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Abstract
For solid oxide fuel and electrolysis cells, precise tracking of 3D
microstructural change in the electrodes during operation is considered
critical to understand the complex relationship between electrode
microstructure and performance. Here, for the first time, we report a
significant step towards this aim by visualizing a complete redox cycle
in a solid oxide cell (SOC) electrode. The experiment demonstrates
synchrotron-based ptychography as a method of imaging SOC electrodes,
providing an unprecedented combination of 3D image quality and spatial
resolution among non-destructive imaging techniques. Spatially
registered 3D reconstructions of the same location in the electrode
clearly show the evolution of the microstructure from the pristine state
to the oxidized state and to the reduced state. A complete mechanical
destruction of the zirconia backbone is observed via grain boundary
fracture, the nickel and pore networks undergo major reorganization and
the formation of internal voids is observed in the nickel-oxide
particles after the oxidation. These observations are discussed in terms
of reaction kinetics, electrode mechanical stress and the consequences
of redox cycling on electrode performance.
Original language | English |
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Journal | Journal of Power Sources |
Volume | 360 |
Pages (from-to) | 520-527 |
ISSN | 0378-7753 |
DOIs | |
Publication status | Published - 2017 |
Keywords
- Ex-situ
- Ptychography
- Nano-tomography
- Solid oxide cell
- Oxidation
- Reduction
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Dive into the research topics of 'Ex-situ tracking solid oxide cell electrode microstructural evolution in a redox cycle by high resolution ptychographic nanotomography'. Together they form a unique fingerprint.Activities
- 1 Conference presentations
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Sample Design and Preparation Techniques for Dynamic Microstructural Studies of High Temperature Electrochemical Cells
Bowen, J. R. (Speaker)
11 Jun 2018Activity: Talks and presentations › Conference presentations