TY - JOUR
T1 - Tight Covalent Organic Framework Membranes for Efficient Anion Transport via Molecular Precursor Engineering
AU - Kong, Yan
AU - He, Xueyi
AU - Wu, Hong
AU - Yang, Yi
AU - Cao, Li
AU - Li, Runlai
AU - Shi, Benbing
AU - He, Guangwei
AU - Liu, Yiqin
AU - Peng, Quan
AU - Fan, Chunyang
AU - Zhang, Zhenjie
AU - Jiang, Zhongyi
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2021/8/2
Y1 - 2021/8/2
N2 - Fabricating covalent organic frameworks (COFs) membranes with tight structure, which can fully utilize well-defined framework structure and thus achieve superior conduction performance, remains a grand challenge. Herein, through molecular precursor engineering of COFs, we reported the fabrication of tight COFs membrane with the ever-reported highest hydroxide ion conductivity over 200 mS cm−1 at 80 °C, 100 % RH. Six quaternary ammonium-functionalized COFs were synthesized by assembling functional hydrazides and different aldehyde precursors. In an organic-aqueous reaction system, the impact of the aldehyde precursors with different size, electrophilicity and hydrophilicity on the reaction-diffusion process for fabricating COFs membranes was elucidated. Particularly, more hydrophilic aldehydes were prone to push the reaction zone from the interface region to the aqueous phase of the reaction system, the tight membranes were thus fabricated via phase-transfer polymerization process, conferring around 4–8 times the anion conductivity over the loose membranes via interfacial polymerization process.
AB - Fabricating covalent organic frameworks (COFs) membranes with tight structure, which can fully utilize well-defined framework structure and thus achieve superior conduction performance, remains a grand challenge. Herein, through molecular precursor engineering of COFs, we reported the fabrication of tight COFs membrane with the ever-reported highest hydroxide ion conductivity over 200 mS cm−1 at 80 °C, 100 % RH. Six quaternary ammonium-functionalized COFs were synthesized by assembling functional hydrazides and different aldehyde precursors. In an organic-aqueous reaction system, the impact of the aldehyde precursors with different size, electrophilicity and hydrophilicity on the reaction-diffusion process for fabricating COFs membranes was elucidated. Particularly, more hydrophilic aldehydes were prone to push the reaction zone from the interface region to the aqueous phase of the reaction system, the tight membranes were thus fabricated via phase-transfer polymerization process, conferring around 4–8 times the anion conductivity over the loose membranes via interfacial polymerization process.
UR - https://onlinelibrary.wiley.com/doi/10.1002/anie.202105190
UR - http://www.scopus.com/inward/record.url?scp=85109102520&partnerID=8YFLogxK
U2 - 10.1002/anie.202105190
DO - 10.1002/anie.202105190
M3 - Article
SN - 1521-3773
VL - 60
SP - 17638
EP - 17646
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 32
ER -