Optical Detection of Electron Transport in Thin Films of Prussian Blue

Abstract

Abstract Potassium‐iron(III)‐hexacyanoferrate(II) (Prussian blue) is deposited electrochemically as a thin film (thickness: 300 nm) on a Pt‐disk substrate electrode. The relative change in optical reflectivity of this electrode is detected time‐resolved upon galvanostatic reduction of Prussian blue to Everitt's salt and subsequent reoxidation. Considering different transport properties of electrons and cations within the film, the experimental result is fitted by numerical modelling. The specific diffusion coefficient for electrons is deduced as 5·10 −11 cm 2 /s.