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Outstanding issues regarding the redox switching characteristics and the oxygen evolution reaction (OER) electrocatalytic behaviour of multicycled iron oxyhydroxide films in aqueous alkaline solution have been examined. Charge percolation through the hydrous layer has been quantified, using cyclic voltammetry, in terms of a charge transport diffusion coefficient D CT which admits a value of ca. 3 Â 10 À10 cm 2 s À1 . Steady-state Tafel plot analysis and electrochemical impedance spectroscopydoi:10.1039/b815338h pmid:19305893 fatcat:uqcnxabuyzan7hbc5wnzvi23ha