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Research Article | Open Access

Facile construction of polyoxometalate-modified polyaryletherketone-based hybrid membranes with enhanced proton conductivity

Bo Hu1,§, Qiuchen Du2,§, Yang Yang2, Dengdeng Li2, Jiawang Fu2, Bailing Liu2,3 ( ), Hong-Ying Zang1 ( ), Yangguang Li1 ( ), Haiming Xie1, Zhongmin Su4
Department of Chemistry, Northeast Normal University, Changchun 130024, China
Department of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China
Chongqing Research Institute, Changchun University of Science and Technology, Chongqing 401120, China
State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130021, China

§ Bo Hu and Qiuchen Du contributed equally to this work.

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Abstract

The development of novel proton exchange membranes (PEMs) with high proton conductivity and good mechanical performance as alternatives to Nafion is crucial. Polyoxometalates (POMs), a type of solid-state nanoclusters, possess high proton conductivity and good structural stability, making them suitable functional inorganic fillers to improve the performance of PEMs. Herein, the Keggin-type POM H3PW12O40·nH2O (PW12) was introduced into sulfonated polyaryletherketone (SPAEK) with closely packed and flexible side chains to construct hybrid membranes (SPAEK-PW12-x%, x = 5, 10, 13, 15). Because of its structural characteristics, the nanosized PW12 induced precise hybridization of the nanophase structure of this ionomeric polymer and the formation of proton transport channels. Additionally, the hydrogen-bonding networks formed by PW12 and sulfonic acid groups increased the proton conductivity and mechanical strength of the resulting hybrid PEMs and improved the close-packed structure of the PEMs to achieve an appropriate balance between conductivity and fuel permeation. In particular, SPAEK-PW12-13% achieved an enhanced proton conductivity of 0.167 S∙cm−1 at 80 °C, which was 2.2 times greater than that of the pristine membrane. Moreover, the mechanical properties, chemical stability, resistance to methanol penetration, and ionic selectivity of the hybrid membrane were significantly improved upon addition of a moderate amount of PW12. This work provides an approach for the design and development of new-generation organic–inorganic hybrid membranes through precise hybridization of POMs.

Keywords

polyoxometalatessulfonated polyaryletherketoneproton exchange membraneproton conduction

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Polyoxometalates
Volume 4 Issue 1,
March 2025
Article number: 9140079
DOI: 10.26599/POM.2024.9140079
Cite this article:
Hu B, Du Q, Yang Y, et al. Facile construction of polyoxometalate-modified polyaryletherketone-based hybrid membranes with enhanced proton conductivity. Polyoxometalates, 2025, 4(1): 9140079. https://doi.org/10.26599/POM.2024.9140079

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Received: 30 July 2024
Revised: 31 August 2024
Accepted: 11 September 2024
Published: 08 October 2024
© The Author(s) 2025. Published by Tsinghua University Press.

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