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Hydroxyl functionalized carbon dot modified bismuth vanadate film, and preparation method and application thereof

A functionalized bismuth vanadate technology, applied in energy input, electrodes, electrolysis process, etc., can solve the problems of poor bulk phase transport and surface transport capacity, achieve efficient and simple methods, and promote bulk phase transport and surface transport The effect of the process

Active Publication Date: 2021-06-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention targets BiVO 4 The problems of thin film carrier phase transport and poor surface transport ability provide a hydroxyl functionalized carbon dot modified BiVO 4 thin film, which is in conventional BiVO 4 The hydroxyl-functionalized carbon dots are modified on the film, which can significantly improve the BiVO by simultaneously promoting the bulk transport and surface transport processes of carriers. 4 The carrier separation efficiency, transport efficiency and photoelectrochemical properties of the film; among them, the hydroxyl-functionalized carbon dots were prepared by liquid-phase pulsed laser irradiation technology, and then the hydroxyl-functionalized carbon dots were self-assembled on BiVO 4 On the surface of the film, BiVO modified with hydroxyl-functionalized carbon dots was obtained 4 Thin film, the method is simple and universal

Method used

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  • Hydroxyl functionalized carbon dot modified bismuth vanadate film, and preparation method and application thereof
  • Hydroxyl functionalized carbon dot modified bismuth vanadate film, and preparation method and application thereof
  • Hydroxyl functionalized carbon dot modified bismuth vanadate film, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] A Mo:BiVO Modified by Hydroxyl-functionalized Carbon Dots Based on Tannic Acid 4 Thin films, including Mo:BiVO 4 Thin films and modifications on Mo:BiVO 4 Hydroxyl-functionalized carbon dots on the surface of the film, hydroxyl-functionalized carbon dots on Mo:BiVO modified with hydroxyl-functionalized carbon dots 4 The thickness of the film surface was 4 nm.

[0041] Concrete preparation method comprises the following steps:

[0042] Step 1, 10 mg of tannic acid powder is dispersed in 10 ml of acetone to obtain a mixed solution;

[0043] Step 2: Ultrasonic pretreatment of the mixed solution for 30 minutes, and then the mixed solution is irradiated under a non-focused laser beam for reaction. During the reaction, ultrasonic assistance is used to fully proceed the reaction; the pulse frequency of the non-focused laser is 10 Hz, and the output The wavelength is 355nm, the output spot diameter is 10mm, and the single pulse energy is 650mJ / cm 2 , after irradiating for ...

Embodiment 2

[0048] A Mo:BiVO Modified by Hydroxyl-functionalized Carbon Dots Based on Tannic Acid 4 Thin films, including Mo:BiVO 4 Thin films and modifications on Mo:BiVO 4 Hydroxyl-functionalized carbon dots on the surface of the film, hydroxyl-functionalized carbon dots on Mo:BiVO modified with hydroxyl-functionalized carbon dots 4 The thickness of the film surface was 4 nm.

[0049] The specific preparation method is exactly the same as that of Example 1, except that 5 mg of tannic acid powder is dispersed in 20 ml of ethanol in Step 1 of Example 2 to obtain a mixed solution.

Embodiment 3

[0051] A Gallic Acid-Based Mo:BiVO Modified by Hydroxy-functionalized Carbon Dots 4 Thin films, including Mo:BiVO 4 Thin films and modifications on Mo:BiVO 4 Hydroxyl-functionalized carbon dots on the surface of the film, hydroxyl-functionalized carbon dots on Mo:BiVO modified with hydroxyl-functionalized carbon dots 4 The thickness of the film surface was 3 nm.

[0052] Concrete preparation method comprises the following steps:

[0053] Step 1, dispersing 8 mg of gallic acid powder in 10 ml of acetone to obtain a mixed solution;

[0054] Step 2: Ultrasonic pretreatment of the mixed solution for 30 minutes, and then the mixed solution is irradiated under a non-focused laser beam for reaction. During the reaction, ultrasonic assistance is used to fully proceed the reaction; the pulse frequency of the non-focused laser is 10 Hz, and the output The wavelength is 355nm, the output spot diameter is 10mm, and the single pulse energy is 450mJ / cm 2 , after irradiating for 10 minu...

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Abstract

The invention discloses a hydroxyl functionalized carbon dot modified bismuth vanadate film, and a preparation method and application thereof, belonging to the technical field of photoelectric catalytic materials. The hydroxyl functionalized carbon dot modified bismuth vanadate film comprises a bismuth vanadate film and hydroxyl functionalized carbon dots modifying the bismuth vanadate film, wherein the hydroxyl functionalized carbon dots are prepared by taking a polymer containing ortho-phenolic hydroxyl groups as a raw material through laser beam irradiation, and the hydroxyl functionalized carbon dots modifies the surface of the bismuth vanadate film through chelation between the ortho-phenolic hydroxyl groups of the hydroxyl functionalized carbon dots and metal elements in the bismuth vanadate film. According to the invention, the hydroxyl functionalized carbon dots are prepared through a liquid-phase pulse laser irradiation technology, and the hydroxyl functionalized carbon dots are self-assembled on the surface of the bismuth vanadate film, so the hydroxyl functionalized carbon dot modified bismuth vanadate film is obtained; and the method is easy to operate, high in universality and capable of remarkably improving the carrier separation efficiency, the transmission efficiency and the photoelectrochemical performance of the bismuth vanadate film.

Description

technical field [0001] The invention belongs to the technical field of photoelectric catalysis materials, and in particular relates to a bismuth vanadate film modified with hydroxyl-functionalized carbon points, a preparation method and an application. Background technique [0002] Hydrogen energy has the characteristics of green efficiency, abundant sources, easy storage, and rich application scenarios. It is considered to be the clean energy with the most development potential in the 21st century. The photoelectrochemical water splitting hydrogen production technology uses sunlight to split water to generate hydrogen, and stores the captured solar energy in the form of high-energy chemical bonds in hydrogen, which is a clean and efficient method for hydrogen production. In the photoelectrochemical water splitting reaction system, the photoelectrode material serves as the light-absorbing layer and is the core of the entire reaction system. Among many photoelectrode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/55C25B1/04C25B11/091
CPCC25B1/04Y02P20/133Y02E60/36
Inventor 王洪强简洁李凡叶谦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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