Li Mengxuan, Xie Pengpeng, Yu Linfeng, Luo Liang, Sun Xiaoming
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Nano. 2023 Dec 12;17(23):23299-23316. doi: 10.1021/acsnano.3c08831. Epub 2023 Nov 21.
Bubble behaviors play crucial roles in mass transfer and energy efficiency in gas evolution reactions. Combining multiscale structures and surface chemical compositions, micro-/nanostructured electrodes have drawn increasing attention. With the aim to identify the exciting opportunities and rationalize the electrode designs, in this review, we present our current comprehension of bubble engineering on micro-/nanostructured electrodes, focusing on water splitting. We first provide a brief introduction of gas wettability on micro-/nanostructured electrodes. Then we discuss the advantages of micro-/nanostructured electrodes for mass transfer (detailing the lowered overpotential, promoted supply of electrolyte, and faster bubble growth kinetics), localized electric field intensity, and electrode stability. Following that, we outline strategies for promoting bubble detachment and directional transportation. Finally, we offer our perspectives on this emerging field for future research directions.
气泡行为在气体析出反应的传质和能量效率中起着关键作用。结合多尺度结构和表面化学成分，微/纳米结构电极已越来越受到关注。为了识别令人兴奋的机遇并使电极设计合理化，在本综述中，我们阐述了目前对微/纳米结构电极上气泡工程的理解，重点是水分解。我们首先简要介绍微/纳米结构电极上的气体润湿性。然后我们讨论微/纳米结构电极在传质（详细说明降低的过电位、促进电解质供应和更快的气泡生长动力学）、局部电场强度和电极稳定性方面的优势。在此之后，我们概述了促进气泡脱离和定向传输的策略。最后，我们对这一新兴领域的未来研究方向发表了看法。
