Electrokinetic Streaming-Current Methods to Probe the Electrode–Electrolyte Interface under Applied Potentials
Electrokinetic Streaming-Current Methods to Probe the Electrode–Electrolyte Interface under Applied Potentials
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DOI：
10.1021/acs.jpcc.9b03430
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Prantik Saha;Changwoo Nam;M. Hickner;I. Zenyuk
中科院分区：
文献类型：
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作者：
Prantik Saha;Changwoo Nam;M. Hickner;I. Zenyuk
在金属与电解质的带电界面处，扩散层中的离子浓度与本体不同，受金属电荷的影响。双层结构可以显著提高局部离子电导率。理解与传统的电化学测量的电导率增强是具有挑战性的，然而电动实验可以更有用的探测局部离子电导率。我们使用流动电流实验的pH值范围内，以测量在金属-电解质界面的zeta电位。我们通过将三电极电化学电池的金属的电位可以变化的方法。通过使用-200至800 mV（相对于标准氢电极）之间的施加电位范围，我们探索了Au电极的表面充电如何影响zeta电位。在ζ电位相对于施加电位的曲线图上观察到拐点，并且该点被认为是电极的零电荷电位。使用G…
At an electrified interface of metal and electrolyte ion concentration in diffuse layer is different from the bulk and is impacted by metal charge. The double layer structure can significantly enhance local ionic conductivity. Understanding the conductivity enhancement with conventional electrochemical measurements is challenging, however electrokinetic experiments can be more useful in probing local ionic conductivities. We used streaming current experiments for a range of pH values to measure zeta potential at metal-electrolyte interfaces. We extend the method by incorporating a three-electrode electrochemical cell where the potential of the metal can be varied. By using a range of applied potentials between -200 and 800 mV (vs. standard hydrogen electrode) we explored how surface charging of Au electrode affects zeta potential. An inflection point is observed on the plot of zeta potential against applied potential and this point is believed to be a potential of zero charge of the electrode. Using the G...