Rotating disk-ring technique

The most appropriate experimental arrangement for the quantitative determination of the stationary curves for the reaction is the rotating disk electrode technique, in which the convective transport is controlled mechanically and thus a constant diffusion layer for each species is achieved [101-106]. Modifications of this technique, to primarily collect the intermediates of the reactions, such as ring-disk electrode techniques [93,94] and a hanging meniscus rotating disk electrode... 

Although a major advantage of rotating disk electrode techniques, compared to stationary electrode methods, is the ability to make measurements at steady state without the need to consider the time of electrolysis, the observation of current transients at the disk or ring following a potential step can sometimes be of use in understanding an electrochemical system. For example the adsorption of a component. 

Figure 27. Polarization curves for O2 reduction in 0.1 A/KOH on carbon with and without cobaltic oxides using the rotating disk-ring electrode technique. Curve 1, carbon black 2, carbon black + C0C02O4 3, carbon black + MnCo204 4, carbon black + NiCo204. Curves 1 to 4 corresponding currents for H02 oxidation on a Pt ring. Rotation rate 655 rpm.

Electrochemiluminescence quantum yields of 8—10% from 9,10-diphenylanthracene and 14—20% from the 9,10-diphenylanthracene anion—thianthrene cation combination have been reported using the rotating ring disk electrode technique (157,173). 

Using underpotential deposition with the redox replacement technique a novel electrochemical approach for nanoparticle-based catalyst has been designed. Here, the as-prepared Pt-coated Au nanoparticle monolayer at atomic level on the electrode surface can reduce O2 predominately by 4e to H2O, which was confirmed by rotating ring disk electrode technique (Figure 8). 

Theory of Rotating Ring-Disk Electrode Technique 200... 

V.Y. Filinovskii and Y.V. Pleskov, Rotating disk and Ring-Disk electrodes. In E. Yeager, J.O M. Bockris, B.E. Conway, and S. Sarangapani (eds). Comprehensive Treatise of Electrochemistry, Vol. 9, Electrodics Experimental Techniques, Plenum Press, New York (1984), Chapter 5, p. 293. 

The oxygen reduction mechanism of the electrocatalyst is usually examined by the rotating ring-disk electrode technique as shown in Fig. 2. Cathodic electrochemical oxygen reduction occurs on the disk electrode attached with electrocatalyst in the alkaline aqueous electrolyte containing dissolved oxygen. While, the... 

The most frequently used techniques for ORR catalysis studies are steady-state polarization, cyclic voltammetry, rotating disk electrode (RDE), and rotating ring-disk electrode (RRDE). 

---