Journal article
Towards the Validation of a Phase Field Model for Ni Coarsening in Solid Oxide Cells
Fondazione Bruno Kessler1
Paul Scherrer Institute2
Continuum Modelling and Testing, Department of Energy Conversion and Storage, Technical University of Denmark3
Department of Energy Conversion and Storage, Technical University of Denmark4
Solid State Chemistry, Department of Energy Conversion and Storage, Technical University of Denmark5
University of Michigan6
Ni coarsening in the Ni/yttria-stabilized zirconia (YSZ) fuel electrode of solid oxide cells (SOCs) is a major cause of long-term performance degradation. Phase-field modeling is a powerful tool for studying Ni coarsening in the complex 3D structures of SOC fuel electrodes. In this work, we present a study aimed at validating a phase-field model, comparing simulation results with time-dependent ex-situ tomographic data.
Three equilibrium Ni/YSZ contact angles are examined: 97°, 120°, and 150°. Simulated microstructures are characterized through quantities such as the Ni mean radius, triple-phase boundaries, and interface shape distribution. The phase-field model reproduces the improved pore connectivity in the first stage of Ni coarsening observed in the tomography data.
This model also indicates that the contact angle plays a key role in the microstructural evolution during Ni coarsening, and the best match to the experiment was obtained with the equilibrium contact angle of 120º, close to a measured value in literature. Finally, the limitations of the model are discussed.
Language: | English |
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Year: | 2021 |
Pages: | 116887 |
ISSN: | 18732453 and 13596454 |
Types: | Journal article |
DOI: | 10.1016/j.actamat.2021.116887 |
ORCIDs: | 0000-0002-1227-5293 , Chen, Ming , Jørgensen, Peter Stanley and Hendriksen, Peter Vang |