粗糙度与十二烷基硫酸钠对微电极表面氢气泡演变行为的影响

uring water electrolysis for hydrogen production, hydrogen bubbles generated on the electrode surface can cover partial active regions, reducing the effective contact area between the electrode and electrolyte, thereby increasing reaction overpotential and lowering energy conversion efficiency. To optimize this process, it is crucial to investigate the synergistic regulation mechanism of electrode surface roughness and surfactant concentration on bubble behavior. In this study, nickel microelectrodes with varying surface roughness were fabricated, and the dynamic behaviors of bubble growth and detachment, along with their influencing factors, were systematically examined by adjusting sodium dodecyl sulfate (SDS) concentration. Experimental results indicate that as SDS concentration increases, the detachment radius and growth time of bubbles on electrodes with different roughness levels significantly decrease, while the bubble growth time factor remains stable at approximately 0.333, confirming that the growth process is predominantly controlled by electrochemical reaction kinetics. Further research reveals that increasing electrode surface roughness enhances active site density, effectively promoting SDS adsorption on the electrode surface. Meanwhile, SDS reduces the surface tension of the electrolyte through synergistic effects, enabling bubbles to meet detachment criteria at smaller radii. These findings demonstrate that rational regulation of electrode surface roughness and surfactant concentration can effectively optimize bubble detachment behavior, providing actionable strategies to improve the efficiency of water electrolysis for hydrogen production.