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Specific considerations for obtaining appropriate La(1-x)Sr(x)Ga(1-y)MgyO(3-delta) thin films using pulsed-laser deposition and its influence on the performance of solid-oxide fuel cells

Authors
Hwang, JaeyeonLee, HeonLee, Jong-HoYoon, Kyung JoongKim, HyoungchulHong, JongsupSon, Ji Won
Issue Date
15-1월-2015
Publisher
ELSEVIER SCIENCE BV
Keywords
Sr- and Mg-doped LaGaO3; Thin-film electrolyte; Pulsed-laser deposition; Solid-oxide fuel cell; Composition transfer
Citation
JOURNAL OF POWER SOURCES, v.274, pp.41 - 47
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
274
Start Page
41
End Page
47
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/94640
DOI
10.1016/j.jpowsour.2014.10.023
ISSN
0378-7753
Abstract
To obtain La1-xSrxGa1-yMgyO3-delta (LSGM) thin films with the appropriate properties, pulsed-laser deposition (PLO) is employed, and specific considerations regarding control of the deposition parameters is investigated. It is demonstrated that with a target of stoichiometric composition, appropriate LSGM thin films cannot be produced because of the deviation of the composition from the target to the thin film. Only after adjusting the target composition an ISGM thin film with an appropriate composition and phase can be obtained. The optimized LSGM thin film possesses an electrical conductivity close to that of the bulk LSGM. In contrast, non-optimized thin films do not yield any measurable electrical conductivity. The impact of the optimization of the LSGM thin-film electrolyte on the cell performance is quite significant, in that a solid-oxide fuel cell (SOFC) with an optimized LSGM thin-film electrolyte produces a maximum power density of 1.1 W cm(-2) at 600 degrees C, whereas an SOFC with a non-optimal LSGM thin-film electrolyte is not operable. (C) 2014 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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