|
|||||
|
|
SDC-SCFZ dual-phase ceramics: Structure,electrical conductivity,thermal expansion,and O2 permeability |
|
| Authors: | Claudia Li Jian Song Shude Zhang Xiaoyao Tan Xiuxia Meng Jaka Sunarso Shaomin Liu |
| Affiliation: | 1. Research Centre for Sustainable Technologies, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, Kuching, Sarawak, Malaysia;2. State Key Laboratory of Separation Membranes and Membrane Processes, Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin, China School of Chemical Engineering, Shandong University of Technology, Zibo, China;3. School of Chemical Engineering, Shandong University of Technology, Zibo, China;4. State Key Laboratory of Separation Membranes and Membrane Processes, Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin, China;5. Department of Chemical Engineering, Curtin University, Perth, WA, Australia College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China |
| Abstract: | New CO2-resistant dual-phase Sm0.2Ce0.8O1.925–SrCo0.4Fe0.55Zr0.05O3-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 CO2 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 CO2 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. |
| Keywords: | carbon dioxide resistance conductivity dual-phase oxygen permeation stability |