Dynamics of Single Hydrogen Bubbles at a Platinum Microelectrode.
Dynamics of Single Hydrogen Bubbles at a Platinum Microelectrode.
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DOI：
10.1021/acs.langmuir.5b01825
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Xuegeng Yang;Franziska Karnbach;M. Uhlemann;S. Odenbach;K. Eckert
中科院分区：
文献类型：
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作者：
Xuegeng Yang;Franziska Karnbach;M. Uhlemann;S. Odenbach;K. Eckert
在 1 M H2SO4 电解质电解过程中，在铂微电极上研究了气泡动力学，包括单个 H2 气泡的形成、生长和脱离。通过高速相机在显微镜下观察气泡。并行进行电化学测量以测量瞬态电流。由单个气泡的周期性形成和分离引起的周期性电流振荡允许根据瞬态电流来预测气泡寿命和尺寸。根据当前和记录的气泡图像计算的气泡体积的比较显示，气体逸出效率随着气泡的生长而不断增加，直到达到 100%。使用两种不同的基板（玻璃和环氧树脂）来嵌入铂丝。虽然气泡半径的生长规律几乎没有发现差异，但两种类型的细胞的接触角差异很大。为接触点演变提供的数据进一步完善了单个氢气泡生长的图像。最后，利用PIV测量了脱离气泡驱动的速度场，评估了对流对后续气泡的影响。
Bubble dynamics, including the formation, growth, and detachment, of single H2 bubbles was studied at a platinum microelectrode during the electrolysis of 1 M H2SO4 electrolyte. The bubbles were visualized through a microscope by a high-speed camera. Electrochemical measurements were conducted in parallel to measure the transient current. The periodic current oscillations, resulting from the periodic formation and detachment of single bubbles, allow the bubble lifetime and size to be predicted from the transient current. A comparison of the bubble volume calculated from the current and from the recorded bubble image shows a gas evolution efficiency increasing continuously with the growth of the bubble until it reaches 100%. Two different substrates, glass and epoxy, were used to embed the Pt wire. While nearly no difference was found with respect to the growth law for the bubble radius, the contact angle differs strongly for the two types of cell. Data provided for the contact point evolution further complete the image of single hydrogen bubble growth. Finally, the velocity field driven by the detached bubble was measured by means of PIV, and the effects of the convection on the subsequent bubble were evaluated.