Accelerated degradation for solid oxide electrolysers: Analysis and prediction of performance for varying operating environments

Königshofer, Benjamin; Höber, Michael; Nusev, Gjorgji; Boškoski, Pavle; Hochenauer, Christoph; Subotić, Vanja

doi:10.1016/j.jpowsour.2022.230982

Cited by 17 publications

(6 citation statements)

References 52 publications

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“…Regarding long‐term steam electrolysis tests, we compare a commercial anode‐supported cell (ASC) with an LSC air electrode (Elcogen AS) with the ASC utilizing the HEP LPNSSC air electrode. Test conditions are the same for both cells and chosen in analogy to published research [41]. Constant current densities of ‒0.938 A/cm 2 are applied at 800°C during the entire test, while the change of cell voltage is observed, as shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Pretschuh,

Egger,

Brunner

et al. 2023

Fuel Cells

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Strontium segregation (coupled to phase decomposition and impurity poisoning) and electrode delamination are two of the most important degradation mechanisms currently limiting the long‐term stability of solid oxide fuel cell and electrolysis cell (SOFC and SOEC) air electrodes. The present study aims to demonstrate that air electrodes made of entropy‐stabilized multi‐component oxides can mitigate these degradation mechanisms while providing excellent cell performance. A SOEC utilizing La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ (LPNSSC) as an air electrode delivers −1.56 A/cm2 at 1.2 V at 800°C. This performance exceeds that of a commercial cell with La0.6Sr0.4CoO3‐δ (LSC) air electrode, which reaches −1.43 A/cm2. In a long‐term electrolysis test, the LPNSSC cell shows stable performance during 700 h, while the LSC cell degrades continuously. Post‐mortem analyses by scanning electron microscopy‐energy dispersive X‐ray spectroscopy indicate complete delamination of the LSC electrode, while LPNSSC shows excellent adhesion. The amount of secondary phases formed (esp. SrSO4) is also much lower in LPNSSC compared to LSC. In conclusion, the high‐entropy perovskite LPNSSC is a promising option for air electrodes of solid oxide cells. While LPNSSC can compete with ‒ or even outperform ‒ LSC air electrodes in terms of electrochemical performance, it could be particularly advantageous in terms of long‐term stability in SOEC mode.

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Section: Resultsmentioning

confidence: 99%

Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Pretschuh,

Egger,

Brunner

et al. 2023

Fuel Cells

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“…210 To prevent the undesirable deactivation of oxygen electrodes during operation in the SOEC mode, the working current and voltage should both be regulated to not exceed critical values. 312 With decreasing temperature, the ohmic resistance and activation overvoltage increase, which substantially affects the SOEC performance. Additionally, considerably higher degradation rates have been reported at higher current densities and lower operating temperatures.…”

Section: Degradation Of Oxygen Electrodesmentioning

confidence: 99%

“…With decreasing temperature, the ohmic resistance and activation overvoltage increase, which substantially affects the SOEC performance. Additionally, considerably higher degradation rates have been reported at higher current densities and lower operating temperatures . Interestingly, operation in the SOFC mode suppresses the electrode degradation induced during operation in the SOEC mode. ,− To explain this surprising result, Hughes et al hypothesized that shortened cycling may interrupt some unfavorable incubations (e.g., oxygen-bubble formation, cation migration, and zirconate-phase nucleation), which subsequently interrupt degradation.…”

Section: Stability: Bundled and Stacked Cellsmentioning

confidence: 99%

Syngas Production from CO₂ and H₂O via Solid-Oxide Electrolyzer Cells: Fundamentals, Materials, Degradation, Operating Conditions, and Applications

Hou,

Jiang,

Wei

et al. 2024

Chem. Rev.

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Highly efficient coelectrolysis of CO 2 /H 2 O into syngas (a mixture of CO/ H 2 ), and subsequent syngas conversion to fuels and value-added chemicals, is one of the most promising alternatives to reach the corner of zero carbon strategy and renewable electricity storage. This research reviews the current state-of-the-art advancements in the coelectrolysis of CO 2 /H 2 O in solid oxide electrolyzer cells (SOECs) to produce the important syngas intermediate. The overviews of the latest research on the operating principles and thermodynamic and kinetic models are included for both oxygen-ion-and proton-conducting SOECs. The advanced materials that have recently been developed for both types of SOECs are summarized. It later elucidates the necessity and possibility of regulating the syngas ratios (H 2 :CO) via changing the operating conditions, including temperature, inlet gas composition, flow rate, applied voltage or current, and pressure. In addition, the sustainability and widespread application of SOEC technology for the conversion of syngas is highlighted. Finally, the challenges and the future research directions in this field are addressed. This review will appeal to scientists working on renewable-energy-conversion technologies, CO 2 utilization, and SOEC applications. The implementation of the technologies introduced in this review offers solutions to climate change and renewable-power-storage problems.

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“…437 Fe-Cr alloys such as Crofer22APU, Crofer22H, SUS 430, and similar metals are more ductile than nearly pure Cr-based alloys like Cr5FeY 2 O 3 , but both types show great promise as interconnect materials in stacks due to their optimized thermal expansion coefficient (Fe-Cr alloys for FESCs and Cr alloys for ESCs) and easy processing methods. 438 While the Cr alloys form pure Cr 2 O 3 scales under both oxidizing and reducing conditions, Fe-Cr alloysdeveloped especially for SOFC useform an oxide double layer (e.g., Crofer types). This double layer consists of an inner pure chromia scale and an outer Cr-Mn spinel layer.…”

Section: Further Stack Componentsmentioning

confidence: 99%

Solid oxide electrolysis cells – current material development and industrial application

Wolf,

Winterhalder,

Vibhu

et al. 2023

J. Mater. Chem. A

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Accelerated degradation for solid oxide electrolysers: Analysis and prediction of performance for varying operating environments

Cited by 17 publications

References 52 publications

Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Syngas Production from CO₂ and H₂O via Solid-Oxide Electrolyzer Cells: Fundamentals, Materials, Degradation, Operating Conditions, and Applications

Solid oxide electrolysis cells – current material development and industrial application

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Accelerated degradation for solid oxide electrolysers: Analysis and prediction of performance for varying operating environments

Cited by 17 publications

References 52 publications

Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes

Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes

Syngas Production from CO2 and H2O via Solid-Oxide Electrolyzer Cells: Fundamentals, Materials, Degradation, Operating Conditions, and Applications

Solid oxide electrolysis cells – current material development and industrial application

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Product

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Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Electrochemical and microstructural characterization of the high‐entropy perovskite La_0.2Pr_0.2Nd_0.2Sm_0.2Sr_0.2CoO_3‐δ for solid oxide cell air electrodes

Syngas Production from CO₂ and H₂O via Solid-Oxide Electrolyzer Cells: Fundamentals, Materials, Degradation, Operating Conditions, and Applications