Triple ionic-electronic conductors (TIEC) such BaCo0.4Fe0.4Zr0.1Y0.1O3-δ  (BCFZY) have received much attention as high performance electrode materials for protonic ceramic fuel cells (PCFC). The conduction of all three species makes TIECs excellent candidates as cathodes in PCFCs due to their high activity, good stability, and facile synthesis routes. The bulk characteristics of oxygen and proton diffusion along with surface exchange characteristics were determined for the triple-conducting BaCo0.4Fe0.4Zr0.2−XYXO3−δ suite of samples with varying Y composition. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. In this work on BCFZY based TIEC materials, a combination of DC four-point conductivity for electronic carriers and gas permeation (oxygen and proton transport) for ionic carriers has recently been utilized to fully compare transport across varying material compositions and atmospheric conditions.