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| Hauptseite > Publikationsdatenbank > Recyclingmöglichkeiten für die Keramikkomponenten einer Festoxidzelle |
| Book/Dissertation / PhD Thesis | FZJ-2025-02099 |
2025
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-816-2
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Please use a persistent id in citations: urn:nbn:de:0001-2504140934243.795472099539 doi:10.34734/FZJ-2025-02099
Abstract: The solid oxide cell is a high-efficient technology for the production and conversion of hydrogen into electricity. This technology is based on high-performance ceramics that contain a variety of strategically valuable and critical raw materials. In light of the growing global interest in low-CO2 hydrogen, a significant market ramp-up of this technology is expected in the coming decade. To ensure sustainable and resourceefficient use, the development of economically viable recycling concepts for production scrap and returned materials is crucial, even at the early stages of commercialization. This thesis presents a recycling concept that primarily focuses on preserving the main fraction of the cell material in a closed-loop system. The bulk material consists of yttriastabilized zirconia and nickel, while smaller amounts of gadolinium-doped ceria and lanthanum-strontium-cobalt-ferrite are present in the cell composite. Accordingly, the recycling concept applies to fuel electrode-supported solid oxide cells and is demonstrated using cells manufactured at the Forschungszentrum Jülich. A key element of the process lies in the complete separation of the air-side perovskite components (here: lanthanum-strontium-cobalt-ferrite) from the rest of the cell composite, which was achieved through a wet chemical process using hydrochloric acid. The separation process was optimized to ensure that the perovskite compound is fully decomposed, while the main fraction of the cell remains as a stable solid phase. This undissolved solid residue is mechanically crushed and was partially reincorporated into the production of new cell material in the form of a substrate. Despite minor differences in the lateral shrinkage behavior during the sintering process, the functionality of the recycled substrate was maintained compared to a new, non-recycled standard. The closed-loop process achieved a material yield of approximately 97 %. Furthermore, the recovery of strategically valuable metals from the perovskite components, particularly lanthanum, was investigated in an open-loop approach. By direct oxalate precipitation, a large portion of the contained lanthanum was recovered with a chemical purity of over 98 %. The results demonstrate the technical feasibility of integrating ceramic solid oxide waste into the manufacturing process and retaining the majority of the cell components (85–90 mass percentage) directly in a closed loop. The advantages and limitations of the process were considered in comparison with other studies in this emerging research field and discussed throughout this work.
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