Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 21, Pages 18351-18358Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b04311
Keywords
proton-exchange membrane; soluble crystalline porous materials; porous organic cage; 3D proton-transfer channel; in situ crystallization
Funding
- Ministry of Science & Technology of China [2016YFA0203302]
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Porous organic cage, a kind of newly emerging soluble crystalline porous material, is introduced to proton exchange membrane by in situ crystallization. The crystallized Cage 3 with intrinsic water-meditated three-dimensional interconnected proton pathways working together with Nafion matrix generates a composite membrane with highly improved proton conductivity. Different from inorganic crystalline porous materials, like metal-organic frameworks, the organic porous material shows better compatibility with Nafion matrix due to the absence of inorganic elements. In addition, Cage 3 can absorb water up to 20.1 wt %, which effectively facilitates proton conduction under both high- and low-humidity conditions. Meanwhile, the selectivity of Nafion-Cage 3 composite membrane is also elevated upon the loading of Cage 3. The proton conductivity is evidently enhanced without obvious increased methanol permeability. At 90 degrees C and 95% RH, the proton conductivity of NC3-5 reaches 0.27 S.cm(-1), highly improved compared to 0.08 S.cm(-1) of recast Nafion under the same condition. This study offers a new strategy for modifying proton-exchange membrane with crystalline porous materials.
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