Affiliation:
1. Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry University Beijing 100083 P. R. China
2. MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy Beijing Forestry University Beijing 100083 P. R. China
Abstract
AbstractThe exponential interest in covalent organic frameworks (COFs) arises from the direct correlation between their diverse and intriguing properties and the modular design principle. However, the insufficient interlamellar interaction among COF nanosheets greatly hinders the formation of defect‐free membranes. Therefore, developing a methodology for the facile fabrication of these materials remains an enticing and highly desirable objective. Herein, ultrahigh proton conductivity and superior stability are achieved by taking advantage of COF composite membranes where 2D TB‐COF nanosheets are linked by 1D lignocellulosic nanofibrils (LCNFs) through π‐π and electrostatic interactions to form a robust and ordered structure. Notably, the high concentration of ‐SO3H groups within the COF pores and the abundant proton transport paths at COFs‐LCNFs interfaces impart composite membranes ultrahigh proton conductivity (0.348 S cm−1 at 80 °C and 100% RH). Moreover, the directional migration of protons along the stacked nanochannels of COFs is facilitated by oxygen atoms on the keto groups, as demonstrated by density functional theory (DFT) calculations. The simple design concept and reliable operation of the demonstrated mixed‐dimensional composite membrane are expected to provide an ideal platform for next‐generation conductive materials.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
7 articles.
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