Mixed conductors
Mixed conductors are materials with a significant fraction of ionic as well as electronic conduction. This mixed conduction allows for the transport of a formally neutral species in a solid (e.g. oxygen in SrTiO3) and is a prerequisite of many kinetic phenomena. Electrode materials (in batteries as well as in solid oxide fuel cells) are typically mixed conductors, and also oxidation catalysts often exhibit electronic as well as ionic conductivity.
Examples of mixed conductors investigated are:
SrTiO3, TiO2,
(La,Ba,Sr)(Mn,Fe,Co)O 3-d, La2CuO4+d,
CeO 2,
Li(Fe,Mn)PO 4
Current Projects:
- Size effects in nanocrystalline SrTiO3
- Interface effects on the electrical conductivity of oxide thin films
- Concentration and mobility of protons in H+-SOFC cathode materials
- Formation and migration of oxygen vacancies in (La,Ba,Sr)(Co,Fe)O3-δ perovskites
- Defect chemistry of alkali peroxides
- Defect chemistry of the LiFePO4/FePO4 redox couple
- Interfacial Li-storage phenomena in nanoporous anatase TiO2 electrodes
- Concentration and mobility of protons in H+-SOFC cathode materials
- Analysis of electrochemical impedance spectroscopy of hybrid perovskite device
- Ion transport and photo-induced phase instability in mixed halide perovskites
- Ionics of layered 2D perovskites
- Nanoionics of hybrid perovskite interfaces