First China-Japan Workshop on Solid Oxide Fuel Cells

Ni–Fe Alloy-Supported Intermediate Temperature SOFCs Using LaGaO3 Electrolyte Film for Quick Startup

[+] Author and Article Information
Tatsumi Ishihara1

Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-Ku, Fukuoka, 819-0395, Japanishihara@cstf.kyushu-u.ac.jp

Jingwang Yan, Makiko Enoki, Sachio Okada, Hiroshige Matsumoto

Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-Ku, Fukuoka, 819-0395, Japan


Corresponding author.

J. Fuel Cell Sci. Technol 5(3), 031205 (May 23, 2008) (3 pages) doi:10.1115/1.2930763 History: Received July 30, 2007; Revised November 29, 2007; Published May 23, 2008

Intermediate temperature solid oxide fuel cells (SOFCs), which are highly tolerant against a thermal cycle, are studied by using the Ni–Fe porous alloy substrate prepared by an in situ reduction. It was found that Ni–Fe alloy exhibits high activity against anodic reaction and suitable compatibility with LaGaO3 electrolyte. The electrolyte film of La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) and Sm0.2Ce0.8O2 (SDC) bilayer with 5μm thickness was successfully prepared on the dense NiOFe2O3 composite anode. After a in situ reduction, the dense plate of NiOFe2O3 was changed to the porous Ni–Fe alloy substrate; however, the LSGM film can keep the dense state. The prepared Ni–Fe alloy that supported LSGM cell demonstrated the maximum power densities of 0.9Wcm2 and 0.4Wcm2 at 873K and 573K. After heating up to 873K within 540s, there is no crack formed on the film and almost the theoretical open circuit voltage was exhibited. In addition, the maximum power density of 400mWcm2 was achieved at 773K. After the thermal cycling, the decrease in the maximum power density was not large, and this suggests that the film is still gas tight and highly tolerant against the thermal cycle. Quick start characteristics of the metal support SOFC could expand the SOFC application to the electric source of a mobile-field-like automobile.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 4

Power generating property of the cell using LSGM∕SDC bilayer film for electrolyte and that of the same cell at 873K after the second time heatup. Thermal cycling used is cooling rate at −100K∕min and heating rate at 100K∕minto873K.

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Figure 3

Programed temperature, actual furnace temperature, and open circuit potential of the cell as a function of time after heating started

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Figure 2

SEM observation results of (a) sintered NiO–Fe2O3 substrate, (b) after H2 reduction at 1173K, and (c) fractured surface of LSGM∕SDC bilayer film on Ni–Fe substrate after reduction

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Figure 1

Anodic overpotential of Ni added with various metal or metal oxides at 873K as a function of current density. Amount of additives was 10wt% to Ni.



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