Chemically and thermo-mechanically stable LSM–YSZ segmented oxygen permeable ceramic membrane

Yun, Kyong Sik; Yoo, Chung‐Yul; Yoon, Soon‐Gil; Yu, Ji Haeng; Joo, Jong Hoon

doi:10.1016/j.memsci.2015.03.049

Cited by 36 publications

(13 citation statements)

References 39 publications

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“…In our previous report, the phase of LSM was stable under presence of CO 2 atmosphere possibly due to the low SrO activity. 38 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 As expected, the oxygen flux through the membrane coated with STF is slightly lower than through the one coated with LSC. The electrochemical properties of the coating layer therefore influence the oxygen permeation fluxes achieved with these dual-phase membranes.…”

Section: Electrical Conductivities Of Lsm-gdc Compositesmentioning

confidence: 60%

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Joo

Yun

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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The oxygen permeation flux of dual-phase membranes, Ce0.9Gd0.1O2-δ-La0.7Sr0.3MnO3±δ (GDC/LSM), has been systematically studied as a function of their LSM content, thickness, and coating material. The electronic percolation threshold of this GDC/LSM membrane occurs at about 20 vol % LSM. The coated LSM20 (80 vol % GDC, 20 vol % LSM) dual-phase membrane exhibits a maximum oxygen flux of 2.2 mL·cm(-2)·min(-1) at 850 °C, indicating that to enhance the oxygen permeation flux, the LSM content should be adjusted to the minimum value at which electronic percolation is maintained. The oxygen ion conductivity of the dual-phase membrane is reliably calculated from oxygen flux data by considering the effects of surface oxygen exchange. Thermal cycling tests confirm the mechanical stability of the membrane. Furthermore, a dual-phase membrane prepared here with a cobalt-free coating remains chemically stable in a CO2 atmosphere at a lower temperature (800 °C) than has previously been achieved.

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Section: Electrical Conductivities Of Lsm-gdc Compositesmentioning

confidence: 60%

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Joo

Yun

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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“…As ar esult, the O 2 flux progressively improves from 0.13 up to 0.14 mL min À1 cm À2 .T he reason for this enhancement is still not fully understood, although similari mprovementsw ith time in J(O 2 )u nder CO 2 sweeping were also reported by several other studies on composite membranes. [21,24,[28][29][30]45] This can be ascribed to as urface and/or grain boundary processes, althoughY un et al suggested the relationw ith an effect known as "electrode activation" [25] that can be explained by the activation of the CGO-LSM catalytic layers. When switching again to argon sweeping, J(O 2 )r eturns to the initial value before CO 2 exposure.…”

Section: Sem Analysis (mentioning

confidence: 99%

“…Recent works on spinel-fluorite, [21][22][23][24] perovskite-fluorite, [25][26][27] and doped ZnO with fluorite [28] composite systemse xhibited material stability and promisingO 2 permeation under oxyfuel-like conditions. Gathering all the key features in one single materiali savery challenging issue.…”

Section: Introductionmentioning

confidence: 99%

“…Dual-phase composite materials comprising of two different crystalline materials, each one providing as pecific conductivity (electronic or ionic), is av ery interesting option for obtaining membranes with enough mixed conductivity and stabilityu nder the referred conditions. Recent works on spinel-fluorite, [21][22][23][24] perovskite-fluorite, [25][26][27] and doped ZnO with fluorite [28] composite systemse xhibited material stability and promisingO 2 permeation under oxyfuel-like conditions. Amongst all the studied composite materials, NiFe 2 O 4 -Ce 0.8 Tb 0.2 O 2Àd composite has shown ag ood performance in terms of O 2 production (0.2 mL min À1 cm À2 O 2 at 1000 8Ci na ir when using CO 2 as sweep gas for a0 .68 mm dense pellet membrane) and unprecedented chemical stability after 7days on-stream in CO 2 ,5%O 2 ,a nd 1% SO 2 in wet conditions.…”

Section: Introductionmentioning

confidence: 99%

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Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

