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Synthesis method of BiVO4-Ni/Co3O4 heterojunction and application of BiVO4-Ni/Co3O4 heterojunction to photoelectrochemical hydrolysis

A synthesis method and heterojunction technology, applied in the direction of electrolysis process, electrolysis components, chemical instruments and methods, etc., can solve the problems of limiting the hydrogen production efficiency of water decomposition, low photocurrent density, low charge separation efficiency, etc., and achieve low cost, Large reserves, the effect of inhibiting charge recombination

Inactive Publication Date: 2020-08-25
JIANGSU UNIV
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AI Technical Summary

Problems solved by technology

However, pure BiVO 4 Low photocurrent density due to low charge separation efficiency and slow water oxidation kinetics limits the theoretical efficiency of photoelectrochemical water splitting for hydrogen production

Method used

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  • Synthesis method of BiVO4-Ni/Co3O4 heterojunction and application of BiVO4-Ni/Co3O4 heterojunction to photoelectrochemical hydrolysis
  • Synthesis method of BiVO4-Ni/Co3O4 heterojunction and application of BiVO4-Ni/Co3O4 heterojunction to photoelectrochemical hydrolysis
  • Synthesis method of BiVO4-Ni/Co3O4 heterojunction and application of BiVO4-Ni/Co3O4 heterojunction to photoelectrochemical hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A BiVO 4 -Ni / Co 3 o 4 The synthetic method of heterojunction is carried out according to the following steps:

[0027] A. BiVO on FTO substrate 4 Photoanode, the BiVO prepared on the FTO substrate 4 The steps of the photoanode are: (1) first dissolve 3.32g KI with 50mL of deionized water, then, dissolve 0.9701g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution and stirred for 10 min, and nitric acid was added dropwise to adjust the pH to 1.0 to form a stable mixed solution A;

[0028] (2) Dissolve 0.4972g of p-benzoquinone in 20mL of absolute ethanol, seal the beaker and stir for 10min to obtain solution B;

[0029] (3) Solution B is slowly added to the above solution A and stirred for 10 minutes to form BiOI precursor solution C;

[0030] (4) A three-electrode system was adopted, with FTO as the working electrode, Pt wire as the counter electrode, and Ag / AgCl as the reference electrode. Under the bias voltage of -0.1V, a uniform dark red BiOI film was formed o...

Embodiment 2

[0038] A BiVO 4 -Ni / Co 3 o 4 The synthetic method of heterojunction is carried out according to the following steps:

[0039] A. BiVO on FTO substrate 4 Photoanode, the BiVO prepared on the FTO substrate 4 The steps of the photoanode are: (1) first dissolve 3.32g KI with 50mL of deionized water, then, dissolve 0.9701g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution and stirred for 10 minutes, and nitric acid was added dropwise to adjust the pH to 1.3 to form a stable mixed solution A;

[0040] (2) Dissolve 0.4972g of p-benzoquinone in 20mL of absolute ethanol, seal the beaker and stir for 10min to obtain solution B;

[0041] (3) Solution B is slowly added to the above solution A and stirred for 10 minutes to form BiOI precursor solution C;

[0042] (4) A three-electrode system was adopted, FTO was used as the working electrode, Pt wire was used as the counter electrode, and Ag / AgCl was used as the reference electrode. Under the bias voltage of -0.1V, a uniform dark...

Embodiment 3

[0050] A BiVO 4 -Ni / Co 3 o 4 The synthetic method of heterojunction is carried out according to the following steps:

[0051] A. BiVO on FTO substrate 4 Photoanode, the BiVO prepared on the FTO substrate 4 The steps of the photoanode are: (1) first dissolve 3.32g KI with 50mL of deionized water, then, dissolve 0.9701g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution and stirred for 10 min, and nitric acid was added dropwise to adjust the pH to 1.7 to form a stable mixed solution A;

[0052] (2) Dissolve 0.4972g of p-benzoquinone in 20mL of absolute ethanol, seal the beaker and stir for 10min to obtain solution B;

[0053] (3) Solution B is slowly added to the above solution A and stirred for 10 minutes to form BiOI precursor solution C;

[0054] (4) A three-electrode system was adopted, FTO was used as the working electrode, Pt wire was used as the counter electrode, and Ag / AgCl was used as the reference electrode. Under the bias voltage of -0.1V, a uniform dark red...

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Abstract

The invention belongs to the technical field of nano composite materials and relates to a synthesis method of a BiVO4-Ni / Co3O4 heterojunction. The synthesis method comprises the following steps of: growing a layer of BiOI nanoparticles on an FTO substrate by adopting an electro-deposition method; dropwise adding a vanadyl acetylacetonate aqueous solution on the surface of the FTO; performing calcining at a high temperature to generate bismuth vanadate (BiVO4); obliquely placing FTO in a deionized water solution containing Co (NO3) 2.6 H2O, Ni (NO3) 2.6 H2O, C6H12N4, CH4N2O and NH4F through continuous ion adsorption reaction; performing hydrothermal reaction at 120-200 DEG C for 2-5 hours, taking out an obtained product, cleaning the product with deionized water; annealing the product at 300-500 DEG C for 1.5-3 hours; and naturally cooling the product to room temperature to obtain the BiVO4-Ni / Co3O4 heterojunction. The prepared heterojunction is used as a photoelectrode to be applied tophotoelectrochemical hydrolysis reaction. According to the preparation method, a simple electro-deposition method and a hydrothermal method are utilized, therefore, the method is simple in operationand has good repeatability; the used materials are low in cost, large in reserves and non-toxic, and meets the requirement for environmental friendliness; the prepared material can significantly reduce the interface reaction barrier, effectively inhibit solid-liquid interface charge recombination, accelerate water oxidation reaction kinetics and improve the photocurrent density so as to better utilize solar energy.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanocomposite materials, relates to the synthesis of heterogeneous materials, and in particular to a kind of BiVO 4 -Ni / Co 3 o 4 Heterocombination synthesis method and its application to photoelectrolysis of water. Background technique [0002] The effective use of solar energy has always attracted much attention. Due to the depletion of fossil fuels and the serious pollution caused, human beings have to seek new clean energy sources. Using sunlight to split water to produce hydrogen is a very good strategy to meet the demand for clean energy in the future. [0003] In recent years, with BiVO 4 The representative bismuth-based semiconductors are widely used in the field of photoelectrochemical water splitting. Because of its low cost, stable chemical properties, and narrow band gap (2.4eV), it is favored by researchers. However, pure BiVO 4 The low photocurrent density due to low charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847C25B1/04C25B1/00C25B11/06
CPCB01J23/8472C25B1/04C25B1/55C25B11/091B01J35/33B01J35/39Y02E60/36Y02P20/133
Inventor 范伟强俞立豪白红叶高杨
Owner JIANGSU UNIV
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