Preparation and electrochromic properties of vanadium oxide two-dimensional materials

The electrochromic properties of V₂O₅ are directly related to the penetration depth of cations and the approachability of electroactive sites. In the present work, bulk V₂O₅ was exfoliated into two-dimensional nanosheets in formamide solution. Transmission electron microscope, energy dispersive spectroscopy and cyclic voltammetry were used to characterize its structure and properties. Our results show that V₂O₅ gradually drops off into two-dimensional nanosheets in formamide solution. The nanosheets exhibit good cyclic stability and fast response speed. Such a fabrication method is expected to be applied in the optimization of electrochromic performance of V₂O₅. (paper)