Rotating disk electrode polarization curves

Cu9ln4 and Cu2Se. They performed electrodeposition potentiostatically at room temperature on Ti or Ni rotating disk electrodes from acidic, citrate-buffered solutions. It was shown that the formation of crystalline definite compounds is correlated with a slow surface process, which induced a plateau on the polarization curves. The use of citrate ions was found to shift the copper deposition potential in the negative direction, lower the plateau current, and slow down the interfacial reactions. 

Figure 8.9 Polarization curves for a PtSn/C catalyst recorded by a rotating disk electrode in 0.5 M H2SO4 saturated with either pure hydrogen, a H2/2% CO mixture, and pure CO (the arrow points to the onset of CO oxidation) at 60 °C with 1 mV/s and 2500 rev/min the dashed curve is the cyclic voltammogram (in arbitrary units) in an argon-purged solution at 60 °C with 50 mV/s. (Reprinted with permission from Aienz etal. [2005]. Copyright 2005. Elsevier.)...

Figure 9.13 Polarization curves for ORR on Pt monolayers supported on Ru(OOOl), Ir(lll), Rh(lll), Au(lll), and Pd(lll) in a 0.1 M HCIO4 solution on a disk electrode. The curve for Pt(lll) was obtained from [Markovic etal., 1999] and is included for comparison. The rotation rate was 1600rev/min and the sweep rate was 20mV/s (50mV/s for Pt(lll)). Key 1, PtMi,/ Ru(OOOl) 2, PtML/fr(lll) 3, PtML/Rh(lH) 4, PtML/Au(lll) 5, Pt(lll) 6, PtML/Pd(lH). (Reproduced with permission from Zhang et al. [2005a].)...

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. 

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. 

Fig. 15.3 Polarization curves obtained using a rotating disk electrode for O2 reduction on different carbon dispersed metal nanoparticles in a 0.1 M NaOH solution. Rotation rate...

Figure 23. Polarization curves for O2 reduction and generation on a palladium rotating disk electrode at 6100 Also shown is the potential dependence of the surface coverage do...

Figure 4.4.12. Steady state polarization curves for iron in NaS04-H2S04 solutions according to Keddam et al. [1981] (a) Simulated curves, b) Experimental data. Rotating disk electrode (rotating speed = 1600rpm, diameter = 3 mm), T = 25 0.2°C. (From M. Keddam, O. R. Mattos, and H. J. Takenouti, Reaction Model for Iron Dissolution Studied by Electrode Impedance Determination of the Reaction Model, J. Electrochem. Soc., 128, 257-274, [1981]. Reprinted by permission of the publisher. The Electrochemical Society, Inc.)...

Figure 4.38 Polarization curves for Fe in aerated 0.5M NaCl measured with a rotating disk electrode at 20 °C by applying different rotation rates [14]. The dashed lines show the anodic and cathodic partial current densities.

Figure 4.44 Anodic polarization curves for iron in 3M FeCl2 solution at different rotation rates of a rotating disk electrode [19].

Figure 6.15 Anodic polarization curves of an Fe rotating disk electrode in 1 M H2SO4 at different rotation rate (rad s ) [10].

Figure 6.37 Anodic polarization curves for an iron-chromium alloy (Fe-13Cr) in an electrolyte consisting of 65% H3PO4, 20% H2SO4 at 70 °C, measured on a rotating disk electrode at different rotation rates 100, 400, 1600, 3600,4800 rpm [35].

The reaction rates of electrocatalytic reactions often are measured by polarization curves using the rotating disk electrode (RDE) method. As Fig. 2 shows, the HER and HOR currents (blue lines) on Pt, respectively, rise sharply with... 

Figure 13.7. Polarization curves for O2 reduction reaction on Au/Pt/C (A) and Pt/C (C) catalysts on a rotating disk electrode, before and after 30,000 potential cycles. Sweep rate 10 mV/s rotation rate 1600 rpm. Voltammetric curves for Au/Pt/C (B) and Pt/C (D) catalysts before and after 30,000 cycles sweep rates 50 and 20 mV/s, respectively. The potential cycles were from 0.6 to 1.1 V in an 02-saturated 0.1 M HCIO4 solution at room temperature. For aU electrodes, the Pt loading was 1.95 mg (or 10 nmol) on a 0.164 cm glassy carbon rotating disk electrode. The shaded area in (D) indicates the lost Pt surface area [31]. (From Zhang J, Sasaki K, Sutter E, Adzic RR. Stabilization of platinum oxygen-reduction electrocatalysts using gold clusters. Science 2007 315 220-2. Reprinted with permission from AAAS.)...

Figure 21.6. Polarization curves at various rotation rates for oxygen reduction at a HT-FeTPP/CoTPP-coated rotating disk electrode in 02-saturated 0.5 M H2SO4 solution [44]. (Reprinted from Electrochimica Acta, 45(24), Jiang R, Chu D, Multiple small potential steps at a rotating disk electrode and applications, 4025-30, 2000, with permission from...

Yen SC, Chapman TW (1985) Computing polarization curves for the rotating disk electrode by orthogonal collocation. Chem Eng Commun 38 159-180... 

Figure 21. Steady-state polarization curve for a Johnson Matthey iron rotating disk electrode (jx)tentiokinetic sweep rate = 80 mV min" rotation speed = 1600 rpm) in 0.05M SO4 solutions of different pH values (indicated on the curves). The equilibrium potential lines for the thermodynamically possible reactions are superimposed. (From Ref. 33.)...

Figure 23. Cyclic polarization curves recorded near the corrosion potential under potentiostatic conditions for a polycrystalline (A) and a single-crystal Johnson Matthey iron rotating disk electrode (B) in 0.5M H2SO4 solution (pH 0.3), displaying hysteresis only for the single-crystal electrode. (From Ref. 33.)...

Linear sweep voltammetry (LSV) in combination with a rotating disk electrode (RDE) is a widely used technique to study electrode kinetics. Different methods exist to extract the values of the process parameters from polarization curves. The Koutecky-Levich graphical method is frequently used to determine the mass transfer parameters (Diard et al., 1996) the slope of a plot of the inverse of the limiting current versus the inverse of the square root of the rotation speed of the rotating disk electrode is proportional to the diffusion coefficient. If more than one diffusing species is present, this method provides the mean diffusion coefficient of all species. The charge transfer current density is determined from the inverse of the intercept. In practical situations, however, the experimental observation of a limiting current... 

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