They can be used to produce green hydrogen and convert carbon dioxide into feedstocks for the chemical industry. Electrolysis technologies have increasingly come into focus in the context of climate protection, energy and raw material change. The result: a plethora of catalyst candidates, almost none of which, however, has yet reached the stage of applicability. Marketable concepts for electrodes and cells are also still in short supply. Scientists from the Fraunhofer Institutes UMSICHT, ISE and ICT, the University of Duisburg-Essen, the Ruhr University Bochum, the Center for Fuel Cell Technology (ZBT) and the Danish company IRD Fuel Cells have investigated the reasons for this and what needs to change for electrolysis to become an industrial application. They have published their findings under the title "Crossing the Valley of Death: From Fundamental to Applied Research in Electrolysis" in the "Journal of American Chemistry Au".