The Effect of Very High Magnetic Fields on Cyclic Voltammetry

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Abstract
The cyclic voltammetry of ferrocene and p-benzoquinone in N,N-dimethylformamide and acetonitrile was inverstigated under very high magnetic fields up to 140 kOe (1 kOe=(1⁄4π)×103 A m−1). Plateaus of limiting currents were observed on cyclic voltammograms, and the limiting currents were remarkably enhanced by magnetic fields. These results were explained as the enhancement of mass transfer, which is caused by a magnetohydrodynamic convection. This effect was found to be pronounced at the slow potential scan rate of 10 mV s−1 in a low viscosity solvent like acetonitrile, where the current is controlled by not only mass transfer but also the electron transfer rate. The current enhancement was also observed in anodic stripping on the cyclic voltammogram of Cu2+ above 100 kOe.