Proton Conduction in Sintered Oxides Based on BaCeO3

Abstract

Some sintered oxides based on BaCeO3 were found to exhibit appreciable proton conduction under hydrogen= containing atmosphere at high temperature. The verification of proton conduction was made by studying the EMF of various gas cells using the specimen ceramics as the solid electrolyte. The protonic conductivity in the Nd203 doped BaCeO3 was higher than that in the SrCeO3-based proton conductor found previously by us. These materials could be applied to the solid electrolyte for a hydrogen fuel cell, a hydrogen pump, and a steam electrolyzer to produce hydrogen.

Electrophoretic deposition of dense BaCe0.9Y0.1O3−x electrolyte thick-films on Ni-based anodes for intermediate temperature solid oxide fuel cells

“…While the relatively low value of R pol shows good electrodes performances, the high value of R ohm shows the existence of undesired ohmic losses in the cell. Based on the BCY10 protonic conductivity of ∼0.01 S cm −1 at 650 • C [34], the ohmic resistance of the 13.4 m thick film is estimated to be ∼0.13 cm 2 . The large difference in ohmic resistance (∼0.86 cm 2 ) is probably due to the additional contact resistance at the LSCF-YbBC/BCY interface and the Ni-BCY/BCY interface as well as that at the electrodes and current collector interface.…”

Correlation between Thermal Properties, Electrical Conductivity, and Crystal Structure in the BaCe0.80Y0.20O2.9 Proton Conductor

“…With the progress in the synthesis and characterization of the newly discovered materials, such as the BaCeO 3 and CaZrO 3 perovskites, an intense research has also been devoted to the comprehension of the defect chemistry of the same materials, in order to optimize their performance and build the basis for the development of other solid-state proton conductors [10][11][12][13][14][15] (1) with oxygen vacancies constituting the site for the incorporation of water in the form of hydroxyl groups through:…”

Defect chemistry and transport properties of BaxCe0.85M0.15O3-δ

“…1,2 More recently, high proton conductivity has been established in doped A 2+ B 4+ O 3 perovskites such as BaCeO 3 , SrCeO 3, and SrZrO 3 . [3][4][5][6] The particularly high conductivity of rare-earth (or yttrium) doped BaCeO 3 has led to extensive studies of its applicability as an electrolyte for reduced-temperature solid-oxide fuel cells and for hydrogen sensors. 7,8 Proton incorporation in BaCeO 3 has been generally recognized to occur by two steps: …”