Performance of functional perovskite membranes for oxygen production

Vente, Jaap F.; Haije, W.G.; Rak, Z.

doi:10.1016/j.memsci.2005.09.046

Cited by 163 publications

(77 citation statements)

References 22 publications

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“…Since this low frequency process exhibits an oxygen partial pressure dependence of pO 2 −0.98 close to n = −1, it is associated to molecular oxygen diffusion within the cathode setup, the contacting gold meshes and the porous cathode. 35 The exponent is in agreement with other reported literature values (pO 2 −n , n = 0.93-1.08). -Process 2 (P2) shows thermal activation and is oxygen partial pressure dependent.…”

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confidence: 92%

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Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

Almar

Szász

Weber

et al. 2017

J. Electrochem. Soc.

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The oxygen reduction reaction of mixed ionic-electronic conducting (MIEC) cathodes Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) and La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) is investigated by detailed electrochemical impedance spectroscopy and focused ion beam tomography. The oxygen transport parameters of these materials are usually determined for model systems, such as dense bulks or thin films. However in the present study, probable differences regarding the time and thermal history of the samples (e.g. ambient poisoning gases, grain coarsening, secondary phase or surface segregation, etc.) were avoided by the in situ sintering of electrodes with nominal stoichiometry under synthetic air. The microstructural parameters of the electrodes are obtained by 3D FIB-SEM reconstruction tomography and subsequently used in combination with the Adler-Lane-Steele analytical model to calculate a simulated cathode resistance. Large discrepancies are observed compared to the electrochemical impedance measurements. In particular, the electrochemical impedance measurements do not show a Gerischer behavior, as expected for MIEC materials controlled by a coupled surface-exchange and bulk diffusion. Analysis by distribution function of relaxation times (DRT) reveals four individual processes taking place, indicating a surface-exchange controlled behavior with a reaction zone similar to the particle size. Bulk diffusion (D) and surface-exchange (k) coefficients from literature are critically discussed and tentative surface-exchange coefficients (k) for both MIECs are given. High-temperature devices such as solid oxide fuel cells (SOFCs) and oxygen transport membranes (OTMs) are promising systems for working towards zero-emissions power generation. The selected materials require high chemical and microstructural stability, as well as high catalytic activity during the oxygen reduction reaction (ORR), under normal operational conditions (i.e. operational temperature and oxygen partial pressure). Particularly interesting are the mixed ionic-electronic conducting (MIEC) materials, based on the ABO 3 perovskite structure. Their material properties can be flexibly customized, giving solid solutions with high ionic-electronic conductivity and hence good transport properties. More specifically, La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) has become established as the stateof-the-art SOFC cathode, while Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) has presented outstanding oxygen permeation flux in its cubic phase. 1-3The surface-exchange coefficient (k) and the oxygen diffusion coefficient (D) provide key information about the oxygen transport mechanism that dominates the cathodic ORR. Many publications have assessed the D and k values of MIEC materials, most commonly by; electrical conductivity relaxation (ECR) measurements for dense bulks [4][5][6][7][8] and temperature for LSCF cathodes. 17 Here it should be pointed out that the well-known ALS model can only be applied if the measured impedance shows a Gerischer impedance, which indicates tha...

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confidence: 92%

“…The contribution of the different processes was quantified by CNLS fitting of the impedance spectra and the DRT curves to a meaningful electrical equivalent circuit. Specifically, a very low cathode specific resistance of 47.8 m cm 2 at 600…”

Section: Discussionmentioning

confidence: 99%

Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

Almar

Szász

Weber

et al. 2017

J. Electrochem. Soc.

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show abstract

“…O 2 leakages in the range of 2-5% [21][22][23] have been detected by using gold paste; an error of 10% is claimed due to leakage detection by other authors [24]. An impermeable gold coating layer of about 270 mm length has been applied on hollow fiber membranes to avoid the use of additional high temperature sealants [25].…”

Section: The Sealing System and Proceduresmentioning

confidence: 99%

New high temperature sealing technique and permeability data for hollow fiber BSCF perovskite membranes

Felice

Middelkoop

Anzoletti

et al. 2016

Chemical Engineering and Processing - Process Intensification

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“…These latter phases are among the most promising oxygen permeable membrane materials [8][9][10][11][12], with very high oxygen transport rates related to the high concentrations of mobile oxygen vacancies at elevated temperatures. However, cubic BSCF is a metastable compound at SOFC operating temperatures, and gradually transforms to a hexagonal perovskite that is detrimental to applications incorporating BSCF [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of oxyanion-doped barium strontium cobalt ferrites: Stabilization of the cubic perovskite and enhancement in conductivity

Porras-Vázquez

Slater

2012

Journal of Power Sources

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Performance of functional perovskite membranes for oxygen production

Cited by 163 publications

References 22 publications

Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

New high temperature sealing technique and permeability data for hollow fiber BSCF perovskite membranes

Synthesis of oxyanion-doped barium strontium cobalt ferrites: Stabilization of the cubic perovskite and enhancement in conductivity

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