Dispersion of Impedances at Solid Electrodes

Dispersion of Impedances at Solid Electrodes
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固体电极的阻抗分散

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发表时间:
2014
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通讯作者:
A. Lasia
A. Lasia
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作者:
A. Lasia

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液体在理想可极化电极处的阻抗(例如,汞、汞齐、铟镓)可以用R-C电路来模拟(图4.1a)。然而,现在大多数阻抗研究都是在固体电极上进行的。在这些电极处,双层电容不是纯电容性的,并且通常显示出一定的频率分散。这种行为不能用由R、L和C元件组成的简单电路来模拟。为了解释这种行为,通常使用恒定相位元件(CPE)。
The impedance of liquid at ideally polarizable electrodes (e.g., mercury, amalgams, indium-gallium) may be modeled by an R-C circuit (Fig. 4.1a). However, most impedance studies are now carried out at solid electrodes. At these electrodes the double-layer capacitance is not purely capacitive and often displays a certain frequency dispersion. Such behavior cannot be modeled by a simple circuit consisting of R, L, and C elements. To explain such behavior, a constant phase element (CPE) is usually used.