<p>➀ A German-Dutch research team led by Helmholtz-Zentrum Dresden-Rossendorf (HZDR) discovered that hydrogen bubbles in electrolyzers contain electrolyte microdroplets, revealing internal flow dynamics for the first time; </p><p>➁ The study identified that gas bubbles merge and create microjets of electrolyte, forming droplet clouds that reduce efficiency by altering electrode contact and delaying bubble detachment; </p><p>➂ Findings, published in Nature Communications, provide insights into improving electrolyzer efficiency, with ongoing research funded by BMBF and NWO to address technical challenges.</p>