Issue 26, 2023

Construction of dense H-bond acceptors in the channels of covalent organic frameworks for proton conduction

Abstract

The design of high-conductivity proton exchange membranes (PEMs) under high-temperature anhydrous conditions is important for fuel cells. Covalent organic frameworks (COFs) are a class of promising templates for proton conduction because their one-dimensional porous channels provide a fast pathway for proton transport. Herein, we have demonstrated two two-dimensional (2D) COFs with different densities of oxygen atoms along the pore walls as a host with H3PO4 loading for proton conduction. The O atoms facilitated the formation of the hydrogen-bond networks along the pores, further facilitating proton transport. The COF (PA@PyTTA-BMTP-COF) with 12 O atoms in each pore showed a proton conductivity of 26.00 mS cm−1, which was three times that of the COF (PA@PyTTA-DHTA-COF) with four atoms in each pore at 140 °C under anhydrous conditions. This work gives us a new platform to design porous channels for ionic conduction.

Graphical abstract: Construction of dense H-bond acceptors in the channels of covalent organic frameworks for proton conduction

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2023
Accepted
01 Jun 2023
First published
01 Jun 2023

J. Mater. Chem. A, 2023,11, 13965-13970

Construction of dense H-bond acceptors in the channels of covalent organic frameworks for proton conduction

S. Liu, M. Liu, X. Li, Q. Xu, Y. Sun and G. Zeng, J. Mater. Chem. A, 2023, 11, 13965 DOI: 10.1039/D3TA01907A

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