Journal articles: 'Oxygen conducting membrane'

1

Araki, Sadao. "Membrane Reactors Using Mixed Ionic–electric Conducting Oxygen–permeable Membranes." MEMBRANE 46, no. 3 (2021): 148–55. http://dx.doi.org/10.5360/membrane.46.148.

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Arratibel Plazaola, Alba, Aitor Cruellas Labella, Yuliang Liu, Nerea Badiola Porras, David Pacheco Tanaka, Martin Sint Annaland, and Fausto Gallucci. "Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review." Processes 7, no. 3 (March 1, 2019): 128. http://dx.doi.org/10.3390/pr7030128.

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Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

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Ma, Teng, Ning Han, Bo Meng, Naitao Yang, Zhonghua Zhu, and Shaomin Liu. "Enhancing Oxygen Permeation via the Incorporation of Silver Inside Perovskite Oxide Membranes." Processes 7, no. 4 (April 8, 2019): 199. http://dx.doi.org/10.3390/pr7040199.

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As a possible novel cost-effective method for oxygen production from air separation, ion-conducting ceramic membranes are becoming a hot research topic due to their potentials in clean energy and environmental processes. Oxygen separation via these ion-conducting membranes is completed via the bulk diffusion and surface reactions with a typical example of perovskite oxide membranes. To improve the membrane performance, silver (Ag) deposition on the membrane surface as the catalyst is a good strategy. However, the conventional silver coating method has the problem of particle aggregation, which severely lowers the catalytic efficiency. In this work, the perovskite oxide La0.8Ca0.2Fe0.94O3−a (LCF) and silver (5% by mole) composite (LCFA) as the membrane starting material was synthesized using one-pot method via the wet complexation where the metal and silver elements were sourced from their respective nitrate salts. LCFA hollow fiber membrane was prepared and comparatively investigated for air separation together with pure LCF hollow fiber membrane. Operated from 800 to 950 °C under sweep gas mode, the pure LCF membrane displayed the fluxes from 0.04 to 0.54 mL min−1 cm−2. Compared to pure LCF, under similar operating conditions, the flux of LCFA membrane was improved by 160%.

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Ivanov, Ivan L., Petr O. Zakiryanov, Vladimir V. Sereda, Maxim O. Mazurin, Dmitry A. Malyshkin, Andrey Yu Zuev, and Dmitry S. Tsvetkov. "Nonstoichiometry, Defect Chemistry and Oxygen Transport in Fe-Doped Layered Double Perovskite Cobaltite PrBaCo2−xFexO6−δ (x = 0–0.6) Membrane Materials." Membranes 12, no. 12 (November 28, 2022): 1200. http://dx.doi.org/10.3390/membranes12121200.

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Mixed conducting cobaltites PrBaCo2−xFexO6−δ (x = 0–0.6) with a double perovskite structure are promising materials for ceramic semi-permeable membranes for oxygen separation and purification due to their fast oxygen exchange and diffusion capability. Here, we report the results of the detailed study of an interplay between the defect chemistry, oxygen nonstoichiometry and oxygen transport in these materials as a function of iron doping. We show that doping leads to a systematic variation of both the thermodynamics of defect formation reactions and oxygen transport properties. Thus, iron doping can be used to optimize the performance of mixed conducting oxygen-permeable double perovskite membrane materials.

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Blond, E., and N. Richet. "Thermomechanical modelling of ion-conducting membrane for oxygen separation." Journal of the European Ceramic Society 28, no. 4 (January 2008): 793–801. http://dx.doi.org/10.1016/j.jeurceramsoc.2007.07.024.

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Świerczek, Konrad, Hailei Zhao, Zijia Zhang, and Zhihong Du. "MIEC-type ceramic membranes for the oxygen separation technology." E3S Web of Conferences 108 (2019): 01021. http://dx.doi.org/10.1051/e3sconf/201910801021.

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Mixed ionic-electronic conducting ceramic membrane-based oxygen separation technology attracts great attention as a promising alternative for oxygen production. The oxygen-transport membranes should not only exhibit a high oxygen flux but also show good stability under CO2-containing atmospheres. Therefore, designing and optimization, as well as practical application of membrane materials with good CO2 stability is a challenge. In this work, apart from discussion of literature data, authors’ own results are provided, which are focused on materia - related issues, including development of electrode materials exhibiting high ionic and electronic conductivities.

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Chua, J., C. Li, and J. Sunarso. "Pure oxygen separation from air using dual-phase SDC-SCFZ disc membrane: A modelling approach." IOP Conference Series: Materials Science and Engineering 1195, no. 1 (October 1, 2021): 012060. http://dx.doi.org/10.1088/1757-899x/1195/1/012060.

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Abstract Novel Ce0.8Sm0.2O1.9-SrCo0.4Fe0.55Zr0.05O3-δ (SDC-SCFZ) disc membranes consist of 25 wt.% SDC fluorite ionic conducting phase and 75 wt.% SCFZ perovskite mixed conducting phase, which is more promising than perovskite oxide SCFZ single-phase membrane in terms of the oxygen permeation flux. This work features a modelling approach to simulate the oxygen permeation fluxes of the SDC-SCFZ membrane. Simplified model equations from the Zhu model and Xu-Thomson model based on the limiting cases of surface exchange reactions and bulk diffusion are compared. The Zhu model is found to be more applicable for the membranes with overall good correlation and low sum of squared error. Furthermore, modelling studies revealed that the oxygen transport is limited by surface exchange reactions from 700 to 850 °C and a mixture of both limiting cases above 850 up to 950 °C. It is concluded that the membranes exhibit high oxygen permeation flux of up to 2×10−6 mol s−1 cm−2 at 950 °C with Pair of 5 atm and Po 2 of 0.005 atm. The optimum range of operating conditions of the membrane are found to be at 950 °C with minimum Pair of 1 atm and P11 2 lower than 0.025 atm.

