Structural and electrical properties of BaCe(Ti,Y)O3 protonic conductors

► Ti and Y dopants modify the crystallographic structure, electrical properties and charge transport mechanism BaCeO3. ► The introduction of Y to the BaCe(Ti)O3 leads to the increase of total and ionic electric conductivity, comparing to the BaCe0.95Ti0.05O3−δ material. ► The changes of protonic and ionic transference numbers with yttrium content may be correlated with the changes of lattice constant, b, and unit cell volume, V, determined from XRD measurements. ► The highest protonic transference numbers were found in the case of sample where the highest unit cell volume for y = 0.10, while the highest total and protonic conductivities were found in the case of sample for y = 0.20.