Control of hydrogen bubble plume during electrolysis of water
Control of hydrogen bubble plume during electrolysis of water
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DOI：
10.1088/2399-6528/ab0c30
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发表时间：
2019-03
影响因子：
1.2
通讯作者：
K. Matsuura;Y. Yamanishi;C. Guan;S. Yanase
中科院分区：
文献类型：
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作者：
K. Matsuura;Y. Yamanishi;C. Guan;S. Yanase
电解过程中阴极产生氢气气泡羽流。羽流形成机制有助于控制气泡直径和溶剂中的排列。使用高速显微镜观察自来水和盐水中电极产生的氢气泡（HB）和氧气泡（OB）。从获得的显微图像中分析气泡直径的变化，并比较 HB 和 OB 的生长动力学。结果表明，羽流的形成主要取决于水的离子强度，而不是电极的电压。羽流中的 HB 直径变化与自来水中距阴极的距离成正比。在盐水中没有观察到 HB 直径和距阴极距离之间的这种相关性。通过同时观察附着在电极上的HB和OB，HB直径的增加速度快于OB。 HBs和OBs的动力学性质分别与(time)1/2和(time)1成正比，表明过饱和氢气的扩散和OB表面的压力差占主导地位。基于这些结果，HB羽流的形成是由HB比OB更低的气体溶解度和质量密度决定的，并且由电压和水的离子强度控制。
Hydrogen bubble plumes are generated from the cathode during electrolysis. The plume formation mechanism contributes to the control of bubble diameters and alignment in solvent. The generation of hydrogen bubbles (HBs) and oxygen bubbles (OBs) from electrodes was observed in tap water and saline using a high-speed microscope. Bubble diameter changes were analysed from the obtained microscopic images, and the growth kinetics of HBs and OBs were compared. The result showed that plume formation was primarily dependent on ion strength of water and not voltage to the electrode. HB diameter change in plume was proportional to the distance from the cathode in tap water. Such correlation between HB diameter and distance from the cathode was not observed in saline. By simultaneous observation of HBs and OBs attached to the electrodes, the increase in HB diameter was faster than that of OB. The kinetic properties in HBs and OBs were proportional to (time)1/2 and (time)1, respectively, suggesting that the diffusion of oversaturated hydrogen gas and pressure difference at OB surfaces were dominant. Based on these results, HB plume formation was determined by the lower gas solubility and mass density of HB than that of OB, as well as controlled by voltage and ionic strength of water.