Compensation of Ohmic Potential Interactions Occurring at Ring-Disk Electrodes

Pseudocollection and inverse pseudocollection effects caused by potential drops at ring-disk electrodes can be eliminated by positive feedback. A potential proportional to a fraction of the disk electrode current is fed back to the ring electrode potentiostat, eliminating changes in ring potential and current that arise due to the variations of the disk electrode potential and current. Analogously, feedback of a potential proportional to a fraction of the ring current to the disk electrode potentiostat prevents variations of disk electrode potential and current that are due to the variations in ring electrode potential and current. The two positive feedback networks function independently and no a priori knowledge of the uncompensated resistance is required.