Electrokinetic Streaming Current Method to Probe Polycrystalline Gold Electrode-Electrolyte Interface Under Applied Potentials

Electrokinetic Streaming Current Method to Probe Polycrystalline Gold Electrode-Electrolyte Interface Under Applied Potentials
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动电流法探测外加电位下多晶金电极-电解质界面

DOI:
10.1149/1945-7111/abf4aa
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发表时间:
2021
影响因子:
3.9
通讯作者:
Zenyuk, Iryna V.
Zenyuk, Iryna V.
中科院分区:
工程技术4区
文献类型:
--
作者:
Saha, Prantik;Zenyuk, Iryna V.

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采用电化学流动电流技术和动电流动电流技术相结合的方法,研究了恒电位仪在金属表面施加电位时,金属-电解质界面电化学双电层扩散部分的离子分布和离子电导率。我们将这种方法应用到电化学清洁多晶金(聚Au)-电解质界面和测量zeta电位为各种施加的电位,pH值,和浓度的电解质。通过比较KCl和KClO 4电解液中的zeta电位,研究了氯离子在聚Au上的特异性吸附。在特定吸附的情况下,zeta电位被发现与施加的电位线性增加,具有0.04-0.06的斜率。当发生Cl−吸附时,zeta电位在0.750 mV(相对于Ag/AgCl施加的电位)时从正值变为负值。进行互补循环伏安法和X射线光电子能谱研究以确定聚Au上的氯离子吸附程度。在zeta电位为零的施加电位和聚Au的零电荷电位之间观察到相关性。扩散层中的离子分布和离子电导率由使用非线性Poisson-Boltzmann分布测量的zeta电位数据计算。
We developed a method, by combining electrochemical and electrokinetic streaming current techniques to study ion distribution and ionic conductivity in the diffuse part of electrochemical double layer (EDL) of a metal-electrolyte interface, when potential is applied on the metal by a potentiostat. We applied this method to an electrochemically clean polycrystalline gold (poly Au)-electrolyte interface and measured zeta potential for various applied potentials, pH, and concentration of the electrolyte. Specific adsorption of chloride ions on poly Au was studied by comparing measurements of zeta potential in KCl and KClO 4 electrolytes. In absence of specific adsorption, zeta potential was found to increase linearly with applied potential, having slope of 0.04–0.06. When Cl− adsorption occurs, zeta potential changes the sign from positive to negative value at∼ 750 mV vs Ag/AgCl applied potential. Complementary cyclic voltammetry and X-ray photoelectron spectroscopy studies were conducted to determine a degree of chloride ion adsorption on a poly Au. A correlation was observed between the applied potential at which zeta potential is zero and potential of zero charge for poly Au. Ion-distribution and ionic conductivity in the diffuse layer were calculated from the measured zeta potential data using nonlinear Poisson-Boltzmann distribution.
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