Abstract
An electrochemical method for the preparation of thin films of the Na +-containing Prussian Blue, NaFe III [ Fe II ( CN) 6] · nH 2 O, is proposed. The system has been studied electrochemically in sodium and potassium electrolytes, as well as in solid-state, ie in the absence of contact with any liquid electrolyte phase. Hydrated-Na + counterions are sufficiently mobile in NaFe[Fe(CN) 6] to support the system's redox reactions. During voltammetric experiments in aqueous potassium solutions, structural Na + cations in the film are irreversibly replaced by smaller hydrated-K +, and the material undergoes reorganization to the commonly studied potassium-containing analogue, KFe III [Fe II(CN) 6]. The films have been analyzed using scanning electron microscopy equipped with X-ray fluorescence elemental analysis probe. Structural differences between NaFe[Fe(CN)] 6 and KFe[Fe(CN) 6] are apparent from X-ray absorption fine structure spectroscopy and ir measurements. A comparison is also made to so-called “insoluble” Prussian Blue, Fe III 4[Fe II(CN) 6] 3.
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