Method for Preparing Tungsten Trioxide Crystals with Controllable Growth of Crystal Surfaces

The invention, relating to the field of tungsten trioxide crystals, concretely discloses a method for preparing tungsten trioxide crystals with controllable growth of the crystal surfaces. The method is characterized by using tungsten boride as a precursor by wet chemical process and carrying out hydrothermal growth of the crystal surfaces to expose tungsten trioxide crystals with different proportions, so that the problem of providing tungsten trioxide catalysts with different redox abilities for different reaction systems can be solved; putting the precursor in a reaction vessel filled with an aqueous nitric acid solution, and carrying out heat treatment to obtain crystal surface-dominated tungsten trioxide crystals {002}; putting the precursor in a reaction vessel filled with a hydrofluoric acid solution or a hydrofluoric acid ethanol solution or a mixed solution of aqueous hydrofluoric acid and ethanol, carrying out heat treatment to obtain cubic hydrogen tungsten bronze crystals, and heating the hydrogen tungsten bronze crystals in air to obtain tungsten trioxide crystals with identical crystal surface proportion {002}, {200}, {020}. According to the invention, tungsten trioxide crystals with regular morphology, different crystal surface proportions, and good ability of oxygen production by water splitting can be prepared.

A tungsten trioxide controlled crystal growth plane preparation, characterized in dry: without any treatment with a commercial tungsten boride precursors, put it in a reaction vessel equipped with a nitric acid aqueous solution, the reaction After sealing the autoclave, a heat treatment oven, remove the reacted sample, washed with deionized water and dried, resulting in the nitric acid system, to give (002) crystal plane dominated crane trioxide crystals; or without any treatment in a commercial Crane boride as the precursor, put it with hydrofluoric acid or hydrofluoric acid aqueous solution or hydrofluoric acid in water, alcohol ko, ko alcohol mixed solution of a reaction vessel, the reaction was sealed, into the oven heating treatment, the reaction samples taken, washed with deionized water and drying, heat treatment in air, resulting in three crystal hydrofluoric acid systems face in equal proportions to obtain tungsten trioxide crystals.




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