A kind of oxygen sensor internal electrode platinum paste and its preparation method and application

An oxygen sensor and internal electrode technology, which is applied in the field of platinum slurry for the internal electrode of the oxygen sensor and its preparation, can solve the problems of high cost and high platinum consumption of the oxygen sensor

Inactive Publication Date: 2015-11-25
惠州市富济电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned technical defects, the technical problem to be solved in the present invention is that the consumption of platinum is high and the cost of the oxygen sensor is high without reducing the performance of the oxygen sensor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take a suitable zirconia powder, preferably 6-8YSZ, with a particle size range of 10-100 microns, preferably 50-80 microns; sensitize the surface of the zirconia powder, and the ratio of the sensitization solution is H 2 O100ml, SnCl 2 20g, Sn powder 10g, concentrated hydrochloric acid 20ml, add zirconia powder into the sensitization solution and mechanically stir for 30min, filter and transfer to deionized water to wash 3 times, then add PdCl 2 Activated in PdCl 2 The formula of the activation solution is H 2 O100ml, PdCl 2 2g, 20ml of concentrated hydrochloric acid, formed Pd nanoparticles on the surface of zirconia powder through the sensitization and activation steps for the electroless platinum plating catalyst in the next step.

[0017] The above-mentioned treated zirconia is dropped into the platinum plating solution, and the plating solution of platinum is prepared as follows, chloroplatinic acid 2g, H 2 O200ml, 2ml of 85% hydrazine hydrate. Heat it in a wa...

Embodiment 2

[0020] Compared with Example 1, the difference is: platinum-coated zirconium powder 91.2g, organic solvent 18.8g, organic adhesive 10g, described organic solvent is turpentine, ethanol, propanol, terpineol, succinic acid two At least one of methyl ester, butyl acetate, ethyl acetate, cyclohexanone, butanone; the organic binder is butyl cellulose, acrylic resin, epoxy resin, polyurethane resin, polyvinylpyrrolidone, At least one of polypropylene butyral.

Embodiment 3

[0022] Compared with Example 2, the difference lies in: 92.4g of platinum-coated zirconium powder, 17.6g of organic solvent, and 10g of organic binder.

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Abstract

The invention relates to the field of chemical slurry material, and specifically relates to oxygen sensor inner electrode platinum slurry, and a preparation method and an application thereof. The oxygen sensor inner electrode platinum slurry is composed of, by weight: 71-79% of platinum-coated zirconium powder, 14.7-16.7% of an organic solvent, and 6.3-8.3% of an organic adhesive. The preparation method comprises the steps that: the platinum-coated zirconium powder, the organic solvent, and the organic adhesive are added into a flask according to the ratio; and heating and stirring is carried out, such that cellulose is dissolved and the platinum-coated zirconium powder is uniformly mixed into a platinum slurry, wherein a heating temperature is 75-85 DEG C. The sensor manufactured by using the platinum slurry has stable electrical properties. Especially, a maximum voltage of the sensor can be 0.98V. Response speed is fast.

Description

technical field [0001] The invention relates to the field of chemical slurry materials, in particular to a platinum slurry for an inner electrode of an oxygen sensor and a preparation method and application thereof. Background technique [0002] Today's oxygen sensor is used in the exhaust pipe of automobiles to detect the concentration of oxygen in the exhaust gas, so as to judge whether the fuel is rich or lean, and then the ECU controls the amount of fuel injection to achieve the purpose of saving fuel. Regardless of whether it is a tube-type sensor or a chip-type sensor, the catalytic electrode is mainly composed of the precious metal platinum. Although the amount of platinum is small, it accounts for most of the cost of the sensor. Therefore, all manufacturers are thinking about reducing the amount of platinum. For example, the electrode pattern is shown in Fig. 1 of CN101532985, the electrode projection is T-shaped, and the amount of platinum is less, but the electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/403
Inventor 段水亮徐斌张文振王田军
Owner 惠州市富济电子材料有限公司
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