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Title

Development by Mechanochemistry of La0.8Sr0.2Ga0.8Mg0.2O2.8 Electrolyte for SOFCs

AuthorsGarcía-García, Francisco J. ; Tang, Yunqing; Gotor, F.J. ; Sayagués, María Jesús
KeywordsSOFC
Mechanochemistry
LSGM
Electrolyte
Perovskite
Ionic conductivity
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMaterials, 13: 1366 (2020)
AbstractIn this work, a mechanochemical process using high-energy milling conditions was employed to synthesize La0.8Sr0.2Ga0.8Mg0.2O3- (LSGM) powders from the corresponding stoichiometric amounts of La2O3, SrO, Ga2O3, and MgO in a short time. After 60 min of milling, the desired final product was obtained without the need for any subsequent annealing treatment. A half solid oxide fuel cell (SOFC) was then developed using LSGM as an electrolyte and La0.8Sr0.2MnO3 (LSM) as an electrode, both obtained by mechanochemistry. The characterization by X-ray di raction of as-prepared powders showed that LSGM and LSM present a perovskite structure and pseudo-cubic symmetry. The thermal and chemical stability between the electrolyte (LSGM) and the electrode (LSM) were analyzed by dynamic X-ray di raction as a function of temperature. The electrolyte (LSGM) is thermally stable up to 800 and from 900 C, where the secondary phases of LaSrGa3O7 and LaSrGaO4 appear. The best sintering temperature for the electrolyte is 1400 C, since at this temperature, LaSrGaO4 disappears and the percentage of LaSrGa3O7 is minimized. The electrolyte is chemically compatible with the electrode up to 800 C. The powder sample of the electrolyte (LSGM) at 1400 C observed by HRTEM indicates that the cubic symmetry Pm-3m is preserved. The SOFC was constructed using the brush-painting technique; the electrode–electrolyte interface characterized by SEM presented good adhesion at 800 C. The electrical properties of the electrolyte and the half-cell were analyzed by complex impedance spectroscopy. It was found that LSGM is a good candidate to be used as an electrolyte in SOFC, with an Ea value of 0.9 eV, and the LSM sample is a good candidate to be used as cathode.
Publisher version (URL)https://doi.org/10.3390/ma13061366
URIhttp://hdl.handle.net/10261/207269
DOI10.3390/ma13061366
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