The slow oxygen evolution reaction (OER) at the anode is a significant barrier to the synthesis of green hydrogen from water electrolysis. Although theoretical methods have yielded many OER mechanisms, experimental validation, and parameter extraction are still difficult to achieve. This study uses experimental techniques coupled with modeling studies in an attempt to elucidate the detailed mechanism of OER on noble metal catalysts in an alkaline medium. Potentiodynamic polarization(PDP) studies are conducted on Pt inverted rotating disk electrode (IRDE) at different electrolyte concentrations across varying electrode rotations. The polarization data so obtained is used to evaluate several proposed reaction mechanisms. The kinetic parameters are optimized with respect to the polarization data in search of the mechanism that offers the best fit and hence describes the data most accurately. The PDP results from Pt not only confirm that OER is mass transfer limited at higher overpotentials but also reveal a direct correlation between higher concentrations, electrode rotation speeds, and increased currents. Optimization studies of Pt and further studies on Au are in progress.