Performance assessment and evaluation of SOC stacks designed for application in a reversible operated 150 kW rSOC power plant

Königshofer, Benjamin; Boškoski, Pavle; Nusev, Gjorgji; Koroschetz, Markus; Hochfellner, Martin; Schwaiger, Marcel; Juričić, Đani; Hochenauer, Christoph; Subotić, Vanja

doi:10.1016/j.apenergy.2020.116372

Cited by 23 publications

(7 citation statements)

References 56 publications

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“…This was interpreted to be the result of the high steam partial pressures negatively impacting the surface process resistance since minor amounts of steam can be adsorbed in entry areas of the cells according to (7). Nevertheless, the effect of different temperature distributions within the stack must be considered as described in (4,8). The low-frequency DRT peak (LFP) presented a clear trend towards lower frequencies and higher amplitudes with decreasing hydrogen flow.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is always advisable to test potentially critical operating environments on single stack units before applying them to large-scale industrial modules. This not only provides insight into the processes taking place, but also allows strategies to be proposed for safe and stable operation and optimization without damaging the industrial modules (4).…”

Section: Introductionmentioning

confidence: 99%

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Performance Investigation and Optimization of a SOEC Stack Operated Under Industrially Relevant Conditions

et al. 2021

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Solid oxide electrolysis cells (SOEC) are a highly efficient technology for producing green hydrogen using only steam and electricity from renewable sources. However, different applications and associated operating conditions can lead to performance deterioration and microstructural degradation of SOECs. In this context, different factors such as the input gas composition, the operating temperature, or the applied current profile can have significantly different effects on the performance and long-term stability of the technology. In this study, various industrially relevant operating conditions were applied to a ten-cell stack to determine their impact on stack performance and electrode processes as well as to provide a solid basis for optimized operation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Investigation and Optimization of a SOEC Stack Operated Under Industrially Relevant Conditions

et al. 2021

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“…The increasing energy demand in modern society has given rise to excessive consumption of fossil fuels and uncontrolled emission of greenhouse gases, resulting in global warming and environmental balance destruction. The conversion of electrical into chemical energy by electrolyzing water is meaningful for energy storage of renewable energies [ 1 , 2 , 3 ]. Simultaneously, the produced hydrogen could be used for electricity generation.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Long-Term Stability of Vermiculite Seals for Reversible Solid Oxide Cell

et al. 2023

Molecules

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A reversible solid oxide cell (RSOC) integrating solid oxide fuel (SOFC) and a solid oxide electrolysis cell (SOEC) usually utilizes compressive seals. In this work, the vermiculite seals of various thickness and compressive load during thermal cycles and long-term operation were investigated. The leakage rates of seals were gradually increased with increasing thickness and input gas pressure. The thinner seals had good sealing performance. The compressive load was carried out at thinner seals, the possible holes were squeezed, and finally the leakage rates were lower. With a fixed input gas pressure of 1 psi, 2 psi, and 3 psi, the leakage rates of 0.50 mm vermiculite remained at around 0.009 sccm/cm, 0.017 sccm/cm and 0.028 sccm/cm during twenty thermal cycles, while the leakage rates remained at around 0.011 sccm/cm for about 240 h. Simultaneously, elemental diffusions between seals and components were limited, implying good compatibility. Furthermore, the open circuit voltage (OCV) remained at around 1.04 V during 17 thermal cycles, which is close to Nernst potentials. The stack performance confirmed that the vermiculite seals can meet the structural support and sealing requirements. Therefore, the vermiculite shows good promise for application in stacks during thermal cycles and long-term operation.

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“…Furthermore, r-SOCs can smoothly switch these two operation modes. From this viewpoint, r-SOCs are a promising green energy technology for the near future (1)(2)(3)(4). The Ni-zirconia cermet has been widely used as a conventional SOFC anode material.…”

Section: Introductionmentioning

confidence: 99%

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Yamada¹,

Tachikawa²,

Lyth³

et al. 2022

ECS Trans.

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Reversible solid oxide cells (r-SOCs) are devices that can operate efficiently in both fuel cell and electrolysis operation modes. Nickel is widely used as an anode in conventional solid oxide fuel cells (SOFCs), but this agglomerates due to redox cycling, leading to irreversible performance degradation, making it unsuitable for r-SOCs. Here, we apply alternative electrodes to r-SOCs, in which Ni-Co alloy functions as a catalyst and an electronic conductor, whilst Ce0.9Gd0.1O2 (GDC) functions as a mixed ionic-electronic conductor. The electrochemical performance of these Ni-Co-GDC electrodes and their reverse-operation durability in r-SOCs are evaluated, and the effect of varying the amount of Co is investigated, compared with conventional cermet fuel electrodes. These novel materials exhibit high electrochemical performance and durability against SOFC/SOEC reverse-operation cycling.

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Performance assessment and evaluation of SOC stacks designed for application in a reversible operated 150 kW rSOC power plant

Cited by 23 publications

References 56 publications

Performance Investigation and Optimization of a SOEC Stack Operated Under Industrially Relevant Conditions

Performance Investigation and Optimization of a SOEC Stack Operated Under Industrially Relevant Conditions

Investigation on Long-Term Stability of Vermiculite Seals for Reversible Solid Oxide Cell

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

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