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Preparation method of cobalt, nickel double-layer hydroxide modified titanium dioxide nanotube array and application of photoelectrochemical hydrolysis hydrogen production

A double-layer hydroxide, nanotube array technology, applied in nanotechnology for materials and surface science, electrolysis components, electrolysis processes, etc., can solve the problems of low photoelectric catalytic activity, difficulty in efficiently utilizing sunlight, etc. Easy to operate, controllable coverage density, and beneficial to the transfer of photogenerated electrons

Active Publication Date: 2020-10-09
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of cobalt, nickel double-layer hydroxide modified titanium dioxide nanotube array and application of photoelectrochemical hydrolysis hydrogen production
  • Preparation method of cobalt, nickel double-layer hydroxide modified titanium dioxide nanotube array and application of photoelectrochemical hydrolysis hydrogen production
  • Preparation method of cobalt, nickel double-layer hydroxide modified titanium dioxide nanotube array and application of photoelectrochemical hydrolysis hydrogen production

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Experimental program
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Effect test

Embodiment 1

[0049] The polished titanium sheet (1×3cm 2 ) surface is cleaned and air-dried. Dissolve 0.5 g of ammonium fluoride in 100 mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium sheet in the above solution, and clamp the other end with the electrode clip of a potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, and dried in a vacuum drying oven at 60°C for 5 h. Put it in 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, take 50mL and put it in a beaker, and place it in a three-electrode system for electrodeposition at a constant potential of -1V for 5s. The samples were washed alternately with ethanol and deionized water, and stored in a vacuum drying oven. figure 1 for the prepared TiO 2 SEM picture of the nanotube array. shows that at a small magnification, TiO 2 Th...

Embodiment 2

[0051] The polished titanium sheet (1×3cm 2 ) surface is cleaned and air-dried. Dissolve 0.5 g of ammonium fluoride in 100 mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium sheet in the above solution, and clamp the other end with the electrode clip of a potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, and dried in a vacuum drying oven at 60°C for 5 h. Put it in 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, take 50mL and place it in a beaker, and place it in a three-electrode system for electrodeposition at constant potential -1V for 20s. The samples were washed alternately with ethanol and deionized water, and stored in a vacuum drying oven.

Embodiment 3

[0053] The polished titanium sheet (1×3cm 2 ) surface is cleaned and air-dried. Dissolve 0.5 g of ammonium fluoride in 100 mL of hexanediol aqueous solution, stir evenly, immerse one end of the cleaned titanium sheet in the above solution, and clamp the other end with the electrode clip of a potentiostat, and control the voltage at 50V. 2h. The samples were taken out, washed alternately with ethanol and deionized water, and dried in a vacuum drying oven at 60°C for 5 h. Put it in 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, take 50mL and place it in a beaker, and place it in a three-electrode system for electrodeposition under constant potential -1V for 30s. The samples were washed alternately with ethanol and deionized water, and stored in a vacuum drying oven.

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Abstract

The invention discloses a preparation method of a cobalt-nickel double-layer hydroxide-modified titanium dioxide nanotube array electrode and its application in hydrogen production by photoelectrochemical hydrolysis. By electrochemical deposition method, on TiO 2 Rapid and controllable modification of cobalt and nickel bilayer hydroxides on nanotube walls. The reaction process is not only fast and efficient, but also CoNi‑LDHs in TiO 2 The surface coverage density of nanotubes is controllable. The modification of CoNi‑LDHs significantly improved the TiO 2 The absorption efficiency of nanotubes to ultraviolet light prolongs the life of photogenerated electrons, accelerates the separation of photogenerated electrons and holes, and the clean contact interface between the two is also conducive to the transfer of photogenerated electrons. This rapid and controllable synthesis of cobalt and nickel bilayer hydroxide-modified TiO 2 The new method of heterogeneous nanotube array electrode is convenient to operate, easy to industrialize, and 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 Patents(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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