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| 001 | 1038889 | ||
| 005 | 20250219202159.0 | ||
| 020 | _ | _ | |a 978-3-95806-805-6 |
| 024 | 7 | _ | |a 10.34734/FZJ-2025-01700 |2 datacite_doi |
| 037 | _ | _ | |a FZJ-2025-01700 |
| 100 | 1 | _ | |a Winterhalder, Franziska Elisabeth |0 P:(DE-Juel1)188481 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Entwicklung alternativer Brenngaselektroden für die Hochtemperatur-Elektrolyse |f - 2025 |
| 260 | _ | _ | |a Jülich |c 2025 |b Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag |
| 300 | _ | _ | |a vii, 161 |
| 336 | 7 | _ | |a Output Types/Dissertation |2 DataCite |
| 336 | 7 | _ | |a Book |0 PUB:(DE-HGF)3 |2 PUB:(DE-HGF) |m book |
| 336 | 7 | _ | |a DISSERTATION |2 ORCID |
| 336 | 7 | _ | |a PHDTHESIS |2 BibTeX |
| 336 | 7 | _ | |a Thesis |0 2 |2 EndNote |
| 336 | 7 | _ | |a Dissertation / PhD Thesis |b phd |m phd |0 PUB:(DE-HGF)11 |s 1739950195_10491 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a doctoralThesis |2 DRIVER |
| 490 | 0 | _ | |a Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment |v 655 |
| 502 | _ | _ | |a Dissertation, RWTH Aachen University, 2024 |c RWTH Aachen University |b Dissertation |d 2024 |
| 520 | _ | _ | |a The production of hydrogen is vital for a CO2-neutral, hydrogen-based energy system, essential for achieving national and international climate goals. Solid oxide electrolysis cells (SOECs) powered by renewable energy are key to producing green hydrogen and can achieve electrical efficiencies over 100% when coupled with waste heat. However, there are challenges concerning long-term stability and cost efficiency. Current materials used in these cells degrade significantly under SOEC conditions, leading to reduced performance. In particular, the commonly used Ni-YSZ fuel electrode shows considerable degradation due to Ni agglomeration and migration. A potential solution is using alternative fuel electrodes. This study aimed to develop alternative perovskite-based fuel electrodes for steam electrolysis in SOECs. Five alternative perovskite materials were synthesized and characterized: La0.6Sr0.38Fe0.8Mn0.2O3-δ – LSFM, La0.35Sr0.63TiO3-δ – LST, Sr0.98Ti0.7Fe0.3O3-δ – STF30, Sr0.98Ti0.5Fe0.5O3-δ – STF50 and Sr1.98FeNbO6-δ – SFN. In particular, the stability under reducing conditions and the compatibility of the perovskites with 8YSZ under the production conditions of fuel electrode-supported SOECs were investigated. It was found that SFN exhibits the highest stability in a reducing atmosphere as well as low reactivity with 8YSZ under the tested conditions. Based on the results of the characterizations, SFN and STF50 were selected as fuel electrode materials for all subsequent experiments. First, the stability of the perovskites under realistic SOEC conditions was tested. The results showed that both materials can be considered chemically stable, although a small amount of Fe3O4 secondary phase formation was observed in STF50. Furthermore, the compatibility of SFN/STF50 with 8YSZ and GDC under SOEC conditions and the manufacturing conditions for electrolyte-supported cells was investigated. SFN showed no interactions with 8YSZ or GDC, while STF50 was compatible only with GDC under the tested conditions. Overall, a barrier layer between the perovskite electrode and the 8YSZ electrolyte is beneficial for preventing or reducing chemical reactions. Electrochemical measurements of cells with SFN and STF50 fuel electrodes at different temperatures (650–800 °C) and varying H2O content in the fuel gas (3–90 vol.-%) indicated that the contact layer significantly impacts resistance values. It was also observed that both the ohmic resistance (RΩ) and the polarization resistance (RPol) decrease with increasing temperature but increase with a higher water vapor content. A degradation study of a full cell with an STF50 fuel electrode and an LSCF oxygen electrode over approximately 1700 h at 800 °C in 50 vol.-% H2O + H2 and a current of i = -0.43 A∙cm-2 revealed comparatively high degradation rates of 0.195 V kh-1, 0.162 Ω∙cm2 kh-1, and 0.361 Ω∙cm2 kh-1 for voltage, RPol, and RΩ, respectively. A subsequent SEM analysis of the microstructure of the STF50 fuel electrode before and after the degradation study showed no significant changes in the electrode microstructure, except for diffused Ni particles. Whether the Ni particles that diffused from the NiO/Ni contact layer into the STF50 fuel electrode and the GDC barrier layer have an impact on the cell's performance cannot be confirmed or ruled out at the current stage. In addition to producing electrolyte-supported cells, the integration of STF50 and SFN into the manufacturing route for fuel electrode-supported cells (FESCs) was investigated. Planar half-cells with STF50 fuel electrodes were successfully produced, though they did not meet the required gas tightness. In general, integrating perovskite-based alternative fuel electrodes into the FESC manufacturing process is not feasible without modifications. In summary, this work demonstrates that STF50 and SFN have considerable potential as alternative fuel electrodes in steam SOECs. Although they exhibit a certain degree of stability and, in the case of STF50, sufficient baseline performance, further optimizations and long-term studies are necessary to establish these materials as potential replacements for Ni-YSZ fuel electrodes. |
| 536 | _ | _ | |a 1231 - Electrochemistry for Hydrogen (POF4-123) |0 G:(DE-HGF)POF4-1231 |c POF4-123 |f POF IV |x 0 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/1038889/files/Energie_Umwelt_655.pdf |y OpenAccess |
| 909 | C | O | |o oai:juser.fz-juelich.de:1038889 |p openaire |p open_access |p VDB |p driver |p dnbdelivery |
| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 0 |6 P:(DE-Juel1)188481 |
| 913 | 1 | _ | |a DE-HGF |b Forschungsbereich Energie |l Materialien und Technologien für die Energiewende (MTET) |1 G:(DE-HGF)POF4-120 |0 G:(DE-HGF)POF4-123 |3 G:(DE-HGF)POF4 |2 G:(DE-HGF)POF4-100 |4 G:(DE-HGF)POF |v Chemische Energieträger |9 G:(DE-HGF)POF4-1231 |x 0 |
| 914 | 1 | _ | |y 2025 |
| 915 | _ | _ | |a OpenAccess |0 StatID:(DE-HGF)0510 |2 StatID |
| 915 | _ | _ | |a Creative Commons Attribution CC BY 4.0 |0 LIC:(DE-HGF)CCBY4 |2 HGFVOC |
| 920 | _ | _ | |l yes |
| 920 | 1 | _ | |0 I:(DE-Juel1)IMD-2-20101013 |k IMD-2 |l Werkstoffsynthese und Herstellungsverfahren |x 0 |
| 980 | _ | _ | |a phd |
| 980 | _ | _ | |a VDB |
| 980 | _ | _ | |a UNRESTRICTED |
| 980 | _ | _ | |a book |
| 980 | _ | _ | |a I:(DE-Juel1)IMD-2-20101013 |
| 980 | 1 | _ | |a FullTexts |
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