The nanocomposite electrolytes composed of Sm0.2Ce0.8O1.9 (SDC) nanorods enclosed by {110} and {100} facets and a binary carbonate ((Li0.52Na0.48)2CO3, LNC) were prepared by a wet mixing method to investigate the conduction mechanism. The X-ray diffraction (XRD), scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques were em-ployed to characterize the phase components and microstructures of SDC nanorods and SDC nanorods/LNC composite electrolytes. X-ray powder diffraction showed that a well-cubic fluorite structure was formed. The AC impedance spectroscopy and DC polariza-tion method were used to measure the electrical conductivities of nanocomposite electrolytes under different conditions. The overall ionic conductivities of nanocomposite electrolytes in the air and hydrogen atmospheres were measured up to 82 and 96 mS/cm at 650 oC, respectively. Additionally, the protonic and oxide ionic conductivities of nanocomposite electrolytes were found to reach 20 and 18 mS/cm at 650 oC, respectively. The conduction mechanism was discussed in detail by comparing the conductivities of nanocom-posite electrolytes. The protonic conductivity of SDC nanorods/LNC nanocomposite was higher than oxide ionic conductivity. The melt of LNC and the interface layer may make a dominant contribution to oxide ions and protonic conductivity in air and hydrogen atmosphere, respectively.
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