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Mechanisms of Protonic Surface Transport in Porous Oxides: Example of YSZ

Stub, Sindre Østby; Vøllestad, Einar; Norby, Truls Eivind
Journal article; SubmittedVersion
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Mechanisms+of+p ... +porous+oxides_revised.pdf (1.471Mb)
Year
2017
Permanent link
http://urn.nb.no/URN:NBN:no-64342

CRIStin
1534325

Is part of
Stub, Sindre Østby (2017) Protonic Conduction in Porous Oxides. Doctoral thesis
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  • Kjemisk institutt [842]
  • CRIStin høstingsarkiv [15853]
Original version
Journal of Physical Chemistry C. 2017, 121 (23), 12817-12825, DOI: http://dx.doi.org/10.1021/acs.jpcc.7b03005
Abstract
The electrical properties and the charge carrier mechanism of porous 8 mol% yttria-stabilized zirconia (8YSZ) ceramic samples have been investigated over wide ranges of relative humidity (RH) and temperature (25-400 ºC). The presence of humidity introduces protonic surface conduction, and porous YSZ shows pure protonic conduction below ~150 ºC. H/D isotope effect studies combined with transport number measurements reveal a change in transport mechanism from structural diffusion (Grotthuss type) to vehicular transport when the relative humidity exceeds ~60% RH, coinciding with a change in the adsorbed water layer from an “ice-like” to a “water-like” structure. Similarly, the activation energy for proton transport decreases from 0.43 eV to 0.28 eV when the relative humidity increases from 20% RH to 84% RH, reflecting changes in the enthalpies of formation and migration of charged species with increasing water layer thickness.
 
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