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Ag-Pi/BiVO4 heterojunction synthesis method and application thereof in photoelectrolysis of water

A heterogeneous combination and heterojunction technology, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of accelerated carrier transport, negative shift of initial potential, etc., to achieve improved utilization, good repeatability, and synthesis The effect of simple process

Inactive Publication Date: 2020-09-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simultaneously BiVO 4 The built-in field induced by Ag-Pi accelerates the transport of carriers in the bulk phase, resulting in a negative shift of the onset potential

Method used

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  • Ag-Pi/BiVO4 heterojunction synthesis method and application thereof in photoelectrolysis of water
  • Ag-Pi/BiVO4 heterojunction synthesis method and application thereof in photoelectrolysis of water
  • Ag-Pi/BiVO4 heterojunction synthesis method and application thereof in photoelectrolysis of water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of Ag-Pi / BiVO 4 A heterogeneous combination synthesis method, comprising the steps of:

[0029] A. Prepare 0.4 M KI and 0.04 M Bi(NO 3 ) 3 ·5H 2 O mixed aqueous solution, adjust the pH value to 1 with nitric acid, pour into the ethanol solution of p-benzoquinone, stir for 10min, obtain the BiOI precursor solution, wherein the volume ratio of the mixed aqueous solution and the ethanol solution of p-benzoquinone is 4:1; The concentration of the ethanol solution of p-benzoquinone is 1.68mol / L;

[0030] B. The precursor solution is placed in a three-electrode system, and BiOI is deposited on the FTO under the bias condition of -0.2 V vs Ag / AgCl. The deposition time is 4 minutes. The obtained BiOI film is washed with deionized water and dried at room temperature, wherein the three electrodes System: FTO is the working electrode, Ag / AgCl is the reference electrode, and Pt wire is the counter electrode;

[0031] C. Add 2 drops containing VO(acac) 2 DMSO solution o...

Embodiment 2

[0035] A kind of Ag-Pi / BiVO 4 A heterogeneous combination synthesis method, comprising the steps of:

[0036] A. Prepare 0.4 M KI and 0.04 M Bi(NO 3 ) 3 ·5H 2 O mixed aqueous solution, adjust the pH value to 1.7 with nitric acid, pour into the ethanol solution of p-benzoquinone, stir for 15min, obtain the BiOI precursor solution, wherein the volume ratio of the mixed aqueous solution and the ethanol solution of p-benzoquinone is 5:2; The concentration of the ethanol solution of p-benzoquinone is 0.23mol / L;

[0037] B. The precursor solution is placed in a three-electrode system, and BiOI is deposited on the FTO under the bias condition of -0.1 V vs Ag / AgCl, and the deposition time is 5min. The resulting BiOI film is washed with deionized water and dried at room temperature, wherein the three electrodes System: FTO is the working electrode, Ag / AgCl is the reference electrode, and Pt wire is the counter electrode;

[0038] C. Add 3 drops containing VO(acac) 2 DMSO solution...

Embodiment 3

[0042] A kind of Ag-Pi / BiVO 4 A heterogeneous combination synthesis method, comprising the steps of:

[0043] A. Prepare 0.4 M KI and 0.04 M Bi(NO 3 ) 3 ·5H 2 O mixed aqueous solution, adjust the pH value to 3 with nitric acid, pour into the ethanol solution of p-benzoquinone, stir for 25min, obtain the BiOI precursor solution, wherein the volume ratio of the mixed aqueous solution and the ethanol solution of p-benzoquinone is 7:4; The concentration of the ethanol solution of p-benzoquinone is 2.35mol / L;

[0044] B. The precursor solution is placed in a three-electrode system, and BiOI is deposited on FTO under the bias condition of -0.4V vs Ag / AgCl, and the deposition time is 6min. The obtained BiOI film is washed with deionized water and dried at room temperature, wherein the three electrodes System: FTO is the working electrode, Ag / AgCl is the reference electrode, and Pt wire is the counter electrode;

[0045] C. Add 2 drops containing VO(acac) 2 DMSO solution on the ...

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Abstract

The invention belongs to the technical field of nano material synthesis and relates to an Ag-Pi / BiVO4 heterojunction synthesis method. The preparation method comprises the following steps: firstly, growing a layer of BiOI nanoparticles on an FTO substrate by adopting an electro-deposition method; dropwise adding a mixed solution of vanadyl acetylacetonate and dimethyl sulfoxide on the surface of the FTO; carrying out high-temperature calcination to generate bismuth vanadate (BiVO4), carrying out a continuous ion adsorption reaction, sequentially soaking FTO in AgNO3, deionized water, Na2HPO4 and deionized water, and finally washing the FTO with deionized water to obtain the Ag-Pi / BiVO4 heterojunction. The heterojunction is used as a photoelectrode to be applied to photoelectrochemical hydrolysis reaction, wherein a cocatalyst, silver phosphate (Ag-Pi), is loaded on the wormlike nanostructure of bismuth vanadate (BiVO4), so that the photoresponse range, the charge injection efficiency and the charge separation efficiency of the photoelectrode are improved, and the sunlight utilization rate of the photoelectrode is improved. The material has the advantages of good chemical stabilityand good photoelectrochemical performance; the synthesis process is simple, the repeatability is good, the used materials are cheap and easy to obtain, and the environment-friendly requirement is met.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis, relates to heterogeneous combination synthesis, and in particular to a kind of Ag-Pi / BiVO 4 Heterocombination synthesis method and its application to photoelectrolysis of water. Background technique [0002] The earth is the home on which human beings depend for survival, and it contains all kinds of resources that human beings need for production and life. In recent years, due to the unrestrained development and excessive use of fossil fuels, the earth's environment has been seriously damaged. In order to solve this problem, human beings are working hard to develop and utilize green energy. This is the most important problem facing human beings at present. One of the challenges. [0003] Photoelectrochemical water splitting to produce hydrogen is an environmentally friendly and promising technology that can effectively convert solar energy into chemical energy, making full use o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C25B1/04
CPCC25B1/04Y02E60/36
Inventor 白红叶李霞刘友超高杨何宁
Owner JIANGSU UNIV
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