Rotating disk electrode catalytic reaction

In such systems the researcher can electrochemically clean and precondition the metal electrode before each run to provide an identical surface for the anodic and the cathodic half-reactions as well as for the catalytic reaction between them. Use of a rotating disk electrode/ckatalyst also allows surface- and diffusion-controlled processes to be easily distin-guished. ... 

Figure 8.12 Relationships between the catalytic properties and electronic structure of Pt3M alloys correlation between the specific activity for the oxygen reduction reaction measured experimentally by a rotating disk electrode on Pt3M surfaces in 0.1 M HCIO4 at 333 K and 1600 lev/min versus the li-band center position for (a) Pt-skin and (b) Pt-skeleton surfaces. (Reprinted with permission from Stamenkovic et al. [2007b]. Copyright 2007. Nature Pubhshing Group.)...

Although cyclic voltammetry could fruitfully be applied to the kinetic analysis of these catalytic systems, it has mostly been investigated by means of rotating disk electrode voltammetry (Section 1.3.2). The simplest case is that of an irreversible catalytic reaction at a monolayer coating. The next section is devoted to the analysis of these systems by the two techniques. 

C03M03N was, however, used as a precursor to C0M0N2 via reaction with NH3 at 400 °C. The actual formula reported was C006M02 4N2 with a small Co(M) component. Rotating disk electrode measurements in acidic media under H2 atmosphere demonstrated that currents for the HER reaction were achieved at overpotentials of around 0.2 V, which indicates promising catalytic activity in the C02M0N sample. 

Table 3.1. Catalytic Activities of Some Typical Electrocatalysts for Oxygen Reduction Reaction, Measured Using Rotating Disk Electrode Technique...

Nolan JE, Plambeck JA (1990) The EC-catalytic mechanism at the rotating disk electrode. Part II. Comparison of approximate theories for the second-order case and application to the reaction of bipyridinium cation radicals with dioxygen in non-aqueous solutions. J Electroanal Chem 294 1-20... 

A typical set of rotating disk voltammograms for the mediated reduction of [Fe(H20)6] in 0.1 M H2SO4 is shown in Fig. 8.24. These plots show that the mediating process occurs in the potential region of the Os(III/II) redox couple. Koutechy—Levich plots obtained from such curves are shown in Fig. 8.25 as a function of the layer surface coverage. These Koutechy—Levich plots are linear, and the catalytic reaction increases with increasing film thickness. Furthermore slopes obtained are the same as the one obtained at the bare electrode. Since the intercepts of these plots are equal to electrochemical rate constant clearly depends... 

Appleby, A. and Savy, M. (1978). Kinetics of Oxygen Reduction Reactions Involving Catalytic Decomposition of Hydrogen Peroxide Application to Porous and Rotating Ring-disk Electrodes, J. Electroanal. Chem., 92, pp. 15-30. 

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