Ammonium Paratungstate Used for Preparing Tungsten Trioxide Nano Film 1/2

Photoelectrochemical Cells Hydrogen Production (PEC) technology is based on solar energy and water, and the two substances are renewable with no byproduct, not pollution to the environment, and also can be applied to small as well as large scale development. Therefore, the technology is the most attractive way to produce hydrogen by solar energy. The property of photoelectric which is consisted of semiconducting materials determines the efficiency of PEC. Compared with the traditional semiconductor materials such as titanium dioxide and zinc oxide, W0₃ can be well applied with the advantages that narrow band gap (2.5ev), absorbing solar spectrum in a wavelength greater than 500nm in visible light, and low price, good chemical stability, non-toxic, no corrosion.



The method for preparing nano tungsten trioxide film using ammonium paratungstate (APT) as raw material we describes in this paper, has advantages that stable precursor solution, reuseable, production process simplified, cost reduced, high purity of the obtained product and so on.
The reagent used: apt, modifier (can be one of citric acid, polyethylene glycol octyl phenyl ether, oleic acid and acetyl acetone), deionized water, dispersing agent. The dispersing agent plays the role of constituting large numbers of mass weaving structures to make sure the crystals not easy broken in the dry, hot environment; and the modifier will increase stability of the precursor solution, also prevent the nano tungsten trioxide to reunion thus leading the film to peeling in the condition of high temperature.
Coating substrates: aluminum, stainless steel, glass, graphite or silicon wafers.