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Lei, Song, Ao Wang, Jian Xue, and Haihui Wang. "Catalytic ceramic oxygen ionic conducting membrane reactors for ethylene production." Reaction Chemistry & Engineering 6, no. 8 (2021): 1327–41. http://dx.doi.org/10.1039/d1re00136a.

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Catalytic ceramic oxygen ionic conducting membrane reactors have great potential in the production of high value-added chemicals as they can couple chemical reactions with separation within a single unit, allowing process intensification.

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Zeng, Pingying, Ran Ran, Zhihao Chen, Hongxia Gu, Zongping Shao, and Shaomin Liu. "Novel mixed conducting SrSc0.05Co0.95O3-δ ceramic membrane for oxygen separation." AIChE Journal 53, no. 12 (2007): 3116–24. http://dx.doi.org/10.1002/aic.11334.

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Christoffersen, R., S. Kim, Y. L. Yang, and A. J. Jacobson. "Analytical TEM and EPMA Study of Decomposition Reactions in an Oxygen-Separation Membrane Material." Microscopy and Microanalysis 3, S2 (August 1997): 745–46. http://dx.doi.org/10.1017/s1431927600010618.

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Mixed-conducting oxides with appropriate values of electronic and ionic conductivity have the potential to be used as ceramic “membranes” for the separation of oxygen from other gases. The separation is based on oxygen transport from an O2-rich, and hence oxidizing, gas reservoir on one side of the membrane to an O2-lean, and hence reducing, take-up reservoir on the membrane's other side. The oxide Sr(Co1-xFex)O3-δ (SCFO), which has a cubic perovskite structure, is one such potential membrane material. Although the permeation flux of oxygen through SCFO membranes has been mea-sured, the microstructural evolution of SCFO membranes during permeation has been little studied in comparison to other potential membrane oxides. Several of these other systems do show segregation and/or decomposition phenomena that potentially may affect membrane properties. Here we report preliminary results of a systematic microanalytical study of SCFO membranes using scanning electron microscopy and microanalysis in an electron probe microanalyzer (EPMA), as well as transmission electron microscopy in an analytical TEM.

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Paradesi, Deivanayagam, Sivasubramanian Gandhimathi, Hariharasubramanian Krishnan, and Ramaswamy Jeyalakshmi. "A novel proton conducting polymer electrolyte membrane for fuel cell applications." High Performance Polymers 30, no. 1 (January 10, 2017): 116–25. http://dx.doi.org/10.1177/0954008316684931.

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A series of phenolphthalein-based sulfonated poly(ether ether sulfone) (SPEES) membranes were synthesized by aromatic nucleophilic polymerization reaction. The degree of sulfonation was controlled by direct synthesis of sulfonated polymer, which leads to high thermal stability. The physicochemical properties of the SPEES membranes were studied in order to evaluate the suitability of these membranes in fuel cell applications. The ion-exchange capacity of the synthesized SPEES membranes was found in the range between 2.19 mequiv. g−1 and 2.35 mequiv. g−1. The morphology of the membranes was investigated with high-resolution scanning electron microscopy and confirmed the presence of hydrophilic domains that impart good proton conductivity. The membrane electrode assembly of SPEES-30 and SPEES-50 membranes has been successfully fabricated, where SPEES-50 produced a maximum peak power density of 643 mW cm−2 while applying in hydrogen–oxygen fuel cell.

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12

Zhang, Zhenbao, Yubo Chen, Moses O. Tade, Yong Hao, Shaomin Liu, and Zongping Shao. "Tin-doped perovskite mixed conducting membrane for efficient air separation." J. Mater. Chem. A 2, no. 25 (2014): 9666–74. http://dx.doi.org/10.1039/c4ta00926f.

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13

Priest, Cameron, Yuqing Meng, Lucun Wang, and Dong Ding. "Ethylene Production from Oxidative Coupling of Methane in Solid Oxide Electrochemical Cells." ECS Meeting Abstracts MA2022-02, no. 49 (October 9, 2022): 1936. http://dx.doi.org/10.1149/ma2022-02491936mtgabs.

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The oxidative coupling of methane (OCM) to ethylene is a potentially more economical and environmentally benign approach for ethylene production compared to conventional high temperature thermal cracking of natural gas. The OCM reaction is typically conducted in packed bed flow reactors under thermal conditions in the presence of a heterogeneous catalyst. However, due to the intrinsic thermodynamic and kinetic constraints, the existing catalytic systems operated in packed bed reactors have not yet met the techno-economic requirements for the commercialization of this process. As an alternative, membrane reactors that selectively conduct the oxygen ions (O2-) could potentially offer significantly higher methane conversion and C2 product selectivity compared to conventional packed bed reactors. The lower partial pressure of oxygen and the distinct nature of oxygen species available for methane oxidation in the membrane reactor could effectively suppress the kinetics of the chemical transformations leading to the combustion products. In this context, solid oxide electrochemical cells (SOEC), specifically based on oxygen ion conducting membranes, are excellent platforms for conducting the OCM reaction. Here we demonstrate the development of novel SOECs integrated with a series of advanced OCM catalysts to achieve highly efficient ethylene production.

