Validation of H+/O2− conduction in doped ceria–carbonate composite material using an electrochemical pumping method

A hydrogen and oxygen electrochemical pump technique has been employed to elucidate the conduction of proton and oxygen ion in a doped ceria–carbonate composite electrolyte for intermediate temperature solid oxide fuel cells. The composite material shows efficient conductivities of both of the two ions at 650 °C. The molten carbonate phase is important for the migration of both of the two ions. The mechanism of the conduction of proton and oxygen ion is also discussed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The gas electrochemical pumps are used to study the conductions of H+ and O2−. ► H+ and O2− conductions in the ceria–carbonate electrolyte are proved. ► The effects of the carbonate content and the operating temperature are examined. ► The conduction mechanisms of H+ and O2−are proposed.