Application of electrochemical oxygen sensor sensitive material

An oxygen sensor and sensitive material technology, applied in the field of electrochemical materials, can solve problems such as failure, false alarm, false alarm of oxygen sensor, etc., and achieve the effect of high specific area and suitable conductivity

Inactive Publication Date: 2017-10-24
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most sensitive materials will fail to work in acidic electrolyte for a long time, resulting in false alarms and false alarms of the oxygen sensor.
[0004] Noble metals are well known in the field of oxygen electrocatalysis, especially platinum-based electrocatalysts are widely used in oxygen gas diffusion electrode structures, and the commercialization of acidic electrolytes plays an extremely important role, but facing this corrosive environment , there are certain limitations in the stability of the sensor

Method used

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  • Application of electrochemical oxygen sensor sensitive material

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preparation example Construction

[0013] A preparation method for electrochemical oxygen sensor sensitive material, such as figure 1 shown, including the following steps,

[0014] Step 1. Take 250ml of noble metal precursor salt solution and 400mg of conductive carrier, disperse 400mg of conductive carrier into 250ml of noble metal precursor salt solution, keep stirring, and add 100mg of impregnation solution;

[0015] Step 2. Add 100 mg of impregnating solution to the mixed solution in step 1 under the condition of 15°C to 30°C. The concentration of the impregnating solution is 10 mg / m, and at the same time add alkaline solution to adjust the pH value of the solution to 10. ~11, obtaining the static solution of the loaded noble metal substance;

[0016] Step 3. Centrifuge the loaded noble metal substance static solution obtained in Step 2 at a speed of 4000rmp, wash with deionized water until the chlorine ion content is detected to be 0, and dry for 4 hours under vacuum conditions to obtain a dry powder , t...

Embodiment 1

[0027] Disperse 400mg of Cabot Corp Vulcan XC-72 activated carbon into 250mL of chloroplatinic acid, add 100mg of sodium borohydride under stirring, so that the concentration of sodium borohydride in deionized water is 10mg / mL. The temperature of the reaction system was controlled at room temperature. The pH value of the solution was adjusted to the range of 10-11 by ammonia water. Finally, the product was centrifuged, washed, and vacuum-dried for 4 hours to obtain the sensitive material. The average particle size is 20nm.

Embodiment 2

[0029] Disperse 400 mg of Cabot Corp Vulcan XC-72 activated carbon into 250 mL of ruthenium chloride solution, and add 100 mg of sodium borohydride under stirring to make the concentration of sodium borohydride in deionized water 10 mg / mL. The temperature of the reaction system was controlled at room temperature. The pH value of the solution was adjusted to the range of 10-11 by ammonia water. Finally, the product was centrifuged, washed, and vacuum-dried for 4 hours. The powder was evenly ground, placed on a watch glass, placed in a muffle furnace, and calcined at 300 degrees for 12 hours. That is, loaded ruthenium oxide is obtained. Grind and disperse the above materials to sensitive materials. Disperse into 250 mL of chloroplatinic acid, add 100 mg of sodium borohydride under stirring, so that the concentration of sodium borohydride in deionized water is 10 mg / mL. The temperature of the reaction system was controlled at room temperature. The pH value of the solution was...

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Abstract

The invention discloses an application of an electrochemical oxygen sensor sensitive material and belongs to the technical field of electrochemistry. The sensitive material comprises one or more precious metal sensitive materials supported on conductive carbon, an inorganic additive and one or more metal oxide additive adding parts, wherein an oxygen sensor comprises two or more electrodes contacted with an acidic electrolyte. The novel sensitive material combined in oxygen diffusion electrodes has higher activity and stability under the condition of the acidic electrolyte and can provide detection and alarm signals.

Description

[0001] This application is a divisional application for the preparation and application of sensitive materials for electrochemical oxygen sensors with application date 2015-9-22, application number 2015106094420, and title of invention technical field [0002] The invention belongs to the technical field of electrochemical materials, and in particular relates to the application of an electrochemical oxygen sensor material. Background technique [0003] The oxygen sensor based on the electrochemical principle has the advantages of high sensitivity and good selectivity, but the oxygen sensitive material determines the performance of the oxygen sensor. For example, in industrial and security alarms, it is necessary to improve the efficiency of oxygen reduction and shorten the corresponding time to oxygen. However, most sensitive materials will fail to work in acidic electrolyte for a long time, resulting in false alarms and false alarms of the oxygen sensor. [0004] Noble meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/30
Inventor 孙成勋陈涛朱宝余王鑫
Owner STATE GRID CORP OF CHINA
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