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Wu, Zhentao, Xueliang Dong, Wanqin Jin, Yiqun Fan, and Nanping Xu. "A dense oxygen separation membrane deriving from nanosized mixed conducting oxide." Journal of Membrane Science 291, no. 1-2 (March 2007): 172–79. http://dx.doi.org/10.1016/j.memsci.2007.01.005.

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15

Escolástico, Sonia, Falk Schulze-Küppers, Stefan Baumann, Katja Haas-Santo, and Roland Dittmeyer. "Development and Proof of Concept of a Compact Metallic Reactor for MIEC Ceramic Membranes." Membranes 11, no. 7 (July 16, 2021): 541. http://dx.doi.org/10.3390/membranes11070541.

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The integration of mixed ionic–electronic conducting separation membranes in catalytic membrane reactors can yield more environmentally safe and economically efficient processes. Concentration polarization effects are observed in these types of membranes when O2 permeating fluxes are significantly high. These undesired effects can be overcome by the development of new membrane reactors where mass transport and heat transfer are enhanced by adopting state-of-the-art microfabrication. In addition, careful control over the fluid dynamics regime by employing compact metallic reactors equipped with microchannels could allow the rapid extraction of the products, minimizing undesired secondary reactions. Moreover, a high membrane surface area to catalyst volume ratio can be achieved. In this work, a compact metallic reactor was developed for the integration of mixed ionic–electronic conducting ceramic membranes. An asymmetric all-La0.6Sr0.4Co0.2Fe0.8O3–δ membrane was sealed to the metallic reactor by the reactive air brazing technique. O2 permeation was evaluated as a proof of concept, and the influence of different parameters, such as temperature, sweep gas flow rates and oxygen partial pressure in the feed gas, were evaluated.

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16

Lee, Shi Woo, Tae Ho Shin, Kee Sung Lee, In Sub Han, Doo Won Seo, Kee Seog Hong, and Sang Kuk Woo. "Surface Modification and Characterization of Perovskite-Type Mixed Ionic-Electronic Conductors." Materials Science Forum 449-452 (March 2004): 1297–300. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.1297.

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Surface modification effects have been investigated for perovskite-type mixed ionic-electronic conductors. As the mixed conducting oxides show both ionic and electronic conductivity, these can be applied as oxygen permeable membranes. We have coated surfaces of the perovskite-type mixed conductors, LaSrCoFeO3 and LaSrGaFeO3, with LaSrCoO3 and investigated the effects on oxygen permeability. Enhanced oxygen permeability was achieved when the LaSrGaFeO3 membrane was surface-modified with LaSrCoO3. However, there was no effect on oxygen permeability of LaSrCoFeO3 even when the surface of which was modified. The morphological factors related with electrochemical reactions have also been discussed

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17

Wang, Ao, Man Liang, Qingyun Xiang, Jian Xue, and Haihui Wang. "Mixed Oxygen Ionic and Electronic Conducting Membrane Reactors for Pure Chemicals Production." Chemie Ingenieur Technik 94, no. 1-2 (November 24, 2021): 31–41. http://dx.doi.org/10.1002/cite.202100160.

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Serra, E., M. Alvisi, E. Casagrande, G. Bezzi, C. Mingazzini, and A. La Barbera. "Oxygen- and hydrogen-permeation measurements on-mixed conducting SrFeCo0.5Oy ceramic membrane material." Renewable Energy 33, no. 2 (February 2008): 241–47. http://dx.doi.org/10.1016/j.renene.2007.05.028.

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Zhu, Jiawei, Shaobin Guo, Zhicheng Zhang, Xin Jiang, Zhengkun Liu, and Wanqin Jin. "CO2-tolerant mixed-conducting multichannel hollow fiber membrane for efficient oxygen separation." Journal of Membrane Science 485 (July 2015): 79–86. http://dx.doi.org/10.1016/j.memsci.2015.02.034.

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Pfaff, E. M., A. Kaletsch, and C. Broeckmann. "Design of a Mixed Ionic/Electronic Conducting Oxygen Transport Membrane Pilot Module." Chemical Engineering & Technology 35, no. 3 (February 27, 2012): 455–63. http://dx.doi.org/10.1002/ceat.201100447.

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Liao, Ming-Wei, Tai-Nan Lin, Wei-Xin Kao, Chun-Yen Yeh, Yu-Ming Chen, and Hong-Yi Kuo. "Composite mixed ionic-electronic conducting ceramic for intermediate temperature oxygen transport membrane." Ceramics International 43 (August 2017): S628—S632. http://dx.doi.org/10.1016/j.ceramint.2017.05.222.

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Ge, Lei, Zongping Shao, Kun Zhang, Ran Ran, J. C. Diniz da Costa, and Shaomin Liu. "Evaluation of mixed-conducting lanthanum-strontium-cobaltite ceramic membrane for oxygen separation." AIChE Journal 55, no. 10 (October 2009): 2603–13. http://dx.doi.org/10.1002/aic.11857.

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23

Xu, Zixiang, Jian Yu, and Wei Wang. "Zirconium and Yttrium Co-Doped BaCo0.8Zr0.1Y0.1O3-δ: A New Mixed-Conducting Perovskite Oxide-Based Membrane for Efficient and Stable Oxygen Permeation." Membranes 12, no. 9 (August 25, 2022): 831. http://dx.doi.org/10.3390/membranes12090831.

