Preparation method of tungsten trioxide nano film

Abstract

The invention discloses a preparation method of a tungsten trioxide nano film. The method includes the steps that firstly, tungsten hexachloride is dissolved in anhydrous ethanol, and a precursor solution is obtained after uniform stirring; secondly, the surface of a substrate is dropwise coated with the precursor solution through a dropwise coating method and is blown dry, heat treatment is performed for 3-5 min under the condition that the temperature of the substrate is 80-150 DEG C, and a film layer is obtained on the surface of the substrate after the substrate is cooled to room temperature; thirdly, the second step is repeatedly executed till the film layer is obtained on the surface of the substrate; and fourthly, the film layer is heated to 400-550 DEG C, high-temperature calcination is performed for 2-6 h, and the tungsten trioxide nano film is obtained on the surface of the substrate after high-temperature calcination. The preparation method is low in requirement for experimental equipment, easy to operate, low in cost and high in safety performance, the prepared tungsten trioxide nano film serves a photo anode material to be applied to a photoelectric chemical decomposition seawater system, good photoelectric performance and high chemical stability are shown, and low-cost and high-efficiency application can be achieved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor electrodes, and in particular relates to a preparation method of a tungsten trioxide nano film. Background technique [0002] Photoelectrochemical cells (PECs) split water to produce hydrogen and convert solar energy into chemical energy. It is considered to be one of the most important ways for human beings to obtain energy by replacing fossil energy, so it has attracted widespread attention. Finding and researching potential semiconductor materials through various methods is an important research direction in this field at present. Compared with traditional semiconductor materials such as titanium dioxide and iron oxide, tungsten trioxide has a suitable band gap (2.5eV-2.9eV), and the electrode potentials of the valence band and conduction band are 3.2eV and 0.4eV, respectively, which can oxidize water. Cheng O 2 , and has the advantages of low price, high stability in acidic and neutral...

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Problems solved by technology

However, none of the above existing methods can prepare tungsten trioxide nano-films with high photoelectric performance under the premise of low experimental cost, simple operation and high safety, and the tungsten trioxide nano-films prepared by the existing technology are used as photoanodes in During the photoelectrochemical water splitting system, the electrolyte used is mostly an acidic solution (such as 0.5mol / L sulfuric acid solution). At present, there is no report of directly using natural seawater as the electrolyte in the photoelectrochemical water splitting system, and in the prior art There is no tungsten trioxide nanofilm that can show high photoelectric performance and high chemical stability in the photoelectrochemical decomposition of seawater system

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