Linear anodic potential sweep

Linear anodic potential sweep, 30 256-257 Linear correlations, structure effects, 29 160-161... 

Fig. 14. Response of smooth platinum anodes during linear anodic potential sweep for ethane adsorption at 0.3 V in 1 Al liOO (174. The anodic and cathodic pretreatment schedule of the electrode is shown at the bottom of the figure. The sweep follows ethane adsorption for time Te, corresponding to the various curves.

There is additionally the important problem involved in choosing the reduction or oxidahon potential of the electrolyte solutions from either cyclic voltammetry (CV) or linear sweep voltammetry (LSV). Since the oxidation or reduction reachon of cations or anions contained in the RTILs are electrochemically irreversible in general [8-10], the corresponding reduction or oxidation potential cannot be specifically obtained, unlike the case of the redox potential for an electrochemically reversible system. Figure 4.1 shows the typically observed voltammogram (LSV) for RTILs. Note that both the reduchon and oxidation current monotonically increase with the potential sweep in the cathodic and anodic directions, respectively. Since no peak is observed even at a high current density (10 mA cm ), a certain... 

Variations in cathodic peak current with the square of the sweep rate [/p,.. = /(v -)] for. selected PACE/electrolyte systems are shown in Figs. 13a and 13b [194]. In all ca.ses the relation is linear and the correlation coefficient tends to unity, especially in the lower ranges of the potential sweep rates. In agreement with numerous researchers [7,9,14,16,24,26,132], we also suggest that the cathodic peak is due to the reduction of quinonelike groups, whereas the anodic wave is due to the oxidation of hydroquinonelike groups in different environments on the active carbon surface of the electrode. These reactions are faradic... 

Fig. 13 Linear potential sweep results of Zhu and Sadoway showing a large drop in current at an anode as the potential reaches a few volts (versus AI/AIF3) during the forward sweep and the persistence of the low current as the potential is subsequently swept downward. Note the dependence on alumina concentration [31],...

The technique of controlled-potential cathodic deposition followed by anodic stripping with a linear potential sweep has been applied to the determinations of a number of metals (e.g., Bi, Cd, Cu, In, Pb, and Zn) either alone or in mixtures (Figure 11.8.5). An increase in sensitivity can be obtained by using pulse polarographic, square wave, or coulostatic stripping techniques. Other variants, such as stripping by a potential step, current step, or more elaborate programs (e.g., an anodic potential step for a short time followed by a cathodic sweep) have also been proposed (68-74). 

In recent reviews of monolayer oxide formation on gold it was claimed14-16 that oxidation of the metal commences at ca. 1.35 V in acid media with a shift to less anodic potentials on increasing the pH. Recent investigation28 has shown that at fast sweep rates this decrease is virtually linear with pH with a slope of ca. -18 mV per unit increase in pH (RHE scale). This value for is lower... 

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... 

Variation of the potential sweep rate of a linear sweep or cylic voltammetric scan causes characteristic changes in three important parameters of the generated voltammogram. These are the ratio of the magnitudes of the anodic to the cathodic peak currents the rate of the shift of half peak potential (this is... 

Figure 5.25 (a) Front panel of the virtual electrochemical NO analyzer showing the typical cyclic vol-tammetric response of the SODI-CNT-PPy-Pt electrode at control, 100,200,300,400,500, and 600 pM NO solution in 0.1 M PBS (pH 7.0) at scan rate of 100 mV s vs Ag/AgCI and the linear plot for the above concentrations anodic peak currents Ipa/pA vs [NO]/pM. (Ipa = 0.063 [NOJ-10.49, r = 0.999). (b) Block diagram of the virtual electrochemical NO analyzer, (c) Front panel and block diagram of the potential sweep VI. (d) Front panel and block diagram of the process VI. 

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