SDC‐SCFZ dual‐phase ceramics: Structure, electrical conductivity, thermal expansion, and O <sub>2</sub> permeability
Claudia Li, Claudia Li, Jian Song, Shude Zhang, Xiaoyao Tan, Xiuxia Meng, Jaka Sunarso, Shaomin Liu
Abstract
Abstract New CO 2 ‐resistant dual‐phase Sm 0.2 Ce 0.8 O 1.925 –SrCo 0.4 Fe 0.55 Zr 0.05 O 3‐δ (SDC‐SCFZ) ceramics present a promising outlook for potential future applications in membrane reactors and solid oxide fuel cells. Their high oxygen permeation flux and stability in CO 2 sweep gas also allow their integration in oxyfuel combustion. Here the structural characteristics, electrical conductivities, thermal expansion behaviors, and oxygen permeabilities of four different SDC‐SCFZ membranes with weight ratios of 10:90, 25:75, 50:50, and 75:25 (SDC:SCFZ) are systematically studied. Among these four SDC‐SCFZ compositions, 0.6 mm‐thick 25 wt% SDC‐75 wt% SCFZ displayed the highest oxygen permeation fluxes that reach 1.26 mL min −1 cm −2 at 950°C and retained its phase integrity under alternating He and CO 2 sweep gas over 72 hours of operation. This composite also showed a moderate thermal expansion coefficient of 1.90 × 10 −5 K −1 between 30°C and 1000°C and an electrical conductivity of at least 16 S cm −1 at 550°C and above. Modeling studies revealed that the oxygen permeation fluxes through 25SDC‐75SCFZ are limited by surface exchange reactions from 700°C to 800°C and mixed bulk diffusion and surface exchange reactions above 800°C.