Undistorted cyclic voltammograms at scan rates up to 2.5 MV.s−1 through positive feedback compensation of Ohmic drop

Abstract

AbstractA circuit based on the current feedback operational amplifier was constructed to accomplish on‐line ohmic drop compensation in ultrafast cyclic voltammetry. Firstly, its characteristics were confirmed experimentally on dummy cells. Then the reduction of anthracene in acetonitrile, a classical test example with very fast electron‐transfer kinetics, was examined to prove them too. The results showed that this circuit could afford excellent ohmic drop compensation so that the undistorted voltammograms up to 2.2 MV*s−1 scan rate can be recorded, and 2.5 MV*s−1 if 5% error is tolerated.