Charge transfer rate constant

This means that the PMC signal will, apart from the generation rate of minority carriers and a proportionality constant, be determined by the interfacial charge transfer rate constant kr and the interfacial charge recombination rate sr... 

The interfacial charge-transfer rate constant can be determined when the PMC signal and the photocurrent are measured simultaneously. When the interfacial charge transfer is, on the other hand, very large and Aps negligible, the PMC value becomes... 

T.W. Hamann, F. Gstrein, B.S. Brunschwig, N.S. Lewis, Measurement of the driving force dependence of interfacial charge transfer rate constants in response to pH changes at n-ZnO/ H20 interfacies, Chem. Phys. 326 (2006) 15-23. 

Lewis NS (1991) An analysis of charge transfer rate constant for semiconductor-liquid interfaces. Annu Rev Phys Chem 42 541... 

The electrode process of the Cd(II)/ Cd(Hg) system was investigated in water-DM SO [61] and hexamethylphosph-ortriamide (HMPA) solutions [62]. The formal potentials, charge-transfer rate constant, and diffusion coefficients were determined. In the presence of adsorbed HMPA molecules, the rate constant was found to he dependent only on the surface phase composition. 

The Charge Transfer Rate Constant. It is interesting at this point, however, to consider how the dynamics of p(z, t) is related to the usual measure of kinetics, the reaction rate constant. The key quantity to consider is the survival population S(t),... 

The relationship between the intensity dynamics near the peak wavelength of LE ( 420nm) and the conventional description of charge transfer rate constants is clearly established with GLE simulations. We observe that the... 

We have seen that the instantaneous faradaic current at an electrode is related to surface concentrations and charge transfer rate constants, and exponentially to the difference of the electrode potential from the E° of the electrochemical couple. This is represented in Figure 5.1c by Zf. With very few exceptions, this leads to intractable nonlinear differential equations. These systems have no closed form solutions and are treatable only by numerical integrations or numerical simulations (e.g., cyclic voltammetry). In addition, the double-layer capacitance itself is also nonlinear with respect to potential. 

The peak shape and peak current magnitude are strongly influenced by the chemical and electrochemical processes involved. This is true of all step-based techniques since they tend to stress the charge-transfer rate constant. Slow rates lead to lower currents and broader peaks. 

In the above, L is the hole diffusion length, t is the lifetime, p0 is the equilibrium hole density, and is the equilibrium band bending voltage. These equations are good approximations when 5 is not too small and are equivalent to that given in (2J where the exchange current parameter is used instead of the charge transfer rate constant. More accurate... 

In Sect. 3.2, non-reversible charge transfer reactions will be studied, with emphasis on their most characteristic aspects, such as the dependence of the halfwave potential on the heterogeneous charge transfer rate constant and the time of the application of the potential, as well as the size and geometric characteristics of the working electrode. 

Similar words of caution belong with redox polymers. Polyvinylferrocene typifies the type of polymeric compound where the redox centre is an integral part of the polymer. In view of ferrocene s well tried mediation talents this would seem an ideal choice of model, but the heterogeneous charge transfer rate constant for this redox polymer is typically 102 - 103 lower than the solution species (47) and although catalytic activity can usually be partially retained the kinetics of electron transfer are undesirably slow.. 

The charge-transfer rate constant is expressed in Gumeyan terms (Sec. 9.6) by the equation ... 

Steps 2-5 are included in the charge transfer rate constant, ka or kc, and include adsorption of the reagent on the electrode surface, which in the case of a soluble product will afterwards de-adsorb. Steps 2-4 can be seen as a type of pre-equilibrium before the electron transfer. During the electron transfer itself all positions of the atoms are frozen, obeying the Franck-Condon principle (adiabatic process). 

Distinguish Between Matched and Mismatched Sequences by Measuring the Charge Transfer Rate Constant Through DNA... 

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