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    Rights statement: This is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, 46, 75, 2021 DOI: 10.1016/j.ijhydene.2021.09.014

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Highly conductive partially cross-linked poly(2,6-dimethyl-1,4-phenylene oxide) as anion exchange membrane and ionomer for water electrolysis

Research output: Contribution to journalJournal articlepeer-review

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  • Zhiming Feng
  • Pilar Esteban
  • Gaurav Gupta
  • David Fulton
  • Mohamed Mamlouk
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<mark>Journal publication date</mark>29/10/2021
<mark>Journal</mark>International Journal of Hydrogen Energy
Issue number75
Volume46
Number of pages15
Pages (from-to)37137-37151
Publication StatusPublished
Early online date24/09/21
<mark>Original language</mark>English

Abstract

Cross-linked quaternised Poly(2,6-dimethyl-1,4-Phenylene Oxide) (QPPO)-based membranes were prepared via Friedel-Crafts reactions using SnCl4 catalyst, 1,3,5-trioxane and chlorotrimethylsilane as environmentally-friendly chloromethylating reagents. New equations to calculate the degree of chloromethylation (DC) and cross-linking degree (CLD) were proposed. Ionic conductivity of 133 mS cm−1 at 80 °C was obtained, one of the highest reported for QPPO based membranes. We have compared QPPO to chloromethylated polystyrene-b-poly(ethylene/butylene)-b-polystyrene (SEBS) ionomer and report on the importance of ionomer-membrane interaction as well as the trade-off between swelling ratio and conductivity on performance and mechanical stability of AEM water electrolyser. Exsitu stability testing after 500 h in 1 M KOH showed membranes retained up to 94% of their original IEC. QPPO was employed as both membranes and ionomers in electrolyser tests. QPPO membranes exhibited area specific resistance of 104 mΩ cm−2 and electrolyser current density of 814 mA cm−2 at 2.0 V in 0.1 M NaOH solution at 40 °C.

Bibliographic note

This is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, 46, 75, 2021 DOI: 10.1016/j.ijhydene.2021.09.014