Quantitative contribution of resistance sources of components to stack performance for solid oxide electrolysis cells

Zheng, Yifeng; Liu, Qingshan; Chen, Tao; Xu, Cheng; Wang, Wei Guo

doi:10.1016/j.jpowsour.2014.10.096

Cited by 24 publications

(12 citation statements)

References 18 publications

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“…Degradation phenomena must also be identified, understood and eliminated or reduced. Over the last few years, some reports on solid oxide electrolysis stacks have been published (1)(2)(3)(4)(5)(6)(7)(8)(9). To our knowledge, only a limited number of studies on the detailed post analysis of a stack have been published so far.…”

Section: Introductionmentioning

confidence: 99%

“…Over the last few years, some reports on solid oxide electrolysis stacks have been published. [1][2][3][4][5][6][7][8][9] To our knowledge, only a limited number of studies on the detailed post analysis of a stack have been published so far. In 2017, Rinaldi et al 10 published test results of an electrolysis stack, which was tested for 10 700 h at −0.5 A • cm −2 with a degradation rate of 0.5% kh −1 .…”

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confidence: 99%

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A Detailed Post Mortem Analysis of Solid Oxide Electrolyzer Cells after Long-Term Stack Operation

Frey

Sebold

Menzler

et al. 2018

J. Electrochem. Soc.

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A long-term test with a two-layer solid oxide electrolyzer stack was carried out for more than 20 000 hours. The stack was mainly operated in a furnace environment in electrolysis mode, with 50% humidification of H2 at 800 °C, a current density of -0.5 Acm -2 and steam conversion rate of 50%. After ~18 000 hours of operation in electrolysis mode, the voltage and area specific resistance degradation rates were ~0.6%/kh and 8.2%/kh, respectively. A detailed post mortem analysis of cells including ICP-OES and microstructural analysis was conducted. Two main degradation phenomena were observed in the cells: In the fuel electrode, the depletion and agglomeration of nickel were visible. At the air electrode, demixing of the air electrode and diffusion of strontium took place. This was observed in the formation of strontium zirconate at the interface between the electrolyte and the GDC barrier layer as well as in the formation of strontium oxide and strontium chromate on top of the cells. Strontium oxide was even found in pores on top of the electrolyte.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

A Detailed Post Mortem Analysis of Solid Oxide Electrolyzer Cells after Long-Term Stack Operation

Frey

Sebold

Menzler

et al. 2018

J. Electrochem. Soc.

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show abstract

“…Figure 7 shows the characteristic electrochemical values of the 12 stack repeat units, specifically OCVs, electrolysis voltages and area specific resistances (ASR), at 70% steam conversion rate which were extracted from the jV-behavior of Figure 6. of other research groups [20,21]. However, in contrast to the OCV, higher differences in the electrolysis voltages and in the ASRs of the RUs can be observed.…”

Section: Solar Steam Generationmentioning

confidence: 74%

Solar heat integrated solid oxide steam electrolysis for highly efficient hydrogen production

Schiller

Lang

Szabo

et al. 2019

Journal of Power Sources

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Water electrolysis is considered as a suitable pathway for the production of large amounts of hydrogen to be used as energy carrier for electricity storage. Among the existing water electrolysis technologies solid oxide steam electrolysis exhibits the highest electrical efficiency. Moreover, from thermodynamic considerations the efficiency can be further increased when part of the energy demand is provided by the integration of external high temperature heat to reduce the electrical energy for the water splitting reaction. This paper reports on the successful integration of solar heat into a solid oxide electrolyzer. The experimental setup of the prototype system consisting of a solar simulator, a solar steam generator, a steam accumulator and a solid oxide electrolyzer as well as first results with regard to solar steam

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“…This value is slightly smaller compared to the measured ones in Figure 8 which can be explained by the assumption of ideal interfaces between the different layers of the components of the repeat unit. However, post-test analysis of stacks operated in SOFC at DLR 39 and results of other research groups 40 have shown that especially the electrical contact of the air electrode may contain additional ohmic contributions. In this context the material and structure of the air electrode contact paste can play an important role.…”

Section: Electrochemical Impedance Spectroscopy-mentioning

confidence: 97%

Electrochemical Quality Assurance of Solid Oxide Electrolyser (SOEC) Stacks

Lang

Bohn

Couturier

et al. 2019

J. Electrochem. Soc.

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Quantitative contribution of resistance sources of components to stack performance for solid oxide electrolysis cells

Cited by 24 publications

References 18 publications

A Detailed Post Mortem Analysis of Solid Oxide Electrolyzer Cells after Long-Term Stack Operation

A Detailed Post Mortem Analysis of Solid Oxide Electrolyzer Cells after Long-Term Stack Operation

Solar heat integrated solid oxide steam electrolysis for highly efficient hydrogen production

Electrochemical Quality Assurance of Solid Oxide Electrolyser (SOEC) Stacks

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