Non conventional water sources for hydrogen production

Hydrogen generation is seen as a promising solution for energy flexibility and decarbonization, but it poses a resource problem, since hydrogen generation requires extremely pure water for its application in conventional electrolysis technologies (alkaline, PEM). High Temperature Electrolysis works above 600ºC, so it can be theoretically applied with non conventional water sources (wastewater, rainwater, grey water). However, further research on evaporation systems and water treatment is needed.