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. Graphical abstract