Jump to main content
Jump to site search


Marangoni convection at electrogenerated hydrogen bubbles

Author affiliations

Abstract

Electrolytic gas evolution is a fundamental phenomenon occurring in a large number of industrial applications. In these processes gas bubbles are formed at the electrode from a supersaturated solution. Since dissolved gases can change the surface tension, a gas concentration gradient may cause the surface tension to vary locally at the interface of the gas bubble. Surface tension gradients may also form due to temperature gradients generated by ohmic heating of the electrolyte. In both cases, the resulting shear stress imposes a convection in the electrolyte and the gas bubble (Marangoni effect). This phenomenon may influence the entire electrolytic gas evolution process, e.g., by an enhanced mass transfer. In this study, the first evidence of the Marangoni convection near growing hydrogen bubbles, generated by water electrolysis, is provided. Microscopic high speed imaging was applied to study the evolution of single hydrogen bubbles at a microelectrode. The convection near the interface of the growing bubble was measured by using a time-resolved Particle Tracking Velocimetry (PTV) technique. The results indicate a clear correlation between the magnitude of the Marangoni convection and the electric current.

Graphical abstract: Marangoni convection at electrogenerated hydrogen bubbles

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Feb 2018, accepted on 29 Mar 2018 and first published on 29 Mar 2018


Article type: Communication
DOI: 10.1039/C8CP01050A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
  •   Request permissions

    Marangoni convection at electrogenerated hydrogen bubbles

    X. Yang, D. Baczyzmalski, C. Cierpka, G. Mutschke and K. Eckert, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP01050A

Search articles by author

Spotlight

Advertisements