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Preparation method of tungsten trioxide color-changing material

A technology of tungsten trioxide and color-changing materials, applied in the field of materials, can solve problems such as explosion hazards, and achieve the effects of low cost, low pressure requirements and convenient use.

Inactive Publication Date: 2021-01-29
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The most important thing is that the electrochemical sensor is charged in principle, and there is a possibility of generating electric sparks during work, so it still has a potential explosion hazard; in addition, the sensor is sensitive to other reducing gases CO, CH 4 and NH 3 With the possibility of cross-sensitivity, traditional electrochemical sensors still have some insurmountable problems in terms of safety and selection sensitivity

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] Below in conjunction with embodiment the present invention is described in further detail:

[0016] Step 1-1: First accurately weigh 5.0g of Na 2 WO 4 2H 2 O, put it in a beaker, then add 30ml of distilled water, stir with a glass rod and wait for it to dissolve, use 60ml of 3mol / L hydrochloric acid solution prepared with concentrated hydrochloric acid, and add the newly configured hydrochloric acid solution dropwise to the beaker with a rubber dropper Stir while adding dropwise, continue magnetic stirring for 1 hour after the dropwise addition, let stand for 48 hours after the stirring is completed, perform suction filtration after the precipitation is complete, wash the obtained precipitate with distilled water for 5 times, and place it in a vacuum drying oven drying.

[0017] Step 1-2: Prepare concentrated hydrochloric acid as 60ml of 2mol / L hydrochloric acid solution, add dropwise the newly prepared hydrochloric acid solution to the dried precipitate, keep stirri...

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Abstract

The invention relates to a preparation method of a tungsten trioxide color-changing material. According to the invention, a tungsten trioxide color-changing material capable of changing color at normal temperature is prepared in the presence of hydrogen, and the leakage of hydrogen can be observed with eyes at normal temperature, thereby avoiding the danger caused by the leakage of hydrogen. WO3 is stable in chemical property and high in diffusion coefficient of oxygen vacancies, is a common gas sensitive material and is one of the most promising hydrogen sensitive materials in hydrogen sensitive sensors. The hydrogen sensitive material prepared in the invention has the advantages of being rapid in response and sensitive in color change and has great application prospects.

Description

technical field [0001] The present invention belongs to the field of materials. In particular, it relates to a preparation method of a tungsten trioxide color-changing material. Background technique [0002] Hydrogen energy is a renewable and clean energy and an effective way to ensure energy sustainability. On July 12, 2010, the world's first hydrogen energy power station was completed and put into operation in Italy, marking that the utilization of hydrogen energy has entered a substantive stage. Due to the excellent characteristics of hydrogen, it is also widely used in other fields, such as seismic monitoring, production of high-purity silicon wafers, production of hydrogen-containing chemical products, petroleum refining, metal welding, etc. However, hydrogen is a high-risk gas. Under normal temperature and pressure, if the hydrogen content in the air is between 4% and 74.5%, it is very likely to cause fires, explosions and other accidents, threatening personal and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02G01N21/78
CPCC01G41/02G01N21/783
Inventor 赵春山唐莹马雪娇孙依刘畅王晶李东平
Owner HARBIN UNIV OF SCI & TECH
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