Please use this identifier to cite or link to this item:
|Title:||Oxygen ion diffusion and surface exchange properties of the ?- And ?-phases of Bi2O3||Authors:||Bayliss R.D.
oxide ion conductors
tracer diffusion coefficients
|Issue Date:||2014||Publisher:||Wiley-VCH Verlag||Citation:||Bayliss R.D., Cook S.N., Kotsantonis S., Chater R.J., Kilner J.A. (2014). Oxygen ion diffusion and surface exchange properties of the ?- And ?-phases of Bi2O3. Advanced Energy Materials 4 (10) : 1301575. ScholarBank@NUS Repository. https://doi.org/10.1002/aenm.201301575||Abstract:||Fast oxide ion conduction is a highly desirable property for materials in a wide range of applications. The fastest reported ionic conductor, representing the current state of the art and an oft-proposed effective limit of oxide ion conductivity, is the high temperature fluorite-structured ? phase of Bi2O3. Here, the ionic nature of this conduction is, for the first time, directly determined through oxygen tracer diffusion measurements. This phase also presents a remarkably high oxygen surface exchange coefficient, competitive with the highest performance solid oxide fuel cell (SOFC) cathodes yet counterintuitively in a material with negligible electronic conduction. The low temperature ?-Bi2O3 polymorph is also investigated, revealing a remarkable drop in diffusivity of over 7 orders of magnitude with a temperature drop of just =150 �C. Surprisingly, the diffusion studies also reveal a secondary, significantly faster migration pathway in the ? phase. This is attributed to grain boundary conduction and shown to be 3-4 orders of magnitude higher than in the bulk. This previously unobserved property could present an exciting opportunity to tailor ionic conductivity levels through manipulating microstructure down to the nanoscale. � 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.||Source Title:||Advanced Energy Materials||URI:||http://scholarbank.nus.edu.sg/handle/10635/149253||ISSN:||16146832||DOI:||10.1002/aenm.201301575|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 11, 2020
WEB OF SCIENCETM
checked on Dec 24, 2018
checked on Jul 10, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.