Nanoprotonics in perovsikte-type oxides: Reversible changes in color and ion conductivity due to nanoionics phenomenon in platinum-containing perovskite oxide

The ion conductivity of a solid-state material is primarily a function of its chemical composition and crystal structure. However, interfaces can play an important role in the conduction process. The effects of interfaces on ionic properties can be controlled on the basis of “nanoionics”. In this st...

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Bibliographic Details
Published in:Solid state ionics 2011-02, Vol.182 (1), p.13-18
Main Authors: Matsumoto, Hiroshige, Tanji, Takayoshi, Amezawa, Koji, Kawada, Tatsuya, Uchimoto, Yoshiharu, Furuya, Yoshihisa, Sakai, Takaaki, Matsuka, Maki, Ishihara, Tatsumi
Format: Article
Language:English
Subjects:
Nanocomposites
Nanomaterials
Nanoparticles
Nanoprotonics
Nanostructure
Oxides
Perovskite
Perovskites
Platinum
Platinum nanoparticle
Proton conductor
Solid solutions
Space charge
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Summary:The ion conductivity of a solid-state material is primarily a function of its chemical composition and crystal structure. However, interfaces can play an important role in the conduction process. The effects of interfaces on ionic properties can be controlled on the basis of “nanoionics”. In this study, we demonstrate a nanoionics phenomenon observed in a blue platinum-containing perovskite. The proton conductivity changed reversibly in response to the precipitation of platinum nanoparticles and oxidation to form a solid solution. The results of XAFS measurements, TEM analysis, and electron holography provide evidence of the nanoionics phenomenon, and suggest a possible underlying mechanism for the conductivity change caused by the small amount of precipitated platinum nanoparticles in the perovskite oxide. ► We report a reversible nanoionics effect in a platinum-containing blue perovskite. ► Conductivity changes in response to the formation of platinum nanoparticles. ► XAFS, TEM and electron holography results help understanding this phenomenon.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2010.11.016