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Using a highly ion conductive, chemically stable, mechanically robust, reinforced anion exchange membrane (AEM) of nominal thickness 85 μm, we report an AEM water electrolyzer operating for longer than one year at 70 °C with 1 M KOH electrolyte, with H2 crossover below industrial limits. The minimal degradation observed is due to the membrane-electrode-assembly and not due to the membrane, which exhibits negligible change in its ionic conductivity after >1 yr operation. A minimal hydrogen crossover from cathode to anode of 7 months). This study shows that future research towards zero gap alkaline water electrolyzers should be directed to the development of active and stable catalysts and the formation and integration of stable catalyst layers tailored to AEM water electrolyzers.
Moreno-González et al. (Sun,) studied this question.