Diamine crosslinked anion exchange membranes based on poly(vinyl benzyl methylpyrrolidinium) for alkaline water electrolysis

Huanhuan Li, Na Yu, Florian Gellrich, Alexander Kappel Reumert, Mikkel Rykær Kraglund, Jianhao Dong, David Aili*, Jingshuai Yang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

New chemically crosslinked anion exchange membranes are prepared for water electrolysis based on high ion conductive poly(vinyl benzyl methylpyrrolidinium) and rigid polysulfone. Eight bifunctional tertiary amines are screened as crosslinking agents to optimize the properties of membranes. The fabricated crosslinked membranes exhibit excellent chemical resistance towards radicals, and meanwhile possess improved decreased swelling, enhanced mechanical stability, suitable conductivity and improved alkali resistance stability. As typical candidates, membranes crosslinked by N,N,N′,N′-tetramethyl-1,6-hexanediamine, 4,4′-trimethylene-bis(1-methylpiperidine) and 1,4-bis(2-methylimidazol-1-yl)butane are down-selected for water electrolysis in 1 M KOH at 80 °C, and display current densities of 500 mA cm−2, 400 mA cm−2 and 600 mA cm−2 at 1.9 V using nickel alloys as electrodes without ionomer, respectively. Furthermore, the durability profile for the cell over one week at 500 mA cm−2 illustrates the potential of membranes working in mildly alkaline conditions.
Original languageEnglish
Article number119418
JournalJournal of Membrane Science
ISSN0376-7388
DOIs
Publication statusAccepted/In press - 2021

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