Issue 1, 2024

Covalent organic frameworks with flexible side chains in hybrid PEMs enable highly efficient proton conductivity

Abstract

Electrochemical hydrogen compression (EHC) is an emerging energy conversion technology. Proton exchange membranes (PEMs) with high proton conductivity and high mechanical strength are highly required to meet the practical requirements of EHC. Herein, ionic covalent organic frameworks (iCOFs) with tunable side chains were synthesized and introduced into the sulfonated poly (ether ether ketone) (SPEEK) matrix to fabricate hybrid PEMs. In our membranes, the rigid iCOFs afford ordered proton conduction channels, whereas the flexible side chains on iCOFs afford abundant proton conduction sites, adaptive hydrogen bonding networks, and high local density short hydrogen bonds for highly efficient proton transport. Moreover, the hydrogen bond interactions between the side chains on iCOFs and the SPEEK matrix enhance the mechanical stability of membranes. As a result, the hybrid PEM acquires an enhanced proton conductivity of 540.4 mS cm−1 (80 °C, 100%RH), a high mechanical strength of 120.41 MPa, and a superior performance (2.3 MPa at 30 °C, 100%RH) in EHC applications.

Graphical abstract: Covalent organic frameworks with flexible side chains in hybrid PEMs enable highly efficient proton conductivity

Supplementary files

Article information

Article type
Communication
Submitted
03 Nhl 2023
Accepted
20 Nhl 2023
First published
26 Nhl 2023

Mater. Horiz., 2024,11, 141-150

Covalent organic frameworks with flexible side chains in hybrid PEMs enable highly efficient proton conductivity

Z. Liu, X. Pang, B. Shi, N. Xing, Y. Liu, B. Lyu, L. Zhang, Y. Kong, S. Wang, Z. Gao, R. Xue, T. Jing, C. Liu, Q. Bai, H. Wu and Z. Jiang, Mater. Horiz., 2024, 11, 141 DOI: 10.1039/D3MH01604H

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