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Caldes, M. T., Kravchyk, K. V., Benamira, M., Besnard, N., Gunes, V., Bohnke, O. & Joubert, O. (2012) Metallic Nanoparticles and Proton Conductivity: Improving Proton Conductivity of BaCe0.9Y0.1O3-delta Using a Catalytic Approach. Chem. Mat. 24 4641–4646.
Added by: Laurent Cournède (2016-03-10 21:28:37) |
| Type de référence: Article DOI: 10.1021/cm301685x Numéro d'identification (ISBN etc.): 0897-4756 Clé BibTeX: Caldes2012 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: bcy, Hebb-Wagner ion blocking method, Ni exsolution, proton conductivity, protonic ceramic fuel cells Créateurs: Benamira, Besnard, Bohnke, Caldes, Gunes, Joubert, Kravchyk Collection: Chem. Mat. |
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In this work, we have used nickel nanoparticles to improve proton conductivity of the electrolyte BaCe0.9Y0.1O3-delta (BCY). Ni nanoparticles were dissolved into the compounds as their oxidized form (BaCe0.9-xY0.1NixO3-delta) and precipitated upon heating under a reducing atmosphere. Below 700 degrees C, proton conductivity is enhanced under a reducing atmosphere. An increase of 1 order of magnitude, with respect to BCY, was observed for BaCe0.7Y0.1Ni0.2O3-delta (1.7 x 10(-2) S/cm at 500 degrees C). This phenomenon is more pronounced for the compounds containing more nickel on the surface, which can facilitate the dissociation of hydrogen and the incorporation of protons in the structure. Under reducing atmosphere, nickel doping enhances both bulk and grain boundaries conductivities and the blocking effect appear at lower temperature.
Added by: Laurent Cournède |