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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
Doped ceria-carbonate composite is considered as a promising electrolyte for intermediate temperature solid oxide fuel cells. H+ conduction in the composite has attracted much attention in recent years, while its mechanism has not been revealed clearly. In this work, H+ conductivities of samarium doped ceria-carbonate composites with varying composition are measured by a four-probe direct current method. For composites with aggregated carbonate phase, H+ conductivity increases with the rise of carbonate content, while for composites with a more homogeneous distribution of phases, a larger interfacial region means higher H+ conductivity. We propose that H+ conducts through both the molten carbonate phase and the interfacial region. H+ conduction at the interface is influenced by the composition of the ceramic phase.