A collaborative effort involving researchers from TU Berlin, Helmholtz Center Berlin, University of Freiburg's Institute of Microsystems Technology (IMTEK), and Siemens Energy has led to a groundbreaking development in the field of water electrolysis. The team introduced a highly efficient alkaline membrane electrolyzer in the journal 'Nature Catalysis,' showcasing advancements in catalyst materials and membrane electrode assemblies. By utilizing nickel double hydroxide compounds and innovative coating processes, the electrolyzer aims to achieve hydrogen production efficiency comparable to traditional proton exchange membrane (PEM) electrolyzers. Through operando measurements at the Berlin Bessy II X-ray source, researchers gained insights into catalytic-chemical processes on the catalyst-coated membrane. These findings were further analyzed in collaboration with theory experts from Singapore and the US, revealing crucial details about the catalytic mechanisms of the new nickel-based electrode materials. Peter Strasser highlighted the significance of the gamma phase in the catalyst, showcasing competitive performance with iridium while presenting unique molecular differences. This study not only enhances the fundamental understanding of catalytic mechanisms but also paves the way for more sustainable and efficient hydrogen production technologies.