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Ag/Ag2O-modified SnO2 porous composite and application of Ag/Ag2O-modified SnO2 porous composite to hydrogen detection

A porous composite material, hydrogen technology, applied in the field of gas sensing, can solve the problems of complex preparation process, high working temperature and high preparation cost

Active Publication Date: 2016-01-06
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang et al. (Journal of materials science letters, 1994, volume 13, pages 1048-1050) passed in SnO 2 Vacuum silver plating on the film can improve the sensitivity and selectivity of the material for hydrogen detection, but its working temperature is high, and the preparation process is complicated and the preparation cost is high

Method used

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  • Ag/Ag2O-modified SnO2 porous composite and application of Ag/Ag2O-modified SnO2 porous composite to hydrogen detection
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  • Ag/Ag2O-modified SnO2 porous composite and application of Ag/Ag2O-modified SnO2 porous composite to hydrogen detection

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Experimental program
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Effect test

Embodiment 1

[0016] 1) SnO 2 Preparation of the precursor: 0.35g of SnCl 4 ·5H 2 O was dissolved in 8 mL of glycerol and 30 mL of isopropanol solvent, transferred to a reaction kettle, reacted at 180 °C for 12 h, cooled naturally to room temperature, and centrifuged to obtain SnO 2 Precursor.

[0017] 2) Ag / Ag 2 O modified porous SnO 2 Preparation of composite materials: 100mg of SnO 2 precursor and 5 mg of AgNO 3 Stir in 2 mL of ethanol for 15 minutes, dry at 80°C for 1 hour, and calcine at 300°C in air for 2 hours to obtain Ag / Ag 2 O-modified SnO 2 Porous microsphere materials (such as figure 1 ). The structure and composition of the above samples were studied, figure 2 is Ag / Ag 2 O-modified SnO 2 The XRD spectrum of the porous microsphere material, the peak position of the diffraction peak is consistent with PDF#41-1445 (source: International Center for Diffraction ICDD), because the content of silver in the product is less, and Ag and Ag 2 The main diffraction peaks of O ...

Embodiment 2

[0021] Same as Example 1, but AgNO 3 The dosage was changed to 2mg. The response value of the composite material to 200ppm hydrogen is 10, the response time is 3s, and the recovery time is 30s. It has no response to the concentration of 200ppm carbon monoxide and methane. The detection limit of hydrogen is 1000ppb.

Embodiment 3

[0023] Same as Example 1, but AgNO 3 The dosage was changed to 8mg. The response value of the composite material to 200ppm hydrogen is 22, the response time is 4s, and the recovery time is 35s. It has no response to the concentration of 200ppm carbon monoxide and methane. The detection limit of hydrogen is 500ppb.

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Abstract

The invention discloses an Ag / Ag2O-modified SnO2 porous composite and application of the Ag / Ag2O-modified SnO2 porous composite to selective and rapid detection on a trace of hydrogen, and belongs to the technical field of gas sensing. By means of the gas-sensitive composite, a trace of hydrogen in air can be rapidly and accurately detected, the working temperature of the composite is obviously lower than that of traditional gas-sensitive materials, the service life of devices can be easily prolonged, reliability of data can be easily improved, and the requirements for energy conservation and environment protection are met. The SnO2 porous composite is used for manufacturing sensing devices used for selectively detecting a trace of hydrogen, and after the devices age for 8-24 hours at the temperature of 170 DEG C to 280 DEG C, the response value of the devices for hydrogen of 200 ppm is between 10 and 40, the response time is 2 s to 4 s, the recovery time is 28 s to 100 s, and the devices have no response to carbon monoxide or methane.

Description

technical field [0001] The invention belongs to the technical field of gas sensing, in particular to an Ag / Ag 2 O-modified SnO 2 Porous composite material, and its application in the selective and rapid detection of trace hydrogen gas. Background technique [0002] Hydrogen energy is sustainable and non-polluting, and it is currently one of the clean energy sources with the most potential to replace traditional fossil energy sources. Moreover, hydrogen also has very important applications in petrochemical and other fields, and is widely used in oil refining, synthesis of ammonia and methanol, biological fields, aerospace, fuel cells and automobile industries. However, hydrogen is an extremely flammable and explosive gas, and its explosion limit in air is 4% to 75% (volume ratio, the upper limit reaches 75%). As a small molecule gas, hydrogen is composed of the smallest hydrogen atoms, has high diffusion and permeability, and is easily leaked during transportation, storage...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 李国栋李慧慧赫奕
Owner JILIN UNIV
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