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Method for doping nano-Ag particles in TiO2 nanotubes

A technology of nano-silver particles and titanium dioxide, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the difficulty of nano-particles on the surface of nano-tubes and uneven distribution of nanoparticles , complex preparation process, etc., to achieve the effects of shortened reaction time, simple operation, and high electrocatalytic efficiency

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional preparation methods of nanoparticles (such as photoreduction method, sol-gel method) have high reaction temperature, complicated preparation process, and uneven distribution of prepared nanoparticles, which causes great problems for the preparation of nanoparticles on the surface of nanotubes. big difficulty

Method used

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  • Method for doping nano-Ag particles in TiO2 nanotubes
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  • Method for doping nano-Ag particles in TiO2 nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) A two-electrode system (titanium sheet for the anode and platinum sheet for the cathode), electrolyte concentration: glycerol: water volume ratio 1:1, NH 4 The concentration of F is 0.3mol / L, the voltage is 30V, and the time is 3h, the self-assembled TiO 2 nanotube.

[0022] (2) TiO prepared by step (1) 2 The titanium sheet of the nanotube is placed in a silver nitrate solution and deposited at 40° C. for 7 hours. In the silver nitrate solution, the volumes of ethylene glycol and water are each 25 ml, the concentration of polyvinylpyrrolidone is 0.001 mol / L, and NaBH 4 The concentration is 0.048mol / L, AgNO 3 The concentration is 0.045mol / L.

Embodiment 2

[0024] (1) A two-electrode system is used (the anode is Ti-Zr-Nb alloy, wherein the atomic molar ratio of Ti, Zr and Nb is 73:2:25, and the cathode is platinum sheet), the electrolyte concentration: the volume ratio of glycerol: water 1:1, NH 4 The concentration of F is 0.3mol / L, the voltage is 30V, and the time is 3h, the self-assembled TiO 2 nanotube.

[0025] (2) TiO prepared by step (1) 2 The Ti-Zr-Nb alloy of the nanotube is placed in a silver nitrate solution and deposited at 40° C. for 3 hours. In the silver nitrate solution, the volumes of ethylene glycol and water are each 25 ml, and the concentration of polyvinylpyrrolidone is 0.001 mol / L. NaBH 4 The concentration is 0.048mol / L, AgNO 3 The concentration is 0.045mol / L.

Embodiment 3

[0027] (1) A two-electrode system (titanium sheet for the anode and platinum sheet for the cathode), electrolyte concentration: glycerol: water volume ratio 1:1, NH 4 The concentration of F is 0.3mol / L, the voltage is 30V, and the time is 3h, the self-assembled TiO 2 nanotube.

[0028] (2) TiO prepared by step (1) 2 The titanium sheet of the nanotube is placed in a silver nitrate solution and deposited at 50° C. for 7 h. In the silver nitrate solution, the volumes of ethylene glycol and water are each 25 ml, the concentration of polyvinylpyrrolidone is 0.001 mol / L, and NaBH 4 The concentration is 0.048mol / L, AgNO 3 The concentration is 0.045mol / L.

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Abstract

The invention relates to a method with low cost and simple preparation process for doping nano-Ag particles in TiO2 nanotubes. The method can realize that nanoparticles can be evenly distributed and the electrocatalysis efficiency of TiO2 nanotubes can be increased. The method comprises the following steps: firstly utilizing a two-electrode system to prepare TiO2 nanotubes, secondly placing the prepared titanium alloy or pure titanium with TiO2 nanotubes in silver nitrate solution to deposit, performing an electrocatalysis experiment in basic ethanol solution to obtain TiO2 nanotubes doped with nano-Ag particles. The current densities of the oxidation peak and reduction peak of the obtained TiO2 nanotubes are separately up to 1mA / cm<2> and 3.2mA / cm<2> and the TiO2 nanotubes has higher electrocatalysis efficiency.

Description

technical field [0001] The invention relates to a method for modifying materials, more specifically, relates to a method for modifying nanometer materials by hydrothermal method. Background technique [0002] In recent years, due to the increasingly severe energy shortage, people began to look for green and efficient new fuels to replace traditional energy sources. At present, scholars at home and abroad have begun to study catalysts with large specific areas, so as to effectively improve the catalytic efficiency of ethanol fuel cells. Titanium dioxide nanotubes have become one of the most popular catalysts due to their excellent properties such as low preparation cost, large specific surface area, regular surface morphology, good photostability and chemical inertness. At present, in order to further improve the TiO 2 The catalytic efficiency of nanotubes, the researchers used the self-doping method in TiO 2 The surface of nanotubes is doped with various noble metals, suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B29/62C30B30/02C25D11/26B01J21/06B01J23/50B01J37/02
Inventor 梁砚琴杨贤金崔振铎朱胜利
Owner TIANJIN UNIV
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