The ac impedance of spherical, cylindrical, disk, and ring microelectrodes

Abstract The ac impedance for a simple redox reaction at microspherical and cylindrical electrodes is derived using conventional methods. An exact formalism is developed for the analysis of the behavior of microdisks and microrings which will allow the analysis of complex reactions using such electrode designs. The analysis here is restricted to the approximation of a uniform ac flux to the electrodes. The behavior of the various electrode designs is compared and contrasted with that of the conventional large planar systems.