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TiO2 nano-tube doped with cobalt element and preparation method thereof and applications

A technology of element doping and nanotubes, which is applied in the field of photocatalytic materials and solar energy utilization, to achieve the effect of improving photovoltage and filling factor, excellent photoelectric conversion performance, and improving activity

Active Publication Date: 2018-06-26
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 The photogenerated electron-hole pairs of nanotubes are effectively separated to improve the photocatalytic activity research work. A large number of documents have proposed solutions, such as noble metal deposition modification, liquid phase deposition modification, etc., among which Zhang et al. (Non-uniformdoping outperforms uniform doping for enhancing the photocatalytic efficiency of Au-doped TiO 2 Nanotubes in organic dye degradation.Ceramics International, 43(12), 2017, 9053-9059) were first prepared on TiO by sol-gel method-hydrothermal method 2 Nanotubes were uniformly doped with noble metal Au, and then Au-doped TiO was prepared by liquid phase deposition. 2 nanotubes, the activity of photocatalytic degradation of dyes has been greatly improved; but in order to prevent TiO 2 The collapse of the tube wall occurs when the nanotubes are treated at high temperature, and the prepared TiO 2 The heat treatment temperature of nanotubes is only 340°C, and the heat treatment temperature restricts the TiO 2 Nanotube TiO 2 Grain Growth and TiO 2 crystal transformation

Method used

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  • TiO2 nano-tube doped with cobalt element and preparation method thereof and applications
  • TiO2 nano-tube doped with cobalt element and preparation method thereof and applications
  • TiO2 nano-tube doped with cobalt element and preparation method thereof and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Preparation of cobalt doped titanium sol

[0031] Put 40mL of deionized water and 5mL of hydrochloric acid in a three-necked flask, and slowly add 50mL of TiCl dropwise under stirring 4 , continue to stir for 1 h after dropping, and stand in the dark for 24 h to obtain a titanium sol; according to the molar ratio of Co / Ti of 1%, 0.05M cobalt nitrate solution is added dropwise to the titanium sol to obtain a cobalt-doped titanium sol .

[0032] (2) Preparation of cobalt doped TiO 2 Nano powder

[0033] In a three-neck flask equipped with 25mL deionized water and 25mL ethanol, under stirring conditions, slowly add the cobalt element-doped titanium sol and ammonia water dropwise, and then continue to drop a small amount of ammonia water after the sol is added dropwise, until the pH 8 to 9, the cobalt-doped titanium gel is obtained; the gel is dried at 100°C and fired at 650°C for 1 hour to obtain cobalt-doped TiO 2 Nano powder.

[0034] (3) Preparation of cobalt-d...

Embodiment 2

[0038] Steps (1) and (2) are the same as in Example 1.

[0039] (3) Preparation of cobalt-doped TiO by hydrothermal synthesis combined with liquid deposition 2 nanotube

[0040] A, the cobalt element that step (1) makes is doped TiO 2 2g of nanopowder and 40mL of 10M NaOH solution were placed in a stainless steel hydrothermal reaction kettle, hydrothermally reacted at 140°C for 48h, cooled to room temperature after the reaction, the white precipitate was taken out, and washed several times with deionized water until the supernatant was neutral , and then soaked in 0.1M HCl solution for 5h, continued to wash several times with deionized water until the supernatant was neutral, dried the white precipitate at 80°C, and labeled the dried sample as CoTNT80.

[0041] B. Weigh 0.2g CoTNT80 and place it in a mixture of 125mL 0.1mol / L ammonium fluotitanate solution and 125mL 0.3mol / L boric acid solution, liquid phase deposition for 80min, dry at 80°C and continue roasting at 400°C fo...

Embodiment 3

[0042] Example 3: Cobalt doped TiO 2 Application of nanotubes in dye-sensitized solar cells

[0043] (1) Preparation of cobalt doped TiO 2 Nanotube slurry: 3g cobalt doped TiO 2 The nanotube sample was placed in a mortar, then 1 mL of 10% acetylacetone in absolute ethanol was added, and ground for 30 min; then 4.5 mL of water, 0.1 mL of Triton X-100 (TritonX-100 for short) and 30% wt ( 0.9g) the mixed solution of polyethylene glycol (molecular weight 20000), grind 30min, obtain cobalt element doped TiO 2 Nanotube slurry;

[0044] (2) Preparation of TiO by powder coating method 2 Nanotube thin film electrode: use scotch tape to stick longitudinally on the drawn two layers of TiO 2 On both sides of the thin film FTO conductive glass, add 2mL cobalt doped TiO 2 Nanotube slurry, roll coating with a glass rod to form a film, the film area is about 0.4×0.4cm 2 ; Then place the film in a muffle furnace, raise the temperature to 500°C at a rate of 2°C / min, keep it warm for one ...

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Abstract

The present invention discloses a TiO2 nano-tube doped with a cobalt element and a preparation method thereof and applications. The preparation method comprises the following steps: preparing a TiO2 nano-scale powder doped with the cobalt element via a TiCl4 hydrolysis method; and preparing the TiO2 nano-tube doped with a cobalt element by using a hydrothermal synthesis method combined with a liquid-phase deposition treatment. The TiO2 nano-tube doped with the cobalt element can maintain good tubular morphology under 400 DEG C heat treatment, the crystal structure is an anatase / rutile mixed crystal structure, and the nano-tube has relatively high specific surface area. The recombination of photo-generated electron-hole pair is effectively inhibited via cobalt element doping combined withthe liquid-phase deposition process, so that the activity of photo-catalytic degradation of methyl orange is largely improved, and an assembled dye-sensitized solar cell taking the prepared TiO2 nano-tube doped with the cobalt element as an anode material shows excellent photoelectric conversion performance.

Description

technical field [0001] The invention relates to the fields of photocatalytic materials and solar energy utilization, in particular to a cobalt-doped TiO 2 Nanotubes and methods of preparation and applications thereof. Background technique [0002] At present, with the global energy crisis, environmental pollution problems becoming more and more prominent, and human beings' requirements for sustainable development, people have been devoting themselves to the development of non-polluting clean energy --- solar energy. It is the most direct and effective method to directly use solar energy to solve the problems of energy shortage and environmental pollution. Therefore, the Chinese government has formulated and implemented the "China Bright Project" plan, imitating the photosynthesis principle of plants in nature and developing artificial synthesis technology, which is called For the "21st Century Dream" technology. Photocatalytic technology has been developed as an environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/042
CPCH01G9/20H01G9/2022H01G9/2031Y02E10/542
Inventor 张玉媛陈东初户华文常萌蕾魏红阳
Owner FOSHAN UNIVERSITY
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