| 作成者 |
|
|
|
|
|
|
|
|
|
|
|
| 本文言語 |
|
| 出版者 |
|
| 利用開始日 |
|
| 発行日 |
|
| 収録物名 |
|
| 巻 |
|
| 開始ページ |
|
| 出版タイプ |
|
| アクセス権 |
|
| 関連DOI |
|
| 関連HDL |
|
| 概要 |
Understanding the formation mechanisms of nanometer-sized bubbles (nanobubbles) on electrodes is essential for optimizing electrochemical gas evolution reaction. Here, we used high-speed atomic force ...microscopy to visualize the nucleation, growth, and dissolution of nanobubbles, micropancakes, and nanobubble-on-pancake structures during potential sweeps. An adsorbed gas layer initially covered the graphite–water interface and transformed into micropancakes under anodic sweeps within the non-Faradaic region. These micropancakes served as preferential nucleation sites for electrochemically generated O_2 and CO_2 nanobubbles, resulting in nanobubble-on-pancake structures. In contrast, under cathodic potentials, only H_2 nanobubbles nucleated directly on the adsorbed gas layer without forming micropancakes. Based on lateral mobility, they were categorized as either dynamic or static, which led to distinct growth–shrinkage responses to potential changes. Furthermore, the lifetimes of electrolytic nanobubbles (tens of seconds) were significantly longer than classical theoretical predictions (sub-millisecond), yet shorter than previously reported air nanobubbles (hours). We propose that their moderate lifetime is governed by a kinetic balance of gas fluxes sustained by high local supersaturation, together with potential-induced changes in interfacial tension that weaken contact-line pinning and thus limit stability. These findings redefine nanoscale solid–gas–liquid interfacial behavior and offer new directions for hydrogen energy devices.続きを見る
|
Mendeley出力
