THE STEADY-STATE AT A PAIR OF HEMISPHERICAL MICROELECTRODES

The distribution of electroactive species in the vicinity of twin pola rized hemispherical microelectrodes has been derived, for any value of rho, the ratio of the interelectrode spacing to the electrode diamete r. Thereby, it is demonstrated that the steady-state limiting current exceeds that at a single hemispherical microelectrode by the factor 4 rho/(2 rho + 1) + exp(- 2.9 rho). The same limiting current is also pa ssed by a spherical electrode suspended above a nearby plane. Merged h emispherical electrodes and sphere-cap electrodes are also discussed.