Proton Conduction in Sulfonated Organic-Inorganic Hybrid Monoliths with Hierarchical Pore Structure.
Proton Conduction in Sulfonated Organic-Inorganic Hybrid Monoliths with Hierarchical Pore Structure.
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DOI：
10.1021/acsami.6b08477
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发表时间：
2016-09
影响因子：
9.5
通讯作者：
Martin von der Lehr;Christopher F. Seidler;Dereje H. Taffa;M. Wark;B. Smarsly;R. Marschall
中科院分区：
文献类型：
--
作者：
Martin von der Lehr;Christopher F. Seidler;Dereje H. Taffa;M. Wark;B. Smarsly;R. Marschall
采用溶胶-凝胶法在改变介孔尺寸的条件下制备了具有层次化孔隙度的有机-无机杂化整体，呈现出大孔和中孔。孔壁中的有机部分是通过用双硅烷化的苯分子取代高达10%的硅前驱体四甲基正硅酸盐来结合的。用磺酸基团官能化后，研究了具有双峰孔结构的磺化杂化单体的质子导电性与温度和相对湿度的关系。层次化的孔道体系和可控的介孔设计对磺化和质子传导是至关重要的。这些仅含10%有机前驱体的磺化杂化层状整体在不同的相对湿度下表现出比100%双硅化前驱体得到的磺化周期性介孔有机硅更高的质子传导性，即使在较低浓度的磺酸基团下也是如此。
Porous organic-inorganic hybrid monoliths with hierarchical porosity exhibiting macro- and mesopores are prepared via sol-gel process under variation of the mesopore size. Organic moieties in the pore walls are incorporated by substituting up to 10% of the silicon precursor tetramethylorthosilicate with bisilylated benzene molecules. After functionalization with sulfonic acid groups, the resulting sulfonated hybrid monoliths featuring a bimodal pore structure are investigated regarding proton conduction depending on temperature and relative humidity. The hierarchical pore system and controlled mesopore design turn out to be crucial for sulfonation and proton conduction. These sulfonated hybrid hierarchical monoliths containing only 10% organic precursor exhibit higher proton conduction at different relative humidities than sulfonated periodic mesoporous organosilica made of 100% bisilylated precursors exhibiting solely mesopores, even with a lower concentration of sulfonic acid groups.