A polymethacrylate-based quaternary ammonium OH− ionomer binder for non-precious metal alkaline anion exchange membrane water electrolysers

► A quaternary polymethacrylate ionomer with high OH− conductivity was synthesized. ► This ionomer is a promising binder for catalyst layers of AAEMWE. ► Current density of the WE achieved 100 mA cm−2 at 1.9 V with deionized water. ► The membrane electrode assembly demonstrated satisfactory stability.