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| Hauptseite > Publikationsdatenbank > Performance of Ni/Fe-GDC electrode under high temperature SOEC conditions |
| Hauptseite > Publikationsdatenbank > Performance of Ni/Fe-GDC electrode under high temperature SOEC conditions |
| Abstract | FZJ-2026-05644 |
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2026
Abstract: Electrode degradation during long-term operation remains a major challenge in the development of SOECs. The state-of-the-art Ni-YSZ fuel electrode experiences Ni migration away from the electrolyte interface and particle agglomeration, leading to significant performance loss under high-temperature electrolysis conditions.. As an alternative, Ni-gadolinium doped ceria (GDC) based cermets are particularly attractive due to the mixed ionic and electronic conductivity of GDC, which enhances interfacial charge transfer kinetics and improves SOEC performance. However, standard Ni-GDC cermets are not immune to microstructural instability; they continue to exhibit Ni depletion and migration, and the catalytic activity can be impeded by the partial coverage of Ni particles by the GDC phase.To address these microstructural instabilities, this study introduces Iron (Fe) into the Ni-GDC electrode system. Single cells supported by 8YSZ were fabricated with compositions of Ni-GDC/8YSZ/GDC/LSCF and Ni/Fe-GDC/8YSZ/GDC/LSCF. The fuel and air electrodes were screen-printed with configurations of thickness ∼15–20 μm (∅ ∼12 mm) and thickness ∼30 μm (∅ ∼12 mm), respectively. A comparative analysis of the electrochemical performance and microstructural evolution of these cells under high-temperature steam SOEC conditions was carried out. Single cell testing was conducted in the temperature range of 750–900 oC in humidified H2 (60% steam). The study focuses on characterizing the influence of the Fe dopant and its interaction with Ni-GDC, along with the analysis of the suppression of Ni migration and the prevention of GDC coverage on catalytic sites. Electrochemical testing was coupled with post-reaction characterization to correlate performance stability with morphological changes. While 5% Fe doping successfully improved current density and lowered polarization resistance, increasing the concentration to 10% degraded overall electrochemical performance.
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