GDC anode on a porous La0.6Sr0.4Co0.2Fe0.8O3δ∕GDC tube (460μm wall thickness and 2.26mm diameter). Densification of the ceria membrane (thickness <20μm) was successful by cosintering the laminated thin electrolyte and the anode with the cathode at 1200°C. Compared with that fabricated by the conventional two-step cofiring process, the cell showed an improved performance due to the increased anode sintering temperature, which leads to an improved anode∕electrolyte interfacial property. The cell having 2cm tube length fed with humidified 30vol%H2Ar (3% H2O) produced the maximum power densities of 0.09Wcm2, 0.08Wcm2, and 0.05Wcm2, at 600°C, 550°C, and 500°C, respectively.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Linear shrinkage of the NiO–GDC composites (Ni:GDC=50:50 volume after reduction); the shrinkage of electrolyte was given as comparison. The NiO powders with surface areas of 4m2g−1, 8m2g−1, and 12m2g−1 were named as Ni4, Ni8, and Ni12, whereas GDC powders in 10m2g−1, 20m2g−1, and 39m2g−1 were defined as GDC10, GDC20, and GDC39, respectively

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Figure 2

(a) XRD patterns of the NiO–GDC composite (Ni:GDC=50:50 volume after reduction) prepared by the citrate method. As comparison, XRD pattern of the GDC powders synthesized by the same method was given in (b)

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Figure 3

Comparison in the linear shrinkage and relative density of the NiO–GDC composite prepared by citrate method and mechanical mixing (Ni:GDC=50:50 volume after reduction)

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Figure 4

BSE-SEM micrograph of (a) NiO–GDC prepared by citrate method, and (b) the mechanically mixed NiO (4m2g−1)–GDC(10m2g−1). Both samples were sintered at 1400°C for 10h (Ni:GDC=50:50 volume after reduction)

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Figure 5

SEM micrographs of the cross section of (a) the as-prepared cell, and (b) the enlarged view of cathode∕electrolyte∕anode section (before reduction)

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Figure 6

Current-voltage and power density characteristics of the cells prepared by (a) the normal two-step cofiring and (b) the single-step cofiring (oxidant in cathode: air)

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Figure 7

Current-voltage and power density characteristics of the single-step cofiring fabricated cell (oxidant in cathode: oxygen)

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