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CdO/SnO2 composite nanocube gas-sensitive material, preparation method and application of CdO/SnO2 composite nanocube gas-sensitive material in hydrogen detection

A nano-cube and bulk gas technology, which is applied to the analysis of materials, material resistance, chemical instruments and methods, etc., can solve the problems of hydrogen sensing performance not meeting the requirements of hydrogen detection, low sensitivity detection limit, and small volume of hydrogen molecules. Achieve the effect of fast response-recovery speed, easy synthesis conditions and low raw material cost

Pending Publication Date: 2022-03-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrogen is colorless, odorless, and difficult to detect, and the lower explosion limit of hydrogen in air is only 4%, and it only needs less than 0.02 millijoules of energy to ignite it
This means that once hydrogen leaks, it is very likely to cause a major safety accident
However, due to the small size of hydrogen molecules, there is a possibility of leakage at every stage of hydrogen production, storage, transportation and use. Early warning is extremely important
[0003] SnO 2 It is one of the classic gas-sensing materials, but its hydrogen sensing performance cannot meet the requirements of hydrogen detection

Method used

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  • CdO/SnO2 composite nanocube gas-sensitive material, preparation method and application of CdO/SnO2 composite nanocube gas-sensitive material in hydrogen detection
  • CdO/SnO2 composite nanocube gas-sensitive material, preparation method and application of CdO/SnO2 composite nanocube gas-sensitive material in hydrogen detection
  • CdO/SnO2 composite nanocube gas-sensitive material, preparation method and application of CdO/SnO2 composite nanocube gas-sensitive material in hydrogen detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: CdO / SnO with a molar ratio of 1:1 2 Preparation of composite nanocube gas-sensing materials.

[0033] (1) Weigh 4g sodium hydroxide (NaOH) and 5.3g sodium carbonate (NaOH) 2 CO 3 ), with a molar ratio of 2:1, dissolved in 100mL deionized water, configured so that the concentration of sodium hydroxide (NaOH) is 1mol / L, sodium carbonate (NaOH) 2 CO 3 ) concentration is 0.5mol / L mixed solution, as precipitating agent;

[0034] (2) Weigh 0.1461g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O) and 0.0951g cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O), the molar ratio is 1:1, dissolved in 50mL deionized water, configured as tin tetrachloride pentahydrate (SnCl 4 ·5H2 O) concentration is 0.0167mol / L, cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O) concentration is 0.0167mol / L mixed solution, stirred at room temperature until uniform;

[0035] (3) Slowly add the precipitating agent configured in step (1) dropwise to the solution configured in step (2), sto...

Embodiment 2

[0038] Example 2: CdO / SnO with a molar ratio of 2:1 2 Preparation of composite nanocube gas-sensing materials.

[0039] (1) Weigh 4g sodium hydroxide (NaOH) and 5.3g sodium carbonate (NaOH) 2 CO 3 ), with a molar ratio of 2:1, dissolved in 100mL deionized water, configured so that the concentration of sodium hydroxide (NaOH) is 1mol / L, sodium carbonate (NaOH) 2 CO 3 ) concentration is 0.5mol / L mixed solution, as precipitating agent;

[0040] (2) Weigh 0.1268g cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O) and 0.0974g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O), the molar ratio is 2:1, is dissolved in 50mL deionized water, configures tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O) concentration is 0.0056mol / L, cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O) the concentration is 0.0111mol / L mixed solution, stirred at room temperature until uniform;

[0041] (3) Slowly add the precipitating agent configured in step (1) dropwise to the solution configured in step (2...

Embodiment 3

[0044] Example 3: CdO / SnO with a molar ratio of 1:2 2 Preparation of composite nanocube gas-sensing materials.

[0045] (1) Weigh 4g sodium hydroxide (NaOH) and 5.3g sodium carbonate (NaOH) 2 CO 3 ), with a molar ratio of 2:1, dissolved in 100mL deionized water, configured so that the concentration of sodium hydroxide (NaOH) is 1mol / L, sodium carbonate (NaOH) 2 CO 3 ) concentration is 0.5mol / L mixed solution, as precipitating agent;

[0046] (2) Weigh 0.0634g cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O) and 0.1948g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O), the molar ratio is 1:2, dissolved in 50mL deionized water, configured as tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O) concentration is 0.0111mol / L, cadmium chloride 2.5 hydrate (CdCl 2 2.5H 2 O) the concentration is 0.0056mol / L mixed solution, stirred at room temperature until uniform;

[0047] (3) Slowly add the precipitating agent configured in step (1) dropwise to the solution configured in step (2...

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Abstract

The invention discloses a CdO / SnO2 composite nanocube gas-sensitive material, a preparation method and application of the CdO / SnO2 composite nanocube gas-sensitive material in hydrogen detection, and belongs to the technical field of gas-sensitive materials. According to the invention, stannic chloride hydrate and cadmium dichloride hydrate are taken as raw materials, a mixed solution of sodium hydroxide and sodium carbonate is taken as a precipitator, and a series of CdO / SnO2 composite nanocube gas-sensitive materials with different molar ratios are prepared by adopting a coprecipitation synthesis method. The gas sensor prepared from the CdO / SnO2 composite nanocube gas-sensitive material with the molar ratio of 1: 1 shows excellent hydrogen detection performance. At a low working temperature (220 DEG C), the hydrogen response has the advantages of high sensitivity, high selectivity, extremely short response-recovery time and the like, which is very beneficial to early warning of hydrogen leakage. The preparation method of the gas sensitive material is simple in preparation condition, short in synthesis period, low in raw material cost and easy to realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials, in particular to a CdO / SnO 2 Composite nano-cube gas-sensing material, preparation method and application in hydrogen detection. Background technique [0002] As a clean energy carrier, hydrogen is widely used in hydrogen fuel cells, new energy vehicles, petrochemical, metallurgical industry, aerospace, food processing and electronics industries. The rapid development of green hydrogen energy also contributes to the accelerated realization of "carbon peak" and "carbon neutrality". However, hydrogen is colorless, odorless, and difficult to detect, and the lower explosion limit of hydrogen in air is only 4%, and it only needs less than 0.02 millijoules of energy to ignite it. This means that once hydrogen leaks, it is very likely to cause a major safety accident. However, due to the small size of hydrogen molecules, there is a possibility of leakage at every stage of hydrogen pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G11/00C01G19/02G01N27/12
CPCC01G11/00C01G19/02G01N27/127C01P2002/72C01P2004/03C01P2004/64C01P2004/80
Inventor 李国栋田欣华邹晓新
Owner JILIN UNIV