Peak current shifted ratio

In Fig. 4.18b, the effects of the electron transfer coefficient (a) on the ADDPV curves is shown. A decrease of a leads to the decrease of the peak currents together with the shift of the peak and crossing potentials toward more negative values. The ratio of the peak currents (l/ he// hel) also varies with a, and the greater the a value, the greater the l/ he//j, ll llL ratio. It is worth highlighting the anomalous... 

SO that the wave shifts toward negative potentials by about 30/n mV (at 25°C) for a tenfold increase in v. In the intermediate region of A (KO), that is, 5 > A > 0.1, information can be obtained from the ratio of anodic and cathodic peak currents these are de-... 

At the physiological concentration with Factor VIII, a set of two peaks (anodic peak 2, cathodic peak 5 in Figure 13) exhibits a shift of peak potential of 30 mV/decade of scan rate. Unlike in the case of Factor V, the ratio of the anodic to cathodic peak currents decreases with increase of scan rate. Thus with Factor VIII, it appears that a reversible charge transfer reaction is succeeded by a chemical reaction. 

The effect of decreasing equilibrium constant, K, is the shift of the current-potential curves for the reduction process to more negative potentials along with decreasing the peak current height (cf. Fig. 35). A kinetic DPP peak (responding to the reduction of free metal ions) is always small (in comparison to the reduction peak of the parent metal complex). The peak current ratio Ip+/Ip of the metal complex tends to be 1.29. The positive/negative peak separation is nearly 10 mV which is the same value as the peak amplitude AE. This exactly fits the criterion for a CrevE mechanism in DPP. 

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 2-10 Characteristics of the E, mechanism (a) peak potentials and currents and (b) measurement of the shifted peak current ratio.

A plot of the square root of the scan rate (10 to 60 mV s Ws. peak current density for the electrochemical oxidation was linear, and this shows that the oxidation current is diffusion-controlled, with negligible adsorption of the electroactive species on the electrode surface. The peak potential value of the irreversible wave was also observed to shift positively with increasing sweep rate. A linear increase of peak current density was found for the concentration range from 0.01 mM to 0.5 mM of analyte in 0.1 M phosphate buffer (pH 6.7) at a constant sweep rate of 60 mV s l A signal to background ratio of 3 was obtained in this case at a concentration as low as 5 pM. 

The interference of lead in the sample solution was also evaluated. The equivalent molar ratio of Ni/Pb did not show any significant effect on the detection of Ni. Below a ratio of 1, the peak current increased and the peak potential shifted positively with... 

Under operating conditions, peak power density increased gradually from 500 C to 650 C, shifted to higher current density. It reached the maximum value of about 375 mW cm at 650°C under a current load of 750 mA cm when the cell was exposed to the mixed gas with a 02 C ratio of 0.6. 

Thin films of a composite nickel-iron (9 1 Ni/Fe ratio) and iron-free oxyhydroxides were deposited from metal nitrate solutions onto Ni foils by electroprecipitation at constant current density. A comparison of the cyclic voltammetry of such films in 1M KOH at room temperature (see Fig. 6) shows that the incorporation of iron in the lattice shifts the potentials associated formally with the Ni00H/Ni(0H)2 redox processes towards negative potentials, and decreases considerably the onset potential for oxygen evolution. The oxidation peak, as shown in the voltammo-gram, is much larger than the reduction counterpart, providing evidence that within the time scale of the cyclic voltammetry, a fraction of the nickel sites remains in the oxidized state at potentials more negative than the reduction peak. 

The ratio of peak photocurrent to dark current was as high as 300 at 300 °K and 600 at 120 °K. The action spectrum of photoconductivity of this and other studied polydiacetylenes24 is significantly shifted to shorter wavelengths from the absorption spectrum. 

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