Investigation of electrochromic device based on multi-step electrodeposited PB films

Prussian blue (PB) is a well-known electrochromic material due to its fast response and high cycle stability. We used the multi-step electrodeposition to prepare the PB films (S-PB) with different thickness. SEM image shows that as-grown film has small particles on its surface, which is beneficial for improving electrochromic properties of thicker PB film. The S-PB film with a thickness of 410 nm shows a high transmittance modulation of 82.04% at λ = 680 nm. S-PB and CeO 2 -TiO 2 -Li films were used as working electrode and counter electrode separately to prepare electrochromic devices (ECDs), both of which are inorganic anode materials. At 680 nm wavelength, the device based on double anode materials changes transmittance from 71.25 to 11.71% and the coloration efficiency is 73.5 cm 2 /C. Moreover, the optical modulation of ECD does not change significantly when performing 10,000 cycles.