Shaping of advanced asymmetric structures of proton conducting ceramic materials for SOFC and membrane-based process applications

Fontaine, Marie‐Laure; Larring, Yngve; Smith, Jens B.; Raeder, H.; Andersen, Øs; Einarsrud, Mari‐Ann; Wiik, Kjell; Bredesen, Rune

doi:10.1016/j.jeurceramsoc.2008.07.028

Cited by 13 publications

(12 citation statements)

References 14 publications

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“…142 The same technique was also used to produce a 4 mm-thick and fully dense film of BZY sintered at low temperatures (1350 1C). 143 In particular, only substrates with a large shrinkage rates at low temperatures seemed to allow dense BZY film fabrication. The large contraction of the anode during the sintering process may impose the same large shrinkage at the BZY electrolyte, favouring its densification.…”

Section: Improving the Proton Conductivity Of Barium Zirconatementioning

confidence: 99%

“…The large contraction of the anode during the sintering process may impose the same large shrinkage at the BZY electrolyte, favouring its densification. 143 A dense thin film of BZY was prepared at 1300 1C on porous substrates by solid-state reaction between a gas-tight Y-stabilized zirconia layer and a BaCO 3 coating. 144 However, the film was composed of very fine grains (o100 nm) resulting in large grain boundary resistance.…”

Section: Improving the Proton Conductivity Of Barium Zirconatementioning

confidence: 99%

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Materials challenges toward proton-conducting oxide fuel cells: a critical review

2010

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The increasing world population and the need to improve quality of life for a large percentage of human beings are the driving forces for the search for sustainable energy production systems, alternative to fossil fuel combustion. Among the various types of alternative energy production technologies, solid oxide fuel cells (SOFCs) operating at intermediate temperatures (400-700 °C) show the advantage of possible use both for stationary and mobile energy production. To reach the goal of reducing the SOFC operating temperature, proton-conducting oxides are gaining wide interest as electrolyte materials. This critical review provides a broad overview of the most recent progresses obtained tailoring the properties of proton-conducting oxides for fuel cell applications, analyzing and comparing the different strategies proposed to match high-proton conductivity with good chemical stability (170 references).

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Section: Improving the Proton Conductivity Of Barium Zirconatementioning

confidence: 99%

Section: Improving the Proton Conductivity Of Barium Zirconatementioning

confidence: 99%

Materials challenges toward proton-conducting oxide fuel cells: a critical review

2010

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“…This structural arrangement is based on the fact that slow transport kinetics in principle may be due to both contributions from bulk diffusion as well as reactions on membrane surfaces. This leads to two general strategies followed by numerous research groups [5][6][7][8][9]: 3 1. Decrease the membrane thickness below the critical thickness such that permeation rate is solely controlled by the surface exchange reactions.…”

Section: Introductionmentioning

confidence: 99%

La0.2Sr0.8Fe0.8Ta0.2O3−δ based thin film membranes with surface modification for oxygen production

2012

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High temperature dense ceramic membranes made from mixed ionic/electronic conducting perovskite ceramics represent a high potential as a reliable source for oxygen and syngas production. In this work, La 0.2 Sr 0.8 Fe 0.8 Ta 0.2 O 3- based thin film perovskite system was evaluated, addressing the effect of structural surface modification on oxygen permeation rates. Membranes with 20 µm thick dense functional layer and varying surface area on permeate side were fabricated by a dip coating technique. Oxygen permeation was measured at temperatures between 800 and 1000 C by using varying partial pressure of O 2 as a driving force. Maximum O 2 flux values of 5.8 and 8.7 mlcm -2 min -1 were recorded for smooth and structured permeation surfaces, respectively. This indicates that the surface roughness, which corresponds to an increase in surface area at the permeate side; can lead to a significant improvement in oxygen permeation rates reaching 50 % at 1000 o C.

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“…[36,37]. Ten to 26 lm-thick LaNbO 4 electrolytes were obtained by spin-or spray-coating using colloidal ceramic suspensions, and sintering at 1,350°C.…”

Section: Fabrication Of Thick Film Electrolyte-based Cellsmentioning

confidence: 99%

Development of Proton Conducting SOFCs Based on LaNbO₄ Electrolyte – Status in Norway

et al. 2010

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High temperature proton conducting solid oxide fuel cells (PC‐SOFCs) are in a developing state. Electrolytes in these cells should exhibit proton conductivity with essentially no electronic and little other ionic conductivity, as well as long‐term stability in acidic atmospheres. Acceptor substituted rare‐earth ortho‐niobates and ortho‐tantalates were recently demonstrated to exhibit proton conductivity in wet atmospheres, with a maximum of ∼10–3 S cm–1 for 1% Ca‐doped LaNbO4. This modest proton conductivity requires that the electrolyte thickness is in the micron range to reach acceptable PC‐SOFC performances. The long‐term chemical stability and a proton transference number close to unity make these materials highly interesting for high temperature fuel cell applications, in contrast to the more investigated acceptor‐doped BaCeO3 that shows instability towards acidic atmospheres. Here, we describe collaborative efforts between Norwegian partners: SINTEF, Norwegian University of Science and Technology (NTNU) and the University of Oslo for developments towards a fuel cell based on LaNbO4. This comprises identification of materials for the electrodes, interconnect and sealing, optimisation of the microstructures of all cell components, development of shaping processes and design of the fuel cell stack. We address the crucial technological issues of building and testing a PC‐SOFC stack, as well as the comprehensive fundamental understanding of all the processes involved – from fabrication and behaviour of individual components to fabrication of PC‐SOFC fuel cell stacks.

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Shaping of advanced asymmetric structures of proton conducting ceramic materials for SOFC and membrane-based process applications

Cited by 13 publications

References 14 publications

Materials challenges toward proton-conducting oxide fuel cells: a critical review

Materials challenges toward proton-conducting oxide fuel cells: a critical review

La0.2Sr0.8Fe0.8Ta0.2O3−δ based thin film membranes with surface modification for oxygen production

Development of Proton Conducting SOFCs Based on LaNbO₄ Electrolyte – Status in Norway

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Shaping of advanced asymmetric structures of proton conducting ceramic materials for SOFC and membrane-based process applications

Cited by 13 publications

References 14 publications

Materials challenges toward proton-conducting oxide fuel cells: a critical review

Materials challenges toward proton-conducting oxide fuel cells: a critical review

La0.2Sr0.8Fe0.8Ta0.2O3−δ based thin film membranes with surface modification for oxygen production

Development of Proton Conducting SOFCs Based on LaNbO4 Electrolyte – Status in Norway

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Development of Proton Conducting SOFCs Based on LaNbO₄ Electrolyte – Status in Norway