“…Mixed ionic and electronic conduction (MIEC) is widely investigated for intermediate-temperature solid oxide fuel cell (SOFC) cathodes [1] , [2] , [3] and there is also strongly growing interest in applying reduction stable MIECs as SOFC anodes [4] , [5] , [6] , [7] , [8] , [9] , [10] . Studies on some perovskite-type porous anodes demonstrated low area specific resistance and high stability for redox cycling [4] , [5] , [6] , [7] . For ceria-based anode materials also mechanistic investigations on geometrically well-defined thin films have been performed [8] , [9] , [10] .…”