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Preparation method for titanium dioxide nanotube array decorated with cobalt and nickel double-layer hydroxide and application of photoelectron-chemistry hydrolysis hydrogen production

A technology of double-layer hydroxide and nanotube arrays, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of difficult and efficient use of sunlight and low photoelectric catalytic activity, and achieve Easy to operate, easy to industrialize, and improve the effect of photoelectrochemical activity

Active Publication Date: 2016-10-05
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 The forbidden band width is 3.2eV, the band gap is wide, and its light absorption range is limited to the ultraviolet region (accounting for only 5% of the total solar energy), and the photogenerated electron-hole recombination is extremely fast under light conditions, and the photocatalytic activity is relatively high. low, so directly use TiO 2 As a photoanode material, it is difficult to efficiently use sunlight

Method used

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  • Preparation method for titanium dioxide nanotube array decorated with cobalt and nickel double-layer hydroxide and application of photoelectron-chemistry hydrolysis hydrogen production
  • Preparation method for titanium dioxide nanotube array decorated with cobalt and nickel double-layer hydroxide and application of photoelectron-chemistry hydrolysis hydrogen production
  • Preparation method for titanium dioxide nanotube array decorated with cobalt and nickel double-layer hydroxide and application of photoelectron-chemistry hydrolysis hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Polish a smooth titanium sheet (1×3cm 2 ) surface cleaned and air dried. Dissolve 0.5g of ammonium fluoride in 100mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium piece in the above solution, and clamp the other end with the electrode clamp of the potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, placed in a vacuum oven at 60°C, and dried for 5 hours. Put it into a muffle furnace and heat it at 600°C for 2h. Next, prepare CoCl at a concentration of 5 mM 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O mixed solution, 50mL was placed in a beaker, and placed in a three-electrode system for electrodeposition at a constant potential of -1V for 5s. The samples were taken out and washed alternately with ethanol and deionized water, and stored in a vacuum oven. figure 1 For the prepared TiO 2 SEM image of nanotube arrays. shows that at a small magnification, the TiO...

Embodiment 2

[0051] Polish a smooth titanium sheet (1×3cm 2 ) surface cleaned and air dried. Dissolve 0.5g of ammonium fluoride in 100mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium piece in the above solution, and clamp the other end with the electrode clamp of the potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, placed in a vacuum oven at 60°C, and dried for 5 hours. Put it into a muffle furnace and heat it at 600°C for 2h. Next, prepare CoCl at a concentration of 5 mM 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O mixed solution, 50mL was placed in a beaker, and placed in a three-electrode system for electrodeposition at a constant potential of -1V for 20s. The samples were taken out and washed alternately with ethanol and deionized water, and stored in a vacuum oven.

Embodiment 3

[0053] Polish a smooth titanium sheet (1×3cm 2 ) surface cleaned and air dried. Dissolve 0.5g of ammonium fluoride in 100mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium piece in the above solution, and clamp the other end with the electrode clamp of the potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, placed in a vacuum oven at 60°C, and dried for 5 hours. Put it into a muffle furnace and heat it at 600°C for 2h. Next, prepare CoCl at a concentration of 5 mM 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O mixed solution, 50mL was placed in a beaker, and placed in a three-electrode system for electrodeposition at a constant potential of -1V for 30s. The samples were taken out and washed alternately with ethanol and deionized water, and stored in a vacuum oven.

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Abstract

The invention discloses a preparation method for a titanium dioxide nanotube array electrode decorated with a cobalt and nickel double-layer hydroxide and application of photoelectron-chemistry hydrolysis hydrogen production. Through an electrochemical deposition method, the tube walls of titanium dioxide nanotubes are rapidly and controllably decorated with the cobalt and nickel double-layer hydroxide. The reaction process is rapid and efficient, and the covering density of CoNi-LHDs on the surfaces of the titanium dioxide nanotubes is controllable. The decoration of the CoNi-LHDs remarkably improves the ultraviolet light absorption efficiency of the titanium dioxide nanotubes and prolongs the service life of photo-generated electrons, separation between the photo-generated electrons and holes is accelerated, and the clean contact interfaces between the photo-generated electrons and the holes are also beneficial for transmission of the photo-generated electrons. By the adoption of the new method for compounding the titanium dioxide heterogeneous nanotube array electrode decorated with the cobalt and nickel double-layer hydroxide rapidly and controllably, operation is easy, industrialization is easy, and the new method has important application value.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic semiconductor nanomaterials, and relates to a titanium dioxide (TiO2) modified by cobalt and nickel double-layer hydroxides (CoNi-LDHs) 2 ) Nanotubes (TiO 2 @CoNi-LDHs) array electrode preparation method and its application in photoelectrochemical hydrolysis hydrogen production. Background technique [0002] Since 1972, two professors, Fujishima A and Honda K of the University of Tokyo, Japan, first reported the discovery of TiO 2 The phenomenon of hydrogen generation by photocatalytic water splitting at single crystal electrodes has begun, and the technology of photo-splitting water for hydrogen production has attracted extensive attention. As a method of directly using solar energy to produce hydrogen, a clean energy source, the development of photo-splitting water technology is becoming more and more important in the era of resource shortage. More and more semiconductor materials are us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C25B1/04C25B11/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25B1/04C25D9/04C25B11/051C25B11/057C25B11/091Y02E60/36
Inventor 李士阔陈炜健
Owner ANHUI UNIVERSITY
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