A PD/W that improves the performance of hydrogen sensors 18 o 49 Preparation method of composite material

A technology of W18O49 and composite materials, applied in the field of preparation of Pd/W18O49 composite materials, can solve problems such as poor hydrogen response, and achieve the effects of low cost, abundant oxygen vacancies, and excellent gas sensing properties

Active Publication Date: 2019-12-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, WO 3 Sensor responds poorly to hydrogen at low temperatures

Method used

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  • A PD/W that improves the performance of hydrogen sensors <sub>18</sub> o <sub>49</sub> Preparation method of composite material
  • A PD/W that improves the performance of hydrogen sensors <sub>18</sub> o <sub>49</sub> Preparation method of composite material
  • A PD/W that improves the performance of hydrogen sensors <sub>18</sub> o <sub>49</sub> Preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Add 0.1g of tungsten hexachloride to 20mL of methanol solution under the condition of magnetic stirring, stir magnetically for 30min to obtain a uniform solution, and then put the uniform solution formed by them into a 25mL reaction kettle at 160°C Hydrothermal reaction 12h.

[0044] (2) The product obtained in step (1) is centrifuged, and the centrifuged product is first washed with ethanol for 3 times and then with deionized water for 3 times, and then put into a drying box for drying to obtain a sea urchin-like W 18 o 49 powder.

[0045] (3) Take 50 mg of dried sea urchin-shaped W 18 o 49 The powder was evenly dispersed in 100mL of deionized water, stirred magnetically for 30min to obtain a uniform solution, and then 3mL of 2.5mmol L -1 PdCl 2 The solution was stirred magnetically for 24h.

[0046] (4) The product obtained by ultrasonic stirring is washed, dried, and then annealed in air at 300°C for 2 hours to obtain the Pd / W 18 o 49 composite material. ...

Embodiment 2

[0056] (1) Add 0.08g of tungsten hexachloride to 20mL ethanol solution under the condition of magnetic stirring, and stir magnetically for 30min to obtain a uniform solution, and then put the uniform solution formed by them into a 25mL reaction kettle at 140°C Hydrothermal reaction 16h.

[0057] (2) The product obtained in step (1) is centrifuged, and the centrifuged product is first washed with ethanol for 3 times and then with deionized water for 3 times, and then put into a drying box for drying to obtain a sea urchin-like W 18 o 49 powder.

[0058] (3) Take 50 mg of dried sea urchin-shaped W 18 o 49 The powder was evenly dispersed in 100mL of deionized water, stirred magnetically for 30min to obtain a uniform solution, and then 3mL of 2.5mmol L -1 PdCl 2 The solution was stirred magnetically for 24h.

[0059] (4) The product obtained by ultrasonic stirring is washed, dried, and then annealed in air at 300°C for 2 hours to obtain the Pd / W 18 o 49 composite material...

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Abstract

The invention discloses a preparation method of a Pd / W18O49 composite material for improving performance of hydrogen sensors. The Pd / W18O49 composite material is a sea urchin shaped nanosphere which is combined from nanorods, the diameter of the sea urchin shaped nanosphere is 600-800nm, the diameter of the nanorod is 10-15nm, and precious metal palladium nanometer particles are attached to the surface of the nanorods. The sea urchin shaped W18O49 powder comprises a hierarchical structure which is composed of many nanorods, the specific surface area is very large, many active sites are provided for gas reaction, and at the same time the structure is good for adsorption and diffusion of gas; the surface of the sea urchin shaped W18O49 powder is modified with precious metal palladium nano particles which have higher activity for catalytic oxidation of hydrogen. Under combined action of these factors, excellent gas-sensitive characteristics are provided for the composite material.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor sensor materials, in particular to a Pd / W material for improving the performance of a hydrogen sensor 18 o 49 Methods of preparation of composite materials. Background technique [0002] As an efficient and clean energy source, hydrogen has the advantages of good combustion performance, fast ignition, and high calorific value, and the only product of hydrogen combustion is water, which will not cause any pollution to the environment, so hydrogen is considered to be one of the most important energy sources in the future one. In the past few decades, hydrogen has been widely used in petrochemical, metallurgy, medicine and many other fields. However, hydrogen is a colorless, odorless, flammable and explosive gas. During production, transportation and use, hydrogen leakage is very easy to occur and diffuses quickly, so it is difficult to be found. Therefore, it is necessary to us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李秋红周瑞林小萍潘茜王太宏
Owner XIAMEN UNIV
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