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Conducteurs protoniques hybrides.

Abstract : Devices such as fuel cells require the use of materials that allow proton conduction even at low relative humidities. The present work proposes the synthesis of new proton conductors by reaction of colloidal zirconium oxide with organically modified phosphates and phosphonates. Accurate NMR spectroscopy studies allowed to determine the distribution of protons among water and acidic sites grafted onto the zirconia surface. Macroscopic conductivity measurements demonstrate that the limiting step is the intergranular protonic transport. However, Nuclear Magnetic relaxation studies (T1, T2) and relaxometry allowed to study the proton diffusion mechanisms which are of vehicular type under hydrated conditions (simply H3O+ diffusion) and of Grothus-type in anhydrous conditions, associated to H+ hopping between adjacent basic sites built with grafted molecules.
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Submitted on : Thursday, July 29, 2010 - 3:38:09 PM
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Lauriane Pautrot-d'Alencon. Conducteurs protoniques hybrides.. Science des matériaux [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2006. Français. ⟨pastel-00002179⟩

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