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Preparation and application of Zn-Cr-O/TiO2 nanotube oxide with efficient photoelectric conversion and photocatalytic performance

A photoelectric conversion and photocatalysis technology, applied in electrodes, electrolytic coatings, electrolytic processes, etc., to achieve the effect of improving the activity of photocatalytic hydrogen production

Inactive Publication Date: 2017-10-24
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anatase TiO 2 The wide band gap makes it very limited in the absorption of visible light. It can only absorb the ultraviolet part of sunlight, and the ultraviolet part only accounts for 3-5% of sunlight.

Method used

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  • Preparation and application of Zn-Cr-O/TiO2 nanotube oxide with efficient photoelectric conversion and photocatalytic performance
  • Preparation and application of Zn-Cr-O/TiO2 nanotube oxide with efficient photoelectric conversion and photocatalytic performance
  • Preparation and application of Zn-Cr-O/TiO2 nanotube oxide with efficient photoelectric conversion and photocatalytic performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Polish the surface of the titanium sheet with 500-grit sandpaper, ultrasonically clean it with deionized water, acetone, and ethanol in turn, and dry it in the air as the anode in the battery;

[0028] (2) Dissolve 1,3-propanediol and NaF in ultrapure water and stir evenly as an electrolyte solution. The mass ratio of 1,3-propanediol, NaF and ultrapure water is 95:1:4. Fix the titanium plate treated in (1) as an anode on the battery holder, add electrolyte, connect the titanium plate to the positive pole of the power supply, connect the platinum plate to the negative pole of the power supply, control the voltage at 30 V, and oxidize for 5 hours;

[0029] (3) Wash the oxidized titanium sheet obtained in (2) with ethanol, air-dry it, and place it in a muffle furnace for temperature-programmed roasting in two stages. First, the temperature is raised to 400 °C at a heating rate of 2 °C / min, and the temperature is kept for 2 hours. Then use a heating rate of 4 °C / min to ...

Embodiment 2

[0035] (1) Same as step (1) in implementation example 1;

[0036] (2) Ethylene glycol, NH 4 HF 2 Dissolve in ultrapure water, stir evenly as electrolyte, in which ethylene glycol, NH 4 HF 2 The mass ratio to ultrapure water is 97.5:2.0:0.5. Fix the titanium plate processed in (1) as an anode on the battery holder, add electrolyte, connect the titanium plate to the positive pole of the power supply, and connect the platinum plate to the negative pole of the power supply. The control voltage is 40 V. Oxidation time is controlled at 4h;

[0037] (3) Wash the oxidized titanium sheet obtained in (2) with ethanol, air-dry it, and place it in a muffle furnace for temperature-programmed roasting in two stages. First, the temperature is raised to 400 °C at a heating rate of 2 °C / min, and the temperature is kept for 2 hours. Then use a heating rate of 5 °C / min to raise the temperature to 500 °C, keep it for 2 hours, and cool to room temperature to obtain TiO 2 -NTs;

[0038] (4)...

Embodiment 3

[0043] (1) Same as step (1) in the implementation example one;

[0044] (2) Dissolve 1,2-propanediol and NaF in ultrapure water and stir evenly as electrolyte, in which the mass ratio of 1,2-propanediol, NaF and ultrapure water is 96:3:1. Fix the titanium plate processed in (1) as an anode on the battery holder, add electrolyte, connect the titanium plate to the positive pole of the power supply, and connect the platinum plate to the negative pole of the power supply. The control voltage is 50 V. Oxidation time is controlled at 2h;

[0045] (3) Wash the oxidized titanium sheet obtained in (2) with ethanol, air-dry it, and place it in a muffle furnace for temperature-programmed roasting in two stages. First, the temperature is raised to 400 °C at a heating rate of 2 °C / min, and the temperature is kept for 2 hours. Then use a heating rate of 4 °C / min to raise the temperature to 800 °C, keep it for 1 h, and cool to room temperature to obtain TiO 2 -NTs;

[0046] (4) Weigh zin...

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Abstract

The invention discloses a preparation method of Zn-Cr-O / TiO2-nanotube (NTs) composite oxide with efficient photoelectric conversion and photocatalytic performance. The specific preparation method comprises the steps that through an electrochemical workstation, the oxide voltage and time are controlled, in an electrolyte prepared through lower alcohol, fluoride and ultrapure water, through the anodic oxidation method, the precursor is prepared, program warming and roasting are carried out, and TiO2-NTs is obtained; the TiO2-NTs is immersed in a zinc nitrate and chromic nitrate mixed solution with the quantity relative ratio being (1.0 to 7.0):1.0, the cathode deposition and electrochemical oxidation technology is adopted into TiO2-NTs loaded Zn-Cr-O composite oxide, deposition sample rotating is carried out, and the Zn-Cr-O / TiO2-NTs composite oxide with excellent photoelectric conversion and photocatalytic performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of new materials and their preparation, and relates to a TiO 2 ZnO / ZnCr supported on nanoarray tubes (NTs) 2 o 4 A preparation method of (Zn-Cr-O) composite oxide material, which has good photoelectric conversion and photocatalytic properties under simulated sunlight irradiation. technical background [0002] Since the beginning of the 20th century, with the development of the economy and the over-exploitation of natural resources, while enjoying the benefits brought by technology, human beings are also suffering the consequences of environmental changes and the depletion of natural resources due to their own behavior. In recent years, environmental damage and energy crisis are two serious problems facing human society. Various countries have formulated relevant laws to address this issue, and proposed the goals and approaches for sustainable development of renewable energy, integrating various low-carbon ...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04C25D11/26
CPCC25B1/04C25D11/26C25B1/55C25B11/091Y02E60/36
Inventor 张丽戴超华阎建辉梁青满黄杨杨鹏
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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