Rotating disk electrode with a ring

The electron affinity of 3-(iV-methylpiperazino)-5-nitroindazole, 3,5-dinitroindazole, and molecular complex of the last with water is discussed on the basis of their half-wave potentials and in connection with their eventual radiosensitizing properties [667], The mechanism of EC behavior of 2-substituted 5(6)-nitrobenzimidazoles in acetonitrile has been investigated by classical polarography, cyclic voltammetry, and platinum rotating disk electrode with a ring (RDER) [888,991], It is shown that... 

RDER Rotating disk electrode with a ring... 

Other Unusual Electrode Shapes. Various modifications of the rotating disk electrode are described in the literature. For example, the rotating disk electrode with ring sometimes suffers from bubbles that collect in the cotter and make it difficult to determine the fraction of the disk available for electrode reactions. One remedy is to use a cone-shaped electrode the ring is on the side of the cote and the disk at the tip. Bubbles don t like tips and skelter. 

Figure 3.39 (A) Rotating-disk electrode with hydrodynamic flow pattern. (B) Bottom view of rotating-disk electrode (RDE) and rotating ring-disk electrode (RRDE).

One of informative methods of an directions of the mechanism of oxygen electroreduction is the method of a disk rotating electrode with a ring. 

The experimental setup of a rotating hemispherical electrode (RHSE) is similar to that of a rotating disk electrode [50]. The basic system consists of a removable hemispherical electrode, and a variable speed rotator equipped with a provision, such as the slip-ring contact, to make electric connection to the hemispherical electrode during the experiments. 

Are Rotating Disk with Ring Electrodes Still Useful in the Twenty-first Century When the rotating disk electrode was first used, it was the 1960s since that time, many new methods for measuring electrode reactions (above all, spectroscopic ones, e.g., those in Section 7.5.15), have been invented. Furthermore, microelectrodes have made it possible, in effect, to reduce 5 by as much as 1000 times compared with that in a still solution, so that one of the uses of the rotating disk... 

Figure 3.12 Construction of rotated-disk and ring-disk electrodes (a) hydrodynamic disk electrode for high rotation speeds (b) side and bottom views of a ring-disk electrode with wells for carbon paste or press-fit noble metals.

In order to determine the kinetic parameters of the reaction corrected from diffusion phenomenon, a voltammetric investigation was pursued with a rotating platinum ring disk electrode. Figure 21.10 represents current density-potential curves obtained for different rotation speeds and for the positive variations of potential. It appears that the current density of the rotating disk increases with the rotation rate. 

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