Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 29, Pages 10079-10086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b05182
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Funding
- MINECO (Spain) through Juan de la Cierva postdoctoral fellowship
- Spanish Ministry of Economy [MAT2016-77608-C3-1-P, MAT2013-46753-C2-1-P, CTQ2014-53486-R, ENE2016-77055-C3-1-R]
- Comunidad de Madrid [S2013/MAE-2882]
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We present the novel potential application of imine-based covalent organic frameworks (COFs), formed by the direct Schiff reaction between 1,3,5-tris(4-aminophenyl)benzene and 1,3,5-benzenetricarbaldehyde building blocks in m-cresol or acetic acid, named RT-COF-1 or RTCOF-lAc/RT-COF-1AcB. The post-synthetic treatment of RT-COF-1 with LiCl leads to the formation of LiCl@RT-COF-1. The ionic conductivity of this series of polyimine COFs has been characterized at variable temperature and humidity, using electrochemical impedance spectroscopy. LiCl@RT-COF-1 exhibits a conductivity value of 6.45 X 10(-3) S cm(-1) (at 313 K and 100% relative humidity) which is among the highest values so far reported in proton conduction for COFs. The mechanism of conduction has been determined using H-1 and Li-7 solid-state nuclear magnetic resonance spectroscopy. Interestingly, these materials, in the presence of controlled amounts of acetic acid and under pressure, show a remarkable processability that gives rise to quasi-transparent and flexible films showing in-plane structural order as confirmed by X-ray crystallography. Finally, we prove that these films are useful for the construction of proton exchange membrane fuel cells (PEMFC) reaching values up to 12.95 mW cm(-2) and 53.1 mA cm(-2) for maximum power and current density at 323 K, respectively.
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