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Charge transfer mechanisms in the solid

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Ionic (or mixed) conductive ceramics find applications in systems for energy generation or storage : solid oxide fuel cells (SOFC), batteries, etc… We explore how our materials can bring interesting properties for such applications, by using characterization methods such as impedance spectrometry.

We are also involved in European projects which deal with ceramic conductive membranes for energy or green chemistry applications : in this particular application, the membrane is in charge of supplying a high purity gas (for example oxygen) to a chemical reaction (combustion or other) : the microstructure and ionic conductivity of the conductive ceramic material is key for a high gas flux and good selectivity.

  


Apart from these classical applications of conductive ceramics, we also work on the application of conductive ceramics as catalyst support in environmental catalysis (oxidation of VOCs and CO, reduction of NOx): indeed, several studies show that depositing catalyst nanoparticles on an ionic-conductive support can increase the catalytic performance compared to a classical support. We are especially interested in studying the interaction of the catalyst and the support material, e.g. by looking at lattice oxygen participation in oxidation reactions or storage of gaseous reactants in the support lattice. In order to understand the role of the support, we study our materials in collaboration with other research institutes under operando conditions (IR, Raman and EXAFS). The microstructure and properties of the catalyst and catalyst support are investigated by several methods, which are available in our facilities (X-Ray diffraction, nitrogen adsorption, electron microscopy, temperature-programmed desorption, measurement of catalytic conversion and selectivity for model reactions.)