SINE-WAVE POTENTIAL METHOD USED FOR MEASURING ELECTRODE/SOLUTION INTERFACIAL CAPACITANCE

J Chin Soc Corr Pro

1992, Vol. 12

Issue (1): 71-76 DOI:

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SINE-WAVE POTENTIAL METHOD USED FOR MEASURING ELECTRODE/SOLUTION INTERFACIAL CAPACITANCE

Tan Mingwei; Xu Min; and Wang Kuang 1 (Shanghai university of Science and TechnoLogy) 2 (Shanghai Xinhua Bearing Factory) 3 (Shenzhen Dapeng Anticorrosion Engineering and Trade Company)

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Abstract A new method of measuring electrode/electrolyte interfacial capacitance has been introduced. By making use of the Laplace transformation and convolution theorem, it can be deduced from simple equivalent circuit of electrode/solution interface that there is a linear dependence of the product of peak response current(ira)flowing through the electrode, which is polarized by sine-wave voltage with various angular frequence but the same range,and angular frequence(ω)on the square of angular frequence: im·ω=A·Cd·ω~2+B The interfacial capacitance (Cd)of electrode/solution can be calculated from the derived linear equation. The effects of solution resistance and charge transfer resistance on the suitability of solution resistance and charge transfer resistance on the suitability of the method have also been discussed. The method has proven experimentally superior to those available in textbooks and literatures, and it is shown that the method is applicable to most actual electrochemical systems in spite of its inability for application to ideally nonpolarizable electrode.

Received: 25 February 1992

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Tan Mingwei; Xu Min; and Wang Kuang 1 (Shanghai university of Science and TechnoLogy) 2 (Shanghai Xinhua Bearing Factory) 3 (Shenzhen Dapeng Anticorrosion Engineering and Trade Company). SINE-WAVE POTENTIAL METHOD USED FOR MEASURING ELECTRODE/SOLUTION INTERFACIAL CAPACITANCE. J Chin Soc Corr Pro, 1992, 12(1): 71-76.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I1/71

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