Regeneration of materials for a waste free future
Ecole polytechnique fédérale de Lausanne
The prerequisite for electronic waste elimination is a durable active material with this the constant regeneration of the structure under e.g. electrical current, thermochemical and heating cooling cycles.
Electroceramics are indispensable materials for nearly all energy converters (1,2) and very often adopt the versatile perovskite structure.
Perovskite-type ceramics as well as their nanocomposites can be tuned to enable for multifunctional energy converters to reduce the use of critical materials. A good performance relies on their flexible crystal structure being able to accommodate defects during electrical, thermal and chemical redox processes. The design of a regenerative material is based on theoretical models and knowledge on composition-structure-property relationship. The perovskite structure allows diverse substitution reactions to tune the band structure, charge carrier density and mobility as well as thermal and ionic transport.
The electronic mobility can become high while the ionic and thermal conductivity can remain low. Strongly correlated electronic systems are employed as additional design elements for a targeted materials design (3).
Tailored soft chemistry synthesis methods result in nanostructured regenerative oxide materials as well as nitride and chalcogenite phases. These materials are characterized and tested in-situ for e.g. high temperature thermoelectric and catalytic applications to improve the efficiency and energy density of energy conversion devices.
- Universität Stuttgart
Type d'événement: Conférence
Public cible: Professionnel
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