Copper niobate photocathode material, preparation method and application of copper niobate photocathode material in photocatalytic hydrogen production

The invention belongs to the technical field of advanced materials, and relates to a copper niobate photocathode material, a preparation method and application of the copper niobate photocathode material in photocatalytic hydrogen production. The preparation method comprises the following steps: preparing a first precursor film on the surface of a substrate by using an ammonium niobate oxalate hydrate solution by using a spray pyrolysis method, and preparing a second precursor film on the surface of the first precursor film by using a copper nitrate solution by using a spray pyrolysis method; and placing the substrate with the first precursor film and the second precursor film in an air atmosphere for annealing treatment to obtain the film. The copper niobate photocathode material m-CuNb2O6 thin film prepared by the method does not contain CuO, Nb2O5 and other copper niobate phases, is relatively high in purity, has the characteristics of high density, strong adhesive force and the like, has relatively high P