Electrical cross-talk in transient mode of scanning electrochemical microscopy

The theoretical and experimental investigations of the electrical cross-talk in a four-electrode configuration without faradaic interference were performed. It was shown that the common resistance shared by the two working electrodes plays a major role in the electrical response of the system. In the particular case of the scanning electrochemical microscopy, the transient response of the probe to a potential step applied to the substrate results in two-time constants and the cell-time constant of the substrate governs the attainable time constant of the whole system.

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► The electrical cross-talk in a four-electrode electrochemical experiment was investigated.
► Two time constants are observed on the passive electrode.
► A common electrolyte resistance accounts for this electrical cross-talk.