Oxygen rotating disk electrode

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.)...

Higuchi E, Uchida H, Watanahe M. 2005. Effect of loading level in platinum-dispersed carbon black electrocatalysts on oxygen reduction activity evaluated by rotating disk electrode. J Electroanal Chem 583 69-76. 

Thin catalyst layers on a GC rotating disk electrode (RDE) or a rotating ring-disk electrode (RRDE) serve for studies of ORR kinetics. In order to separate the kinetic current from the measured current j, Schmidt and co-workers [Schmidt et al., 1998b] corrected the latter for the influence of oxygen diffusion in the aqueous electrolyte and in the polymer film using the foUowing equation ... 

Figure 16.7 Specific activity for oxygen reduction at 0.3 V vs. RHE on carbon- and titania-supported Au nanoparticles [Guerin et al., 2006b] (a) C/Au (b) TiO /Au. In the case of TiO c/Au (b), results are shown for data obtained on arrays of electrodes (O) and on rotating disk electrodes (RDE) (A).

Eligh performance liquid chromatography Density functional theory Oxygen reduction reaction Rotating disk electrode Rotating ring disk electrode... 

Adsorbed Mn6g and Mn6i were employed for the detection of oxygen [94], Rotating disk electrode voltammetry revealed two electron reduction in acidic and slightly... 

Figure 7 (a) Cathodic polarization data for a low carbon steel rotating disk electrode in 0.6 M NaCl with ambient aeration. Oxygen reduction limiting current densities are shown for the indicated rotation rates, (b) Plot of experimental limiting current density versus square root of the rotation rate, showing the experimental and predicted linear behavior. 

The objective of the mass transport lab is to explore the effect of controlled hydrodynamics on the rate at which a mass transport controlled electrochemical reaction occurs on a steel electrode in aqueous sodium chloride solution. The experimental results will be compared to those predicted from the Levich equation. The system chosen for this experiment is the cathodic reduction of oxygen at a steel electrode in neutral 0.6 M NaCl solution. The diffusion-limited cathodic current density will be calculated at various rotating disk electrode rotation rates and compared to the cathodic polarization curve generated at the same rotation rate. 

O Grady et al. [227] studied the reduction and evolution of oxygen on RuO on titanium and reported that the cathodic reaction involves the formation of peroxide in solution. From y 1/2 vs. rotating disk electrodes, the authors concluded that the reaction 02/H202 was in equilibrium at the surface [227], Miles et al. [428] also studied the oxygen electrode reactions on several metal oxides (Ir, Ru, Pd, and Rd)... 

If a reaction path is predominant and one of its elementary step is rate determining, the Tafel slope will be characteristic of this step. Thus, electrochemical measurements performed on rotating disk electrode can provide a first solution to elucidate the mechanistic behavior of oxygen reduction reaction on a catalyst. Par-sons has demonstrated that, in a several step electrode process,... 

Figure 3 Plots of the total number of electrons Ut (a), of the Tafel slope b (b), of the limiting current density IjA,-, (c) and of the exchange current density I/A (d), versus the platinum loading for the reduction of oxygen on a platinum-modified polyaniline-glassy carbon rotating disk electrode (O2 saturated 0.5 M H2SO4 2mVs 25 °C A, is the true surface...

Methanol oxidation on CNF- and CNT-supported Pt-Ru particles in liquid electrolytes has been studied using cyclic voltammetry, chronoamperometry [13,231-237], and electrochemical impedance spectroscopy [236]. Rotating disk electrode and linear potential sweep voltammetry in liquid electrolytes were used to study the oxygen reduction reaction on Pt supported on CNTs and CNFs (see,... 

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

C) (110) orientations. (D) Polarization curves obtained from rotational disk electrode (RDE) measurements in 0.1 M HCIO4 at 333 Kat 1600 rpm with 50 mV s PtsNidll) (bold), Pt(111) (long dashed), and Pt-poly (dashed). Reprinted from Science, 315, 493 (2007), Vojislav R. Stamenkovic., Improved oxygen reduction activity on PtsNillll) via increased surface site availability, 493-497, 2007, with permission from Sciencemag. 

For a research on the electrode reaction mechanism and kinetics, particularly those of oxygen reduction reaction (ORR) (O2 + 4H+ + 4e -> 2H2O in acidic solution, or 02 + 2H20 + 4e -> 40H in alkaline solution), it is necessary to design some tools that could control and determine the reactant transportation near the electrode surface and its effect on the electron-transfer kinetics. A popular method, called the rotating disk electrode (RDE) technique has heen widely used for this purpose, particularly for the ORR. 

In Chapter 5, we presented rotating disk electrode (RDE) technique in terms of both fundamentals and applications in catalyst evaluation for oxygen reduction reaction (ORR) kinetics. 

Fig. 16.5 Oxygen electroreduction on 3 and 7 nm Au nanoclusters in oxygen-saturated 0.5 M KOH. Cyclic voltaminograins (sweep rate 10 mV s ) of Au nanoparticles rai carbon rotating disk electrodes at several rotation speeds (a) 3 and (b) 7 nm clustas. Levich plots of the voltammogram data (the currents at —0.6 V were used) (c) 3 and (d) 7 nm clusters (extracted from [33])...

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