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Preparation method of titanium-based titanium dioxide nanotube stannic oxide electrode

A technology of titanium dioxide and tin dioxide, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of easy cracks on the coating surface, low service life of electrodes, and poor stability etc. to achieve the effects of low cost, improved electrocatalytic performance, and increased catalytic activity

Active Publication Date: 2010-10-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, there are a series of problems in the preparation of titanium-based SnO2 electrodes by traditional methods: first, cracks are prone to appear on the surface of the SnO2 coating, which is easy to cause passivation of the titanium substrate, and its stability is not good, and it is easy to fall off; secondly, SnO2 is a semiconductor, and the normal temperature resistance very big
This shows that the titanium-based tin dioxide electrode prepared by the traditional brush coating thermal decomposition method has the defects of low electrode service life and easy deactivation of the electrode.

Method used

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  • Preparation method of titanium-based titanium dioxide nanotube stannic oxide electrode
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  • Preparation method of titanium-based titanium dioxide nanotube stannic oxide electrode

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preparation example Construction

[0015] The preparation method of the titanium-based titanium dioxide nanotube tin dioxide electrode of the present invention adopts anodic oxidation, electrodeposition and thermal oxidation to prepare the titanium-based titanium dioxide nanotube tin dioxide electrode, specifically comprising the following steps:

[0016] The first step: prepare titanium dioxide nanotubes on the titanium substrate by anodic oxidation method:

[0017] The surface of the titanium sheet is polished smooth, cleaned and used as the anode, with stainless steel as the cathode, the DC voltage is controlled at 20-25V, and anodic oxidation is performed in the electrolyte of potassium fluoride, hydrogen fluoride and sulfuric acid, and the electrolyte is 0.07-0.08mol / Mixed solution of L potassium fluoride, 0.07~0.08mol / L hydrogen fluoride and 0.95~1.05mol / L sulfuric acid, the anodizing time is 40~70min, take out the anodized titanium substrate, rinse it, heat and roast after air drying, The heating and ca...

Embodiment 1

[0022] Cut the titanium plate into a size of 1.0cm×3.0cm, polish the titanium surface with sandpaper until the metal luster, remove the oil on the surface of the titanium substrate, and then heat it in 18wt% HCl solution for 15min to remove the oxide layer, rinse with distilled water and place Reserve in distilled water. The treated titanium plate is used as the anode, and the stainless steel plate of the same size is used as the cathode. The electrolyte is a mixed solution of 0.07mol / L potassium fluoride, 0.08mol / L hydrogen fluoride and 0.95mol / L sulfuric acid, and the distance between the electrodes is controlled to be 1cm. The voltage is 20V, after anodizing for 60min, the sample is taken out, rinsed with deionized water, air-dried naturally, placed in a muffle furnace, heated to 500°C with a temperature program of 1°C / min, and then roasted for 3 hours to obtain titanium-based titanium dioxide nanoparticles Tube. The titanium matrix prepared with titanium dioxide nanotubes...

Embodiment 2

[0030]The pretreatment steps of the titanium plate are the same as those in Example 1. The treated titanium plate is used as the anode, and the stainless steel plate of the same size is used as the cathode. The electrolyte is a mixed solution of 0.08mol / L potassium fluoride, 0.07mol / L hydrogen fluoride and 1.05mol / L sulfuric acid, and the distance between the electrodes is controlled to be 1cm. The voltage was 25V, anodized for 40min, rinsed with deionized water, air-dried naturally, placed in a muffle furnace, heated to 550°C with a temperature program of 2°C / min, and then calcined for 3 hours to prepare titanium-based titanium dioxide nanotubes. The titanium substrate prepared with titanium dioxide nanotubes was used as the cathode, and the stainless steel of the same size was used as the anode, and the current density was controlled at 4mA / cm 2 , first electrodeposit antimony in a mixed solution of 0.015mol / L antimony trichloride and 0.1mol / L citric acid for 0.5min, then el...

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Abstract

The invention relates to a preparation method of a titanium-based titanium dioxide nanotube stannic oxide electrode, belonging to the technical field of electro-catalysis electrode preparation. The method comprises the following steps: firstly adopting an anodic oxidation method to prepare a titanium dioxide nanotube on a titanium matrix, thus improving the specific surface area of the titanium matrix; and depositing stibium and tin in the titanium dioxide nanotube by an electro-deposition method successively, and performing thermal oxidation to lead the stibium doped stannic oxide to be bonded firmly with the titanium dioxide nanotubes directly connected with the titanium matrix. The stannic oxide crystal particles prepared by the electro-deposition method are dispersed evenly, and the electrode surface is compact and has no crack. The method overcomes the defect that crack is generated on the surface of the electrode prepared by the traditional brush coating thermal decomposition method. The electrode prepared by the invention has high potential for oxygen evolution, high electric catalytic activity and long service life and the like; the preparation process is easily controlled, has low cost and lower equipment requirements; and the prepared electrode can effectively treat pollutants that are poorly biodegradable.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic electrode preparation, in particular to a method for preparing a titanium-based titanium dioxide nanotube tin dioxide electrode. Background technique [0002] Electrochemical oxidation has attracted widespread attention due to its high efficiency, environmental compatibility and friendliness. Electrochemical oxidation mainly uses electrons as reagents, and does not need to add any chemical reagents, which avoids the secondary pollution caused by additional reagents. Electrochemical oxidation can generally be carried out at normal temperature and pressure, and is an energy-saving and environmentally friendly technology. . In the process of electrochemical oxidation treatment of organic wastewater, electrodes not only play the role of transmitting current, but also catalyze the degradation of organic matter. Therefore, the selection of electrode materials directly affects the degradation ...

Claims

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Application Information

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IPC IPC(8): C02F1/461
Inventor 韩卫清陈勇王连军洪蕾薛红民孙秀云李健生刘晓东
Owner NANJING UNIV OF SCI & TECH
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