Abstract
A new analytical method which combines an eletrochemical quartz crystal microbalance (EQCM) and a wall jet electrode has been developed. By using a split-ring electrode, in-situ detection of two kinds of ions emitted from the working electrode can be performed during an eletrochemical measurement. In the present measurement, Cu(I) and Cu(II) dissolved from copper electrodes were determined on two half-ring electrodes, respectively; moreover, the resonant frequency change was measured simultaneously. Using the present method, the electrode reaction can be analyzed by four parameters: the working electrode current, the dissolution rates of two kinds of ions, and the electrode mass change. The amount of charge for the species accumulated on dissolving copper electrode was obtained by subtracting the dissolving components form the working electrode current. By comparing the amount of dissolved ions with the total mass change calculated from the resonant frequency change, the mass change regarding the accumulated species could be estimated.
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