Proton Conduction and Pore Structure in Sol−Gel Glasses
Proton Conduction and Pore Structure in Sol−Gel Glasses
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DOI：
10.1021/cm020323p
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发表时间：
2002-10
影响因子：
8.6
通讯作者：
Y. Daiko;A. Kasuga;M. Nogami
中科院分区：
文献类型：
--
作者：
Y. Daiko;A. Kasuga;M. Nogami
研究了Sol-−凝胶多孔玻璃的质子导电性及其与孔结构的关系。多孔的P_2O_5-−-SiO_2玻璃在环境条件下会吸收水分，从而增加导电性。在气孔∼为5 nm或更小的玻璃中，水分子在气孔中扩散并完全填满气孔。水分子的运动被限制在小孔中，即使在低湿度下，吸附的水分子也能很好地保持。该玻璃在20℃以下的−温度范围内具有较高的电导率，而在大孔玻璃中，水分子没有受到限制，电导率突然下降到0℃以下。
Proton conduction in sol−gel-derived porous glasses was investigated and is related to the pore structure. The porous P2O5−SiO2 glasses absorb water under ambient conditions and consequently increase the electrical conductivity. In glasses having pores ∼5 nm or smaller, the water molecules diffuse through the pores and totally fill the pores. The motion of the water molecules is restricted in small pores, and the absorbed water molecules are well retained even at low humidity. The conductivity of this glass was high in the temperature range down to −20 °C. On the other hand, in glasses with large pores, no confinement effect occurred for the water molecules and the conductivity suddenly decreased below 0 °C.