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Caldes, M. T., Kravchyk, K. V., Benamira, M., Besnard, N., Joubert, O., Bohnke, O., Gunes, V., Jarry, A. & Dupre, N. (2012) Metallic Nanoparticles and Proton Conductivity: Improving Proton Conductivity of BaCe0.9Y0.1O3-delta and La0.75Sr0.25Cr0.5Mn0.5O3-delta by Ni-doping. Mogensen, M. B., Gur, T. M., Zhou, X. D., Armstrong, T. & Yokokawa, H. (Eds.), Ionic and Mixed Conducting Ceramics 8 Pennington.
Added by: Laurent Cournède (2016-03-10 21:28:40) |
| Type de référence: Chapitre/Section Numéro d'identification (ISBN etc.): 978-1-60768-311-7 Clé BibTeX: Caldes2012a Voir tous les détails bibliographiques  |
Catégories: ST2E Créateurs: Armstrong, Benamira, Besnard, Bohnke, Caldes, Dupre, Gunes, Gur, Jarry, Joubert, Kravchyk, Mogensen, Yokokawa, Zhou Éditeur: Electrochemical Soc Inc (Pennington) Collection: Ionic and {Mixed} {Conducting} {Ceramics} 8 |
Consultations : 1/574
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In this work we have used metallic nanoparticles to improve proton conductivity of the ceramic electrolyte BaCe0.9Y0.1O3-delta (BCY) and of the electrode material La0.75Sr0.25Cr0.5Mn0.5O3-delta (LSCM). Instead of adding metallic nanoparticles as a separate phase, they were dissolved in the compounds as their oxidized form (Ni2+). The metal nanoparticles precipitated from compounds upon heating under reducing atmosphere. Below 600 degrees C under reducing atmosphere, BaCe0.9-xY0.1NixO3-delta compounds exhibit higher conductivity than BCY. Thus, an increase of one order of magnitude was observed for BaCe0.7Y0.1Ni0.2O3-delta. A protonic contribution to the total conductivity is observed below 600 degrees C. This phenomenon is more pronounced for the compounds containing more nickel in surface which can facilitate the dissociation of hydrogen and the incorporation of protons in the structure. La0.75Sr0.25Cr0.5Mn0.5-xNixO3-delta compounds show also a protonic contribution to the total conductivity below 400 degrees C. NMR results confirmed that these compounds contain protons.
Added by: Laurent Cournède |