Nano-vanadium pentoxide films for electrochromic displays

Abstract

We demonstrate the benefit of home-made nanopowder precursors on the electrochromism of V 2 O 5 films deposited by the "Doctor Blade" method. Using the polyol process, nano-structured V 2 O 5 powder were synthesized. Orthorhombic V 2 O 5 thin films deposited from as-synthesized powder exhibit good cycling stability associated with significant reflectance modulation in both lithium and sodium based electrolytes. The orange to green reversible color change appears well suitable for display application. To conclude, the electrochromic performances of complete devices using WO 3 as complementary electrode and 0.3 M Lithium Bis(Trifluoromethanesulfonyl)Imide LiTFSI in BMITFSI plastified with polymethylmetacrylate (PMMA) membrane electrolyte are reported.

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

“…Electrochromic V 2 O 5 coatings have been prepared by electrodeposition [11,12], "Doctor Blade" [13], reactive sputtering [14], polyol process [15], sol-gel [16], and hydrothermal growth [17]. Strategies…”

Dual‐Fiber Approach toward Flexible Multifunctional Hybrid Materials

“…V 2 O 5 xerogels are known to exhibit both electronic and ionic conduction, which depend on the oxidation state of vanadium (V 5+ vs V 4+ ) and the hydration state of the xerogel . Therefore, V 2 O 5 xerogels have received great interest as electroactive compound in various electronic and redox‐related applications, including electrochromic displays, solar cells, or batteries . Here, the in‐plane electrical conductivity of the 2w‐VNF films was determined to be 1.6 S cm −1 , which is significantly higher than for previously reported V 2 O 5 xerogels (10 −5 –10 −2 S cm −1 ) .…”

“…These stresses are generated by the volume expansion of the V 2 O 5 structure upon cation intercalation alongside with the V 5+ reduction . Owing to the brittleness of polycrystalline V 2 O 5 films, transparent indium tin oxide (ITO) coated glass is commonly used as mechanical support as well as electrode for optical applications . Both, the polycrystalline active material and the ITO support exhibit an inherent mechanical stiffness and low fracture resistance (i.e., toughness), thus restricting the possibility of producing flexible smart materials.…”

Covalent Bonding of PANI and p‐Phenylenediamine‐Functionalized GO Using N,N′‐Dicyclohexylcarbodiimide as Dehydrating Agent for Electrochromic Applications

“…Since amorphous tungsten trioxide (WO 3 ) electrochromic material was discovered by Deb in 1969, such special materials possessing reversible optical change (transmittance, absorbance and reflectance) at different external potentials have attracted a large amount of attention . This unique ability can be applied in various fields such as smart windows, rear‐view mirrors for automobiles, military camouflage, etc .…”

“…Since amorphous tungsten trioxide (WO 3 ) electrochromic material was discovered by Deb in 1969, [1] such special materials possessing reversible optical change (transmittance, absorbance and reflectance) at different external potentials have attracted a large amount of attention. [2][3][4] This unique ability can be applied in various fields such as smart windows, rear-view mirrors for automobiles, military camouflage, etc. [5][6] As a typical electrochromic material, polyaniline (PANI) has been intensively studied because of its high conductivity, excellent environmental stability, fast response time, low cost, easy synthesis, and so on.…”