Method for preparing lead dioxide electrode with porous matrix

A lead dioxide, porous substrate technology, applied in chemical instruments and methods, electrodes, electrolysis processes, etc., can solve the problem of reducing the service life and use effect of electrodes, weakening the adhesion strength of the lead dioxide active layer, and destroying the protection of the intermediate layer on the substrate. function and other problems, to achieve the effects of good economy, high anti-peeling ability and high stability

Inactive Publication Date: 2016-08-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These phenomena will not only destroy the protective effect of the intermediate layer on the substrate, but also weaken the adhesion strength of the lead dioxide active layer on the substrate surface, reducing the service life and use effect of the electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Select a flat porous nickel substrate with a thickness of 2 mm (average pore diameter 5.1 μm, porosity 46%), cut the size to meet the requirements (50 mm × 45 mm), and polish it to remove burrs. It was placed in acetone for ultrasonic degreasing for 5 min, washed with deionized water and dried. Coat the coating solution evenly on the surface of the pretreated porous nickel substrate, dry it at 300°C, repeat 6 times, and finally place it in a vacuum sintering furnace or in a protective atmosphere for heat treatment at high temperature (850°C) for 1 hour, then cool down naturally for backup use. A porous nickel substrate with an intermediate coating is used as the anode, and a nickel sheet of the same size is used as the cathode. At pH 2, the current density is 30mA / cm 2 , and the temperature was kept at 55°C for 30 minutes to obtain porous nickel-based β-PbO 2 electrode, where β-PbO 2 The thickness of the active layer was 1.1 μm. The oxygen evolution potential was me...

Embodiment 2

[0017] First, a circular tubular porous titanium substrate with a thickness of 1 mm (average pore diameter 4.5 μm, porosity 50%) is selected. After grinding the surface with sandpaper, cut it into shape (20mm×25mm) and place it in acetone for ultrasonic degreasing for 5 minutes, wash it with water, etch it with 10wt% hydrochloric acid solution at 65°C for 30 minutes, wash it with deionized water until neutral, and then dry it. The coating solution was uniformly coated on the surface of the pretreated porous titanium substrate, dried at 200°C, repeated 6 times, and finally placed in a muffle furnace for heat treatment at 480°C for 1 hour, and then cooled naturally for later use. The porous titanium substrate with a mud-crack-free intermediate coating is used as the anode, and the outer copper tube is used as the cathode (the distance between electrodes is 10mm). At pH 1, the current density is 30mA / cm 2 , and the temperature was kept at 55°C for 30 minutes to obtain porous tita...

Embodiment 3

[0020] Firstly, a plate-shaped porous ceramic substrate with a thickness of 1 mm is selected, with an average pore diameter of 10 μm and a porosity of 45%. It was cut into shape (20mm×50mm) and placed in acetone for ultrasonic degreasing for 5min, washed with water and etched with 5wt% sodium hydroxide solution at 65°C for 30min, washed with deionized water until neutral and then dried. Soak the pretreated porous ceramic substrate in the coating solution, take it out and dry it at 250°C for 10 minutes, and finally place it in a muffle furnace for heat treatment at 450°C for 30 minutes, repeating 10 times. β-PbO 2 Powder (average pore size 2 electrode.

[0021] The formulation of the coating solution in this embodiment is a solution of n-butanol-concentrated hydrochloric acid (volume ratio 4:1) with a mass ratio of tin tetrachloride pentahydrate and antimony trichloride at a mass ratio of 15:5 and a total mass fraction of 25%.

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Abstract

The invention relates to a method for preparing a lead dioxide electrode with a porous matrix. The method includes the following steps that a porous material serves as the matrix, the matrix is subjected to surface treatment, and a mud-crack-free middle coating and a lead dioxide surface layer are prepared on the treated surface of the matrix sequentially. The method has the beneficial effects that the lead dioxide electrode with the porous matrix is of a unique three-dimensional internal structure, and the middle layer can be closely combined with the porous matrix as a solid solution or in other forms, and forms a compact mud-crack-free covering layer, so that the matrix is effectively protected, and the service life of the electrode is greatly prolonged; an active layer and the matrix can be firmly combined, and high bonding force and high anti-stripping capacity are achieved; the special internal meshed communication mechanism of the porous matrix material improves the overall performance of the electrode and plays a significant role in assisting in electrocatalytic oxidation; and the prepared lead dioxide electrode with the porous matrix has the advantages of high oxygen evolution potential, good catalytic activity, large electrode specific surface area, and small interface resistance and internal stress.

Description

technical field [0001] The invention relates to a method for preparing a porous matrix lead dioxide electrode. Background technique [0002] Lead dioxide has good conductivity, and has the advantages of high oxygen evolution overpotential and strong corrosion resistance when electrolyzed in aqueous solution, so it is widely used in electrolysis processes such as chemical production, water treatment and cathodic protection. However, the lead dioxide material is hard and fragile, and it is difficult to machine. In order to facilitate the preparation and use of electrodes, it is often deposited on other substrates (such as non-metals such as graphite and ceramics, and metal materials such as platinum and titanium). However, the microscopic grains of lead dioxide are coarse, and the gaps between the grains are difficult to block the penetration of oxygen, so the matrix cannot be fully shielded and protected. Especially when the metal matrix material encounters oxygen, its surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25D9/06C23C24/00C23C28/04C02F1/461
CPCC02F1/46109C02F2001/46142C23C24/00C23C28/04C25D9/06C25B11/051C25B11/091
Inventor 王岚卢鹏王龙耀陈群
Owner CHANGZHOU UNIV
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