Issue 31, 2012
From the journal:

Physical Chemistry Chemical Physics

Formation of “fuzzy” phases with high proton conductivities in the composites of polyphosphoric acid and metal oxidenanoparticles

Kohei Miyazaki,a   Yukinari Kato,a   Toshiaki Matsui,a   Shigenobu Hayashi,b   Yasutoshi Iriyama,c   Tomokazu Fukutsuka,a   Takeshi Abea  and  Zempachi Ogumi*a  

* Corresponding authors

a Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
E-mail: ogumi@scl.kyoto-u.ac.jp

b Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan

c Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Abstract

A high proton-conducting phase appears in the composites of zirconium- and titanium-oxide nanoparticles and polyphosphoric acid (HPO3). Metal oxide nanoparticles (ZrO2 and TiO2) react with HPO3 and form composite electrolytes containing pyrophosphates (ZrP2O7 or TiP2O7) and shortened HPO3 chains. The ZrO2–HPO3 composite exhibits eleven times higher conductivity than sole HPO3 at the maximum. A formed layer of shortened HPO3 chains surrounding the pyrophosphates enhances the proton conductivities of the composite electrolytes and reduces the activation energies for the proton conductivities from 50 to 30 kJ mol−1.

Graphical abstract: Formation of “fuzzy” phases with high proton conductivities in the composites of polyphosphoric acid and metal oxide nanoparticles

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Article information

DOI
https://doi.org/10.1039/C2CP41612C
Article type
Paper
Submitted
18 May 2012
Accepted
20 Jun 2012
First published
05 Jul 2012

Phys. Chem. Chem. Phys., 2012,14, 11135-11138

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Formation of “fuzzy” phases with high proton conductivities in the composites of polyphosphoric acid and metal oxide nanoparticles

K. Miyazaki, Y. Kato, T. Matsui, S. Hayashi, Y. Iriyama, T. Fukutsuka, T. Abe and Z. Ogumi, Phys. Chem. Chem. Phys., 2012, 14, 11135 DOI: 10.1039/C2CP41612C

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