Hydrogen permeation properties of Gd 0.1 Ce 0.9 O x /BaCe 0.80 Y 0.20 O 3¹¤ (GDC/BCY) dual-phase membranes were evaluated. Nongalvanic hydrogen permeation was observed for 46 vol % GDC-containing BCY membranes: the permeation rate was 0.30 ml·min ¹1 ·cm ¹2 at 800°C. This is almost comparable to the reported value of NiBCY cermet (0.50 ml·min ¹1 ·cm
¹2). This nongalvanic hydrogen permeation unambiguously indicates that the BCYGDC composite functions as a mixed protonelectron conductor in an H 2 reducing atmosphere. From a conductivity analysis, it was deduced that 46 vol % GDC/BCY possesses proton and electron conductivities comparable to the bulk states of BCY and GDC. The composite membrane was stable in an atmosphere switching between H 2 and air. TGA analysis indicated that addition of GDC enhanced the stability of the BCY phase in CO 2 .
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