Removal of Gas Bubbles on an Electrode Using a Magnet,ACS Applied Energy Materials

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Removal of Gas Bubbles on an Electrode Using a Magnet
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-30 00:00:00 , DOI: 10.1021/acsaem.0c00890
Keliang Wang ₁ , Cheng Liao ₁ , Wei Wang ₁ , Yu Xiao ₁ , Xiaotian Liu ₁ , Yayu Zuo ₁

Affiliation

Oxygen evolution reaction is an enabling process of energy storage, metal extraction, and nature photosynthesis. Bubble growth on the electrode surface can block the reaction. Here, we present the use of a magnet to remove bubbles from the catalytic sites, reducing the activation overpotential in the electrochemical reaction. The results demonstrate that the directional migration of oxygen or hydrogen bubbles during water electrolysis can be achieved by the magnetic field, uncovering the transport mechanism of gas bubbles in oriented motion induced by Lorentz force and buoyancy. Increase of magnetic strength can speed up bubble shedding especially at large currents, inhibiting dendrite growth of electrodeposited metal. Moreover, the charging threshold would be lowered at the action of isotropy of Ni magnetic domains. Removal of bubbles absorbed at the electrode using the magnet would be beneficial for energy saving, surface quality of electrodeposited metal, and hydrogen production.

中文翻译：

使用磁铁去除电极上的气泡

氧气析出反应是能量存储，金属提取和自然光合作用的促成过程。电极表面的气泡生长会阻止反应。在这里，我们介绍了使用磁铁去除催化位点上的气泡，减少电化学反应中的活化超电势。结果表明，磁场作用可以实现水电解过程中氧气或氢气气泡的定向迁移，揭示了洛伦兹力和浮力引起的气泡在定向运动中的传输机理。磁性强度的提高可以加速气泡的脱落，特别是在大电流下，可以抑制电沉积金属的枝晶生长。而且，在Ni磁畴的各向同性的作用下，充电阈值将降低。

更新日期：2020-06-30

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