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A kind of bismuth vanadate composite material loaded with magnetic nanoparticles and its preparation and application

A technology of magnetic nanoparticles and composite materials, applied in the field of BiVO4-based composite materials, can solve the problems affecting the photocatalytic reaction efficiency, low carrier transmission rate, etc.

Active Publication Date: 2020-05-12
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BiVO 4 The low transport rate of carriers generated under light will affect the photocatalytic reaction efficiency, so it is urgent to further propose to reduce the BiVO 4 Efficient way to recombine photogenerated electrons and holes

Method used

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  • A kind of bismuth vanadate composite material loaded with magnetic nanoparticles and its preparation and application
  • A kind of bismuth vanadate composite material loaded with magnetic nanoparticles and its preparation and application
  • A kind of bismuth vanadate composite material loaded with magnetic nanoparticles and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1. Preparation of NiS / BiVO4 composites

[0037] (1) Preparation of BiOI thin films

[0038] BiOI thin films were prepared by cyclic voltammetry electrodeposition in a three-electrode system. The three electrodes are: platinum sheet as counter electrode, Ag / AgCl electrode as reference electrode, FTO conductive glass as working electrode (use isopropanol, acetone, absolute ethanol, and double distilled water to ultrasonically clean in sequence before use). Electrodeposition conditions: the potential window is 0V~-0.13V, the scanning speed is 5mV / s, the number of scanning cycles is 10, and the electrodeposition is carried out at room temperature. After electrodeposition was completed, it was rinsed with double distilled water and dried at 60°C. The electrolyte for preparing BiOI thin films by electrodeposition is prepared as follows:

[0039] a. Weigh 3-3.5g potassium iodide (KI) into a dry and clean beaker, add 40-60 mL of secondary distilled water, stir under ...

Embodiment 2

[0051] Example 2. CoS / BiVO 4 Preparation of composite materials

[0052] (1) Preparation of BiOI film: the same as in Example 1;

[0053] (2) BiVO 4 Preparation of film: same as Example 1;

[0054] (3) Preparation of CoS: Co(NO 3 ) 2 ·7H 2 O (7.3 g, 0.025 mol) and thiourea (5.45 g, 0.06 mol) were mixed in 80 mL of ethylene glycol solution, stirred evenly, and then placed in a stainless steel autoclave lined with polytetrafluoroethylene, and the reaction temperature was controlled at The reaction was carried out at 140°C to 160°C for 15 to 16 hours; the reaction product was centrifuged and washed three times with ethanol and deionized water, and then kept dry at 80°C for 10 to 12 hours. The obtained sample was ground to obtain 1.8 g of nano-CoS powder.

[0055] (4) CoS / BiVO 4 Composite material: Add nano-CoS powder to 2.5mL ethanol solution, and ultrasonically disperse it for 30-40 minutes to obtain a suspension; use a pipette to suck up a small amount (100 μL) of CoS et...

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Abstract

The invention provides preparation of BiVO4 composite materials NiS / BiVO4 and CoS / BiVO4 loaded with magnetic nanoparticles NiS and CoS. The preparation comprises the steps: with BiVO4 as a material, firstly, depositing on FTO conductive glass by an electrochemical deposition method to prepare a precursor thin film; then calcining to synthesize a BiVO4 thin film; and next, through combination of chemical deposition, heating treatment and electrophoretic deposition techniques, successfully loading a structure of the BiVO4 thin film with magnetic NiS and CoS nanoparticles, and constructing n-n heterojunction by a dropping coating method, to form NiS / BiVO4 and CoS / BiVO4 composite materials having a baseball structure. The structure effectively inhibits the recombination of photogenerated carriers and accelerates the separation of electrons and holes. Therefore, the composite materials have excellent PEC activity; as a photoanode for hydrogen evolution reaction, the composite materials exhibit excellent performance of electrolysis of water to produce hydrogen.

Description

technical field [0001] The present invention relates to a BiVO 4 Matrix composite material, especially a BiVO loaded with magnetic nanoparticles NiS and CoS 4 The preparation of composite materials NiS / BiVO4 and CoS / BiVO4 are mainly used as photoanode materials for hydrogen evolution reaction. Background technique [0002] As resource shortages increase, hydrogen energy is increasingly receiving widespread attention. Photoelectrochemical (PEC) cells have been unveiled as one of the highest profile routes to hydrogen production. BiVO 4 As a typical n-type semiconductor with a forbidden band width Eg of about 2.4 eV, it has visible light activity and is used as a photoanode for hydrogen evolution reaction. However, BiVO 4 The low transport rate of carriers generated under illumination will affect the photocatalytic reaction efficiency, so there is an urgent need to further propose a reduction in BiVO 4 An efficient method for the recombination of photogenerated electrons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B11/051C25B11/091Y02E60/36Y02P20/133
Inventor 王其召姜曼黄静伟王磊佘厚德白燕
Owner NORTHWEST NORMAL UNIVERSITY
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