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Oxygen permeation membranes (OPMs) are regarded as promising technology for pure oxygen production. Among various materials for OPMs, perovskite oxides with mixed electron and oxygen-ion (e−/O2−) conducting capability have attracted particular interest because of the high O2− conductivity and structural/compositional flexibility. However, BaCoO3−δ-based perovskites as one of the most investigated OPMs suffer from low oxygen permeation rate and inferior structural stability in CO2-containing atmospheres. Herein, zirconium and yttrium co-doped BaCoO3−δ (BaCo1−2xZrxYxO3−δ, x = 0, 0.05, 0.1 and 0.15) are designed and developed for efficient and stable OPMs by stabilizing the crystal structure of BaCoO3−δ. With the increased Zr/Y co-doping content, the crystal structural stability of doped BaCoO3−δ is much improved although the oxygen permeation flux is slightly reduced. After optimizing the co-doping amount, BaCo0.8Zr0.1Y0.1O3−δ displays both a high rate and superior durability for oxygen permeation due to the well-balanced grain size, oxygen-ion mobility, crystal structural stability, oxygen vacancy concentration and surface exchange/bulk diffusion capability. Consequently, the BaCo0.8Zr0.1Y0.1O3−δ membrane delivers a high oxygen permeation rate of 1.3 mL min−1 cm−2 and relatively stable operation at 800 ∘C for 100 h. This work presents a promising co-doping strategy to boost the performance of perovskite-based OPMs, which can promote the industrial application of OPM technology.

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Shen, Pei Jun, Wei Zhong Ding, Hai Hai Wang, Zhen Geng, Xu Liu, Yu Ding Zhou, and Shao Qing Huang. "Performance of BaCo_0.7Fe_0.2Nb_0.1O_3-δ Membrane under CO₂-Containing Atmosphere for CCS Application." Advanced Materials Research 239-242 (May 2011): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.21.

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Mixed ionic-electronic conducting BaCo0.7Fe0.2Nb0.1O3-δ perovskite is a newly developed promising ceramic membrane material. In this work, the stability and permeability of BaCo0.7Fe0.2Nb0.1O3-δ regarding the special requirements for CCS application are investigated. CO2 would deteriorate the membrane performance by decreasing gradient of oxygen vacancy across bulk and surface carbonatation.

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Cai, Lili, Jingyi Wang, Xuefeng Zhu, and Weishen Yang. "Recent Progress on Mixed Conducting Oxygen Transport Membrane Reactors for Water Splitting Reaction." Acta Chimica Sinica 79, no. 5 (2021): 588. http://dx.doi.org/10.6023/a20120561.

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Eichhorn Colombo, Konrad, Lars Imsland, Olav Bolland, and Svein Hovland. "Dynamic modelling of an oxygen mixed conducting membrane and model reduction for control." Journal of Membrane Science 336, no. 1-2 (July 2009): 50–60. http://dx.doi.org/10.1016/j.memsci.2009.02.035.

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27

ITO, W., T. NAGAI, and T. SAKON. "Oxygen separation from compressed air using a mixed conducting perovskite-type oxide membrane." Solid State Ionics 178, no. 11-12 (May 15, 2007): 809–16. http://dx.doi.org/10.1016/j.ssi.2007.02.031.

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28

Fang, Wei, Fangyi Liang, Zhengwen Cao, Frank Steinbach, and Armin Feldhoff. "A Mixed Ionic and Electronic Conducting Dual-Phase Membrane with High Oxygen Permeability." Angewandte Chemie 127, no. 16 (February 23, 2015): 4929–32. http://dx.doi.org/10.1002/ange.201411963.

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Fang, Wei, Fangyi Liang, Zhengwen Cao, Frank Steinbach, and Armin Feldhoff. "A Mixed Ionic and Electronic Conducting Dual-Phase Membrane with High Oxygen Permeability." Angewandte Chemie International Edition 54, no. 16 (February 23, 2015): 4847–50. http://dx.doi.org/10.1002/anie.201411963.

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30

Snijkers, Frans, Cédric Buysse, Vesna Middelkoop, Anita Buekenhoudt, and Andrei Kovalevsky. "Mixed Conducting Ceramic Capillary Membranes for Catalytic Membrane Reactors: Performance of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ Capillaries." Advanced Materials Research 560-561 (August 2012): 853–59. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.853.

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Oxygen-permeable perovskite ceramics with mixed ionic-electronic conducting properties can play an important role in the high temperature separation of oxygen from air. Such membranes are envisaged for application in catalytic membranes reactors and in oxy-fuel and pre-combustion technologies for fossil fuel power plants enabling CO2 capture. Since large-scale gas separation applications demand high membrane surface/volume ratios, membranes with capillary or hollow fiber geometry have a distinct advantage over tubular and flat sheet membranes. The fabrication and performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) capillary membranes is presented. The capillaries were made by a spinning technique based on phase inversion using a sulfur or non-sulfur containing polymer binder. Attention is given to the polymer solution and ceramic spinning suspension in order to avoid the formation of macrovoids and achieve gastight membranes. The comparison of the performance of sulfur-free and sulfur-containing BSCF capillaries with similar dimensions revealed a profound impact of the sulfur contamination on both the oxygen flux and the activation energy of the overall oxygen transport mechanism. In addition the effect of activation layers on oxygen permeation is studied.

