Potential, electrokinetic redox

Any of various functions from which intensity or velocity at any point in a field may be calculated. The driving influence of an electrochemical reaction. See also active potential, chemical potential, corrosion potential, critical pitting potential, decomposition potential, electrochemical potential, electrode potential, electrokinetic potential, equilibrium (reversible) potential, free corrosion potential, noble potential, open-circuit potential, protective potential, redox potential, and standard electrode potential. 

A detailed discussion of the foregoing electrokinetic model as well as simplified versions of Eqs. (5.8) and (5.9) pertaining to the case of mass transfer controlled as well as irreversible electrode reactions are given in a recent paper by McLendon et al.I94) Suffice it here to evoke some general features concerning the tuning of the potential of the microparticle by the two redox couples. In the case where both redox couples are reversible on the microelectrode in question (k - < , k °°) the particle potential will lie approximately in the middle between the Nernst potentials E and E . If E and E are sufficiently separated, the reaction current will be high and approach the diffusion controlled limit. If, on the other hand, one couple is reversible while the other is not, the particle potential will remain near to the Nernst potential of the reversible couple. 

In the classification given above, redox, thermoelectric, and photoelectric potentials in the BLM are discussed in a later section, whereas a brief summary will be given on the electrokinetic potential relevant to membrane electrochemistry. 

A detailed electrokinetic analysis of osmium mediator/laccase biocathodes was published in 2008 by GaUaway and Calabrese Barton [31]. In their work, the authors described the biomolecular rate constants for mediation to be between 250 and 9.4 X10" s when the redox potentials of mediator and laccase are close or far... 

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