Electrical and hydrogen reduction enhances kinetics in doped zirconia and ceria: II . Mapping electrode polarization and vacancy condensation in YSZ

Dong, Yanhao; Chen, I‐Wei

doi:10.1111/jace.15274

Electrical and hydrogen reduction enhances kinetics in doped zirconia and ceria: II . Mapping electrode polarization and vacancy condensation in YSZ

Journal Article · Thu Oct 26 00:00:00 EDT 2017 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15274· OSTI ID:1405041

Dong, Yanhao ^[1]; ^[1]

Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania

Abstract

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.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0007064

OSTI ID:: 1405041

Alternate ID(s):: OSTI ID: 1541597

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 101; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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