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使用拉曼光谱法探测单晶电极双层中的电场分布

Bao-Ying Wen¹, Jia-Sheng Lin¹, Yue-Jiao Zhang¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, College of Energy, Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society

|June 20, 2020

概括

研究人员使用拉曼光谱绘制了电双层 (EDL) 中的电场. 这种技术提供了安格斯特罗姆级别的分辨率,揭示了EDL结构和推进了电化学接口的理解.

科学领域:

电化学
表面科学
光谱学

背景情况:

电双层 (EDL) 对于电化学反应至关重要,但很难直接测量.
了解界面电场是电化学和表面科学中的关键.

研究的目的:

直接测量和绘制EDL内的电场分布.
实现电界电场的安格斯特罗姆级空间分辨率.

主要方法:

使用电化学共振拉曼光谱与氧化还原活性分子探针.
使用理论计算来分析电场分布.
使用自组装单层的原子平面单晶Au(111) 电极.

主要成果:

拉曼信号强度与电场强度和探针分子双极矩相关.
实现了电场映射的安格斯特罗姆级空间分辨率.
随着电场强度的增加,观察到拉曼强度的降低.

结论:

直接证明了电气双层的结构.
弥合了对电化学接口的理论和实验理解之间的差距.
展示了一种高分辨率界面电场映射的新方法.

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