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首页> 外文期刊>Journal of industrial and engineering chemistry >Impedance characteristics and electrical double-layer capacitance of composite polystyrene-cobalt-arsenate membrane
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Impedance characteristics and electrical double-layer capacitance of composite polystyrene-cobalt-arsenate membrane

机译：聚苯乙烯-钴-砷酸盐复合膜的阻抗特性和双电层电容

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摘要

In continuation of our previous work with composite polystyrene-cobalt-arsenate (PS-Co-As), we further extended impedance measurements. All calculations reported were extracted from experiments carried out in the frequency range of 1 -5 kHz and different concentrations (0.0001 ≤ c(M)≤ 1) of KCl and NaCl at isothermal temperature (25 ± 0.1 °C). The membrane capacitance and resistance measurements were observed to depend on the concentration and the applied frequency of the electrolyte. The observed capacitances and resistances were used to calculate the membrane resistances (R_M). capacitance (C_M), reactance (X_X), and also derive the impedance (Z). At higher frequencies, the capacitances became low and the impedance decreased with increasing frequency with a corresponding increase in the measured phase angle. On the other hand at the highest frequencies attainable, the phase angle became low. At low frequencies, the phase angle was become independent of the cation, while the impedance showed a clear dependence. The diffused double-layer polarization charge on the geometric capacitor played important role by affecting the overall membrane capacitance. The applied frequencies affected the double-layer capacitance due to the movement of ions across the membrane. At the membrane-electrolyte interface, the electrical double-layer was influenced in addition to being controlled by the transport of ions.
机译：在我们先前对复合聚苯乙烯-砷酸钴（PS-Co-As）进行的研究的基础上，我们进一步扩展了阻抗测量范围。报告的所有计算均取自在等温温度（25±0.1°C）下在1 -5 kHz频率范围内以及不同浓度（0.0001≤c（M）≤1）的KCl和NaCl进行的实验。观察到膜电容和电阻的测量取决于电解质的浓度和施加的频率。观察到的电容和电阻用于计算膜电阻（R_M）。电容（C_M），电抗（X_X）以及阻抗（Z）。在较高的频率下，电容变小，并且阻抗随频率的增加而减小，并且相角也相应增加。另一方面，在可获得的最高频率下，相角变小。在低频下，相角变得与阳离子无关，而阻抗却表现出明显的依赖性。几何电容器上扩散的双层极化电荷通过影响整体膜电容发挥了重要作用。由于离子跨膜的运动，施加的频率影响了双层电容。在膜-电解质界面处，双电层除了受到离子传输的控制外，还受到影响。

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