Electronic current, limiting factors

Generally, the limiting factor for the electronic current flow is the transport of these ions. Therefore the electrolyte solution should have a low resistance. 

Figure 9.3.7 Koutecky-Levich plots at potential where the rate of electron transfer is sufficiently slow to act as a limiting factor, and at E2, where electron transfer is rapid, for example, in the limiting-current region. The slope of both lines is (0.62nFACQDQ v ) ...

A significant limiting factor to current density output in these redox polymer films is the ease of physical displacement of the redox center in the polymer film to allow intimate contact, and electron transfer, between the redox complex and the biocatalyst [81]. To address the mobility of the redox complex sites in the redox polymer, represented by an apparent diffusion coefficient D, Mao et al. [82] have grafted a... 

Since in the system investigated only the linear velocity changes, all other variables and constants are lumped together in K. Assuming now that the electronic conductivity of the scale is the limiting factor rather than the ionic one, the cathodic current can be set to be proportional to the electron hole concentration times the electron hole mobility ... 

Electromigration is the limiting factor for the maximum amount of current that can be passed through a conductor. The vacancy flux (/) due to the force induced by electromigration is related to multiple other parameters by Eq.3 [42], c is the vacancy concentration, D the diffusivity, k Boltzmann s constant, T the absolute temperature, e the electronic charge, E the applied electric field, p the resistivity and... 

When trying to identify performance-limiting factors in PEC photoelectrodes, the quantum efficiency as a function of wavelength is a particularly useful parameter. The definition of the external quantum efficiency is the fraction of the incident photons that is converted to electrons that can be measured by the outer circuit. This is the IPCE incident photon-to-current conversion efficiency), which is given by... 

---