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Tong, Jingjing, Xueling Lei, Jie Fang, Minfang Han, and Kevin Huang. "Remarkable O2 permeation through a mixed conducting carbon capture membrane functionalized by atomic layer deposition." Journal of Materials Chemistry A 4, no. 5 (2016): 1828–37. http://dx.doi.org/10.1039/c5ta10105k.

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Maruthapandi, Moorthy, Arumugam Saravanan, Akanksha Gupta, John H. T. Luong, and Aharon Gedanken. "Antimicrobial Activities of Conducting Polymers and Their Composites." Macromol 2, no. 1 (February 9, 2022): 78–99. http://dx.doi.org/10.3390/macromol2010005.

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Conducting polymers, mainly polyaniline (PANI) and polypyrrole (PPY) with positive charges bind to the negatively charged bacterial membrane to interfere with bacterial activities. After this initial electrostatic adherence, the conducting polymers might partially penetrate the bacterial membrane and interact with other intracellular biomolecules. Conducting polymers can form polymer composites with metal, metal oxides, and nanoscale carbon materials as a new class of antimicrobial agents with enhanced antimicrobial properties. The accumulation of elevated oxygen reactive species (ROS) from composites of polymers-metal nanoparticles has harmful effects and induces cell death. Among such ROS, the hydroxyl radical with one unpaired electron in the structure is most effective as it can oxidize any bacterial biomolecules, leading to cell death. Future endeavors should focus on the combination of conducting polymers and their composites with antibiotics, small peptides, and natural molecules with antimicrobial properties. Such arsenals with low cytotoxicity are expected to eradicate the ESKAPE pathogens: Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp.

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Eksatit, Aunsaya, Kento Ishii, Masako Uematsu, Li Hong Liu, and Tetsuo Uchikoshi. "Fabrication of YSZ-Carbon Felt Composite Materials by Spark Plasma Sintering Process." Key Engineering Materials 904 (November 22, 2021): 339–43. http://dx.doi.org/10.4028/www.scientific.net/kem.904.339.

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Dual-phase membrane composed of oxide ion conductor and electron conductor was fabricated for application to oxygen separation membranes. 8 mol% yttria-stabilized zirconia (8YSZ) and carbon felt were used for the oxide ion conducting phase and the electron conductiing phase, respectively. Carbon felt was impregnated with YSZ aqueous suspension (40 wt%), dried, then sintered by a spark plasma sintering (SPS) process under the applied pressure of 80 MPa at 1200, 1400 and 1600 ° C for 10 min. When sintered at 1600 ° C, the XRD pattern showed small peaks indicating the formation of the zirconium carbide phase, but the microstructure observed by SEM showed that the YSZ was well densified and tightly bonded with carbon felt. This method has been demonstrated to be an effective process for the fabrication of YSZ-Carbon composites with both phases percolation structure.

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Sigwadi, Rudzani, Touhami Mokrani, Phumlani Msomi, and Fulufhelo Nemavhola. "The Effect of Sulfated Zirconia and Zirconium Phosphate Nanocomposite Membranes on Fuel-Cell Efficiency." Polymers 14, no. 2 (January 10, 2022): 263. http://dx.doi.org/10.3390/polym14020263.

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To investigate the effect of acidic nanoparticles on proton conductivity, permeability, and fuel-cell performance, a commercial Nafion® 117 membrane was impregnated with zirconium phosphates (ZrP) and sulfated zirconium (S-ZrO2) nanoparticles. As they are more stable than other solid superacids, sulfated metal oxides have been the subject of intensive research. Meanwhile, hydrophilic, proton-conducting inorganic acids such as zirconium phosphate (ZrP) have been used to modify the Nafion® membrane due to their hydrophilic nature, proton-conducting material, very low toxicity, low cost, and stability in a hydrogen/oxygen atmosphere. A tensile test, water uptake, methanol crossover, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) were used to assess the capacity of nanocomposite membranes to function in a fuel cell. The modified Nafion® membrane had a higher water uptake and a lower water content angle than the commercial Nafion® 117 membrane, indicating that it has a greater impact on conductivity. Under strain rates of 40, 30, and 20 mm/min, the nanocomposite membranes demonstrated more stable thermal deterioration and higher mechanical strength, which offers tremendous promise for fuel-cell applications. When compared to 0.113 S/cm and 0.013 S/cm, respectively, of commercial Nafion® 117 and Nafion® ZrP membranes, the modified Nafion® membrane with ammonia sulphate acid had the highest proton conductivity of 7.891 S/cm. When tested using a direct single-cell methanol fuel cell, it also had the highest power density of 183 mW cm−2 which is better than commercial Nafion® 117 and Nafion® ZrP membranes.

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Hendriksen, P. V., M. Sogaard, and P. Plonczak. "(Invited) Methodologies for Characterizing Mixed Conducting Oxides for Oxygen Membrane and SOFC Cathode Application." ECS Transactions 45, no. 1 (April 27, 2012): 251–64. http://dx.doi.org/10.1149/1.3701315.

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Tong, Jianhua, Weishen Yang, Hiroyuki Suda, and Kenji Haraya. "Initiation of oxygen permeation and POM reaction in different mixed conducting ceramic membrane reactors." Catalysis Today 118, no. 1-2 (October 2006): 144–50. http://dx.doi.org/10.1016/j.cattod.2006.02.089.

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Zhang, Lei, Chengsong Ma, and Sanjeev Mukerjee. "Oxygen reduction and transport characteristics at a platinum and alternative proton conducting membrane interface." Journal of Electroanalytical Chemistry 568 (July 2004): 273–91. http://dx.doi.org/10.1016/j.jelechem.2004.02.003.

