In the first part of this paper, IrO2 electrodes produced by thermal decomposition of H2IrCl6 precursor were manufactured using the spin coating deposition technique, where centrifugal forces spread the precursor solution with simultaneous evaporation of the solvent on the rotating Ti substrate. It was found using this technique, that it is possible to obtain thin and uniform IrO2 coatings with controlled loadings. The influence of the concentration of iridium salt in the precursor solution (c(0)) as well as the influence of the rotation speed at which the substrate spins (omega) on the IrO2 loading have been studied using voltammetric charge measurements. From these results, a simple relation has been proposed for the estimation of the IrO2 loading for a given c(0) and omega.