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Oxides for Energy Technology
Ceramic ion conducting oxides play an important role in developing new energy technologies like membrane technology and fuel cells. A large number of oxides with e.g. perovskite related structures do exhibit both electronic and ionic (oxygen ion or protons) conductivity at elevated temperatures and are hence promising candidates for applications such as electrodes in electrochemical cells, membrane materials for gas separation, production of syngas and simple devices for measuring oxygen partial pressures. A proper utilisation of these materials presupposes a thorough understanding of a large number of properties embracing electrical properties, cation/anion-diffusion, phase stability and phase relations, thermal expansion behaviour, compatibility with other materials as well as mechanical properties at both low and elevated temperatures.
There has been a steady increase in research related to oxide materials for energy technology in our group, and investigations in this field constitute a significant part of the total research activities.
The main activities include:
Preparation of ceramic oxide materials with designed micro- or nanostructure.
Ceramic processing of demonstrators and prototypes by tape casting, spray coating, etc.
Development of new mixed conducting materials.
Structural studies and phase relationships with temperature and oxygen content.
Oxygen transport in mixed conductors based on conductivity relaxation as well as membrane permeation techniques.
Cation diffusion.
Mechanical characterisation (strength, fracture toughness, Youngs modulus, creep) in controlled atmosphere ranging from room temperature to 1100°C.
Thermodynamics of perovskite materials.
Chemical compatibility studies: Interdiffusion and reactions at interface between perovskites and candidate electrolyte and sealing (glass) materials.
Assessment of fundamental thermodynamic data by high temperature solution calorimetry.
Tape caster
Hot pressed LaNbO4 with an
average grain size of 400 nm.
Please note that these pages are under devolpoment
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