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Bismuth vanadate composite materials loaded with magnetic nanoparticles and preparation and application thereof

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

Active Publication Date: 2018-10-02
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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  • Bismuth vanadate composite materials loaded with magnetic nanoparticles and preparation and application thereof
  • Bismuth vanadate composite materials loaded with magnetic nanoparticles and preparation and application thereof
  • Bismuth vanadate composite materials loaded with magnetic nanoparticles and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, NiS / BiVO The preparation of composite material

[0037] (1) Preparation of BiOI thin film

[0038] BiOI thin films were prepared by electrodeposition by cyclic voltammetry in a three-electrode system. The three electrodes are: platinum sheet as the counter electrode, Ag / AgCl electrode as the reference electrode, and FTO conductive glass as the working electrode (clean with isopropanol, acetone, absolute ethanol, and double distilled water in sequence before use). Electrodeposition conditions: the potential window is 0V~-0.13V, the scan rate is 5mV / s, the number of scan 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 solution for preparation of BiOI thin films by electrodeposition is prepared as follows:

[0039] a. Weigh 3-3.5g of potassium iodide (KI) into a dry and clean beaker, add 40-60 mL of double distill...

Embodiment 2

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

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

[0053] (2) BiVO 4 The preparation of thin film: with embodiment 1;

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

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

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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 materials, especially a kind of BiVO loaded with magnetic nanoparticles NiS and CoS 4 The preparation of composite materials NiS / BiVO4 and CoS / BiVO4 is mainly used as a photoanode material for hydrogen evolution reaction. Background technique [0002] With increasing resource shortages, hydrogen energy is receiving widespread attention. Photoelectrochemical (PEC) cells have been uncovered as one of the highest profile routes to generate hydrogen. BiVO 4 As a typical n-type semiconductor, the band gap Eg is about 2.4eV, it has visible light activity, and it is used as a photoanode for hydrogen evolution reaction. 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 An efficient way to recombine photogenerated electrons and holes. Contents of the invention [00...

Claims

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Application Information

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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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