Electrochemistry of mixed ionic-electronic conductors and solid electrolytes, modelling of ionic transport and defect formation processes, development of novel measurement methods for ionically- and mixed-conducting solids, high-temperature electrochemistry and chemistry of oxide materials, solid oxide fuel cells, ceramic membranes, oxygen and hydrogen separation, high-temperature electrocatalytic processes for natural gas and biogas conversion, nanostructured oxide and cermet materials, glass-ceramic sealants for electrochemical applications.