The invention relates to a
vanadium-
niobium bimetallic
oxide electrochromic film and a preparation method and application thereof.The electrochromic film comprises conductive glass and a
vanadium-
niobium bimetallic
oxide film on the conductive face of the conductive glass, and the
vanadium-
niobium bimetallic
oxide film comprises two phases of Nb2V2O9 and V3O7, comprising any one of a nano-rod structure, a nano-particle stacking structure or a nano-net structure. The preparation method comprises the following specific preparation steps: dissolving a niobium source, a vanadium source and
oxalic acid dihydrate in an
ethanol-water mixed
solvent, and stirring and dissolving to obtain a precursor solution; inserting FTO conductive glass into the precursor solution, and carrying out
solvothermal reaction; and after the reaction is finished, cooling to
room temperature, cleaning and
drying to obtain the vanadium-niobium bimetallic oxide electrochromic film. Compared with single
niobium oxide, visible light-near
infrared dual-band regulation and control can be achieved, electrochromic response is achieved in the visible light band and the near
infrared band, the
light modulation amplitude is large, the color changing
voltage range is small, and synthesis conditions are mild.