Design and optimization of porous ceramic supports for asymmetric ceria-based oxygen transport membranes

Kaiser, Andreas; Foghmoes, Søren Preben Vagn; Pećanac, G.; Malzbender, Jürgen; Chatzichristodoulou, Christodoulos; Glasscock, Julie; Ramachandran, Dhavanesan Kothanda; Ni, De Wei; Esposito, Vincenzo; Søgaard, Martin; Hendriksen, Peter Vang

doi:10.1016/j.memsci.2016.04.016

Cited by 31 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured permeabilities found are 3.77 × 10 −14 m 2 for the bi‐layered supports and 3.05 × 10 −14 m 2 for the single‐layered substrate. For comparison purposes, permeabilities of different coatings fabricated by plasma spraying and a support fabricated by tape casting as well as an anode support fabricated by combustion synthesis are presented in Table . Permeabilities of electrolyte coatings found in the literature are included in Table to provide a better picture of the magnitude of the permeability in cases where mostly dense but non‐defect free coatings are fabricated.…”

Section: Resultsmentioning

confidence: 99%

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Arevalo-Quintero

Kesler

2018

Fuel Cells

View full text Add to dashboard Cite

Metal‐supported solid oxide fuel cells have several advantages, which could potentially increase the overall competitiveness of the technology, compared to their cermet‐supported counterparts. However, surface imperfections and rapid oxidation of the metal supports at operating temperatures are factors that affect the electrochemical performance and durability of the cells. In this study, we have developed bi‐layer metal supports consisting of a thin, finely structured top layer and a thicker, more coarsely structured bottom layer. The fine top layer has small surface pore sizes which facilitate the deposition of defect‐free electrolyte layers, while the coarse layer provides greater open porosity and larger pore sizes to facilitate mass transport and to decrease the rate of oxidation. An open circuit voltage (OCV) as high as 1.105 V at 750 °C in 3% humidified hydrogen is reported in this study, which deviates from the Nernst potential by only 5 mV. This result shows that the bi‐layer support has the potential to minimize electrode and electrolyte defects, which are known to be detrimental to cell performance. In addition, the bi‐layer supports show better oxidation resistance compared to benchmark finely‐structured single‐layer supports fabricated in this study for comparison.

show abstract

Section: Resultsmentioning

confidence: 99%

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Arevalo-Quintero

Kesler

2018

Fuel Cells

View full text Add to dashboard Cite

show abstract

“…Such porous support layers can be several orders of magnitude thicker compared to the functional electrode and electrolyte layers (Tsai and Schmidt, 2011). Their mechanical strength is adjusted by altering either the microstructural properties, such as the porosity (Chen et al, 2015;Kaiser et al, 2016), or the thickness of the support layer. However, modifying these parameters can influence the mass transport behaviour and hence, the performance of the device.…”

Section: Introductionmentioning

confidence: 99%

Contradictory concepts in tortuosity determination in porous media in electrochemical devices

Tjaden

Finegan

Lane³

et al. 2017

Chemical Engineering Science

View full text Add to dashboard Cite

Porous media are a vital component in almost every electrochemical device in the form of electrode, support or gas diffusion layers. Microstructural parameters of porous layers such as tortuosity, porosity and pore size diameter are of high importance and crucial for diffusive mass transport calculations. Among these parameters, the tortuosity remains ill-defined in the field of electrochemistry, resulting in a wide range of different calculation approaches. Here, we present a systematic approach of calculating the tortuosity of different porous samples using image and diffusion cell experimental-based methods. Image-based analyses include a selection of geometric and flux-based tortuosity calculation algorithms. Differences between the image and diffusion cell-based results are encountered and attributed to the small pore diameters and thereby induced Knudsen effects within the samples which govern the diffusion flux. Highlights Microstructural analysis of oxygen transport membrane porous supports.  Correlative tortuosity determinations via X-ray tomography and diffusion cell experiments.  Evaluation of the effect of tortuosity, porosity and sample thickness on diffusion resistance.  Visible differences between different tortuosity calculation approaches are encountered.  Diffusion cell experiments yield the highest and geometric-based image quantification algorithms result in the lowest tortuosity values.

show abstract

“…The required support gas permeability depends highly on the membrane material and operation conditions, 10 but as a general guideline for a 1 mm thick support the Darcy permeability coefficient k should exceed 10 -14 m 2 . The gas permeability depends on the volume fraction of porosity (ϕ) and the pore diameter (Dp):…”

mentioning

confidence: 99%

Graphite and PMMA as pore formers for thermoplastic extrusion of porous 3Y-TZP oxygen transport membrane supports

Haugen

Gurauskis

Kaiser

et al. 2017

Journal of the European Ceramic Society

View full text Add to dashboard Cite

A gas permeable porous support is a crucial part of an asymmetric oxygen transport membrane (OTM). Here, we develop feedstocks for thermoplastic extrusion of tubular, porous 3Y-TZP (partially stabilized zirconia polycrystals, (Y2O3)0.03(ZrO2)0.97)) ceramics, using graphite and/or polymethyl methacrylate (PMMA) as pore formers. The influence of pore former content and type, 3Y-TZP particle size and support sintering temperature on the microstructure, porosity and gas permeability were studied. Using at least 40 vol% pore former, consisting of graphite and PMMA in the volume ratio 2:1, tubes with gas permeability exceeding the target of 10 -14 m 2 are obtained. In the temperature range 1250-1400°C the support gas permeability is insensitive to the sintering temperature, and the feedstocks shrink more than 15 % during sintering, making them ideal for cosintering with functional OTM layers. This demonstrates the suitability of thermoplastic extrusion for fabrication of porous 3Y-TZP OTM supports, or for other technologies requiring porous ceramics.

show abstract

Design and optimization of porous ceramic supports for asymmetric ceria-based oxygen transport membranes

Cited by 31 publications

References 28 publications

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Contradictory concepts in tortuosity determination in porous media in electrochemical devices

Graphite and PMMA as pore formers for thermoplastic extrusion of porous 3Y-TZP oxygen transport membrane supports

Contact Info

Product

Resources

About