Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 28, Pages 18505-18512Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06189
Keywords
proton conductivity; covalent organic frameworks; mechanoassisted synthesis; mixed matrix membranes; proton exchange membranes
Funding
- National University of Singapore (CENGas) [R-261-508-001-646]
- Singapore Ministry of Education (MOE AcRF) [R-279-000-410-112]
- National Natural Science Foundation of China [21233006, 21473164, 21403202]
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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 onedimensional nanoporous channels decorated with pendent sulfonic acid groups. These COFs exhibit high intrinsic proton conductivity as high as 3.96 X 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 x 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.
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