"Double multi-cation" composite membrane with surface-functionalized zirconia nanoparticle of highly improved ionic conductivity and chemical stability for anion exchange membrane water electrolysis
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Recently, anion exchange membrane water electrolysis (AEMWE) for clean hydrogen production with noble metal-free catalysts is gaining attention as a more eco-friendly and cost-effective option for producing green hydrogen than the proton exchange membrane water electrolysis (PEMWE) system, which contains expensive noble metal catalysts. Anion exchange membrane (AEM), the core element of AEMWE, has some challenges to overcome such as improvement of ionic conductivity and chemical stability in the alkaline medium. In this study, we constructed an AEM composite comprised of multi-cation functionalized zirconia nanoparticles, embedded in a polymer without an ether bond. Hydroxide ion conductivity and chemical stability were significantly improved by the multi-cation functional group in the composite and the Lewis acidity of zirconia nanoparticles, respectively. Due to its exceptional performance, the composite membrane we developed can be presented as a superb candidate for the future water electrolysis system.