论文标题
用扫描电子显微镜探测电液固化界面
Probing Electrified Liquid-Solid Interfaces with Scanning Electron Microscopy
论文作者
论文摘要
电气双层在各种电化学系统中起关键作用。水溶液中二次电子的平均自由路径在纳米级处，使其适合在固液电解质界面处探测超薄电气双层。在两电极电化学系统中，采用石墨烯作为电子透明电极，我们表明石墨烯 - 液体界面的二级电子产量取决于电解质的离子强度和浓度，并在远程计数器电极上施加了偏置。这些观察结果与极化诱导的电势分布的变化有关，并证明了使用扫描电子显微镜检查和绘制电气液固体接口的可行性
Electrical double layers play a key role in a variety of electrochemical systems. The mean free path of secondary electrons in aqueous solutions is on the order of a nanometer, making them suitable for probing of ultrathin electrical double layers at solid-liquid electrolyte interfaces. Employing graphene as an electron-transparent electrode in a two-electrode electrochemical system, we show that the secondary electron yield of the graphene-liquid interface depends on the ionic strength and concentration of electrolyte and applied bias at the remote counter electrode. These observations have been related to polarization-induced changes in the potential distribution within the electrical double layer and demonstrate the feasibility of using scanning electron microscopy to examine and map electrified liquid-solid interfaces
