Journal
JOURNAL OF POWER SOURCES
Volume 482, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228971
Keywords
SOFC; Phase-field modeling; Microstructure evolution; Ni coarsening; Ni redistribution; Ni(OH)(2) diffusion
Funding
- US Department of Energy's Fossil Energy Crosscutting Technology Research Program
- Leidos Research Support Team under the RSS [89243318CFE000003]
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The study found that under strictly humid conditions, while the presence of steam gradient leads to nickel redistribution, the formation and diffusion of Ni(OH)(2) do not significantly change the nickel coarsening rate. It is concluded that other competing mechanisms must be responsible for the observed nickel redistribution and enhanced coarsening under humid conditions.
Microstructure evolution in a solid oxide fuel cell anode is strongly affected by operating condition. The detailed mesoscale evolution mechanism under operating condition is still under debate. Here we develop a phase-field model to simulate microstructure evolution through formation and diffusion of gaseous Ni(OH)(2). We studied the coarsening kinetics and redistribution of Ni under different steam distributions and compare it to that under pure hydrogen condition. The results suggest that although the presence of a steady gradient of steam leads to redistribution of Ni, Ni(OH)(2) formation and diffusion do not significantly change the Ni coarsening rate under strictly humid conditions, contrary to commonly reported hypotheses. It is concluded that competing mechanisms other than Ni(OH)(2) diffusion must be responsible for the experimentally observed Ni redistribution and enhanced coarsening under humid conditions.
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