Mechanoassisted Synthesis of Sulfonated Covalent Organic Frameworks with High Intrinsic Proton Conductivity
Peng, Yongwu Xu, Guodong Hu, Zhigang Cheng, Youdong Yuan, Daqiang
Xu, Guodong
Yuan, Daqiang
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Alternative Title
Abstract
© 2016 American Chemical Society. It is challenging to introduce pendent sulfonic acid groups into modularly built crystalline porous frameworks for intrinsic proton conduction. Herein, we report the mechanoassisted synthesis of two sulfonated covalent organic frameworks (COFs) possessing one-dimensional nanoporous channels decorated with pendent sulfonic acid groups. These COFs exhibit high intrinsic proton conductivity as high as 3.96 × 10-2 S cm-1 with long-term stability at ambient temperature and 97% relative humidity (RH). In addition, they were blended with nonconductive polyvinylidene fluoride (PVDF) affording a series of mixed-matrix membranes (MMMs) with proton conductivity up to 1.58 × 10-2 S cm-1 and low activation energy of 0.21 eV suggesting the Grotthuss mechanism for proton conduction. Our study has demonstrated the high intrinsic proton conductivity of COFs shedding lights on their wide applications in proton exchange membranes.
Keywords
Science & Technology, Technology, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Science & Technology - Other Topics, Materials Science, proton conductivity, covalent organic frameworks, mechanoassisted synthesis, mixed matrix membranes, proton exchange membranes, COORDINATION POLYMERS, FUEL-CELLS, MECHANOCHEMICAL SYNTHESIS, CARBON-DIOXIDE, CRYSTALLINE, ACID, HYDROGEN, ELECTROLYTE, MEMBRANES, LIQUID
Source Title
ACS APPLIED MATERIALS & INTERFACES
Publisher
AMER CHEMICAL SOC
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Date
2016-07-20
DOI
10.1021/acsami.6b06189
Type
Article