Heterogeneous Doping of a Weak Covalent Electrolyte: Proton Conductivity Enhancement of Imidazole by Admixture of Oxide Particles

Beyazyildirim, Seniz and Kreuer, Klaus Dieter and Schuster, Michael and Bhattacharyya, Aninda Jiban and Maier, Joachim (2008) Heterogeneous Doping of a Weak Covalent Electrolyte: Proton Conductivity Enhancement of Imidazole by Admixture of Oxide Particles. In: Advanced Materials, 20 (7). 1274 -1278.

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Abstract

A nowadays well-established method to enhance the ionic conductivity of weak electrolytes utilizes the admixture of fine oxide particles, for example, $SiO_2$, $Al_2O_3$, and $TiO_2$. The concept of heterogeneous doping has been successfully used to quantitatively explain the ion conduction mechanism of such composites.[1] Starting out from ceramic systems, in which this technique has been proven to be most efficient, heterogeneous doping has also been successfully extended to improve the ionic conductivity of salt solutions: salts dissolved in polymers (e.g., poly(ethylene oxide) (PEO)–$LiClO_4:TiO_2$[2]) as well as in non-aqueous liquid solutions (e.g., $LiClO_4$ in MeOH:oxide[3]). According to the concept, dispersion of fine oxide particles in the electrolyte leads to an interaction which results in trapping of one ion species on the oxide surface, resulting in an increased concentration of the compensating ions in the space-charge region at the interface of oxide and conductor. In such cases ion pairs are efficiently broken. The reason is not the variation of the dissociation constant but the deviation from electroneutrality.

Item Type:	Journal Article
Publication:	Advanced Materials
Publisher:	John & Wiley sons, Inc.
Additional Information:	Copyright of this article belongs to John & Wiley sons, Inc.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 Jul 2008
Last Modified:	19 Sep 2010 04:47
URI:	http://eprints.iisc.ac.in/id/eprint/15014

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