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arXiv 2306.10331physics.flu-dyn
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电解气泡脱离的最小电流

Minimum current for detachment of electrolytic bubbles

Yixin Zhang, Detlef Lohse

发表信息：
jfm.2023.898
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AI总结：

本研究通过分子动力学模拟和理论分析，揭示了电解纳米气泡在不同电流下的生长与脱离机制，并推导出气泡脱离所需的最小电流条件。

摘要：

水电解的效率受到电极上微纳米气泡生成的显著影响。本文采用分子动力学模拟研究纳米电极上单个电解纳米气泡的动力学行为。模拟结果表明，根据电流值的大小，成核的纳米气泡要么生长至平衡状态，要么无限生长后脱离。为了解释这些发现，通过将电解气体通量纳入纳米气泡接触线并采用真实气体定律，对表面纳米气泡的稳定性理论进行了推广，从而准确预测了数值观察到的纳米气泡瞬态生长和稳态。利用该理论，还可以解析推导出气泡脱离所需的最小电流。在脱离状态下，纳米气泡的半径首先按 $R\propto t^{1/2}$ 增长，随后按 $R\propto t^{1/3}$ 增长，直至气泡脱离。

英文摘要：

The efficiency of water electrolysis is significantly impacted by the generation of micro- and nanobubbles on the electrodes. Here molecular dynamics simulations are used to investigate the dynamics of single electrolytic nanobubbles on nanoelectrodes. The simulations reveal that, depending on the value of current, nucleated nanobubbles either grow to an equilibrium state or grow unlimitedly and then detach. To account for these findings, the stability theory for surface nanobubbles is generalized by incorporating the electrolytic gas influx at the nanobubble's contact line and adopting a real gas law, leading to accurate predictions for the numerically observed transient growth and stationary states of the nanobubbles. With this theory, the minimum current for bubble detachment can also be analytically derived. In the detachment regime, the radius of the nanobubble first increases as $R\propto t^{1/2}$ and then as $R\propto t^{1/3}$, up to bubble detachment.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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