Black phospho-TiO2 nanotube/Ti sensitive electrode hydrogen sulfide sensor

A hydrogen sulfide sensor and sensitive electrode technology, applied in nanotechnology, nanotechnology, material electrochemical variables, etc., can solve the problems of high cost, impact on application, easy poisoning of Pt, etc., achieve high anti-poisoning and anti-interference ability, good Selective, easy-to-operate effects

Active Publication Date: 2020-05-12
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN108872313A discloses a hydrogen sulfide gas sensor using Pt-Rh / C as a sensitive electrode, but its disadvantage is that precious metals Pt and Rh are used as catalysts, the cost is high, and Pt is easy to poison
Chinese patent CN105717168B discloses a noble metal hydrogen sulfide sensor based on titanium dioxide nanosheets, and Chinese patent CN106645309B discloses a Co-doped TiO 2 The hydrogen sulfide gas sensor of the nanotube array film, the Chinese patent CN108318542A discloses a tin dioxide-based gas sensor and a hydrogen sulfide gas sensor, which mainly measure the resistance by using the resistance change after the sensor absorbs the gas, but the ambient gas is complex , the sensor has poor selectivity to gas and poor anti-interference ability
In addition, some sensors use precious metal loads, which have high cost, and some semiconductor sensors have an operating temperature above 300 degrees Celsius, and the power consumption is large, which affects their application.

Method used

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  • Black phospho-TiO2 nanotube/Ti sensitive electrode hydrogen sulfide sensor
  • Black phospho-TiO2 nanotube/Ti sensitive electrode hydrogen sulfide sensor
  • Black phospho-TiO2 nanotube/Ti sensitive electrode hydrogen sulfide sensor

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Experimental program
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preparation example Construction

[0030] 2) TiO 2 Preparation of nanotubes / Ti: anodize the porous titanium tubes obtained through the pretreatment in step 1) in an electrolyte, the composition of the electrolyte: 0.5-1% HF, 1mol / L H 2 SO 4 The electrolysis potential is 20V, and the electrolysis time is 30-120min; after electrolysis, wash with deionized water, dry, and bake in a muffle furnace at 500°C for 3h, so that the inner and outer surfaces of the porous titanium tube generate TiO 2 nanotubes, to get TiO 2 Nanotube / Ti;

[0031] 3) Heat-treat red phosphorus at 200°C for 2 hours to remove oxides and impurities on the surface, and grind for 15 minutes after cooling;

[0032] 4) Black phosphorus-TiO 2 Preparation of Nanotube / Ti Sensitive Electrode: TiO 2 The nanotube / Ti is placed in a tube furnace, and the red phosphorus obtained in step 3) is placed on its inner and outer surfaces, at a rate of 5 cm per minute 3 Pass argon gas into the tube furnace at a high rate, raise the temperature to 600-1000°C, k...

Embodiment 1

[0043] (1) Pretreatment of the porous titanium tube: Ultrasonic degreasing in acetone for 15 minutes, then cleaning with methanol or ethanol; then use 400g / L CrO 3 and 350g / L of H 2 SO 4 Treat for 3 minutes, ultrasonically clean with double-distilled water for 3 times, treat with 1mol / L HF for 10 minutes, ultrasonically clean with double-distilled water for 3 times, and dry.

[0044] (2)TiO 2 Preparation of nanotubes / Ti: Anodize the porous titanium tubes obtained after the pretreatment in the electrolyte, the composition of the electrolyte: 0.8% HF, 1mol / L H 2 SO 4 ; The electrolysis potential is 20V, and the electrolysis time is 80min; after the electrolysis is completed, wash with deionized water, dry, and bake in a muffle furnace at 500°C for 3h to make the inner and outer surfaces of the porous titanium tube generate TiO 2 nanotubes, to get TiO 2 Nanotube / Ti.

[0045] (3) Heat-treat red phosphorus at 200°C for 2 hours to remove oxides and impurities on the surface, a...

Embodiment 2

[0050] (1) Pretreatment of the porous titanium tube: Ultrasonic degreasing in acetone for 15 minutes, then cleaning with methanol or ethanol; then use 400g / L CrO 3 and 350g / L of H 2 SO 4 Treat for 3 minutes, ultrasonically clean with double-distilled water for 3 times, treat with 1mol / L HF for 10 minutes, ultrasonically clean with double-distilled water for 3 times, and dry.

[0051] (2)TiO 2 Preparation of nanotubes / Ti: Anodize the porous titanium tubes obtained by the pretreatment in the electrolyte, the composition of the electrolyte: 0.8% HF, 1mol / L H 2 SO 4 ; The electrolysis potential is 20V, and the electrolysis time is 80min; after the electrolysis is completed, wash with deionized water, dry, and bake in a muffle furnace at 500°C for 3h to make the inner and outer surfaces of the porous titanium tube generate TiO 2 nanotubes, to get TiO 2 Nanotube / Ti;.

[0052] (3) Heat-treat red phosphorus at 200°C for 2 hours to remove oxides and impurities on the surface, and...

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Abstract

The invention discloses a hydrogen sulfide sensor with a black phospho-TiO2 nanotube / Ti sensitive electrode. The sensor comprises a sensor shell and a membrane electrode arranged in the sensor shell,an air chamber is arranged between the sensor shell and the membrane electrode, a gas reaction chamber is arranged in the membrane electrode, and the membrane electrode comprises a cathode diffusion layer, a cathode catalyst layer, a Nafion membrane and a black phospho-TiO2 nanotube / Ti sensitive electrode from outside to inside; the cathode diffusion layer is connected with the sensor shell through a welding point to form a cathode output end, the black phospho-TiO2 nanotube / Ti sensitive electrode is connected with the sensor shell through a welding point to form an anode output end, and a gasfiltering cap with diffusion holes is arranged at a top end of the gas reaction chamber to allow hydrogen sulfide gas to be detected to pass through; an air circulation hole cover communicated with the air chamber is arranged on the sensor shell, a water discharge hole is formed in the bottom of the air chamber, and an SO2 discharge hole is formed in the bottom of the black phospho-TiO2 nanotube / Ti sensitive electrode. The sensor provided by the invention has good selectivity on hydrogen sulfide gas and strong anti-poisoning and anti-interference capabilities.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a black phosphorus-TiO 2 Nanotube / Ti sensitive electrode hydrogen sulfide sensor. Background technique [0002] Hydrogen sulfide gas is an acidic gas under standard conditions. It is colorless and has the smell of rotten eggs at low concentrations. It is one of the main sources of odor in farms. Hydrogen sulfide is also produced in automobile exhaust and industrial waste gas. It is highly toxic and low Concentrated hydrogen sulfide has a strong stimulating effect on the mucous membrane, such as inhaling a small amount of high-concentration hydrogen sulfide can cause death, and hydrogen sulfide has a great impact on the health of humans and animals in the environment. It is essential to detect and monitor the concentration of hydrogen sulfide in farms or other environments in real time, and to deal with it in time. [0003] Hydrogen sulfide gas detection methods include silv...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N27/30G01N27/404B82Y40/00B82Y30/00B82Y15/00
CPCB82Y15/00B82Y30/00B82Y40/00G01N27/127G01N27/30G01N27/4045
Inventor 鞠剑峰鞠一逸章琴袁航于亚楠黄佩琳冯芸英
Owner NANTONG UNIVERSITY
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