Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application

Preininger, Michael; Subotić, Vanja; Mittmann, Frank; Hochenauer, Christoph

doi:10.1016/j.apenergy.2019.113695

Cited by 29 publications

(11 citation statements)

References 70 publications

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“…Along the cell length, gas channels within the fuel electrode and air electrode compartment distribute the media in co-flow condition. More details about the stack configuration with modeling and experimental results of the temperature distribution along and across the stack and its repeating units can be found elsewhere [24][25][26]. During the experiments the oxygen electrodes of each stack were flushed with 1 slpm per cell air to prevent the accumulation of pure oxygen with its corrosive characteristic in the outlet pipes of the testing facility.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

2020

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In this study three identically constructed ten-layer stacks with electrolyte supported cells were tested in exothermic steam and co-electrolysis mode at elevated pressures of 1.4 and 8 bar. Investigations during constant-current operation at a current density of-0.5 A cm-2 and a reactant conversion of 70% over 1,000-2,000 h were carried out. The inlet gas composition for steam electrolysis was 90/10 (H 2 O/H 2) and 63.7/31.3/3.3/1.7 (H 2 O/CO 2 /H 2 /CO) for co-electrolysis operation. All stacks showed highly similar resistances at the beginning of the tests indicating a high level of accuracy and repeatability during manufacturing. The stack operated in steam electrolysis mode at 1.4 bar showed comparably low degradation of 8 mV kh-1 cell-1 , whereas the stack operated at 8 bar showed an approximately four times higher degradation. The third stack was operated in co-electrolysis mode at 1.4 and 8 bar and showed noticeably higher degradation rates than during steam electrolysis mode. The predominant increase of the ohmic resistance during operation was identified to be mainly responsible for the observed degradation of all three stacks, whereas the increase of the polarization resistances played a subordinate role. Within the post-test analysis, noticeably high nickel depletion was observed for the stack operated at the highest pressure in steam electrolysis mode. Furthermore, partial delamination of electrodes was observed. The degradation is discussed with relation to phenomena and experimental parameters during operation.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

2020

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“…This value lies in the same order of magnitude (being lower) as the one reported for an ESC reference with a Ni-CGO fuel electrode tested in coelectrolysis (25% H 2 , 25% H 2 O, 25% CO 2 , 25% CO) at 830 C which showed an ASR DC_Total of 0.84 U cm 2 at À0.3 A cm À2 . 58 Even though these conditions are not directly comparable, this rst approach suggests promising performance of the L65SCrN electrocatalyst as a fuel electrode. The polarization curve shows a linear evolution from OCV until the thermoneutral voltage of co-electrolysis that is determined under the tested conditions to $1.32 V lying between the steam electrolysis value (1.29 V) and CO 2 electrolysis (1.46 V).…”

Section: Performance Evaluation In Fc Fc-ec and Ec Operationmentioning

confidence: 96%

A-site deficient chromite with in situ Ni exsolution as a fuel electrode for solid oxide cells (SOCs)

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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Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application

Cited by 29 publications

References 70 publications

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

Investigation of the Long‐term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co‐electrolysis Mode

A-site deficient chromite with in situ Ni exsolution as a fuel electrode for solid oxide cells (SOCs)

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

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