A new method for optimising polarisation point in electrochemical impedance based measurements

In this work, we show a new procedure to obtain an optimum DC polarisation potential that allows achieving the maximum possible sensitivity for analyte determination, when electrochemical techniques are used. This is valid whether purely DC or AC potentials are used for system polarisation. In addition, the optimum potential is lower than the ones generally used by the classical methods, avoiding redox-active interferents and rapid degradation of the working electrode. In our case, we obtain a reduction of 16% of the DC applied potential and an increase among 3 and 5 times in the sensitivity.

Automated summary

In this work, we present a new method to achieve the optimum DC polarisation potential, resulting in maximum sensitivity for analyte determination using electrochemical techniques. This method is applicable to both DC and AC potentials for system polarisation. Additionally, the optimum potential is lower than the potentials typically used by classical methods, leading to reduced interference and degradation of the working electrode. In our case, we observed a 16% reduction in applied DC potential and a 3 to 5 times increase in sensitivity.