Oxides for fuel cells and dense membranes
Ceramic ion conducting oxides play an important role in developing 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 hence constitute an interesting group of materials for these applications. Our work in this field since we started up more than 25 years ago focusses on an understanding of the electrical properties, cation/anion-diffusion, phase stability and phase relations, thermal expansion behaviour, compatibility with other materials as well as mechanical properties in addition to sustainable synthesis routes. In the early years of the research the main emphasis was on oxide ion conductors but during the last ten years proton conducting oxides have become the most important group of materials for us. The competence built up in the field of oxide ion conductors has laid the fundament for research in other fields of oxide materials; ferroic materials, thermoelectrics as well as oxide LED materials and materials for solar cells.
The main activities include:
- New oxide cathode materials based on double perovskites for proton conducting fuel cells. Contact: Tor Grande.
- Novel synthesis approaches to porous cathode materials for proton conducting fuel cells. Contact: Mari-Ann Einarsrud.
- Structural studies and phase relationships dependant on temperature and oxygen content. Contact Tor Grande.
- Oxygen/proton transport in mixed conductors based on conductivity relaxation as well as membrane permeation techniques. Contact: Kjell Wiik, Tor Grande.
- Stability of barium zirconate in humid and CO2 rich atmospheres. Contact: Tor Grande.
- Cation diffusion in proton conducting oxides. Contact: Tor Grande.
- Self-healing of dense oxygen permeable membranes. Contact: Tor Grande.
- Coatings for metallic interconnects for solid oxide fuel cells. Contact: Hilde Lea Lein.
- Mechanical characterisation (strength, fracture toughness, Young’s modulus, creep) in controlled atmosphere ranging from room temperature to 1100 °C. Contact: Mari-Ann Einarsrud
The cubic unit cell parameter of BSCF and the relative weight change of the BSCF powders as a function of temperature under (a) a N2 atmosphere and (b) an O2 atmosphere.
C. Bernuy-Lopez, K. Høydalsvik, M.-A. Einarsrud and T. Grande
Effect of A-Site Cation Ordering on Chemical Stability, Oxygen Stoichiometry and Electrical Conductivity in Layered LaBaCo2O5+δ Double Perovskite
Materials 9 (2016) 154.
J. Gurauskis, Ø. F. Lohne, D. S. Lagergren, E. T. Wefring and K. Wiik
Oxygen permeation in symmetric and asymmetric La0.2Sr0.2Fe0.8Ta0.2O3 membranes.
J. Eur. Ceram. Soc. 36 (2016) 1427-1434.
M. G. Sahini, J. R. Tolchard, K. Wiik and T. Grande
High temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-δ in different atmospheres
Dalton. Trans. 44 (2015) 10875-10881.
A. K. E. Andersson, S. M. Selbach, T. Grande and C. S. Knee
Thermal evolution of the crystal structure of proton conducting BaCe0.8Y0.2O3-δ from high-resolution neutron diffraction in dry and humid atmosphere
Dalton Trans. 44 (2015) 10834-10846.
X. Chen, M.-A. Einarsrud and T. Grande
Aqueous tape casting and mechanical properties of La2NiO4+δ dense membranes
J. Eur. Ceram. Soc. 35 (2015) 309-315.
V. Gil, J. Gurauskis and M.-A. Einarsrud
Asymmetric supported dense lanthanum tungstate membranes
J. Eur. Ceram. Soc. 34 (2014) 3783-3790.
A. K. E. Andersson, S. M. Selbach, C. S. Knee and T. Grande
Chemical Expansion Due to Hydration of Proton-Conducting Perovskite Oxide Ceramics
J. Am. Ceram. Soc. 97 (2014) 2654–2661.
Ø. F. Lohne, T. N. Phung, T. Grande, H. J. M. Bouwmeester, P. Vang Hendriksen, M. Søgaard and K. Wiik
Oxygen Non-Stoichiometry and Electrical Conductivity of La0.2Sr0.8Fe0.8B0.2O3−δ, B = Fe, Ti, Ta
J. Electrochem. Soc. 161 (2014) F176-F184.
Professor Mari-Ann Einarsrud
Phone: +47 73 59 40 02
Professor Tor Grande
Phone: +47 73 59 40 84
Professor Kjell Wiik
Phone: +47 73 59 40 82
Assoc. Prof. Hilde Lea Lein
Phone: +47 73 55 08 80
Assoc. Prof. Fride Vullum-Bruer
Phone: +47 73 59 39 76
Assoc. Prof. Sverre M. Selbach
Phone: +47 73 59 40 99
Assoc. Prof. Maria Benelmekki
Phone: +47 73 59 40 05
Assoc. Prof. Dennis Meier
Phone: +47 73 59 40 47
Assoc. Prof. Sondre K. Schnell
Phone: +47 45 27 54 63
Sem Sælandsvei 12
Inorganic Chemistry and Ceramics Research Group
att: Mari-Ann Einarsrud
Department of Materials Science and Engineering