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RESEARCH ARTICLE|2 Article(s)
Qifan ZHENG, Chaoqun LI, Xiaokuan BAN, Zhongliang ZHAN, and Chusheng CHEN
The dense ceramic oxygen-permeable membrane has attracted much attention due to its potential applications in production of oxygen from air and manipulation of oxygen-consuming industrial chemical processes. In the present study, Gd0.1Ce0.9O2-δ-La0.6Sr0.4FeO3-δ (GDC-LSF) dual-phase composite membrane was prepared using the phase-inversion tape casting/lamination/sintering method. The as-prepared membrane consisted of an 80 μm thick dense oxygen separation layer sandwiched between two 420 μm thick finger-like porous support layers. The inner surface of the support layers was further modified with Nd2NiO4+δ (NNO) nanoparticles using the impregnation method. An oxygen permeation flux of 1.53 mL·cm-2·min-1 was measured at 900 ℃ by exposing one side of the membrane to a flowing air stream and the other side to a flowing He stream. When CO2 was used as sweep gas, an oxygen permeation flux of 0.6 mL·cm-2·min-1 was obtained, and no decrease in the flux was observed during 90 h of testing. The membrane remained intact after experiencing over 70 thermal cycles between 800 and 900 ℃. GDC-LSF dual-phase composite membrane with straight pores and sandwich structure has demonstrated satisfactory combination of oxygen permeability, chemical stability and thermal mechanical strength, promising for applications in separation of oxygen from air and oxy-fuel combustion with CO2 capture. The dense ceramic oxygen-permeable membrane has attracted much attention due to its potential applications in production of oxygen from air and manipulation of oxygen-consuming industrial chemical processes. In the present study, Gd0.1Ce0.9O2-δ-La0.6Sr0.4FeO3-δ (GDC-LSF) dual-phase composite membrane was prepared using the phase-inversion tape casting/lamination/sintering method. The as-prepared membrane consisted of an 80 μm thick dense oxygen separation layer sandwiched between two 420 μm thick finger-like porous support layers. The inner surface of the support layers was further modified with Nd2NiO4+δ (NNO) nanoparticles using the impregnation method. An oxygen permeation flux of 1.53 mL·cm-2·min-1 was measured at 900 ℃ by exposing one side of the membrane to a flowing air stream and the other side to a flowing He stream. When CO2 was used as sweep gas, an oxygen permeation flux of 0.6 mL·cm-2·min-1 was obtained, and no decrease in the flux was observed during 90 h of testing. The membrane remained intact after experiencing over 70 thermal cycles between 800 and 900 ℃. GDC-LSF dual-phase composite membrane with straight pores and sandwich structure has demonstrated satisfactory combination of oxygen permeability, chemical stability and thermal mechanical strength, promising for applications in separation of oxygen from air and oxy-fuel combustion with CO2 capture.
Journal of Inorganic Materials
- Publication Date: May. 20, 2021
- Vol. 36, Issue 5, 497 (2021)
Hui XIANG, Hui QUAN, Yiyuan HU, Weiqian ZHAO, Bo XU, and Jiang YIN
By employing density functional theory calculations, the mechanical, electronic and piezoelectric properties of graphene-like monolayers ZnO (g-ZnO) and GaN (g-GaN) were investigated. Elastic stiffness constants and piezoelectric tensors of monolayers g-ZnO and g-GaN using their Clamped-ion and Relaxed-ion components were mainly studied. Results indicate that these two graphene-like structures are semiconductors with excellent elasticity. The piezoelectric coefficient of monolayers g-ZnO and g-GaN are about 9.4 and 2.2 pm·V-1, respectively, implying their piezoelectric effect in extremely thin film devices, especially the g-ZnO. The remarkable piezoelectricity of monolayer g-ZnO enables it a wide range of applications, such as mechanical stress sensors, actuators, transducer and energy harvesting devices. By employing density functional theory calculations, the mechanical, electronic and piezoelectric properties of graphene-like monolayers ZnO (g-ZnO) and GaN (g-GaN) were investigated. Elastic stiffness constants and piezoelectric tensors of monolayers g-ZnO and g-GaN using their Clamped-ion and Relaxed-ion components were mainly studied. Results indicate that these two graphene-like structures are semiconductors with excellent elasticity. The piezoelectric coefficient of monolayers g-ZnO and g-GaN are about 9.4 and 2.2 pm·V-1, respectively, implying their piezoelectric effect in extremely thin film devices, especially the g-ZnO. The remarkable piezoelectricity of monolayer g-ZnO enables it a wide range of applications, such as mechanical stress sensors, actuators, transducer and energy harvesting devices.
Journal of Inorganic Materials
- Publication Date: May. 20, 2021
- Vol. 36, Issue 5, 492 (2021)
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