Mirtaheri Peyman, Grimnes Sverre, Martinsen Orjan G
Interventional Center and Department of Clinical and Biomedical Engineering, Rikshospitalet University Hospital, Oslo 0027, Norway.
IEEE Trans Biomed Eng. 2005 Dec;52(12):2093-9. doi: 10.1109/TBME.2005.857639.
In this paper, we characterize the polarization impedance behavior of several common metals in diluted NaCl solution operated at low current densities. The objective was to provide a useful reference for those wishing to calculate the electrode polarization impedance in diluted NaCl solutions. Serial equivalent resistance (R) and capacitance (C) for silver, aluminum, gold, platinum, and medical stainless-steel were measured as a function of frequency (10(-2)-10(3) Hz) and NaCl concentration (2.4-77.0 mmol/L). The ratio of electrode polarization impedance with respect to the bulk resistance was calculated and plotted against concentration for each metal. Such a ratio shows the effect of the electrode polarization contribution as a function of electrolyte concentration when the bulk resistance of the solution changes. All metals showed a decrease of serial resistance Rp and capacitance Cp as a function of frequency. The medical stainless-steel electrode showed largest impedance values at lower frequencies compared to the other electrodes, and was concentration independent at all frequencies. Aluminum had smallest polarization impedance at low frequencies. Pure gold and platinum behaved similar with the exception that the serial resistance for gold showed a lower value at higher frequencies.
在本文中，我们表征了几种常见金属在低电流密度下于稀释氯化钠溶液中的极化阻抗行为。目的是为那些希望计算稀释氯化钠溶液中电极极化阻抗的人提供有用的参考。测量了银、铝、金、铂和医用不锈钢的串联等效电阻（R）和电容（C）随频率（10⁻² - 10³ Hz）和氯化钠浓度（2.4 - 77.0 mmol/L）的变化。计算了每种金属的电极极化阻抗与体电阻的比值，并将其作为浓度的函数进行绘制。当溶液的体电阻变化时，这样的比值显示了电极极化贡献随电解质浓度的函数关系。所有金属的串联电阻Rp和电容Cp均随频率降低。与其他电极相比，医用不锈钢电极在较低频率下显示出最大的阻抗值，并且在所有频率下均与浓度无关。铝在低频下具有最小的极化阻抗。纯金和铂的行为相似，只是金的串联电阻在较高频率下显示出较低的值。
