Localization of interstitial oxygen atoms in novel layered solid electrolytes with K2NiF4 structures, and study of its thermal evolution
Whereas most of solid electrolytes utilized in solid-oxide fuel cells (SOFC) commonly conduct oxide ions by a vacancy mechanism (e.g YSZ, GDC, LSGM…), it has been recently demonstrated that the activation energy of O2- motion is lower for an interstitial mechanism in layered perovskites derived from LaSrInO4. These oxides exhibit the capability of inserting large amounts of oxygen interstitials. We have recently prepared novel electrolytes of composition Bi0.2La0.8SrInO4+delta and Bi0.2La0.9Sr0.9InO4+delta, where the presence of large Bi3+ ions expands the unit cell and improves the mobility of interstitial oxygens. Ionic conductivity in Bi0.2La0.8SrInO4 is higher by an order of magnitude, with a lower activation energy, compared with the pristine LaSrInO4 sample. In this experiment we aim to correlate the good performance of such materials with the structural features and to follow “in situ” their thermal evolution, unveiling, in particular, the influence of Bi3+ on the O contents, thermal displacements and evolution at the actual working conditions of the electrolyte in a SOFC.
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ALONSO Jose Antonio; CASCOS JIMENEZ Vanessa Amelia; FERNANDEZ DIAZ Maria Teresa; SERRANO Federico and TRONCOSO Loreto. (2016). Localization of interstitial oxygen atoms in novel layered solid electrolytes with K2NiF4 structures, and study of its thermal evolution. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-578
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