Bashkatov Aleksandr, Hossain Syed Sahil, Mutschke Gerd, Yang Xuegeng, Rox Hannes, Weidinger Inez M, Eckert Kerstin
Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden, 01328, Germany.
Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Dresden, 01062, Germany.
Phys Chem Chem Phys. 2022 Nov 9;24(43):26738-26752. doi: 10.1039/d2cp02092k.
The growth of single hydrogen bubbles at micro-electrodes is studied in an acidic electrolyte over a wide range of concentrations and cathodic potentials. New bubble growth regimes have been identified which differ in terms of whether the bubble evolution proceeds in the presence of a monotonic or oscillatory variation in the electric current and a carpet of microbubbles underneath the bubble. Key features such as the growth law of the bubble radius, the dynamics of the microbubble carpet, the onset time of the oscillations and the oscillation frequencies have been characterized as a function of the concentration and electric potential. Furthermore, the system's response to jumps in the cathodic potential has been studied. Based on the analysis of the forces involved and their scaling with the concentration, potential and electric current, a sound hypothesis is formulated regarding the mechanisms underlying the micro-bubble carpet and oscillations.
在酸性电解质中，于较宽的浓度范围和阴极电位下研究了微电极上单氢气泡的生长情况。已识别出新型气泡生长模式，这些模式在气泡演化过程中电流是单调变化还是振荡变化以及气泡下方微气泡毯的存在与否方面存在差异。诸如气泡半径的生长规律、微气泡毯的动力学、振荡起始时间和振荡频率等关键特征已被表征为浓度和电位的函数。此外，还研究了该系统对阴极电位跃变的响应。基于对所涉及力及其与浓度、电位和电流的标度关系的分析，针对微气泡毯和振荡背后的机制提出了一个合理的假设。
