Spatially-Resolved Interfacial Electrochemistry: Ohmic Microscopy
Spatially-Resolved Interfacial Electrochemistry: Ohmic Microscopy
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空间分辨界面电化学：欧姆显微镜
DOI：
10.1021/jp8032726
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发表时间：
2008
影响因子：
3.7
通讯作者：
D. Scherson
中科院分区：
文献类型：
--
作者：
Youjiang Chen;A. Belianinov;D. Scherson
本文描述了一种方法，其允许电极处的空间分辨电容电流，|通过使用两个微参比电极监测电解质中的欧姆降Δφsol来原位记录电解质界面。使用Au和Pt作为单或双工作电极（即，彼此连接），在另外的常规三电极电化学电池中，在0.1M H2SO4水溶液中进行测量。Δφsol与E（双Au的电势）的关系图|在伏安循环期间记录的Pt电极相对于主参比电极的电流，产生具有Au特征的曲线|0.1 M H2SO4或Pt| 0.1 M H2SO4界面，这取决于微参比电极是否分别靠近Au或Pt电极表面放置。这种方法在微米域的测量扩展进行了简要讨论。
A method is herein described that allows spatially resolved capacitive currents at electrode|electrolyte interfaces to be recorded in situ by monitoring the ohmic drop in the electrolyte, Δφsol, using two microreference electrodes. Measurements were performed in 0.1 M H2SO4 aqueous solutions using Au and Pt either as single or dual working electrodes, that is, connected to one another, in an otherwise conventional three-electrode electrochemical cell. Plots of Δφsol versus E, the potential of the dual Au|Pt electrode with respect to the main reference electrode, recorded during voltammetric cycles, yielded curves bearing features characteristic of the Au|0.1 M H2SO4 or Pt|0.1 M H2SO4 interface depending on whether the microreference electrodes were placed close to the Au or Pt electrode surface, respectively. Extensions of this methodology to measurements in the micrometer domain are discussed briefly.