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Peng, Zuoyan, Meilin Liu, and Ed Balko. "A new type of amperometric oxygen sensor based on a mixed-conducting composite membrane." Sensors and Actuators B: Chemical 72, no. 1 (January 2001): 35–40. http://dx.doi.org/10.1016/s0925-4005(00)00629-8.

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Dong, Hui, Guoxing Xiong, Zongping Shao, Shenglin Liu, and Weishen Yang. "Partial oxidation of methane to syngas in a mixed-conducting oxygen permeable membrane reactor." Chinese Science Bulletin 45, no. 3 (February 2000): 224–26. http://dx.doi.org/10.1007/bf02884677.

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Kruczala, Krzysztof, and Dario R. Dekel. "(Invited) Operando EPR Study on Radicals in Anion-Exchange Membrane Fuel Cells." ECS Meeting Abstracts MA2022-02, no. 43 (October 9, 2022): 1623. http://dx.doi.org/10.1149/ma2022-02431623mtgabs.

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In the rapidly developing modern society, there is an urgent need for the wide-ranging availability of advanced and eco-friendly energy sources. One of the possible alternatives is the application of anion exchange membrane fuel cells (AEMFCs) with a catalyst reducing dioxygen efficiently. These promising devices can revolutionize the energy sector since they practically produce no pollution. However, to make them more widely used, several obstacles must be overcome. As a result, vast-ranging investigations focus on improving the properties of conductive polymer membranes [1] and catalysts for the oxygen reduction reaction (ORR) [2]. The durability of the membrane electrode assembly (MEA) is one of the critical requirements for the successful commercialization of anion exchange membrane fuel cells (AEMFCs). Despite significant impacts of nucleophilic degradation on ion-exchange capability and the anionic conductivity of investigated membranes, it is believed to affect only cationic sites of membrane polymers and thus cannot explain the reported loss in the mechanical strength of degraded AEMs. Such a phenomenon might be related to polymer backbone degradation caused by free radicals. This was widely described in the literature in the case of fuel cells using proton-conducting membranes [3] but barely mentioned for AEMFCs [4]. Since the oxidative degradation of hydrocarbon polymers is very well known, we aimed to comprehensively investigate the formation of the short-lived species generated during the operation of AEMFCs as well as stable radicals present in the polymer membranes. We investigated the LDPE-base membranes with Pt black, Pd black, PdAg, and Ag as the ORR catalysts, whereas for HOR the Pt black, Pd black, and NiFe catalysts were used. The in-situ measurements are performed with a micro-AEMFC inserted into a resonator of an electron paramagnetic resonance (EPR) spectrometer, which enables separate monitoring of radicals formed on the anode and cathode sides. The creation of radicals was monitored by the EPR spin trapping technique. In Figure 1 the EPR spectra of DMPO spin adducts trapped during operation of micro-fuel cell placed in EPR spectrometer cavity are presented. In this experiment, the LDPE-base membrane with platinum catalysts on both sides was used. The main detected adducts during the operation of the micro-AEMFC were DMPO-OOH and DMPO-OH on the cathode side and DMPO-H on the anode side. Additionally, we clearly show the formation and presence of stable radicals in AEMs during and after long-term AEMFC operation [5]. Preliminary results suggest that the creation of the short-living radicals during AEMFCs operation is independent of the used membrane. However, the applied catalysts determine the number of detected radicals. The EPR investigations indicate that, in addition to the known chemical degradation mechanisms of the cationic ammonium groups of the membrane, oxidative degradation, including radical reactions, has to be taken into account when the stability of an anion conductive polymer for AEMFCs is investigated. The formation of stable radicals in AEMs was proven for the first time in this study. All short-living radicals formed during the AEMFC operation were fully identified. The presence of radicals in the AEM after AEMFC testing indicates that reactive oxygen species may play a very important role in the degradation mechanism of the anion conducting polymers. Results from this study shed light on the understanding of radical formation and presence in the membranes during AEMFC tests, which in turn may help to solve the challenge of anion exchange membrane stability. Acknowledgments. This work was supported by the Polish National Science Centre (NCN) project OPUS-14, No. 2017/27/B/ST5/01004. References: Dekel, D. R.; Rasin, I. G.; Brandon, S. Predicting Performance Stability of Anion Exchange Membrane Fuel Cells, Power Sources 2019, 420, 118−123. Kostuch A.; Jarczewski S.; Surówka M.K.; Kuśtrowski P.; Sojka Z.; Kruczała K. The joint effect of electrical conductivity and surface oxygen functionalities of carbon supports on the oxygen reduction reaction studied over bare supports and Mn–Co spinel/carbon catalysts in alkaline media, Catal. Technol., 2021, 11, 7578–7591 Łańcucki, L.; Schlick, S.; Danilczuk, M.; Coms, F. D.; Kruczała, K. Sulfonated Poly(Benzoyl Paraphenylene) as a Membrane for PEMFC: Ex Situ and in Situ Experiments of Thermal and Chemical Stability, Polym. Degrad. Stab. 2013, 98 (1), 3. Mustain, W.; Chatenet, M.; Page, M.; Kim, Y. S. Durability Challenges of Anion Exchange Membrane Fuel Cells, Energy Environ. Sci. 2020, 17−19. Wierzbicki, S.; Douglin, J. C.; Kostuch, A.; Dekel D. R.; Kruczała, K. Are Radicals Formed During Anion-Exchange Membrane Fuel Cell Operation?, J. Phys. Chem. Lett., 2020, 11, 7630–7636. Figure 1

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Haugen, Astri, Lev Aguilera, Kawai Kwok, Tesfaye Molla, Kjeld Andersen, Stéven Pirou, Andreas Kaiser, Peter Hendriksen, and Ragnar Kiebach. "Exploring the Processing of Tubular Chromite- and Zirconia-Based Oxygen Transport Membranes." Ceramics 1, no. 2 (September 29, 2018): 229–45. http://dx.doi.org/10.3390/ceramics1020019.

