dc.creator | Martinez, Cristian Fabricio | |
dc.creator | Prado, Fernando Daniel | |
dc.creator | de Florio, Daniel Zanetti | |
dc.creator | Caneiro, Alberto | |
dc.date.accessioned | 2019-10-10T14:44:16Z | |
dc.date.accessioned | 2022-10-14T23:14:36Z | |
dc.date.available | 2019-10-10T14:44:16Z | |
dc.date.available | 2022-10-14T23:14:36Z | |
dc.date.created | 2019-10-10T14:44:16Z | |
dc.date.issued | 2014-02-01 | |
dc.identifier | Martinez, Cristian Fabricio; Prado, Fernando Daniel; de Florio, Daniel Zanetti; Caneiro, Alberto; Stabilization of the cubic perovskite in the system La1-xBa xCo1-yFeyO3-δ (0.7 ≤ x ≤ 0.9) and its electrochemical performance as cathode materials for intermediate-temperature solid oxide fuel cells; Elsevier Science; Journal of Power Sources; 247; 1-2-2014; 264-272 | |
dc.identifier | 0378-7753 | |
dc.identifier | http://hdl.handle.net/11336/85499 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4318219 | |
dc.description.abstract | The effects of the substitution of Co by Fe on the crystal chemistry and electrode reaction of the system La1-xBaxCo 1-yFeyO3-δ (0.7 ≤ x ≤ 0.9), are investigated. The incorporation of Fe stabilizes the cubic perovskite and suppresses the structural transformation of La1-xBa xCoO3-δ from a metastable cubic perovskite to a hexagonal phase below 900 C. The linear expansion decreases with the replacement of Co by Fe. The lowest expansion coefficient value, α ∼ 20.5 × 10-6 K-1, was obtained for the samples with Fe content y = 0.6. AC impedance spectroscopy measurements on symmetrical cells reveal the presence of an intermediate (IF) and a low (LF) frequency contributions at T ≥ 600 C. The LF arc varies with the pO2, at 700 C, according to a power law with exponent n = -1, indicating oxygen diffusion through the porous of the electrode. The minimum Rp value (0.6 cm2 at 600 C) was obtained for La0.3Ba0.7Co0.6Fe 0.4O3-δ. At constant temperature, T = 750 C, only the IF contribution varies at a rate of 3 × 10-4 cm2 h-1, while the LF contribution remains constant. Experimental data suggest the growth of the IF arc is caused by the mismatch in the expansion coefficients of the electrode and electrolyte. | |
dc.language | eng | |
dc.publisher | Elsevier Science | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jpowsour.2013.08.091 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0378775313014419 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | BCFN | |
dc.subject | IMPEDANCE SPECTROSCOPY | |
dc.subject | LBCF | |
dc.subject | OXIDE MIXED CONDUCTORS | |
dc.subject | PHASE RELATIONSHIP | |
dc.subject | THERMAL EXPANSION | |
dc.title | Stabilization of the cubic perovskite in the system La1-xBa xCo1-yFeyO3-δ (0.7 ≤ x ≤ 0.9) and its electrochemical performance as cathode materials for intermediate-temperature solid oxide fuel cells | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |