Citation: LIU Meng, GUO Xiang-Fei, WANG Jing-Ming, JIANG Lei. Behavior of Bubbles on Electrodes with Hierarchical Microporous Structures and Different Wettability[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201209262 shu

Behavior of Bubbles on Electrodes with Hierarchical Microporous Structures and Different Wettability

1.
1 School of Chemistry and Environment, Beihang University, Beijing 100191, P. R. China;
2 Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 6 September 2012
Available Online: 26 September 2012
Fund Project: 国家自然科学基金(20901006)资助项目 (20901006)

We have prepared copper electrodes by the hierarchical micropore hydrogen template method. By changing the plating current density and plating time, we can effectively control the size and distribution of the micropores. In addition, we altered the surface chemical composition to obtain electrodes with different wettability. The production and behavior of bubbles on the electrodes with different microstructures and wettability during the process of water electrolysis was investigated. The experimental results indicated that, compared with the hydrophilic porous electrode, the bubbles were able to pin onto the hydrophobic electrode more easily, and they tended to coalesce to form a stable gas film. The effect of the porous structure on the behavior of bubbles was more significant for hydrophilic electrodes than hydrophobic electrodes. The electrodes with hierarchical microporous structures preferred to produce more bubbles than those without microporous structures. The production rate of bubbles on the electrodes with hierarchical microporous structure was faster than that on the electrodes without. Furthermore, porous hydrophilic electrodes with large pore sizes could generate bubbles faster and pin smaller bubbles than electrodes with small pore sizes. We believe that these results can provide theoretical proof for the design of the electrodes with attached micro-bubbles to reduce drag resistance.
- Porous structure,
- Hydrophobicity,
- Electrolysis,
- Pin,
- Bubble,
- Drag reduction
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