MADAGASII
Contact person:
Prof. Dr. et Ing. habil. Kerstin Eckert
Person involved:
Funding agency: DLR (Deutsches Zentrum für Luft- und Raumfahrt)
Project number: 50WM2058
Project period: 01.09.2020 – 31.08.2023
Profile:
The project is dedicated to the detailed study of the dynamics of single hydrogen bubbles produced in water electrolysis at microelectrodes. The main focus is on the bubble growth and detachment processes [1] which are interconnected with bubble- bubble and bubble-carpet interaction [1], Marangoni convection [2,3,4], electrostatic effect [5,6], etc.
For this purpose, the experimental, numerical, and theoretical approaches are developed. The experimental part includes electrochemical and optical methods (microscopic shadowgraphy and PIV), successfully implemented both in terrestrial and in a microgravity environment during the parabolic flights [7]. Mathematical models developed are implemented in COMSOL.
Publications:
[1] Bashkatov, Aleksandr, et al. "Extreme growth regimes of hydrogen bubbles at Pt microelectrodes.“ In submission.
[2] Yang, Xuegeng, et al. "Marangoni convection at electrogenerated hydrogen bubbles." Physical Chemistry Chemical Physics 20.17 (2018): 11542-11548.
[3] Massing, Julian, et al. "Thermocapillary convection during hydrogen evolution at microelectrodes." Electrochimica Acta 297 (2019): 929-940.
[4] Hossain, Syed Sahil, et al. "The thermocapillary effect on gas bubbles growing on electrodes of different sizes." Electrochimica Acta 353 (2020): 136461.
[5] Bashkatov, Aleksandr, et al. "Oscillating hydrogen bubbles at pt microelectrodes." Physical review letters 123.21 (2019): 214503.
[6] Hossain, Syed Sahil, et al. "Improved understanding of electrolytic bubble dynamics.“ In preparation.
[7] Bashkatov, Aleksandr, et al. "Dynamics of single hydrogen bubbles at Pt microelectrodes in microgravity." Physical Chemistry Chemical Physics 23.20 (2021): 11818-11830.