- Wed Feb 4 (room reservation 16:00 JST [=UTC+09:00]), ELSI-1 105 Mishima Hall [Seminar] ELSI Seminar - Sunghak Park Sunghak Park Department of Future Energy Engineering, Sungkyunkwan University Title: Understanding and modulating gas bubble dynamics at electrochemical interfaces Abstract: Electrochemical gas evolution reactions, such as water splitting for clean hydrogen production, are pivotal for advancing sustainable energy systems. Under practical high-current-density conditions, gas bubble formation at the electrode/electrolyte interface is unavoidable due to high local supersaturation. These bubbles significantly influence electrochemical performance via various pathways, including surface concentration field alteration, current pathway disruption, blockage of active sites, and induction of convective flow [1,2,3]. Despite their importance, engineering this complex electrode/electrolyte/gas bubble interface remains a formidable challenge due to the stochastic interplay and collective dynamics of concurrently evolving bubbles. Recent advancements in microelectrodes and nanoelectrodes fabrication have enabled the spatial restriction of nucleation events, allowing for the isolated study of single gas bubble dynamics [4,5]. This approach facilitates a more precise analysis of bubble evolution processes under well-controlled conditions. In this talk, I will present our recent efforts to investigate gas bubble dynamics using well-defined Pt microelectrodes and the electrochemical water splitting reaction as a model system. By correlating interfacial parameters with bubble behaviour, we provide a detailed look at how the local microenvironment dictates bubble dynamics. Finally, I would like to share some thoughts on future directions, specifically regarding the unique physiochemical environment at the bubble interface and the potential for modulating chemical reactivity by utilizing gas bubbles as a ‘controllable knob’ at the electrochemical interface. References 1. Zhao, X., Ren, H., Luo, L. Gas bubbles in electrochemical gas evolution reactions. Langmuir 35, 5392–5408 (2019). 2. Angulo, A., van der Linde, P., Gardeniers, H., Modestino, M. & Fernández Rivas, D. Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors. Joule 4, 555–579 (2020). 3. Park, J., Kim, M. J., Kim, Y., Lee, S., Park, S. & Yang, W. Insights into Bubble Dynamics in Water Splitting. ACS Energy Lett. 10, 212-237 (2025). 4. Luo, L. & White, H. S. Electrogeneration of single nanobubbles at sub-50-nm-radius platinum nanodisk electrodes. Langmuir 29, 11169–11175 (2013). 5. Yang, X., Baczyzmalski, D., Cierpka, C., Mutschke, G. & Eckert, K. Marangoni convection at electrogenerated hydrogen bubbles. Phys. Chem. Chem. Phys. 20, 11542-11548 (2018). - Fri Feb 6 (room reservation 14:00 JST [=UTC+09:00]), ELSI-1 207 Seminar Room B [Study Group] Metabolism Hour - Fri Feb 6 (room reservation 15:00 JST [=UTC+09:00]), ELSI-1 207 Seminar Room B [Study Group] Protein language model hour A journal club about machine learning and proteins