Abstract: A novel electrochemically interfacial potential sensor was developed. The setup of the sensor was to connect a conducting material between two clips of working and count electrodes of a three-electrode potentiostat to be Ohmic circuit. Experimental procedure included immersing the conducting material in aqueous solution containing some species of interest, applying a linear sweep potential(with respect of reference electrode) to the conducting material and recording the I-E curve. Owing to the distribution, adsorption, reaction and others of the species at the conducting material-solution interface, interfacial potential changed and offseted applied potential partially, resulted in the shift of the recorded I-E curve along potential axis. The shift of the I-E curve was marked with so-called zero current potential where circuit current is zero in the I-E curve. With the dependence of zero current potential on interfacial potential in various interfacial conditions, the sensor has wide application field not only in the study of interfacial phenomena but also in the analytical determination.

Key words: Interfacial potential, Sensor, Zero current potential