Preparation Method of Tungsten Trioxide Graphene Composite Material (Ⅲ)

Through the introduction of the preparation methods (Ⅰ) and (Ⅱ) of tungsten trioxide graphene composite materials, we can know clearly that they all have the disadvantages of complex production process, long reaction time, difficult solid-liquid separation, and low yield. 

However, after the continuous efforts of experts in the past few years, the deficiencies of these two preparation methods have been greatly improved.

In order to overcome the shortcomings of existing synthesis technology, experts provide a new method for preparing tungsten trioxide/nitrogen-doped graphene composite materials. The specific steps are as follows:

(1) According to the prepared amount of tungsten trioxide/nitrogen doped graphene composite and the content of tungsten trioxide in it, weigh the corresponding amount of ammonium tungstate and appropriate amount of ammonium nitrate and organic fuel, dissolve in a small amount of water, and add the corresponding in the graphene oxide hydrosol with a volume concentration of 0.5-5 g/L, a uniform mixed dispersion is obtained by stirring and ultrasonic.

(2) Heat and concentrate the dispersion obtained in (1) until it becomes viscous, put it in a furnace at a temperature of 300 to 900 ℃, and heat it to ignite. The solid product obtained after the combustion is completed is tungsten trioxide/nitrogen doped graphene composite.

Note: The ammonium tungstate described in step (1) is ammonium metatungstate or ammonium paratungstate. In step (1), the number of moles of ammonium nitrate is 1-8 times the number of moles of tungsten in the ammonium tungstate. The organic fuel in step (1) is one or more of glycine, urea or ethylene glycol, and the number of moles of organic fuel added is 0.1-5 times the number of moles of ammonium nitrate.

The main characteristics of the new preparation method are as follows:

(1) Tungsten trioxide in the product is nano-particles, uniform in size and good dispersibility on graphene.

(2) The tungsten trioxide is uniformly dispersed in nitrogen-doped graphene through a simple and fast combustion method, which has the characteristics of low equipment requirements, simple and fast, high synthesis yield, low production cost, and environmental protection, and is very suitable for industrial production.

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