Dynamics of Proton Transfer in the Sol−Gel-Derived P2O5−SiO2Glasses
Dynamics of Proton Transfer in the Sol−Gel-Derived P2O5−SiO2Glasses
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溶胶凝胶衍生的 P2O5−SiO2 玻璃中质子传输的动力学
DOI：
10.1021/jp010611t
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发表时间：
2001
影响因子：
3.3
通讯作者：
T. Kasuga
中科院分区：
文献类型：
--
作者：
M. Nogami;Y. Daiko;T. Akai;T. Kasuga
讨论了溶胶凝胶衍生的多孔 P2O5−SiO2 玻璃中的水扩散及其对质子传导的作用。室温下水在玻璃中的扩散系数为∼10-7cm2/s。电导率与水分子数量的对数成正比，并用三条独立的线响应水浓度。由质子自旋晶格弛豫确定的活化能为~10 kJ/mol，与水浓度无关，而质子传导的活化能随着水浓度的增加而降低至~10 kJ/mol。
Water diffusion and its role on the proton conduction are discussed in the sol−gel-derived porous P2O5−SiO2glasses. The diffusion coefficient of water in the glass is ∼10-7cm2/s at room temperature. The electrical conductivity is proportional to the logarithm of the number of water molecules with three separate lines in response to the water concentration. The activation energy determined from the spin−lattice relaxation of proton is, ∼10 kJ/mol, independent of the water concentration, whereas the activation energy for proton conduction decreases to ∼10 kJ/mol with increasing water concentration.