In the framework of reaching the climate neutrality by 2050, hydrogen can play an important role because it can be used in different sectors and it does not emit air pollution compounds when used. In order to obtain hydrogen from low-emission processes, the water electrolysis technologies, which are able to exploit the electricity that comes from renewables, are promising techniques. In this context, the proton exchange membrane electrolysers present different advantages that make them suitable for the coupling with renewables and being, therefore, an interesting technique for the production of low-emission hydrogen. However, in the hydrogen production chain, there is a series of components that need to be considered in addition to the electrolyser.