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Preparation method of graphene modified zirconium oxide powder for oxygen sensor

A technology of graphene modification and zirconia powder, which is applied in the direction of zirconia, graphene, chemical instruments and methods, etc., can solve the problems of general mechanical properties, restrict the development of oxygen sensors, and low conductivity, and achieve good mechanical properties, The effect of high electrical conductivity and high powder activity

Active Publication Date: 2019-04-09
SANXIANG ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sensitive element (oxygen sensor) is the key part of the oxygen sensor. At present, most oxygen sensors use 5-8mol% yttria-stabilized zirconia as the solid electrolyte. However, its electrical conductivity is low and its mechanical properties are general. Therefore, finding a new electrolyte material with higher conductivity, stronger mechanical properties and good anti-aging performance is the key to the development of high-performance oxygen sensors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A graphene-modified zirconia powder for an oxygen sensor and a preparation method thereof, the specific steps of which are:

[0017] (1) Weigh zirconium oxychloride and add deionized water to prepare an aqueous solution with a concentration of 1mol / L, heat to 70°C, and Y 2 o 3 Dissolved in zirconium oxychloride solution, the Y 2 o 3 The content is 5mol%, add 0.2 wt.% PEG dispersant, and add 0.2wt.% graphene oxide (industrial grade, thickness about 10nm);

[0018] (2) Slowly add thiourea under stirring, the mass fraction of thiourea in the total system is 5wt.%, slowly add ammonia water, precipitate into jelly, continue to add ammonia water, adjust the pH value of the slurry system to 8.5-9.5; Hydrolysis at 70°C for 12 hours;

[0019] (3) Put the obtained slurry into the reaction kettle, add 3wt.% mineralizer (the mineralizer is sodium hydroxide), and hydrothermally react at 150°C for 24h;

[0020] (4) Filter and wash the hydroheated slurry, first wash it with deion...

Embodiment 2

[0024] A graphene-modified zirconia powder for an oxygen sensor and a preparation method thereof, the specific steps of which are:

[0025] (1) Weigh zirconium oxychloride and add deionized water to prepare an aqueous solution with a concentration of 1mol / L, heat to 70°C, and Y 2 o 3 Dissolved in zirconium oxychloride solution, the Y 2 o 3 The content is 5mol%, add 0.2 wt.% PEG dispersant, and add 0.5wt.% graphene oxide (industrial grade, thickness about 10nm);

[0026] (2) Slowly add thiourea under stirring, the mass fraction of thiourea in the total system is 5wt.%, slowly add ammonia water, precipitate into jelly, continue to add ammonia water, adjust the pH value of the slurry system to 8.5-9.5; Hydrolysis at 70°C for 12 hours;

[0027] (3) Put the obtained slurry into the reaction kettle, add 5wt.% mineralizer (the mineralizer is sodium hydroxide), and conduct a hydrothermal reaction at 160°C for 24 hours;

[0028] (4) Filter and wash the hydroheated slurry, first wa...

Embodiment 3

[0032] A graphene-modified zirconia powder for an oxygen sensor and a preparation method thereof, the specific steps of which are:

[0033] (1) Weigh zirconium oxychloride and add deionized water to prepare an aqueous solution with a concentration of 1mol / L, heat to 70°C, and Y 2 o 3 Dissolved in zirconium oxychloride solution, the Y 2 o 3 The content is 8mol%, add 0.2 wt.% PEG dispersant, and add 0.3wt.% graphene oxide (industrial grade, thickness about 10nm);

[0034] (2) Slowly add thiourea under stirring, the mass fraction of thiourea in the total system is 5wt.%, slowly add ammonia water, precipitate into jelly, continue to add ammonia water, adjust the pH value of the slurry system to 8.5-9.5; Hydrolysis at 70°C for 12 hours;

[0035] (3) Put the obtained slurry into the reaction kettle, add 5wt.% mineralizer (the mineralizer is sodium hydroxide), and conduct a hydrothermal reaction at 150°C for 20 hours;

[0036] (4) Filter and wash the hydroheated slurry, first wa...

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Abstract

The invention discloses a preparation method of graphene modified zirconium oxide powder for an oxygen sensor and belongs to he technical field of production methods of oxygen sensors. The preparationmethod comprises the following specific steps: preparing a zirconium oxychloride water solution; dissolving Y2O3 into the zirconium oxychloride water solution; adding a PEG (Polyethylene Glycol) dispersant and graphene oxide; adding thiourea and adding ammonia water; hydrolyzing at 70 DEG C for 12h to obtain slurry; adding the slurry into a mineralizing agent and carrying out hydrothermal reaction; filtering and washing slurry subjected to the hydrothermal reaction; drying and calcining, and crushing through a vibration mill until the granularity is smaller than 200 meshes; adding a triethanolamine dispersant and grinding by adopting a sand mill; and spraying and drying to obtain the graphene modified zirconium oxide powder. The preparation method disclosed by the invention has the characteristics of low energy consumption, small agglomeration, small grain diameter, uniform granularity distribution, high powder activity and the like and is suitable for industrial batch production. Thegraphene modified zirconium oxide powder prepared by the method can be used for manufacturing a high-end oxygen sensor and a product has high electrical conductivity and good mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of production methods of oxygen sensors, and in particular relates to a preparation method of graphene-modified zirconia powder used in oxygen sensors. Background technique [0002] Zirconia oxygen sensors have high oxygen measurement accuracy and good high temperature stability, and are widely used in the fields of oxygen content detection in exhaust emissions of internal combustion engines. The sensitive element (oxygen sensor) is the key part of the oxygen sensor. At present, most oxygen sensors use 5-8 mol% yttria-stabilized zirconia as the solid electrolyte. However, its electrical conductivity is low and its mechanical properties are general. Therefore, finding a new electrolyte material with higher conductivity, stronger mechanical properties and good anti-aging performance is the key to the development of high-performance oxygen sensors. [0003] Graphene is a super-strong two-dimensional carbon mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C01B32/184G01N27/407
CPCC01B2204/04C01G25/02C01B32/184G01N27/4073
Inventor 胡天喜叶旦旺初薛基包晓刚高鸿魁刘印阁李小毅
Owner SANXIANG ADVANCED MATERIALS
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