Abstract
Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources. However, the performance of AEM electrolysis is still lower than what can be achieved with conventional technologies. Materials chemistry, MEA designs, and optimal operation conditions have driven recent advancements. Majority of the AEM research has focused on improving ionic conductivity and alkaline stability. Many AEMs exceed 0.1 S/cm (at 60–80 °C), however stability at temperatures above 60 °C needs improvement. Oxygen evolution reaction OER remains a bottleneck. The active-site mechanism of NiFe catalysts is disputed, and their long-term stability is unknown. Co boosts NiFe catalyst conductivity. Carbon-supported Pt dominates the hydrogen evolution process (HER), whereas PtNi alloys and clusters of Ni(OH)2 on Pt compete. Well-dispersed Ru nanoparticles on functionalized high-surface-area carbon substrates show promising HER actions. New in situ methods, AEMWE evaluation processes, and catalyst-structure designs could help the field advance faster. Nonetheless, single AEM water electrolyzer cells have operated for several thousand hours at 60 °C and 1 A/cm2.
Published Version
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