Morphology and Structure of Electrodeposited Prussian Blue and Prussian White Thin Films

Abstract

The compound Prussian Blue (PB), and its reduced form Prussian White (PW) are nowadays considered, in applied and fundamental research groups, as potential materials for sustainable energy storage devices. In this work, these compounds were prepared by potentiostatic electrochemical synthesis, by using different deposition voltages and thicknesses. Thick, compact and uniform layers were characterized by scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. Results have shown a well-defined transition voltage for growing Prussian Blue phases and a strong dependence of the morphology/growing orientation of the samples as a function of applied potential and thickness. For the negative potential tested of −0.10 V vs. SCE, a mixture of cubic and rhombohedral phases was observed.

Resistive Switching in Electrodeposited Prussian Blue Layers

“…Additionally, small amounts of clusters, consisting of several cubes were found on the surface. The preferential growth direction of the cubes was [100] in agreement with previous results [ 20 ].…”

“…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 ]. Among them, electrodeposition is a very effective method for the growth of PB thin films on a solid substrate due to its high reproducibility, low cost, and ease of controlling deposition parameters [ 20 ].…”

“…The growth of PB films has been successfully shown by electrodeposition [ 20 ], liquid phase epitaxy [ 21 ], and spin coating [ 22 ]. Among them, electrodeposition is a very effective method for the growth of PB thin films on a solid substrate due to its high reproducibility, low cost, and ease of controlling deposition parameters [ 20 ].…”

Low Temperature Deposition of Highly Cyclable Porous Prussian Blue Cathode for Lithium‐Ion Microbattery

“…In Raman spectra (Figure 1f), wavenumber peaks at 2090 and 2120 cm −1 can be associated to CN − group attached to Fe 2+ whereas peak at 2150 cm −1 can be associated with CN − group attached to Fe 3+ ions. [ 28 ] The dominant peak at 2150 cm −1 indicate that the majority of Fe atoms are in +3 state, that is, Prussian blue and not Prussian white.…”

Flexible electrochromic devices prepared on ultra-thin ITO glass

“…The PB (Fe 4 [Fe(CN) 6 ] 3 ) thin films were electrodeposited from an aqueous electrolyte containing potassium hexacyanoferrate(III) (K 3 Fe(CN) 6 ), and iron(III) chloride (FeCl 3 ). 35,36 By using a PGU 20V-5A-E potentiostat/galvanostat, a current density of 25 mA cm À2 was applied for 200 s resulting in a PB layer with a nominal charge density of 5.0 mC cm À2 . Finally, the PB electrodes were annealed at 100 1C for 20 min.…”