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PbO2 electrode with long service life and high catalytic activity

A lead dioxide and electrode technology, which is applied in chemical instruments and methods, electrolytic inorganic material coating, water/sludge/sewage treatment, etc., can solve the problem of reducing the electrochemical stability and service life of electrodes, coating shedding, and substrate passivation And other problems, to achieve the effect of improving life, stable performance and low cost

Active Publication Date: 2018-06-29
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as PbO 2 There is a large internal stress inside the coating, and the nascent oxygen generated during the electrolysis process can easily diffuse through the surface layer to the substrate, which will passivate the substrate, peel off the coating, and reduce the electrochemical stability and service life of the electrode.

Method used

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  • PbO2 electrode with long service life and high catalytic activity
  • PbO2 electrode with long service life and high catalytic activity
  • PbO2 electrode with long service life and high catalytic activity

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The titanium mesh was ultrasonically cleaned with acetone, ethanol, and deionized water for 15 minutes, and then air-dried naturally after taking it out. Then Ti / SnO was prepared on the surface of titanium mesh by coating thermal decomposition 2 -Sb bottom layer, the composition of the coating solution used is 5ml of n-butanol, 3ml of concentrated hydrochloric acid, 3g of tin tetrachloride, and 0.3g of antimony trichloride. When the coating solution is completely dissolved into a uniform and transparent state, dip the coating solution with a brush and apply it on the titanium mesh. Then place it in an electric constant temperature drying oven and dry it at 120°C for 15 minutes, then take it out and paint it again. After repeating this for 8 times, it was fired in a muffle furnace at 500°C for 2 hours.

[0028] Continue to deposit a layer of α-PbO on the surface of the electrode by electrodeposition 2 middle layer. The electrodeposition solution used is 0.1mol / L of P...

Embodiment 2

[0037] Similar to Example 1, the same method is adopted to obtain a layer coated with bottom layer and α-PbO 2 The electrode in the middle layer, and then obtain β-PbO on the surface of the electrode by electrochemical deposition 2Surface active layer, the electrodeposition solution used is 0.5mol / L Pb(NO 3 ) 2 , 0.05mol / L HBO 3 , 0.1g / LNaF, 50mg / L graphene oxide (GO), 20mg / L nano-SiC; the current density used is 20mA / cm 2 . The temperature is 60°C, and electrodeposition is performed for 1 hour, and a new type of lead dioxide composite electrode can be obtained.

[0038] The surface morphology and catalytic performance of the electrode were analyzed and characterized by scanning electron microscope (SEM) and ultraviolet spectrophotometer. Such as Figure 4 As shown, it can be seen that the β-PbO on the surface of the composite electrode doped with nano-silicon carbide and graphene oxide obtained by electrodeposition 2 The particles are uniform and dense, and the particl...

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Abstract

A PbO2 electrode with long service life and high catalytic activity is prepared with SnO2-Sb2O3 as a base layer, alpha-PbO2 as a medium layer, and beta-PbO2 as a surface active layer. The PbO2 in theinvention is compact and uniform and has small particles and large specific surface area; meanwhile, the surface active layer has excellent adhesion force and is not liable to fall off; the surface ofthe PbO2 electrode is smooth and firm and is anti-acid / alkali-corrosion, has high catalytic activity and long service life. In addition, a preparation method is simple in conditions and low in cost;the product has stable performance and is suitable for industrial production, can be widely applied to the field of sewage treatment with electrically catalytic oxidization, and has extensive market prospect.

Description

technical field [0001] The invention relates to a lead dioxide electrode, which can be used as an anode for electrocatalytic sewage treatment. Background technique [0002] Sewage treatment has always been a research hotspot. With the development of industrial technology, the amount of polluted wastewater discharged by industry is also increasing day by day, which makes the already relatively scarce water resources more tense. Most of these pollutants are organic pollutants, and when they are discharged into water, they will cause damage to the ecological environment. Among many sewage treatment technologies, the electrocatalytic oxidation method has low equipment requirements, fast processing speed, simple operation, clean and pollution-free, and is easy to apply on a large scale. It is an environmentally friendly technology. It has been widely concerned in recent years and is an important development direction in the field of sewage treatment in the future. The properti...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/467C25D9/04
CPCC02F1/46109C02F1/4672C02F2001/46142C02F2201/46105C25D9/04
Inventor 黎学明满帅帅包河彬杨海峰曾韬陈金熊林利罗晓玉
Owner CHONGQING UNIV
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