Proton uptake in the mixed ionic and electronic conductors Ba1-xSrxFeO3-d

Cathode materials for proton-conducting ceramic fuel cells (PCFC) should combine electronic conductivity with adequate proton conductivity and thereby extend the water formation process from the triple phase boundary to the entire surface of the porous cathode. A variety of such materials including perovskite-structured Ba0.95La0.05FeO3 has been studied experimentally with regard to proton uptake, revealing a systematically lower proton concentration than in electrolyte materials and a peculiar interaction between electronic charge carriers (i.e. holes) and ionic charge carriers (i.e. protons). [1] Please click Additional Files below to see the full abstract