Electrochemical characterization of a CFY-stack with planar electrolyte-supported solid oxide cells in rSOC operation

Preininger, Michael; Subotić, Vanja; Schauperl, Richard; Reichholf, David; Kusnezoff, Mihails; Hochenauer, Christoph

doi:10.1016/j.ijhydene.2018.04.230

Cited by 18 publications

(13 citation statements)

References 63 publications

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“…Because of the high flow rate of air, gas concentration/transport impedances at the air electrode are negligible. These impedance results are in good agreement with the results of other research groups [8,10,13,14,24,35,37]. In this context it has to be mentioned, that the EIS spectra strongly depend on materials and geometries of the cells/stacks as well as on the operating conditions, which can complicate the reliable interpretation of the EIS data [38].…”

Section: Eis Spectra In Soec and Sofc Mode During Long-term Operationssupporting

confidence: 88%

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Long‐Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack▴

et al. 2020

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The successful market introduction of the solid oxide fuel/ electrolysis cell technology for power-togas applications requires the reduction of the degradation rates and the better understanding of the degradation mechanisms of the stacks. Therefore, the paper reports and compares the long-term behavior of a solid oxide cell stack in electrolysis and reversible fuel cell/electrolysis operation. The 30-cell stack with electrolyte supported cells was supplied by Sunfire GmbH (Dresden/Germany) in the German funded RSOC Project. The stack was operated for 3,370 h in electrolysis and afterwards for 2,500 h in reversible fuel cell/electrolysis mode, each at 70% gas conversion. In the beginning of the test, the stack showed high gas tightness, good performances and high efficiencies in both SOEC and SOFC operations. During 3,370 h of SOEC operation a low degradation of +0.5%/ 1,000 h was measured. During 2,500 h of reversible fuel cell/ electrolysis cycling, the gas tightness of the stack slightly decreased, which led to a temperature increase, and higher degradation rates were observed. The increase of the ohmic resistance contributed mostly to the degradation. Optimized operating conditions for reversible cycling and increasing the purity of the supplied water are foreseen in order to minimize stack degradation in reversible operation.

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Section: Eis Spectra In Soec and Sofc Mode During Long-term Operationssupporting

confidence: 88%

“…170 mW cm −2 with an electrical efficiency of 44%. These values are in the same range or even higher compared to literature data 10, 24, 32. Moreover, the performance of the 30 RUs of the stack was almost homogeneous.…”

Section: Resultssupporting

confidence: 71%

Long‐Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack▴

et al. 2020

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“…Regarding planar configuration, two types are preferred: electrode (mainly at anode) supported cells and electrolyte supported cells [3,15,16]. Although electrolyte supported cells may exhibit higher ohmic losses, they are more robust and have demonstrated much better stability during the reduction-oxidation processes and thermal cycles [17,18].…”

Section: Introductionmentioning

confidence: 99%

SOFC cathodic layers using wet powder spraying technique with self synthesized nanopowders

Wain-Martin

Morán-Ruiz

Laguna‐Bercero

et al. 2019

International Journal of Hydrogen Energy

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Available online xxxKeywords: SOFC Wet powder spray Cathode Active layers Ball milling a b s t r a c t sIn this work, a wet powder spraying method has been investigated as a facile low cost route to deposit electrode layer on SOFC electrolyte support. A particular focus has been examining the interfacial stability of the deposited layers, and determining the influence of the thickness of the different layers, as well as the ball milling regime used to produce the electrode inks.The developed system consist of an yttria stabilized zirconia electrolyte support, a La 0.6 Sr 0.4 FeO 3 (LSF) cathode, a Sm 0.2 Ce 0.8 O 1.9 (SDC) barrier layer between the electrolyte and the cathode, and LaNi 0.6 Fe 0.4 O 3 (LNF) as a contact layer, for a future integration with the SOFC interconnector. The electrolyte supports (300 mm thickness and 9 mm diameter) supports were prepared by uniaxial pressing, while the deposition of thin barrier layers, cathode and contact layer were carried out by manual spray coating.Please cite this article as: Wain-Martin A et al., SOFC cathodic layers using wet powder spraying technique with self synthesized nanopowders, International Journal of Hydrogen Energy, https://doi.

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“…An rSOFC produces electricity with low emissions and in a sustainable process when it is fueled by hydrogen. It can also be used to produce syngas in the reversible mode as an electrolysis cell and to obtain hydrocarbon fuel in further processes, such as the Fischer‐Tropsch process, which is applicable in improving the quality of intermittent power supply and meeting the requirement of new energy resources . However, the limitations of pure hydrogen fuel are also obvious due to high‐cost storage and transportation, which are major barriers to the economic advancement of rSOFCs.…”

Section: Introductionmentioning

confidence: 99%

“…It can also be used to produce syngas in the reversible mode as an electrolysis cell and to obtain hydrocarbon fuel in further processes, such as the Fischer-Tropsch process, which is applicable in improving the quality of intermittent power supply and meeting the requirement of new energy resources. [1][2][3] However, the limitations of pure hydrogen fuel are also obvious due to high-cost storage and transportation, which are major barriers to the economic advancement of rSOFCs. Due to the advantages of high-temperature working conditions, syngas catalyzed by nonnoble metals (eg, nickel) is appropriate to avoid the limitations of pure hydrogen.…”

Section: Introductionmentioning

confidence: 99%

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

et al. 2018

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Summary Reversible solid oxide fuel cells (rSOFCs) may be applied to store and generate electrical energy in a reversible mode. This technique is promising to balance the conflict between intermittent power supply and demand in a sustainable way. One of the limitations of the development of rSOFCs is the high cost of storage and usage of pure H2, which may be solved by employing syngas as the fuel. The performance of rSOFCs depends on the development of bifunctional materials, cell design, and operation optimization, which are often investigated and predicted by the cost‐effective approach of mathematical modeling. However, the modeling of dual‐mode rSOFCs involving co‐redox reactions with syngas is not well developed. In this study, a two‐dimensional (2D) single‐channel model of an rSOFC is developed. The novelty of this model is that the multiphysics transport processes are fully coupled and solved with the reversible water‐gas shift reaction with syngas and the electrochemical reactions. The effects of the operating conditions and design parameters (eg, electrode thickness) are considered, with the aim of providing guidelines to optimize the design and operation of reversible cells. It is concluded that the thickness of the electrode has a larger impact on the water‐gas shift reaction than on the electrochemical reaction in both the gas diffusion and reaction regions. The C/H element ratio of syngas has a negative correlation with power output, but the distributions of current and gas species may be improved in both modes. A higher operating temperature improves the performance in both modes but has a more substantial effect in the electrolysis mode. The specific design and operating schemes favored in different modes should be balanced in the reversible mode.

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Electrochemical characterization of a CFY-stack with planar electrolyte-supported solid oxide cells in rSOC operation

Cited by 18 publications

References 63 publications

Long‐Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack▴

Long‐Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack▴

SOFC cathodic layers using wet powder spraying technique with self synthesized nanopowders

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

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