Pure Water Solid Alkaline Water Electrolyzer Using Fully Aromatic and High-Molecular-Weight Poly(fluorene-alt-tetrafluorophenylene)-trimethyl Ammonium Anion Exchange Membranes and Ionomers

The success of pure water solid alkaline water electrolysis (SAWE) technology currently depends on the use of polymer electrolytes exhibiting high OH– conductivity and long-term operational stability. To address these issues, the present study investigated SAWE employing anion exchange membranes and ionomers constructed from a fully aromatic and high-molecular-weight poly(fluorene-alt-tetrafluorophenylene) modified with trimethylammonium. High performances were achieved when the membrane–electrode assemblies (MEAs) fabricated with these polymer electrolytes were applied in pure water SAWE. Importantly, the developed MEAs were durable under water feed operation conditions, which involved a high cell temperature of 80 °C.