Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 7, Pages 8198-8205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19953
Keywords
covalent organic frameworks; proton conductors; ionic frameworks; organic gel; fuel cells
Funding
- National Natural Science Foundation of China [21703072]
- Natural Science Foundation of Fujian Province [2019J06018]
- Program for Innovative Research Team in Science and Technology in Fujian Province University
- Promotion Program for Young and Middle-aged Teachers in Science and Technology Research of Huaqiao University
- NANO-X in SINANO
- Scientific Research Starting Foundation of Huaqiao University [Z17Y0028]
- China Postdoctoral Science Foundation [2018M642563]
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We report the rational design and implementation of a new class of gel guest-assisted, ionic covalent organic framework (COF) membranes that exhibit superior H+ conduction. The as-synthesized COFs are postmodified via a lithiation (or sodiation) treatment. The hydrophilic Li or Na ions in the COFs form a dense and extensive hydrogen-bonding network of H2O molecules with mobile H+ at the periphery, thereby transforming COFs into H+ conductors. Then, the ionic COFs are assembled into a flexible H+ conductor membrane via a gelation process, where the organic gel provides both mechanical strength and additional H+ carriers for fast H+ conduction. The final COF-based membrane exhibits an excellent H+ conductivity of 1.3 x 10(-1) S cm(-1) at 313 K and 98% relative humidity, which are the highest values of the COF-based H+ conductors reported until now and are even comparable with those of the typical commercial Nafion membrane. We anticipate that the two-in-one strategy would open up a porous COF-driven new molecular framework and membrane architectural design/opportunity for development of next-generation ionic conductors.
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