Anodic sweep curve

Figure 11. Schematic diagram of anodic polarization curve of passive-metal electrode when sweeping electrode potential in the noble direction. The dotted line indicates the polarization curve in the absence of Cl-ions, whereas the solid line is the polarization curve in the presence of Cl ions.7 Ep, passivation potential Eb, breakdown potential Epit> the critical pitting potential ETP, transpassive potential. (From N. Sato, J, Electrochem. Soc. 129, 255, 1982, Fig. 1. Reproduced by permission of The Electrochemical Society, Inc.)...

Potentiodynamic Technique. Adsorption of methanol on Pt in acid solution was studied by Breiter and Gilman (3) using a potentiostatic technique. The anodic sweep, with a sweep rate of 800 V/s, was started at rest potential and extended to 2.0 V with respect to a hydrogen reference electrode in the same solution. As shown in Figure 10.8, the current was recorded as a function of potential (time) in the absence (curve A) and in the presence (curve B) of methanol. The increase in current in curve B is due to oxidation of the adsorbed methanol on the platinum electrode. Thus, shaded area 2 minus shaded area 1 (Fig. 10.8) yields the change 2m (C/cm ) required for oxidation of the adsorbed methanol ... 

Figure 10.9. Anodic charging curves from 0.4 V during the galvanostatic transients anodic potential sweep at 91 mA/cm in 1N HCIO4 (curve a) and in 1N HCIO4 + HCOOH (curve b). (From Ref. 3, with permission from the Electrochemical Society.)...

Fig. 6.17. Cyclic voltammograms of o-phenylenediamine (101 M) oxidation for W03 thermal-treated (350°C) anodic films (b) and smooth platinum electrode (c) first sweep (curves 1) and repeated sweep (curves 2) scan rate was 80 mV/cm2. The left picture shows a schematic representation of the morphology of thermal-treated anodic W03 film tungsten support, highly defective oxide (including the continuous donor clusters), moderately doped oxide (non-shaded region), poly-o-phenylenediamine deposits.

Analyzing the data of Table 6 reveals that the results obtained by different authors in sodium salt solutions, at first sight, do not qualitatively agree with each other. Thus, in Refs. and only one oxidation peak (of solvated electrons or their associates) was observed on cyclic voltammetric curves during anodic sweep of potential. The slow potentiodynamic curves obtained initially by Kanzaki and Aoyagui have also one peak. In the much later works of these authors and... 

The cyclic voltammogram curves of formaldehyde oxidation are presented in Fig. 1. In the anodic sweep of curve (a), the well-defined anodic peak at approximately +0.78 V (vs. SCE) is attributable to the oxidation of CO to CO2 on the Pt surface [3]. In the reverse sweep, an anodic peak was observed at approximately +0.51 V (vs. SCE) due to the complete oxidation of HCHO to... 

Fig. 1.16 (a) Polarization curves for CO oxidation for Pt(lll) in CO-saturated 0.1 M HCIO4 solution measured at temperatures of 280 K (dotted line). 299 K (black line) and 319 K (grey line) (sweep rate 2 mV s ). Only the anodic sweeps are shown, (b) The corresponding XRVs measured at (34.34. 

Potentiodynamic and potentiostatic anodic polarization curves obtained at the same sweep rate are identical. They identify corrosion properties of passivating metals and alloys and are very useful in predicting the corrosion properties of materials. Figure 4.5 shows potentiostatic polarization curve of an active-passive metal with more than one passivation potential. 

Fig. 15.10 (a) CV curves in Ar-purged 0.1 M KOH on Ag (hkl) sifffaces. All CVs were obtained at room temperatine with a sweep rate of 50 mV s . (b) FractiOTial charge per atom, obtained by integrating the anodic sweep direction of CV (fiorn a) after accounting for the different surface atom density of different Ag(hkl) orientations, (c) Fractional charge per atom expressed rm the rational potential scale (RPS) [47]... 

In the voltammetry curves the anodic sweep is quite different from the cathodic. The latter consists of a single almost symmetrical peak suggesting a single desorption mechanism. The kind of irreversibility exhibited by the anodic layer on Pt is referred to by Conway et as intrinsic or... 

Current-potential curves have been determined only by the cyclic voltametric method using a sweep rate of 40 mV/sec (cf. Figure 15). ° In the anodic sweep, practically no current flows from 0.4 to 0.9 V. At 0.91 V a vertical rise of the current is observed, and from 0.91 V to 1.6 V the current decreases linearly with potential. The current observed at 0.91 V was dependent on stirring rate... 

Figure 6.5 Anodic polarization curve of Fe-66Ni-16Mo in 50% H2SO4 in absence (a) and in presence (b) of 42g Fe2(S04)3 Sweep rate is 0.33 mV/s, 7 = 125 °C [2],...

Figure 1.29 Anodic polarization curves of copper, gold and two Cu-Au alloys in 12 M LiCl, 25 °C. Sweep rate is 0.1 mV s [8].

Figure 1 Anodic polarization curves of the pure metals Fe, Cr, Mo, and Ni and of an austenitic stainless steel, Fel8Crl4.3Ni2.5Mo (at %) (Fel6.7Crl5.0Ni4.28Mo wt%) exposed to 0.1 M HCl + 0.4 M NaCl at 25°C. Sweep rate, 3 mV/s. (From Ref 1.)...

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