电化学氧化和还原的电极的结构重组
Martin Ruge1, Jakub Drnec2, Björn Rahn1
1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel , Olshausenstraße 40, 24098 Kiel, Germany.
Journal of the American Chemical Society
|March 3, 2017
概括
使用先进技术研究了 (Pt) 电极的表面重组. 在电化学循环中,纳米规模的Pt岛屿形成和演变,表现出类似于真空条件的行为.
科学领域:
- 电化学
- 表面科学
- 材料科学
背景情况:
- (Pt) 电极在电催化过程中至关重要.
- 了解表面重组是电极稳定性和性能的关键.
- 电化学氧化/还原循环可以改变电极形态.
研究的目的:
- 在电化学循环过程中研究Pt(111) 电极的表面重组.
- 量化确定纳米级Pt岛屿的形成和演变.
- 将电化学表面动力与真空现象进行比较.
主要方法:
- 在现场放牧发生小角度X射线散射 (GISAXS).
- 扫描道显微镜 (STM).
- 在0.1M HClO4中进行电化学电位循环.
主要成果:
- 纳米级Pt岛屿形成和生长的定量确定.
- 观察到的成熟行为导致更突出的和同质的岛屿与骑自行车.
- 岛屿尺寸主要取决于潜在的上限,周期数量略有增加.
结论:
- Pt的电化学表面重组显示了成熟行为.
- 观察到的结构演变与真空下Pt{111}同位素增长和离子侵蚀相似.
- 一个基于真空表面动态的微观模型成功地解释了Pt的电化学结构演变.
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