期刊
JOURNAL OF POWER SOURCES
卷 535, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231420
关键词
Sandwiched tri-layers; CG-MD; Sintering; Particle stress; Symmetric LSCM-YSZ electrode
资金
- National Key Research and Development Project of China [2018YFB1502204]
- Ningbo Innovation team grant [Ningbo[2017]74]
- National Natural Science Foundation of China (NSFC) [52101320]
- Ningbo major special projects of the Plan Science and Technology Innovation 2025 [2018B10048, 2019B10043]
- Shanghai Frontiers Science Center of Full Penetration Far-reaching Offshore Ocean Energy and Power
- Fishery Engineering and Equipment Innovation Team of Shanghai High-level Local University
Degradation issue is a major challenge in long-term operation of reversible solid oxide fuel cell, often occurring at the interface region between the electrode and electrolyte layers. In this study, a sandwiched tri-layers design with symmetric composite electrodes structure is developed and investigated, aiming to understand the sintering mechanism and improve thermomechanical compatibility. By simulating the sintering process and analyzing various parameters, the researchers have revealed the factors influencing the sintered structure and performance.
Degradation issue in reversible solid oxide fuel cell is one of the major challenges to limit its durability and reliability in long-term operation. Mechanical faulty occurs often on the interface region between the electrode and electrolyte layers. In this work, a sandwiched tri-layers design with symmetric composite electrodes structure is developed and investigated in terms of sintered structures and parameters. A coarse-grained method integrating with core-shell model is applied to simulate the sintering process for the nanoparticles and dense layer structure. Evolution and stress distribution of the obtained microstructures are predicted for understanding the sintering mechanism. Effects of sintering temperature, nanoparticle size, oxygen vacancy and composition are also investigated, expecting to achieve improved thermomechanical compatibility and low stress. It is revealed that surface diffusion is a major contribution on the neck formation, and a high stress is located on the interface region between the nanoparticles and dense layer. The sintered structure is controlled by the particle stress below 1473 K, while by both stress and diffusion above 1473 K. Low stress and high electrochemical performance can be achieved when the oxygen vacancy ranges in 1.65%-5.45%, or the mass fraction of yittria stabilized zirconia ranges in 50%-80% in the composite nanoparticles.
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