the activation overpotential current and mass transfer limiting current combined in a series to form total current.But how they are competitive to each other to get significant water oxidation?
You can perform chronoamperometric rotating disk electrode (RDE) studies for an electrochemical reaction with mixed activation and mass transfer control, the mass transfer limited current is given by the Levich equation.
Have a look at this Wolfrma demonstation
http://demonstrations.wolfram.com/RedoxReactionEAtARotatingDiskElectrodeRDE/
http://demonstrations.wolfram.com/RedoxReactionEAtARotatingDiskElectrodeRDE/
To help understand these concepts and the applicability of Levich Koutecky plots, I suggest the following papers;
1.- Phys. Chem. Chem. Phys., 6 (2004) 4009-4017.
2.- Electrochim. Acta, 52 (2007) 7396-7403.
For an example of application on Iridium, can be read in J.Phys.Chem. C 117 (2013) 25269-25275.
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