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Preparation of Doped Lanthanum Gallate Electrolyte for SOFC by Pulsed Laser Deposition

Published online by Cambridge University Press:  01 February 2011

Seiji Kanazawa ,
Takeshi Ito ,
Kenji Yamada ,
Toshikazu Ohkubo ,
Yukiharu Nomoto ,
Tatsumi Ishihara  and
Yusaku Takita
Seiji Kanazawa
Affiliation:
Department of Electrical and Electronic Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Takeshi Ito
Affiliation:
Department of Electrical and Electronic Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Kenji Yamada
Affiliation:
Department of Electrical and Electronic Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Toshikazu Ohkubo
Affiliation:
Department of Electrical and Electronic Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Yukiharu Nomoto
Affiliation:
Department of Electrical and Electronic Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Tatsumi Ishihara
Affiliation:
Department of Applied Chemistry, Oita University, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Yusaku Takita
Affiliation:
Department of Applied Chemistry, Oita University, Oita University, 700 Dannoharu, Oita 870-1192, Japan
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Abstract

In this study, doped lanthanum gallate (LSGM with the composition La0.9Sr0.1Ga0.8Mg0.2O3-δ, LSGMC with the composition La0.8Sr0.2Ga0.8Mg0.15Co0.05O3-δ) films for an electrolyte of the solid oxide fuel cell (SOFC) were prepared by pulsed laser deposition (PLD) technique. In the vacuum chamber, LSGM or LSGMC targets were set on the rotating target holder. A KrF excimer laser was introduced into the chamber at an incident angle of about 45 degree. The doped LaGaO3 film was deposited onto NiO substrates without heating in argon ambient gas. The NiO substrate can be used directly as an electrode in the fabrication of the SOFC. The deposited LSGM films were characterized by X-ray diffraction (XRD), secondary ion mass spectroscopy (SIMS) and scanning electron microscopy (SEM). As-deposited films were amorphous. After post annealing at 1273K for 6-10 hours, crystalline LaGaO3 was obtained. Films with thickness greater than several 10 μm showed an uniform and dense morphology. No gas leakage was found using thick films, which is an important characteristic for an electrolyte in fuel cells. The composition of the deposited films was slightly different to that of the target.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 730: Symposium V – Materials for Energy Storage, Generation, and Transport , 2002 , V5.21
Copyright
Copyright © Materials Research Society 2002

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References

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