UV-Visible and IR Spectroelectrochemical Studies of FeVO4 Sol-Gel Films for Electrochromic Applications
Source abstract
Abstract
The sol-gel synthesis route, in combination with dip-coating deposition, was used for the preparation of FeVO4 films. TEM measurements of Fe/V (1 : 1)-oxide films heated at 400°C reveal that the films consist of a triclinic FeVO4-I and an orthorhombic FeVO4-II phases with a grain size of up to 50 nm. The electrochromic properties of the films were tested in 1 M LiClO4/propylene carbonate (PC) using various electrochemical techniques and in-situ UV-visible spectroelectrochemical measurements. The best compromise between the charge capacity per film thickness (Qd−1 = −0.14 mC cm−2 nm−1), electrochemical stability (>1000 cycles) and optical modulation (ΔTvis = 0.15) was achieved in the potential range of 4.80 to 1.80 V vs. Li, which suggests that FeVO4 films can be used as counter-electrodes in electrochromic devices.
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Research context
OpenAlex topics: Transition Metal Oxide Nanomaterials · Polyoxometalates: Synthesis and Applications · Catalysis and Oxidation Reactions
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