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Material for oxygen sensor, preparation method thereof and engine oxygen sensor

An oxygen sensor and engine technology, applied in the direction of analyzing materials, electrochemical variables of materials, and material analysis through electromagnetic means, can solve the problems of low production efficiency, high production cost, complicated process, etc., and achieve low cost, simple structure, The effect of improving sensitivity

Inactive Publication Date: 2006-05-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to make nano-materials for automobile exhaust sensor materials separately, and then make them into composite materials. The process is complicated, the production efficiency is low, and the production cost is high.

Method used

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  • Material for oxygen sensor, preparation method thereof and engine oxygen sensor
  • Material for oxygen sensor, preparation method thereof and engine oxygen sensor
  • Material for oxygen sensor, preparation method thereof and engine oxygen sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take a 200×30×2 (mm) pure titanium sheet, soak it in a 3% by weight hydrofluoric acid solution for 10 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0030] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 20% ​​by weight of sodium phosphate and 0.5% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 70°C, the oxidation voltage is 80V and stirring Electrochemical anodic oxidation was carried out for 15 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. The scanning electron microscope (SEM) photograph of obtained material is as figure 2 As shown, its transmission electron microscope (TEM) picture is shown in image 3 shown. From the transmission electron microscope photos, it can be seen that about 70% of the TiO on the surface of the film 2...

Embodiment 2

[0033] Take a 200×30×2 (mm) pure titanium sheet, soak it in a 5% by weight hydrofluoric acid solution for 6 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0034] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 25% by weight of sodium phosphate and 0.7% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 80°C, the oxidation voltage is 70V and stirring Electrochemical anodic oxidation was carried out for 10 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. From the transmission electron microscope photos, it can be seen that about 60% of the TiO on the surface of the film 2It is a crystalline state, and the average grain size of the film can be calculated as 22.75nm by using Scherrer's formula to calculate the grain size of the film. The content of Pt...

Embodiment 3

[0037] Take a 200×30×2 (mm) pure titanium sheet, soak it in 4% by weight hydrofluoric acid solution for 8 minutes to remove oxides on the surface of the titanium sheet, and then rinse it with distilled water.

[0038] With the above-mentioned treated titanium sheet as the anode, graphite as the cathode, and an aqueous solution containing 15% by weight of sodium phosphate and 0.5% by weight of platinum phosphate as the electrolyte, the temperature of the electrolyte is 80°C, the oxidation voltage is 85V and stirring Electrochemical anodic oxidation was carried out for 18 minutes under certain conditions to obtain the material for the engine oxygen sensor of the present invention. From the transmission electron microscope photos, it can be seen that about 60% of the TiO on the surface of the film 2 It is a crystalline state, and the average grain size of the film can be calculated as 17.67nm by using Scherrer's formula to calculate the grain size of the film. The content of Pt ...

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Abstract

The invention relates to a material for oxygen sensor, method for making the same and a motor oxygen sensor manufactured with the material. The material comprises titanium chip base and IiO2 thin film formed on the base surface with anodic oxidation process on home position. The processing method comprises following steps of: 1. processing the titanium chip base with 2-6% (weight percentage) acid solution to remove oxidate on the surface of titanium chip; 2. taking the processed titanium chip as anode, graphite as cathode, and taking 10-30% (weight percentage) sodium orthophosphate solution as base electrolytic solution to electrochemical oxidation on anode and form TiO2 thin film on the titanium chip surface. The motor oxygen sensor is characterized in that its materials comprises titanium chip base and IiO2 thin film formed on the base surface with anodic oxidation process on home position.

Description

technical field [0001] The invention relates to a material for an oxygen sensor, a preparation method thereof and an engine oxygen sensor made of the material. Background technique [0002] At present, the oxygen sensor materials used in automobiles to control exhaust emissions mainly include ZrO 2 and TiO 2 Both of them have the disadvantages of high temperature coefficient and poor stability. The semiconductor oxygen sensor has the characteristics of no gas reference electrode, small size, simple structure, low cost, and easy integrated production. It is more and more widely used in automobiles. As a material for semiconductor oxygen sensors, TiO 2 Has high oxygen-sensitivity properties, but studies have shown that catalyst-free TiO 2 The sensor has a series of deficiencies such as high operating temperature, long response time, and low sensitivity, so it must be used in TiO 2 A catalyst is added to adjust it. [0003] CeO for automotive oxygen sensor 2 -TiO 2 Comp...

Claims

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Application Information

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IPC IPC(8): G01N27/409G01N27/30
Inventor 肖美群
Owner BYD CO LTD
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