期刊
JOULE
卷 5, 期 4, 页码 887-900出版社
CELL PRESS
DOI: 10.1016/j.joule.2021.02.015
关键词
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资金
- Toyota Central RD Labs
- Singapore-MIT Alliance for Research and Technology (SMART) LEES Program
- US-Egypt Science and Technology Joint Fund
- National Natural Science Foundation of China [51706135, 51521004]
- Shanghai Pujiang Program [20PJ1406800]
- National Science Foundation
The study investigates the impact of wettability on bubble dynamics and overpotential in gas-evolving porous electrodes, revealing that changes in wettability lead to alterations in bubble dynamics and a significant increase in overpotential.
A SUMMARY Bubble growth and departure are ubiquitous phenomena in gas-evolving reactions, which govern the overall energy and mass transport. However, an in-depth understanding of the relationship between bubble dynamics and the electrochemical processes, in particular, the wettability effect on a gas-evolving porous electrode remains elusive. Here, we report the bubble dynamics and overpotential observed during alkaline water splitting on a polytetrafluoroethylene (PTFE) deposited nickel porous electrode. A slight decrease in hydrophilicity induced a drastic transition of bubble dynamics and a significant increase of the transport overpotential. We show that the porous electrode transitioned from a liquid-filled state to a gas-filled state when varying the wettability, which changed the bubble departure sizes and bubble coverage. As a result, there were substantial changes of the transport overpotential. Our work elucidates the fundamental relationship between wettability and water splitting characteristics, which provides a practical scenario for structuring the electrode for gas-evolving reactions.
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