The production of hydrogen using anion exchange membrane water electrolysis (AEMWE) is a promising technology for the storage of large quantities of electricity. Some AEMWE systems are already commercially available, but their deployment is hindered by the lack of understanding of the factors which limit their durability. The proposed work aims therefore to study, at single-cell level, degradation phenomena given rise to by, among other factors, the intermittant nature of electrolyser operation when powered using renewable energy sources. This study will focus on the mechanisms (thermal, fluidic, (electro)chemical) responsible for degradation of the various cell components. It will utilise test facilities available at CEA, and be enriched by the modelisation of physical degradation mechanisms for integration into a digital code. Real electrolysers need to be able to function for several years, so an early task in this work will be the definition of accelerated stress test (AST) protocols which will precipitate degradation in a targeted fashion, and in a relatively short space of time. Electrochemical data produced during these ASTs will be followed by post-test physical characterisation (XPS, XRD, SEM) of component microstructure, in order to elucidate degradation mechanisms.