A level-set method for hydrogen bubble growth on a microelectrode in water electrolysis

초록

Electrolytic hydrogen bubble dynamics were numerically investigated by extending level-set method to include dissolved gas diffusion, vapor phase change and electrochemical reactions. Both mass transfer of hydrogen gas dissolved in water and vapor mass flux due to evaporative phase change were accounted for in the macro-/micro-layer regions. Experimental data were utilized to implement a dynamic contact angle model, allowing for validation of bubble radius evolution over time. Parametric studies were conducted to analyze the effects of electrode surface temperature, constant current density and electrode radius on hydrogen bubble dynamics. The results provide a deeper understanding of interfacial phenomena and establish a robust framework for optimizing microelectrode designs in electrochemical systems. These findings advance the understanding of bubble dynamics and contribute to the development of more efficient electrolysis processes.

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