This title appears in the Scientific Report :
2022
Please use the identifier:
http://hdl.handle.net/2128/30881 in citations.
Influence of dopants on contact resistance in anode-supported solid oxide fuel cells (AS-SOFCs) between doped ceria and YSZ
Influence of dopants on contact resistance in anode-supported solid oxide fuel cells (AS-SOFCs) between doped ceria and YSZ
Influence of dopants on contact resistance in anode supported solid oxide fuel cells (AS-SOFCs) between doped ceria and YSZAlexander Schwiers, Christian Lenser, Norbert H. MenzlerForschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK),IEK-1: Materials Synthesis and Processing.W...
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Personal Name(s): | Schwiers, Alexander (Corresponding author) |
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Lenser, Christian / Menzler, Norbert H. (Last author) | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Imprint: |
2022
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Conference: | Ceramics 2022, online (Germany), 2022-03-07 - 2022-03-09 |
Document Type: |
Conference Presentation |
Research Program: |
Solid Oxide Fuel Cell Electrochemistry for Hydrogen |
Link: |
OpenAccess |
Publikationsportal JuSER |
Influence of dopants on contact resistance in anode supported solid oxide fuel cells (AS-SOFCs) between doped ceria and YSZAlexander Schwiers, Christian Lenser, Norbert H. MenzlerForschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK),IEK-1: Materials Synthesis and Processing.Wilhelm-Johnen-Straße, 52428 Juelich/GermanyTel.: +49 2461 61-96735a.schwiers@fz-juelich.deAbstractAnode-supported solid oxide fuel cells use Ni/YSZ as anode which makes them unflexible in using biogas due to strong degradation. To improve fuel flexibility, more degradation-tolerant materials have to be implemented. Doped ceria is promising since it shows increased degradation tolerance and higher ionic conductivities in the intermediate temperature regime and some electrochemical activity.However, integration of ceria into a cell is difficult because high sintering temperatures are needed to achieve the necessary microstructure. Implementing ceria between the substrate and electrolyte leads to interdiffusion during sintering and the formation of a Ce1-xZxrO2 phase. In addition to lower conductivity of the mixed phase, the roughening at the interface between anode and electrolyte leads to an increase in polarization resistance of the electrode due to interdiffusion. We investigated the influence of the dopant in X0.1Gd0.9O1.95 (X = Sm, Gd, or Y) on the interdiffusion with 8YSZ. Powder mixtures of YSZ and XDC were prepared and sintered at different temperatures. The interdiffusion behavior was analyzed by XRD and Rietveld refinement. Interdiffusion in layered systems was investigated by SEM analysis. Impedance spectroscopy is used to analyze the influence of the dopant on contact resistance. SDC shows less interdiffusion, Ce1-xZrxO2 formation and a narrower interdiffusion zone. Impedance analysis indicates a different behavior compared to Ni-GDC and Ni-YSZ electrodes. |