Excellent and CO$_2$$_{0.85}\(Nd\)_{0.1}\(Cu\)_{0.05}\(O\)_{2-\delta}\(-Nd\)_x\(Sr\)_{1-x}\(Fe\)_{1-y}\(Cu\)_y\(O\)_{3-\delta}$ dual-phase oxygen transport membranes

Oxygen transport membranes(OTMs)have provided great opportunities in the last decades but are suffering from the trade-off effect between stability and oxygen permeability. Here, we report a group of new planar dual-phase mixed ionic-electronic conducting (MIEC) OTMs consisting of CO$_2$$_{0.85}\(Nd...

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Published in:arXiv.org 2024-08
Main Authors: Zhang, Chao, Zhu, Yue, Wang, Xiaopeng, Huang, Yanhao, Zeng, Lingyong, Li, Kuan, Yu, Peifeng, Wang, Kangwang, Li, Longfu, Zaichen Xiang, Chen, Rui, Zhu, Xuefeng, Luo, Huixia
Format: Article
Language:English
Subjects:
Bulk density
Carbon dioxide
Carbon sequestration
Copper
Diffusion
High temperature
Industrial applications
Membranes
Oxygen
Permeability
Permeation
Stability
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Summary:Oxygen transport membranes(OTMs)have provided great opportunities in the last decades but are suffering from the trade-off effect between stability and oxygen permeability. Here, we report a group of new planar dual-phase mixed ionic-electronic conducting (MIEC) OTMs consisting of CO$_2$$_{0.85}\(Nd\)_{0.1}\(Cu\)_{0.05}\(O\)_2\( (CNCO) and Nd\)_x\(Sr\)_{1-x}\(Fe\)_{1-y}\(Cu\)_y\(O\)_3\((NSFCO; \)x = 0.4, 0.6\(; \)y = 0.05, 0.1\() phases, showing excellent oxygen permeability while comparable CO\)_2\(-resistant stability. The substitution of Cu as a bifunctional additive decreases the sintering temperature and enhances bulk diffusion and oxygen permeability with the co-doping of Nd.The oxygen permeation fluxes reached 2.62 and 1.52 mL min\)^{-1}\( cm\)^{-2}\( at 1000\)^\circ\(C through the optimal 60wt%Ce0.85Nd0.1Cu0.05O2-40wt%Nd0.4Sr0.6Fe0.9Cu0.1O3 (CNCO-NSFCO41) composition with He and CO\)_2\( sweeping, respectively, higher than all reported dense dual-phase OTMs. Such excellent CO\)_2$-tolerant permeability meets the needs of potential industrial applications. Analysis with Zhu's oxygen permeation model shows lower bulk diffusion resistance of CNCO-NSFCO41 than that of reported 60wt%Ce0.85Pr0.1Cu0.05O2-40wt%Pr0.4Sr0.6Fe0.9Cu0.1O3(CPCO-PSFCO41)and more limitation by the interfacial exchange at high temperature. All the prepared OTMs also show good long-term stability over 100 hours in both atmospheres. Our results confirm the excellent oxygen permeability and stability under a high-concentration CO2 atmosphere, providing a material candidate for CO2 capture in oxyfuel combustion.
ISSN:2331-8422