Tungsten Trioxide Nano Film Preparation by Drop Coating Mmethod

The photoelectrochemical cell (PEC), which decomposes water to produce hydrogen and converts solar energy into chemical energy, is considered to be one of the most important ways to obtain energy instead of fossil energy. It is an important research direction in this field to find and study potential semiconductor materials by various methods.

At present, the common preparation methods of tungsten trioxide nano film are hydrothermal method, sol-gel method, atomic layer deposition method, electrodeposition method and chemical vapor deposition method. Compared with the high equipment requirements and complex preparation process of atomic deposition, electrodeposition and chemical vapor deposition, the equipment of hydrothermal method and sol-gel method is relatively simple and the temperature requirements are low. However, none of the above methods can be used to prepare tungsten trioxide nano films with high photoelectric performance on the premise of low experimental cost, simple operation and high safety.

In order to solve the above technical problems, we can use the drop coating method to prepare the tungsten trioxide nano film:

Step 1. Dissolve the tungsten hexachloride in anhydrous ethanol, stir evenly to obtain the precursor solution; the molar concentration of the tungsten hexachloride in the precursor solution is 5mmol / l-60mmol / L;

Step 2. Apply the precursor solution in step 1 of 5 uL-100 uL to the substrate surface by drop coating method and blow dry, and then heat treat the substrate for 3min-5min at the temperature of 80 ℃ - 150 ℃ and cool it to room temperature;

Step 3. Repeat step 2 until a film layer is obtained on the substrate surface;

Step 4. Heat the film layer in step 3 to 400 ℃ ~ 550 ℃ and burn it for 2-6 hours. After high temperature burn, tungsten trioxide nano film is obtained on the substrate surface.

The above-mentioned process equipment has low requirements, simple operation, low cost and high safety performance. The prepared tungsten trioxide nano film, as an efficient photoanode material, shows excellent photoelectric performance and high stability, and can be applied in the system of photoelectric chemical decomposition of seawater for hydrogen production, effectively converting solar energy into clean energy, effectively alleviating the shortage of fossil fuels and the environment serious pollution.

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