Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

Water electrolysis offers a way to produce hydrogen from renewable electrical energy.
However, the details of gas evolution have a major impact on the energy efficiency of the process,
as gas bubbles growing at the electrodes or floating in the electrolyte cause overvoltages and losses.
It is therefore desirable to improve our understanding of gas evolution in order to further improve
electrolysis processes.
Gas evolution is influenced by a number of aspects, including electrolyte supersaturation and constitution,
nucleation and wetting at the electrode, electrolyte flow, interfacial flow and capillary effects,
coalescence with neighboring gas bubbles as well as temperature and electric fields.
The presentation will summarize the knowledge gained in recent years, based on own work and recent literature.