Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 101, Issue 3, Pages 1058-1073Publisher
WILEY
DOI: 10.1111/jace.15274
Keywords
flash sintering; grain boundary cavity; grain growth; polarization; solid oxide electrolysis cell; solid oxide fuel cell; YSZ
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Funding
- U.S. Department of Energy [DEFG02-11ER46814]
- U.S. National Science Foundation [DMR-1120901]
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Knowing the correlation between grain boundary mobility and oxygen potential in yttria-stabilized zirconia (YSZ), we have utilized the grain size as a microstructural marker to map local oxygen potential. Abrupt oxygen potential transition is established under a large current density and in thicker samples. Cathodically depressed oxygen potential can be easily triggered by poor electrode kinetics or in an oxygen-lean environment. Widespread cavitation in the presence of highly reducing oxygen potential suggests oxygen vacancy condensation instead of oxygen bubble formation as commonly assumed for solid oxide fuel/electrolysis cells. These results also suggest electrode kinetics has a direct influence on the microstructure and properties of ceramics sintered under a large electric current.
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