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Synthèse et mise en forme de nouveaux matériaux de cathode pour piles ITSOFC : réalisation et tests de cellules

Abstract : The development of the Solid Oxide Fuel Cells is dependent on the reduction of the cathodic overpotential measured at 600-700°C. In this way, in the last few years, we have made a selection from new cathode materials in the Institute; the oxygen over-stoichiometric oxides formulated A2MO4+δ (K2NiF4-type structure), show enhanced electrocatalytic and oxygen conduction properties. A detailed study was performed on the compositions Nd2-xNiO4+δ (x = 0 and 0.05): the oxygen reduction was characterised by impedance spectroscopy and voltametry measurements (symmetrical configuration cell under air).
Electrochemical analysis carried out under different oxygen partial pressures and various cathodic overpotentials had led to identify the various contributions of the mechanism of the dioxygen reduction. Using powders with controlled morphology (coming from different synthesis ways) results in a reduction of the electrode polarisation phenomena, the limiting step of the process still remaining the interface cathode / electrolyte ionic transfer.
In addition, due to these promising results (low area specific resistances and minimized cathodic overpotentials), the first tests in a complete fuel cell device were achieved. After an optimisation of the shaping parameters, i.e. selection of the suitable coating
process and of the sintering thermal cycle, current densities of 1,3 A/cm2, at 0,7 V have been measured at 800°C, the operating temperature.
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Submitted on : Monday, September 11, 2006 - 4:59:09 PM
Last modification on : Thursday, January 11, 2018 - 6:15:09 AM
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  • HAL Id : tel-00092666, version 1



Cécile Lalanne. Synthèse et mise en forme de nouveaux matériaux de cathode pour piles ITSOFC : réalisation et tests de cellules. Matériaux. Université Sciences et Technologies - Bordeaux I, 2005. Français. ⟨tel-00092666⟩



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