The PB film can be produced by electrochemical deposition[12e14].
In the present work, we conducted the electrodeposition
of PB film on an ITO plate in a solution containing FeCl3$6H2O and K3Fe (CN)6.
The cyclic voltametric method was used with the scan range from 0.2 V to 1.2 V and the scan rate of 0.05 V/s [20].
Fig. 1 shows the CVs of the electrodeposition processes, where two pairs of redox peaks were observed.
The pair at low potential end corresponds to the reaction (1),
whereas the pair at the high potential end corresponds to the
reaction (2). The reduced Fe (CN)64 could react with Fe3þ to form
PB film on the electrode surface according to reaction formula (3)
[21,22]. Also the reduced Fe2þ will be able to react with Fe (CN)63
in bulk solution to form Turnbull's blue by the reaction (4).
The experiment permits that Turnbull's blue and Prussian blue are the same substance [23].