Proton conductivity in tungsten and antimony-modified titania ceramics prepared by the sol脙脙脙脙脙脙gel method

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• 作者：Vichi ; Fl脙脙vio Maron ; Tejedor-Tejedor ; Maria Isabel ; Anderson ; Marc A.
• 关键词：84.60.D ; Sol脙脙脙脙脙脙gel ; Proton conductivity ; Inorganic electrolytes ; Fuel cells
• 刊名：Solid State Ionics
• 出版年：2005
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：March 15, 2005
• 卷：176
• 期：9-10
• 页码：973-978
• 文件大小：138 K

摘要

Titania ceramic materials modified with 5%antimony and 5%tungsten were prepared by the sol芒芒芒gel method. For the antimony-modified material, a treatment with H₂O₂ was also performed, in order to obtain antimonic acid. The electric conductivity of the xerogels was measured at 25 芒芒C in the relative humidity (RH) range 33芒芒芒81%. At 25 芒芒C, the electrical conductivity of the 芒芒芒as prepared芒芒芒 5%Sb ceramic varies from 2.02芒芒10^芒芒芒5 S cm^芒芒芒1 at 33%RH to 1.12芒芒10^芒芒芒2 S cm^芒芒芒1 at 81%R.H. For the material treated with H₂O₂, the conductivity varies from 1.56芒芒10^芒芒芒5 to 2.37芒芒10^芒芒芒2 S cm^芒芒芒1 for 33%and 81%R.H., respectively. For the tungsten-modified material, the conductivity varies from 1.02芒芒10^芒芒芒5 to 2.66芒芒10^芒芒芒3 S cm^芒芒芒1 for 33%and 81%R.H., respectively. The activation energies observed for proton conduction were 23.5 kJ mol^芒芒芒1 for TiO₂/W 5%, 22.9 kJ mol^芒芒芒1 for TiO₂/Sb 5%and 20.6 kJ mol^芒芒芒1 for the material treated with H₂O₂. The highest activation energy was observed for untreated TiO₂:24.8 kJ mol^芒芒芒1.