BaCe_0.9Er_0.1O_3-α-NaCl-KCl Composite As Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

摘要

In this study, BaCe0.9Er0.1O3-? (BCEr10) powders were synthesized by the microemulsion method usinganhydrous alcohol and PEG as the cosurfactant and surfactant, respectively. BaCe0.9Er0.1O3-?-20wt%NaCl-KCl (BCEr10-NaCl-KCl) composite was also synthesized by heating the BCEr10 with binaryNaCl-KCl. The physical chemistry changes in crystal phase formation and the microstructure of BCEr10were determined by thermal gravimetry analysis-differential scanning calorimetry (TGA-DSC) andtransmission electron microscopy (TEM). The BCEr10 and BCEr10-NaCl-KCl were characterized byXRD and SEM. The results revealed that the dense BCEr10-NaCl-KCl composite electrolyte was formedat a low temperature of 800 oC. The electrical conductivity was calculated from the AC impedance result.The log? ～ log (pO2) plot result indicated that the composite is almost a pure ionic conductor. Finally,the optimum performance of BCEr10-NaCl-KCl was obtained with a highest power density of 413mW·cm-2 at 700 °C.