2015

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Dual-phase membranes are appealing candidates for oxygen transport membranes owing to their unique combination of ambipolar electron-ion transport and endurance. However, O2 separation in industrial environments demands very high stability and effectiveness in the presence of CO2- and SO2-bearing process gases. Here, the composition of dual-phase membranes based on NiFe2O4-Ce(0.8) Tb(0.2)O(2-δ) (NFO-CTO) was optimized and the effective performance of catalytically-activated membranes was assessed in presence of CO2 and SO2. Further insight into the limiting mechanisms in the permeation was gained through electrical conductivity studies, permeation testing in several conditions and impedance spectroscopy analysis. The dual-phase membranes were prepared by one-pot sol-gel method and their permeability increases with increasing fluorite content. An O2 flux of 0.25 (ml min(-1) cm(-2)) mm at 1000 °C was obtained for a thick self-standing membrane with 40:60 NFO/CTO composition. An in-depth study mimicking typical harsh conditions encountered in oxyfuel flue gases was performed on a 50:50 NFO/CTO membrane. CO2 content as well as SO2 presence in the sweep gas stream were evaluated in terms of O2 permeation. O2 fluxes of 0.13 and 0.09 mL min(-1) cm(-2) at 850 °C were obtained for a 0.59 mm thick membrane under CO2 and 250 ppm SO2 in CO2 sweep conditions, respectively. Extended periods at work under CO2- and SO2-containing atmospheres revealed good permeation stability over time. Additionally, XRD, backscattered electrons detector (BSD)-SEM, and energy-dispersive X-ray spectroscopy (EDS) analysis of the spent membrane confirmed material stability upon prolonged exposure to SO2.

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“…One of the widest used SOFC cathode materials is the lanthanum strontium manganite (La 1–x Sr x MnO 3+δ – LSM) due to its high electronic conductivity (≈180 S cm −1 at 1,000 °C ), excellent catalytic properties and high thermal , and mechanical stability . Moreover, LSM is thermo‐chemically compatible with different electrolyte materials such as stabilized zirconias , and, doped cerias .…”

Section: Introductionmentioning

confidence: 99%

Tailoring Electrocatalytic Properties of Solid Oxide Fuel Cell Composite Cathodes Based on (La_0.8Sr_0.2)_0.95MnO_3+δ and Doped Cerias Ce_1–xLn_xO_2–δ (Ln=Gd, La, Er, Pr, Tb and x=0.1–0.2)

et al. 2016

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Composites made of different doped cerias and (La0.8Sr0.2)0.95MnO3+δ were studied as potential solid oxide fuel cell cathodes. Tb, Pr, Gd and Er have been introduced as ceria dopants to enhance the electrocatalytic properties of (La0.8Sr0.2)0.95MnO3+δ composites fabricated within. Different electrochemical behaviors were observed for the studied composites depending on lanthanide cation nature, i.e., whether they can exhibit different oxidation states or not. Specifically, (La0.8Sr0.2)0.95MnO3+δ/ceria composites with a mixed valence dopants (Tb and Pr) in the CeO2 structure are the best performing and present a limiting step at low frequencies; whereas those with ceria‐doping elements with fixed oxidation state (Gd and Er) exhibit the limiting processes at higher frequencies. This fact is related to the higher magnitude of the TPB enlargement in the composite cathode achieved thanks to the promotion of mixed ionic‐electronic conductivity in the Pr/Tb‐doped ceria phase. The best cathode performance was obtained with (La0.8Sr0.2)0.95MnO3+δ_Ce0.8Pr0.2O2–δ cathodes with the lowest values for the polarization resistance in the 900–700 °C temperature range.

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Chemically and thermo-mechanically stable LSM–YSZ segmented oxygen permeable ceramic membrane

Cited by 36 publications

References 39 publications

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

Tailoring Electrocatalytic Properties of Solid Oxide Fuel Cell Composite Cathodes Based on (La_0.8Sr_0.2)_0.95MnO_3+δ and Doped Cerias Ce_1–xLn_xO_2–δ (Ln=Gd, La, Er, Pr, Tb and x=0.1–0.2)

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Chemically and thermo-mechanically stable LSM–YSZ segmented oxygen permeable ceramic membrane

Cited by 36 publications

References 39 publications

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Substantial Oxygen Flux in Dual-Phase Membrane of Ceria and Pure Electronic Conductor by Tailoring the Surface

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

Tailoring Electrocatalytic Properties of Solid Oxide Fuel Cell Composite Cathodes Based on (La0.8Sr0.2)0.95MnO3+δ and Doped Cerias Ce1–xLnxO2–δ (Ln=Gd, La, Er, Pr, Tb and x=0.1–0.2)

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Tailoring Electrocatalytic Properties of Solid Oxide Fuel Cell Composite Cathodes Based on (La_0.8Sr_0.2)_0.95MnO_3+δ and Doped Cerias Ce_1–xLn_xO_2–δ (Ln=Gd, La, Er, Pr, Tb and x=0.1–0.2)