Progress in Stack Power Density Using the SOFCONNEX™
                                                Concept

Diethelm, Stefan; Tagliaferri, Enrico; Ihringer, Raphaël; Molinelli, Michele; Autissier, Nordahl; Larrain, Diego; Wuillemin, Zacharie; Thorn, Emily; Blanc, C.; Prosperi, Gabriele; Bucheli, Olivier; Closset, Alexandre; herle, Jan Van

doi:10.1149/200507.0147pv

Cited by 2 publications

(1 citation statement)

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“…During sintering (1320-1400°C), the cells shrink homogeneously, which allows for cutting out directly the green body with the right dimensions. Thin (5-30 µm) NiO-8YSZ (55:45 wt) anode functional layer (AFL) and stabilized zirconia electrolytes (5-15 µm) are deposited by screen printing on the green anode substrate (0.3-1.2 mm) and co-fired at 1320-1400°C (4). By this way, robust and porous half cells with surface area of 10 to 120 cm 2 and thickness of 0.3 to 1.2 mm are fabricated as presented in figure 1.…”

Section: Cell Fabricationmentioning

confidence: 99%

2R-Cell{trade mark, serif}: Reliability of Anode Supported Thin Electrolyte Upon Multi Thermo and Redox Cycles

Ihringer¹

2009

ECS Trans.

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Because of their high power density in a wide range of temperature, anode supported thin film electrolytes are now a days the most used cells in the SOFC area. Unfortunately, the latter suffers from an important problem that remained unsolved till today: they are totally destroyed when re-oxidation occurs in the anode chamber. This happens, for instance, when fuel supply inappropriately stops. Cell peripheral re-oxidation is another well known figure where failures are initiated. In all cases, when reoxidation starts, the stack quickly undergoes a fatal destruction and the SOFC system definitely fails. Fiaxell Sàrl, a new company active in the SOFC area has developed, with the standard NiOZrO 2 material, a novel anode supported thin electrolyte, the 2R-Cell™ that provides robustness and reliability upon multi thermo and redox-cycles. Such cells have now demonstrated for thousands of cumulated hours that they withstand full redox-cycles without any failure in the anode substrate or in the thin. This paper presents the electrochemical behaviour of such cells, tested over 1000 hours with 13 full redox cycles and 3 quick 250°C/h thermal-cycles. The different EC tests (button cell or stack) reported in this paper clearly show that the 2R-Cell™ is the candidate of choice to equip fuel cell devices and systems that need an easy stack operation and especially reliability.

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Section: Cell Fabricationmentioning

confidence: 99%

2R-Cell{trade mark, serif}: Reliability of Anode Supported Thin Electrolyte Upon Multi Thermo and Redox Cycles

Ihringer¹

2009

ECS Trans.

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Modeling and Study of the Influence of Sealing on a Solid Oxide Fuel Cell

Wuillemin

Autissier

Nakajo

et al. 2008

Journal of Fuel Cell Science and Technology

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The properties of sealing materials are important for the performance and reliability of solid oxide fuel cells (SOFCs). Even if the properties of a sealing material can be studied separately, it remains difficult to quantify the effect of an imperfect seal on the repeat-element behavior. In this study, simulation is used to investigate the effects of an imperfect seal behavior on the performance and reliability of SOFCs. Diffusion through the sealing material and inherent local combustion of fuel are added to the computational fluid dynamics (CFD) repeat-element model, which also allows us to compute the flow field, the electrochemical reactions, and the energy equations. The results are in good agreement with experiments. The zones of parasitic combustion and local overheating are well reproduced. Furthermore, the model predicts a risk of reoxidation under polarization that is well observed. The model also shows the necessity to take into account the diffusion transport for the development of compressive seal materials, hence verifying the hypotheses made by other groups. The modeling approach presented here, which includes the imperfections of components, allows us to reproduce experiments with good accuracy and gives a better understanding of degradation processes. With its reasonable computational cost, it is a powerful tool for a design of SOFC based on reliability.

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Progress in Stack Power Density Using the SOFCONNEX™ Concept

Cited by 2 publications

References 0 publications

2R-Cell{trade mark, serif}: Reliability of Anode Supported Thin Electrolyte Upon Multi Thermo and Redox Cycles

2R-Cell{trade mark, serif}: Reliability of Anode Supported Thin Electrolyte Upon Multi Thermo and Redox Cycles

Modeling and Study of the Influence of Sealing on a Solid Oxide Fuel Cell

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