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Tubular oxygen transport membranes (OTMs) that can be directly integrated in high temperature processes have a large potential to reduce CO2 emissions. However, the challenging processing of these multilayered tubes, combined with strict material stability requirements, has so far hindered such a direct integration. We have investigated if a porous support based on (Y2O3)0.03(ZrO2)0.97 (3YSZ) with a dense composite oxygen membrane consisting of (Y2O3)0.01(Sc2O3)0.10(ZrO2)0.89 (10Sc1YSZ) as an ionic conductor and LaCr0.85Cu0.10Ni0.05O3−δ (LCCN) as an electronic conductor could be fabricated as a tubular component, since these materials would provide outstanding chemical and mechanical stability. Tubular components were made by extrusion, dip coating, and co-sintering, and their chemical and mechanical integrity was evaluated. Sufficient gas permeability (≥10−14 m2) and mechanical strength (≥50 MPa) were achieved with extruded 3YSZ porous support tubes. The high co-sintering temperature required to densify the 10ScYSZ/LCCN membrane on the porous support, however, causes challenges related to the evaporation of chromium from the membrane. This chemical degradation caused loss of the LCCN electronic conducting phase and the formation of secondary lanthanum zirconate compounds and fractures. LCCN is therefore not suitable as the electronic conductor in a tubular OTM, unless means to lower the sintering temperature and reduce the chromium evaporation are found that are applicable to the large-scale fabrication of tubular components.

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Klie, R. F., and N. D. Browning. "Atomic Scale Characterization of Oxygen Vacancy Ordering in Oxygen Conducting Membranes By Z-Contrast IMAGING and EELS." Microscopy and Microanalysis 7, S2 (August 2001): 214–15. http://dx.doi.org/10.1017/s1431927600027148.

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Mixed conductors have been the focus of many studies in the last decade, leading to a detailed understanding of many of the macroscopic bulk properties of these materials. in particular, although the reduced low temperature phase in rare earth perovskite oxides is commonly explained in terms of ordered brownmillerite structured micro domains, its transition to the high temperature phase remains elusive. in this presentation an investigation of (La, Sr)FeO3, prepared under different reducing conditions through correlated atomic resolution annular dark field imaging and electron energy loss spectroscopy will be shown.We investigate the (La, Sr)FeO3 material by atomic resolution Z-contrast imaging and EELS using a 200 keV STEM/TEM JEOL2010F with a post column GIF. The combination of these techniques allows us to obtain direct images from the atomic structure of the bulk sample and to correlate this with the atomically resolved EELS information. In-situ heating of the material in a heating double tilt holder in the microscope columns allows us to simulate the highly reducing operating conditions for this oxygen conducting membrane material.

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Park, Jong-Hyeok, Beom-Seok Kim, and Jin Soo Park. "Role of Ionomer Dispersion in the Design of Microstructure of Catalyst Layers: Oxygen and Hydrogen Evolution Reactions." ECS Meeting Abstracts MA2022-02, no. 39 (October 9, 2022): 1387. http://dx.doi.org/10.1149/ma2022-02391387mtgabs.

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Green hydrogen production is importance in the upcoming hydrogen economy era. Proton exchange membrane (PEM) water electrolysis is one of the most important technology to produce the green hydrogen that requires only water and extra electricity supplied from renewable energy. Main component, i.e., membrane electrode assembly (MEA), is a key part consisting of polymer electrolyte membrane and two electrodes which are oxygen evolution reaction (OER) electrode and hydrogen evolution (HER) electrode. Both electrode should be coated on the surface of membranes for better performance and mass production. Catalyst layers for OER and HER electrodes are composed of an electrocatalyst (Pt/C) and proton conducting ionomer. In the previous literature, proton conducting ionomer directly affects their performance and durability. Thus, the optimized design of the microstructure of the catalyst layers is essential. In this study, for the reduction of hydrogen production cost, highly dispersed ionomers were introduced to develop the optimized catalyst layers for OER and HER. The effect of dispersing solvents for ionomers on the performance and durability of catalyst layers was mainly investigated. Developed ionomer dispersions showed higher performance and durability in PEM water electrolysis, which result was made by the electrochemical characterization such as I-V polarization, voltage increasing rate during durability test, and so on as well as the microscopic characterization such as SEM and TEM were carried out to evaluate the effect of ionomer dispersions on the performance and durability of HER electrode in PEM water electrolysis. Acknowledgments This research was supported in part by the Hydrogen Energy Innovation Technology Development Program of the National Research Foundation (NRF) funded by the Ministry of Science, ICT ＆ Future Planning (NRF-2019M3E6A1063677) and by 2022 Green Convergence Professional Manpower Training Program of the Korea Environmental Industry and Technology Institute funded by the Ministry of Environment.

