Transformation of an oxygen ion conductor to a proton conductor by solid state reaction

It is shown that starting from a thin, gas tight layer of an oxygen ion conductor such as 8YSZ a thin, gas tight layer of a proton conductor can be obtained by coating the original layer with BaCO 3 or BaO followed by sintering. Generally, a homogeneous Zr 1– x Y x O 2– y ceramic compound will react...

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Bibliographic Details
Published inSolid state ionics Vol. 176; no. 29; pp. 2275 - 2277
Main Author Schober, T.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2005
Subjects
Fuel cell
Oxygen ion conduction
Proton conduction
Sensors
Thin film
Sensors
Oxygen ion conduction
Proton conduction
Fuel cell
Thin film
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Summary:It is shown that starting from a thin, gas tight layer of an oxygen ion conductor such as 8YSZ a thin, gas tight layer of a proton conductor can be obtained by coating the original layer with BaCO 3 or BaO followed by sintering. Generally, a homogeneous Zr 1– x Y x O 2– y ceramic compound will react with BaO to form the desired proton conductor BaZr 1– x Y x O 3– x/2 . This procedure obviates the deposition of proton conducting layers starting from fine powders which in view of the poor sinterabilty of the common proton conductors was a difficult endeavor in the past. It also permits the construction of larger components (reactors etc.) covered with a proton conductor. The present technique is also applicable to the formation of CZI10 (CaZr 0.9In 0.1O 3–y) layers. The latter compound is an excellent proton conductor for potentiometric purposes and has seen commercial use in hydrogen sensors in molten aluminium (5).
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2005.06.021