The PH value of the solution was regulated to 10 by NaOH and the color of the solution turned into dark blue. The deposition was carried out in a configured glass cell at 60 1C, in which the ITO substrate, a platinum plate, and an Ag/AgCl electrode in a saturated KCl solution served as the working electrode, the counter electrode and the reference electrode, respectively. During the electrodeposition, the potential was set to be of 0.3 V vs the reference electrode and the duration of the deposition was 50 min.