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

Stub Sindre Ostby; Vollestad Einar; Norby Truls

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

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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 degrees C). The presence pf humidity introduces protonic surface Conduction, and porous YSZ shhws pure protonic conduction below similar to 150 degrees C. H/D isotope effect studies combined with transport number measurements reveal a change in transport mechanism from structural diffilsion (Grotthuss type) to vehicular transport when the relative humidity exceeds similar to 60 RH, coinciding with a. changein the adsorbed water-layer from an "ice-like" to a "water-like" structure. Similarly, the activation energy for proton transport decreases from 0.43 to 0.28 eV when the relative humidity increases from 20 RH to 84 RH, reflecting changes in the enthalpies of armation and migration of charged species with increasing water layer thickness.

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《The journal of physical chemistry, C. Nanomaterials and interfaces》 |2017年第23期|12817-12825|共9页
作者
Stub Sindre Ostby; Vollestad Einar; Norby Truls;
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Univ Oslo, FERMiO, Dept Chem, Ctr Mat Sci & Nanotechnol, Gaustadalleen 21, NO-0349 Oslo, Norway;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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Mechanisms of Protonic Surface Transport in Porous Oxides: Example of YSZ

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