Electrochromic Properties of Sol-gel Coating of Nb2O5 and Nb2O5:Li+

Abstract

Thin solid films of Nb2O5 and Nb2O5:Li+ were prepared by the sol-gel process using the sonocatalytic method. The films reported here were prepared from a NbCl5 as precursor and butanol as solvent. Through the addition of lithium salt LiCF3SO3 to the precursor solution, films with different electrochemical performance were obtained. The electrochemical and optical responses of the films were determined from the cyclic voltammetry and chronoamperometry measurements using a 0.1 M LiClO4/PC as electrolyte. The electrochromic properties of the films were investigated using in situ spectroelectrochemical method. They exhibit a gray coloration under Li+ insertion with a reversible variation of the transmittance in the visible and near infrared range between 20% and 80%

Electrochromic Properties of Graphene Doped Nb2O5 Thin Film

“…1b. CV peaks (oxidation and reduction) of graphene and graphene oxide seen in the range from −1.0 V to 0.8 V. 28 Reduction peak of Nb 2 O 5 is close to −1.0 V. 7 In Fig. 1b, reduction peak for our deposited layer was observed in 0.65 V. Thus, graphene doped Nb 2 O 5 active layer was shown a good electrochromic behavior in coloring and bleaching route.…”

“…5 Since Reichman and Bard discovered the electrochromic properties of Nb 2 O 5 , several investigations have been performed to show performance of the electrochemical properties. 6,7 Nb 2 O 5 is a cathodic coloration material and it turns to blue or brown-like color during the coloration process. 8 The equation of electrochromic coloration and bleaching process for Nb 2 O 5 thin film is given below;…”

Potentiometric Titration of ${\rm NH}_{4}{\rm VO}_{3}$ and ${\rm Na}_{2}{\rm HAsO}_{4}$ in Molten ${\rm NaNO}_{3}$ at 623 K Using a Novel Solid-State Glass/${\rm Nb}_{2}{\rm O}_{5}$ pH Indicator Electrode

“…The final heat treatment was performed at 560°C in air atmosphere for 15 min. The resulting coatings were transparent and homogeneous without any visual cracking [19].…”

“…The solution mixture was submitted for ∼5 min to the action of a 95 W, 20 kHz ultrasonic irradiation from a sonicator resulting in a transparent and viscous solution [19].…”