Time-resolved determination of the potential of zero charge at polycrystalline Au/ionic liquid interfaces.
Time-resolved determination of the potential of zero charge at polycrystalline Au/ionic liquid interfaces.
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DOI：
10.1063/1.5016300
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
N. Vargas‐Barbosa;B. Roling
中科院分区：
文献类型：
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作者：
N. Vargas‐Barbosa;B. Roling
零电荷电位（PZC）是描述电极/电解质界面的基本性质。由于缺乏充分描述这些复杂界面的模型以及用于表征它们的非标准化方法，电极/离子液体界面处的PZC的测定一直具有挑战性。在这项工作中，我们提出了一种方法，结合电极浸入瞬态和阻抗测量的PZC的测定。这种组合的方法允许零自由电荷（pzfc）的电位的区别，涉及到毫秒时间尺度上的快速双层充电，从几十秒的时间尺度上的零电荷的电位有关的较慢的离子传输过程中的接口。我们的方法突出了这些电化学技术的互补性，以及选择正确的时间尺度来执行实验和解释结果的重要性。
The potential of zero charge (PZC) is a fundamental property that describes the electrode/electrolyte interface. The determination of the PZC at electrode/ionic liquid interfaces has been challenging due to the lack of models that fully describe these complex interfaces as well as the non-standardized approaches used to characterize them. In this work, we present a method that combines electrode immersion transient and impedance measurements for the determination of the PZC. This combined approach allows the distinction of the potential of zero free charge (pzfc), related to fast double layer charging on a millisecond timescale, from a potential of zero charge on a timescale of tens of seconds related to slower ion transport processes at the interface. Our method highlights the complementarity of these electrochemical techniques and the importance of selecting the correct timescale to execute experiments and interpret the results.