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TiO2/GQDs/NiS heterojunction photoanode and preparation method thereof

A photoanode and heterojunction technology, applied in the field of photoelectrochemical materials and photocatalysis, to achieve good stability, strong photoelectrochemical response, and excellent light absorption performance

Active Publication Date: 2017-10-03
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on GQDs is still in the early stage, and the potential of this material has not been fully explored. Therefore, considering the unique physical and chemical properties of GQDs, combining GQDs with TiO 2 Compound modification of photosensitive semiconductor materials

Method used

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  • TiO2/GQDs/NiS heterojunction photoanode and preparation method thereof
  • TiO2/GQDs/NiS heterojunction photoanode and preparation method thereof
  • TiO2/GQDs/NiS heterojunction photoanode and preparation method thereof

Examples

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Embodiment 1

[0019] (1) Synthesis of TiO by anodic oxidation 2 For nanotubes, the titanium sheet was sonicated in acetone, ethanol, and distilled water for 15 minutes respectively. The electrolyte is 0.3wt% ammonium fluoride, 2wt% distilled water, and 100mL of ethylene glycol. Add 10mL of graphene quantum dots to the electrolyte, set the output voltage of the DC stabilized power supply to 60V, and anodize for 2 hours Finish. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0020] (2) Immerse the photoanode prepared in step (1) in 0.03M ethanolic nickel nitrate solution for 2min, then rinse off the excess and loose adsorbed ions on the surface of the sample with ethanol, and then immerse the photoelectrode in 0.03M sodium sulfide aqueous solution Medium 5min. Rinse the sample test piece with distilled water, dry it with cold wind, repeat this step 5 times, and save it for processing.

[0021] (3) Place the sample test pie...

Embodiment 2

[0024] (1) Synthesis of TiO by anodic oxidation 2 For nanotubes, the titanium sheet was sonicated in acetone, ethanol, and distilled water for 15 minutes respectively. The electrolyte is 0.3wt% ammonium fluoride, 2wt% distilled water, and 100mL of ethylene glycol. Add 15mL of graphene quantum dots to the electrolyte, set the output voltage of the DC stabilized power supply to 60V, and anodize for 2 hours Finish. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0025] (2) Immerse the photoanode prepared in step (1) in 0.03M ethanolic nickel sulfate solution for 2min, then rinse off the excess and loose adsorbed ions on the surface of the sample with ethanol, and then immerse the photoelectrode in 0.03M potassium sulfide aqueous solution Incubate for 5 minutes, then rinse the sample test piece with distilled water, dry it with cold wind, repeat this step 3 times, dry it, and save it for processing.

[0026] (3)...

Embodiment 3

[0029] (1) Synthesis of TiO by anodic oxidation 2 For nanotubes, the titanium sheet was sonicated in acetone, ethanol, and distilled water for 15 minutes respectively. The electrolyte is 0.3wt% ammonium fluoride, 2wt% distilled water and 100mL of ethylene glycol. Add 20mL of graphene quantum dots to the electrolyte, set the output voltage of the DC stabilized power supply to 60V, and anodize for 2 hours Finish. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0030] (2) Immerse the photoanode prepared in step (2) in 0.03M ethanolic nickel chloride solution for 4min, then rinse off the excess and loose adsorbed ions on the surface of the sample with ethanol, and then immerse the photoelectrode in 0.03M ammonium sulfide After soaking in the aqueous solution for 6 minutes, rinse the sample test piece with distilled water, dry it with cold air, repeat this step 8 times, and save it for processing.

[0031] (3) Pl...

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Abstract

The present invention discloses a TiO2 / GQDs / NiS heterojunction photoanode and a preparation method thereof, solving the existing problem of relative low photoelectric conversion efficiency of TiO2. The method comprises the following steps: taking a titanium piece as a substrate, taking ethylene glycol and an ammonium fluoride aqueous solution containing graphene quantum dots (GQDs) as an electrolyte, and preparing a TiO2 composite film containing GQDs by using an anodic oxidation method; depositing NiS nanoparticles on the surface of the TiO2 via a successive ionic layer adsorption-precipitation reaction; and performing annealing reaction for 2 hours in a tube furnace under nitrogen atmosphere to obtain a TiO2 / GQDs / NiS composite photoanode. The photocurrent density of the TiO2 / GQDs / NiS (dipping 8 times) composite film is 2 times of the photocurrent density of a TiO2 nanotube. The method has the advantages of simplicity and easiness for operation, and the TiO2 / GQDs / NiS composite photoelectrode prepared by using the method has high photocatalytic activity and stability.

Description

technical field [0001] The technical field of the invention belongs to the technical field of photocatalysis and photoelectrochemical materials, and particularly relates to the development and preparation method of titanium dioxide heterojunction photocatalyst. Background technique [0002] TiO 2 Nanotube arrays (TNAs) are favored by researchers due to their high specific surface area, excellent charge transport properties, non-toxicity, high catalytic activity, chemical stability and low cost. Applications of TNA in gas sensors, solar cells, biocatalysts, biomedical implant materials, and Li-ion batteries are intriguing. However TiO 2 It can only absorb sunlight with a wavelength below 500nm, and cannot fully utilize the energy of sunlight; and the photogenerated electron-hole pairs are easy to recombine, resulting in low photoelectric conversion efficiency, and there are still many places to be improved and perfected in practical applications. Therefore for TiO 2 Photo...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/042
CPCH01G9/04H01G9/042
Inventor 刘勇平杨之书吕慧丹耿鹏林剑飞米喜红林佩怡
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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