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NASICON-based H2S sensor using composite metallic oxide as sensitive electrode

A technology of sensitive electrodes and composite metals, applied in the direction of electrochemical variables of materials, etc., can solve the problem of large sensor size, achieve the effect of simple preparation process, good electrical conductivity and chemical stability, and promote practicality

Active Publication Date: 2013-01-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The EMF value of the sensor and the H 2 The logarithm of S concentration has a good linear relationship, and its sensitivity (slope) is -74mV / decade. In addition, the performance of the sensor is not affected by CO 2 and water effects, but the size of this sensor is relatively large

Method used

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  • NASICON-based H2S sensor using composite metallic oxide as sensitive electrode
  • NASICON-based H2S sensor using composite metallic oxide as sensitive electrode
  • NASICON-based H2S sensor using composite metallic oxide as sensitive electrode

Examples

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Embodiment 1

[0054] CoCr 0.2 mn 1.8 o 4 As a sensitive electrode material, making H 2 S sensor, its fabrication process is

[0055] 1. With Cr(NO 3 ) 3 , Co(NO 3 ) 2 and Mn(NO 3 ) 3 Weigh the raw material according to the molar ratio of 0.2:1:1.8, dissolve it in 20ml of deionized water, add 15ml of concentrated nitric acid with a mass fraction of 65% and 80ml of ethylene glycol, react in a water bath at 80°C for 20 hours, and then heat to 100 ℃ for 3 hours to turn the sol into a gel, and then put it in a temperature condition of 160 ℃ for 20 hours to make it into a xerogel, and finally sintered in a muffle furnace at 800 ℃ for 8 hours to obtain CoCr 0.2 mn 1.8 o 4 Sensitive electrode materials;

[0056] 2. Preparation of NASICON powder by sol-gel method, coated on an insulating ceramic tube and sintered to form the ion-conducting layer of the sensor, with a thickness of 0.2 mm.

[0057] 3. Make gold electrodes. On the surface of the NASICON ion-conducting layer close to the e...

Embodiment 2

[0066] CoCr 0.6 mn 1.4 o 4 As a sensitive electrode material, making H 2 S sensor, its production process is based on Cr(NO 3 ) 3 , Co(NO 3 ) 2 and Mn(NO 3 ) 3 Prepare a solution for the raw material according to the molar ratio of 0.6:1:1.4. The specific preparation process is as described above to obtain CoCr 0.6 mn 1.4 o 4 . The fabrication process of the device is the same as above.

[0067] Table 2 lists the CoCr 2 o 4 and CoCr 0.6 mn 1.4 o 4 For sensitive material devices at different concentrations of H 2 The difference between the electromotive force in S atmosphere and the electromotive force in air (ΔEMF) varies with H 2 The change value of S concentration can be seen from the table by using CoCr 0.6 mn 1.4 o 4 As a sensitive electrode, the sensitivity of the sensor is further improved. And comparing Table 1 and Table 2, it can be seen that using CoCr 0.2 mn 1.8 o 4 The EMF change of the device is higher than that using CoCr 0.2 mn 1.8 o 4...

Embodiment 3

[0071] CoCr 1.2 mn 0.8 o 4 As a sensitive electrode material, making H 2 S sensor, its production process is based on Cr(NO 3 ) 3 , Co(NO 3 ) 2 and Mn(NO 3 ) 3 Prepare a solution for the raw material at a molar ratio of 1.2:1:0.8, and the specific preparation process is as described above. The fabrication process of the device is the same as above.

[0072] Table 2 lists the CoCr 2 o 4 and CoCr 0.8 mn 1.2 o 4 For sensitive material devices at different concentrations of H 2 The difference between the electromotive force in S atmosphere and the electromotive force in air (ΔEMF) varies with H 2 The change value of S concentration can be seen from the table by using CoCr 0.6 mn 1.4 o 4 As a sensitive electrode, the sensitivity of the sensor is further improved. And comparing Table 1, Table 2 and Table 3, it can be seen that the use of CoCr in the four devices 0.2 mn 1.8 o 4 The electromotive force change of the device as the sensitive electrode is more impro...

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Abstract

The invention belongs to the field of gas sensors, and particularly relates to a NASICON-based mixed-potential type H2S sensor with a novel composite metallic oxide sensitive electrode. The NASICON-based mixed-potential type H2S sensor can be used for detecting poisoned gas in the atmospheric environment and consists of a nickel-cadmium alloy heater, an Al3O3 ceramic tube used as an insulating layer, an NASICON ion conductive layer, an Au reference electrode and the sensitive electrode consisting of Au and metallic oxide electrodes. Cobalt chromate doped with manganese is used as the sensitive electrode for the first time, the catalytic activity of the cobalt chromate in electrochemical reaction is increased owning to the manganese, the efficiency of electrode reaction at a three-phase boundary is improved, electron transfer rate is effectively increased, electrochemical reaction rate is greatly increased, and the purpose of increasing sensitivity is achieved. The sensitivity of the sensor using CoCr1.2Mn0.8O4 as the sensitive electrode is far higher than that of a sensor using CoCr2O4 without manganese as a sensitive electrode.

Description

technical field [0001] The invention belongs to the field of gas sensors, in particular to a NASICON-based mixed potential type H sensor with a novel composite oxide sensitive electrode. 2 S sensor, which can be used for the detection of toxic gases in the atmospheric environment. Background technique [0002] Hydrogen sulfide is a flammable, colorless, irritating, asphyxiating gas. Inhalation of excessive H 2 S, has great harm to people and animals. The main sources of hydrogen sulfide pollution in the atmosphere are man-made fibers, natural gas purification, sulfur dyes, petroleum refining, gas production, sewage treatment, papermaking and other production processes and organic matter corruption processes. H 2 It is very important to quickly, timely, and accurately check and monitor the concentration of S, so it is necessary to develop a hydrogen sulfide sensor with high sensitivity, good selectivity, and fast response recovery. [0003] At present, the main methods for...

Claims

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Application Information

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IPC IPC(8): G01N27/27
Inventor 梁喜双张含卢革宇
Owner JILIN UNIV
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