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Woolley,, David E., Uday B. Pal,, and George B. Kenney,. "Electrowinning Magnesium Metal from MgCl2-NdOCl Melt Using Solid-Oxide Oxygen-Ion-Conducting Membrane Technology." High Temperature Materials and Processes 20, no. 3-4 (October 2001): 209–18. http://dx.doi.org/10.1515/htmp.2001.20.3-4.209.

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Shao, Zongping, Hui Dong, Guoxing Xiong, You Cong, and Weishen Yang. "Performance of a mixed-conducting ceramic membrane reactor with high oxygen permeability for methane conversion." Journal of Membrane Science 183, no. 2 (March 2001): 181–92. http://dx.doi.org/10.1016/s0376-7388(00)00591-3.

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Zhu, Jiawei, Zhengkun Liu, Shaobin Guo, and Wanqin Jin. "Influence of permeation modes on oxygen permeability of the multichannel mixed-conducting hollow fibre membrane." Chemical Engineering Science 122 (January 2015): 614–21. http://dx.doi.org/10.1016/j.ces.2014.10.014.

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Musselman, I. H., L. Washmon, D. Varadarajan, B. J. Tielsch, and J. E. Fulghum. "Poly(3-alkylthiophene) membranes for gas separation." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 862–63. http://dx.doi.org/10.1017/s0424820100166774.

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The separation of gases is a commercial process conducted primarily via cryogenic distillation. An alternative method involves the use of solvent cast polymer membranes. Unlike distillation, membrane processes are energy efficient, easy to scale-up, and require only electrical energy in their operation. Current membrane separation applications include oxygen or nitrogen enrichment of air, the separation of carbon dioxide from natural gases, and the recovery of hydrogen from refinery and purge streams. In our laboratory, gas separation membranes are being developed based on conducting, soluble and processable polymers such as poly(3-n-alkylthiophene)s. The chemistry of these membranes is being altered by changing the R group (e.g. octyl, dodecyl), the oxidation state, and by incorporating zeolites and molecular sieves to facilitate gas transport. An important aspect of this project concerns establishing the relationship(s) between the structure of poly(3-alkylthiophene) membranes and their bulk properties, specifically permeabilities and selectivities for various gases. It is anticipated that this understanding will help to elucidate the mechanism by which gas separation occurs in these membranes.

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McHugh, Patrick J., Arindam K. Das, Alexander G. Wallace, Vaibhav Kulshrestha, Vinod K. Shahi, and Mark D. Symes. "An Investigation of a (Vinylbenzyl) Trimethylammonium and N-Vinylimidazole-Substituted Poly (Vinylidene Fluoride-Co-Hexafluoropropylene) Copolymer as an Anion-Exchange Membrane in a Lignin-Oxidising Electrolyser." Membranes 11, no. 6 (June 2, 2021): 425. http://dx.doi.org/10.3390/membranes11060425.

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Electrolysis is seen as a promising route for the production of hydrogen from water, as part of a move to a wider “hydrogen economy”. The electro-oxidation of renewable feedstocks offers an alternative anode couple to the (high-overpotential) electrochemical oxygen evolution reaction for developing low-voltage electrolysers. Meanwhile, the exploration of new membrane materials is also important in order to try and reduce the capital costs of electrolysers. In this work, we synthesise and characterise a previously unreported anion-exchange membrane consisting of a fluorinated polymer backbone grafted with imidazole and trimethylammonium units as the ion-conducting moieties. We then investigate the use of this membrane in a lignin-oxidising electrolyser. The new membrane performs comparably to a commercially-available anion-exchange membrane (Fumapem) for this purpose over short timescales (delivering current densities of 4.4 mA cm−2 for lignin oxidation at a cell potential of 1.2 V at 70 °C during linear sweep voltammetry), but membrane durability was found to be a significant issue over extended testing durations. This work therefore suggests that membranes of the sort described herein might be usefully employed for lignin electrolysis applications if their robustness can be improved.

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Lee, Dong Gyu, Ji Woo Nam, Soo-Hyun Kim, and Seong Wook Cho. "Structure Optimization of a High-Temperature Oxygen-Membrane Module Using Finite Element Analysis." Energies 14, no. 16 (August 14, 2021): 4992. http://dx.doi.org/10.3390/en14164992.

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The oxygen transport membrane (OTM) is a high-density ion-conducting ceramic membrane that selectively transfers oxygen ions and electrons through the pressure differential across its layers. It can operate at more than 800 °C and serves as an economical method for gas separation. However, it is difficult to predict the material properties of the OTM through experiments or analyses because its structure contains pores and depends on the characteristics of the ceramic composite. In addition, the transmittance of porous ceramic materials fluctuates strongly owing to their irregular structure and arbitrary shape, making it difficult to design such materials using conventional methods. This study analyzes the structural weakness of an OTM using CAE software (ANSYS Inc., Pittsburgh, PA, USA). To enhance the structural strength, a structurally optimized design of the OTM was proposed by identifying the relevant geometric parameters.

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Guo, Shaobin, Jiawei Zhu, Zhengkun Liu, Xin Jiang, Zhicheng Zhang, and Wanqin Jin. "Enhanced High Oxygen Permeation of Mixed-Conducting Multichannel Hollow Fiber Membrane via Surface Modified Porous Layer." Industrial & Engineering Chemistry Research 54, no. 27 (July 2, 2015): 6985–92. http://dx.doi.org/10.1021/acs.iecr.5b01009.

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Journal articles on the topic 'Oxygen conducting membrane'

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