Kinetics of Redox switching of Prussian Blue films in (NH_4)_2SO_4 solutions and Selectivity studies of the films between Ammonium and Potassium Ions Using The Electrochemical Quartz Crystal Microbalance

摘要

The very favorable partitioning of NH_4~+ as compared to K~+ does not appear to correlate either with their hydrated or ionic radii. Their crystal ionic radii are estimated to be approximately 0.133 nm (K~+) and 0.143 nm (NH_4~+) which would be increased, for their hydrated ions by ～0.14 nm, the average radius of a water molecule.(3).Thus, we suggest that a heterogeneous mixture of ferric potassium ferrocyanide (Prussian Blue) and ferric ammonium ferrocyanide (Milori Blue) formed.