The physical and electrochromic properties of Prussian Blue thin films electrodeposited on ITO electrodes

Abstract

In this article, a set of Prussian Blue (PB) thin films with different electrodeposition times (25 s, 50 s, 75 s, 100 s and 150 s) in air at ambient temperature was prepared. The layers were characterized by a variety of techniques which include, field effect scanning electron microscopy, energy-dispersive X-ray spectrometer, X-ray diffraction, Fourier transform infared spectroscopy, UV-Vis spectrophotometry, and electrochemical analysis. A simple and exact electrochemical method was used to estimate the optimal voltages for coloring and bleaching of different PB layers. Controlling electrodeposition time along with applying suitable voltage enabled us to investigate and improve electrochromic properties of PB layer. The sample prepared under 75 s deposition time showed probably a composition intermediate between the insoluble and soluble form. Furthermore, this sample (S75) shows a better electrochromic properties. High value of electrochromic contrast 55.36 % at 555 nm and well stability of ion exchange by cycling are the characteristics of this layer. The control of the deposition time resulted in an increase of 9.38 times of the contrast ratio and corresponding values for optical density (DOD) of the PB layers.

Stable films of zinc-hexacyanoferrate: electrochemistry and ion insertion capabilities

“…The advantage of the electrodeposition consists of the in situ functionalization of the electrode surface. This allows to tailor the thin film by controlling some experimental variables such as the applied potential, the precursor concentration, and the supporting electrolytes [4,5]. The electrode modification could be achieved also by adsorption or via mechanical attachment.…”

Resistive Switching in Electrodeposited Prussian Blue Layers

“…When replacing iron ions with other metals such as or , a family called Prussian blue analogs is created [ 14 ]. Due to the physical and chemical properties of Prussian blue, the study of this material and its analogs has increasingly attracted the attention of the scientific-technological community due to its promising applications in electrochemical sensing, electrochromic devices, batteries, supercapacitors, and magnetic/ photomagnetic systems [ 15 , 16 , 17 , 18 , 19 ]. The growth of PB films has been successfully shown by electrodeposition [ 20 ], liquid phase epitaxy [ 21 ], and spin coating [ 22 ].…”

A Self-Bleaching Electrochromic Mirror Based on Metal Organic Frameworks

“…Figure 2 a shows XRD patterns of the ZIF-67 powder, ZIF-67/Ag/ITO, Ag/ITO and bared ITO. As can be seen, the peaks located at 31°, 37° and 51° are assigned to In 2 O 3 , indium and tin [ 24 ]. For the Ag/ITO, several characteristic peaks at 38°, 44° and 64.5° can be observed, corresponding respectively to (111), (200) and (220) planes [ 25 ].…”