Electrolysers play a crucial role in the energy transition by producing hydrogen through water electrolysis. However, the process currently consumes excessive electricity due to the formation of gas bubbles that reduce efficiency. A joint German-Dutch research team, spearheaded by the Helmholtz-Zentrum Dresden-Rossendorf (HZDR), has made significant progress in understanding the dynamics of hydrogen bubbles inside electrolysers. Their study, published in Nature Communications, unveiled that these bubbles can contain micro-droplets of electrolyte, such as potassium hydroxide solution. This discovery provides deeper insights into the physico-chemical and hydrodynamic processes of electrolysis. By employing innovative optical methods, the team could observe the flows within the gas bubbles through the movement of these droplets. Subsequent experiments and simulations helped elucidate how electrolyte infiltrates gas bubbles, affecting the electrolysis process. The researchers noted swirling currents inside and outside the bubbles, driven by a thermal Marangoni effect, influencing the interface between gas and electrolyte. This newfound phenomenon poses both challenges and opportunities for electrolyser technology. Prof. Kerstin Eckert, Director at HZDR, emphasized the importance of comprehending gas bubble dynamics to enhance electrolyser efficiency. The team's work has laid the foundation for the ALKALAMIT project, supported by German and Dutch research bodies, to further explore and optimize electrolysis mechanisms. Their findings are pivotal for advancing hydrogen production technologies and fostering a sustainable energy landscape.