Growth and Dynamics of Hydrogen Bubbles at Microelectrodes

The evolution and dynamics of gas bubbles has a strong impact on the efficiency
of water electrolysis. Our poster will summarize recent work of our group on the
hydrogen evolution at a microelectrode in acidic electrolytes. Depending on
the applied potential and the electrolyte concentration, three different growth
regimes are identified, among them oscillatory growth above a carpet of
microbubbles. The discussion of the force balance of the bubbles includes
thermocapillary effects and an electric force caused by charge adsorption
at the interface.