On the Electrolyte Convection around a Hydrogen Bubble Evolving at a Microelectrode under the Influence of a Magnetic Field
On the Electrolyte Convection around a Hydrogen Bubble Evolving at a Microelectrode under the Influence of a Magnetic Field
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DOI：
10.1149/2.0381609jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Cierpka, Christian
中科院分区：
文献类型：
--
作者：
Baczyzmalski, Dominik;Karnbach, Franziska;Cierpka, Christian
在垂直于水平微电极（直径100μm）的磁场存在下，在不同的恒电位条件下，在1M H2SO4 溶液中进行水电解。研究了围绕不断演化的氢气泡施加的磁流体动力学（MHD）电解质流，以阐明对气泡从电极分离以及向电极的质量传递的影响。应用不同的粒子成像和跟踪技术来测量细胞主体以及不断演化的气泡附近的三维流动。通过测量电流振荡和显微高速成像来分析周期性气泡生长周期。此外，还进行了流动数值研究以支持实验结果。结果表明，MHD 流动仅对气泡施加很小的稳定力。然而，观察到的二次流增强了向电极的质量传递，并可能减少溶解氢的局部过饱和。 (C) 作者 2016 年。ECS 出版。版权所有。
Water electrolysis was carried out in a 1 M H2SO4 solution under different potentiostatic conditions in the presence of a magnetic field oriented normal to the horizontal microelectrode (100 mu m in diameter). The imposed magnetohydrodynamic (MHD) electrolyte flow around the evolving hydrogen bubble was studied to clarify the effect on the detachment of the bubble from the electrode and the mass transfer toward the electrode. Different particle imaging and tracking techniques were applied to measure the three-dimensional flow in the bulk of the cell as well as in close vicinity of the evolving bubble. The periodic bubble growth cycle was analyzed by measurements of the current oscillations and microscopic high-speed imaging. In addition, a numerical study of the flow was conducted to support the experimental results. The results demonstrate that the MHD flow imposes only a small stabilizing force on the bubble. However, the observed secondary flow enhances the mass transfer toward the electrode and may reduce the local supersaturation of dissolved hydrogen. (C) The Author(s) 2016. Published by ECS. All rights reserved.