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In this study, BaCe0.9Er0.1O3−α was synthesized by a microemulsion method. Then, a BaCe0.9Er0.1O3−α–K2SO4–BaSO4 composite electrolyte was obtained by compounding it with a K2SO4–Li2SO4 solid solution. BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrometry. AC impedance spectroscopy was measured in a nitrogen atmosphere at 400–700 °C. The logσ~log (pO2) curves and fuel cell performances of BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were tested at 700 °C. The maximum output power density of BaCe0.9Er0.1O3−α–K2SO4–BaSO4 was 115.9 mW·cm−2 at 700 °C, which is ten times higher than that of BaCe0.9Er0.1O3−α. [ABSTRACT FROM AUTHOR]

BaCe0.9Yb0.1O3−α was prepared via the sol-gel method using zirconium nitrate, ytterbium trioxide, cerium nitrate and barium acetate as raw materials. Subsequently, it reacted with the binary NaCl~KCl salt to obtain BaCe0.9Yb0.1O3−α-NaCl~KCl composite electrolyte. The structure, morphology, conductivity and fuel cell performance of the obtained samples were investigated. Scanning electron microscope (SEM) images showed that BaCe0.9Yb0.1O3−α and NaCl~KCl combined with each other to form a homogeneous 3-D reticulated structure. The highest power density and conductivity of BaCe0.9Yb0.1O3−α-NaCl~KCl was 393 mW·cm−2 and 3.0 × 10−1 S·cm−1 at 700 °C, respectively. [ABSTRACT FROM AUTHOR]

Abstract A SrCe 0.6 Zr 0.3 Lu 0.1 O 3-α electrolyte was synthesized via a citric-nitrate auto-combustion (CNA) method using Sr(NO 3) 2 , Zr(NO 3) 4 ·5H 2 O, (NH 4) 2 Ce(NO 3) 6 , Lu 2 O 3 , HNO 3 and citric acid as raw materials. Subsequently, it reacted with the molten carbonate salt to obtain the SrCe 0.6 Zr 0.3 Lu 0.1 O 3-α -Li 2 CO 3 -Na 2 CO 3 composite electrolyte. The morphology, structure, conductivity and fuel cell performance of the obtained samples were investigated. SrCe 0.6 Zr 0.3 Lu 0.1 O 3-α is fully dense after calcinated at 1540 °C for 5 h SrCe 0.6 Zr 0.3 Lu 0.1 O 3-α and Li 2 CO 3 -Na 2 CO 3 combined with each other to form a homogeneous interconnected structure. The highest power density and conductivity of SrCe 0.6 Zr 0.3 Lu 0.1 O 3-α -Li 2 CO 3 -Na 2 CO 3 are 255 mW cm−2 and 8.6 × 10−2 S cm−1 at 600 °C, respectively. [ABSTRACT FROM AUTHOR]

Abstract In this paper, a 4 mol% MgO doped Zr 0.92 Y 0.08 O 2-α (8YSZ) and its composite electrolyte of 8YSZ + 4MgO-NaCl/KCl were synthesized via a solid state reaction method. The morphology, structure and intermediate temperature electrochemical properties of the obtained samples were investigated. The log σ ～ log (p O 2) and log (σT) ～ 1000 T−1 Arrhenius plots of the 8YSZ+ 4MgO and 8YSZ + 4MgO-NaCl/KCl were performed. Oxygen concentration discharge cells were measured in order to determine the oxide ionic conduction in the samples. Finally, H 2 /O 2 fuel cell using the 8YSZ + 4MgO-NaCl/KCl as electrolyte obtained the highest power density of 444 mW cm−2 at 700 °C. [ABSTRACT FROM AUTHOR]