过电位
润湿
气泡
材料科学
多孔性
电极
多孔介质
化学工程
复合材料
机械
电化学
化学
工程类
物理
物理化学
作者
Ryuichi Iwata,Lenan Zhang,Kyle L. Wilke,Shuai Gong,Mingfu He,Betar M. Gallant,Evelyn N. Wang
出处
期刊:Joule
[Elsevier]
日期:2021-04-01
卷期号:5 (4): 887-900
被引量:135
标识
DOI:10.1016/j.joule.2021.02.015
摘要
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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