Proton conduction in crystalline and porous covalent organic frameworks
Proton conduction in crystalline and porous covalent organic frameworks
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DOI：
10.1038/nmat4611
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发表时间：
2016-07-01
期刊：
影响因子：
41.2
通讯作者：
Jiang, Donglin
中科院分区：
文献类型：
--
作者：
Xu, Hong;Tao, Shanshan;Jiang, Donglin
过去几十年质子传导材料的进展产生了多种聚电解质(1-5) 和微孔聚合物(6-10)。然而，大多数研究仍然基于一种先入之见，即大孔最终只会引起质子载流子的流动，而不是质子离子的有效传导，这阻碍了对大孔聚合物用于质子传输的探索。在这里，我们展示了质子在结晶共价有机框架中穿过介孔通道的传导。该框架被设计成构成六边形排列的致密介孔通道，允许装载N-杂环质子载流子。该框架的质子电导率比微孔和无孔聚合物高 2-4 个数量级。温度依赖性和同位素实验表明，这些通道中的质子传输是由低能势垒跳跃机制控制的。我们的结果揭示了一个基于多孔共价有机框架的质子传导平台。
Progress over the past decades in proton-conducting materials has generated a variety of polyelectrolytes(1-5) and microporous polymers(6-10). However, most studies are still based on a preconception that large pores eventually cause simply flow of proton carriers rather than effcient conduction of proton ions, which precludes the exploration of large-pore polymers for proton transport. Here, we demonstrate proton conduction across mesoporous channels in a crystalline covalent organic framework. The frameworks are designed to constitute hexagonally aligned, dense, mesoporous channels that allow for loading of N-heterocyclic proton carriers. The frameworks achieve proton conductivities that are 2-4 orders of magnitude higher than those of microporous and non-porous polymers. Temperature-dependent and isotopic experiments revealed that the proton transport in these channels is controlled by a low-energy-barrier hopping mechanism. Our results reveal a platform based on porous covalent organic frameworks for proton conduction.