Enhancement of the protonic conductivity of α-zirconium phosphate by composite formation with alumina or silica

✍ Scribed by Xavier Glipa; Jean-Michel Leloup; Deborah J Jones; Jacques Rozière

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 313 KB
• Volume: 97
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(97)00064-7

✦ Synopsis

The protonic conductivity of zirconium phosphate, Zr(HPO ) ? H O (a-ZrP), can be increased by dispersion with up to 4 2 2 ca. 30 mole% inorganic oxide. This positive composite effect is observed both when a-ZrP is coprecipitated from a delaminated form with colloidal silica and when it is intimately dispersed with a-Al O by ball-milling. The absolute value 2 3

of the conductivity depends on the pre-treatment undergone by ZrP but, in all cases, it is enhanced by 5-10 times after composite formation with a maximum observed at ca. 20 mole % inorganic oxide. These effects are explained in terms of local modification of the hydrogen phosphate surface.