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Preparation method and application of cobalt phosphate-polydopamine-bismuth vanadate ternary composite photoelectrode

A polydopamine, ternary composite technology, applied in electrodes, chemical instruments and methods, electrolytic components, etc., can solve the problems of slow water oxidation kinetics, restricting the performance of bismuth vanadate, and easy recombination of photogenerated electron holes, etc. Good chemical stability, good photoelectrochemical performance, good repeatability

Active Publication Date: 2020-12-18
无锡智慧兴宜信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bismuth vanadate (BiVO 4 ) is a semiconductor material with visible light response. However, bismuth vanadate has the problems of easy recombination of photogenerated electrons and holes and slow water oxidation kinetics, which seriously restricts the performance of bismuth vanadate in the field of PEC water splitting and hydrogen production.

Method used

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  • Preparation method and application of cobalt phosphate-polydopamine-bismuth vanadate ternary composite photoelectrode
  • Preparation method and application of cobalt phosphate-polydopamine-bismuth vanadate ternary composite photoelectrode
  • Preparation method and application of cobalt phosphate-polydopamine-bismuth vanadate ternary composite photoelectrode

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of cobalt phosphate-polydopamine-bismuth vanadate (Co-Pi / PDA / BiVO 4 ) A preparation method for a ternary composite photoelectrode, comprising the steps of:

[0032] (1) Dissolve 3.32 g KI in 50 ml deionized water, add 0.9701 g Bi(NO 3 ) 3 ·5H 2 0, drop nitric acid to adjust the pH to 1.2 to obtain a mixed solution;

[0033] (2) Dissolve 0.7514 g of p-benzoquine in 20 ml of absolute ethanol and stir to dissolve. The two solutions were mixed and stirred vigorously for 10 minutes to obtain a BiOI solution;

[0034] (3) Electrodeposition is carried out through the three-electrode system of the electrochemical workstation, specifically, FTO is used as the working electrode, Pt wire is used as the counter electrode, and Ag / AgCl is used as the reference electrode. BiOI was electrodeposited on the FTO for 5 min with an applied bias of -0.1V. Then, the BiOI surface was rinsed with deionized water and dried at room temperature;

[0035] (4) Drop 2 drops of 0.1 mol / L d...

Embodiment 2

[0040] A kind of cobalt phosphate-polydopamine-bismuth vanadate (Co-Pi / PDA / BiVO 4 ) A preparation method for a ternary composite photoelectrode, comprising the steps of:

[0041] (1) Dissolve 3.32 g KI in 50 ml deionized water, add 0.9701 g Bi(NO 3 ) 3 ·5H 2 0, drop nitric acid to adjust the pH to 1.7 to obtain a mixed solution;

[0042] (2) Dissolve 1.001 g of p-benzoquinone in 20 ml of absolute ethanol and stir to dissolve. The two solutions were mixed and stirred vigorously for 10 minutes to obtain a BiOI solution;

[0043] (3) Electrodeposition is carried out through the three-electrode system of the electrochemical workstation, specifically, FTO is used as the working electrode, Pt wire is used as the counter electrode, and Ag / AgCl is used as the reference electrode. BiOI was electrodeposited on the FTO for 5 min with an applied bias of -0.1V. Then, the BiOI surface was rinsed with deionized water and dried at room temperature;

[0044] (4) Drop 2 drops of 0.2 mol / ...

Embodiment 3

[0049] A kind of cobalt phosphate-polydopamine-bismuth vanadate (Co-Pi / PDA / BiVO 4 ) A preparation method for a ternary composite photoelectrode, comprising the steps of:

[0050] (1) Dissolve 3.32 g KI in 50 ml deionized water, add 0.9701 g Bi(NO 3 ) 3 ·5H 2 0, drop nitric acid to adjust the pH to 2.0 to obtain a mixed solution;

[0051] (2) Dissolve 1.10 g of p-benzoquinone in 20 ml of absolute ethanol and stir to dissolve. The two solutions were mixed and stirred vigorously for 10 minutes to obtain a BiOI solution;

[0052] (3) Electrodeposition is carried out through the three-electrode system of the electrochemical workstation, specifically, FTO is used as the working electrode, Pt wire is used as the counter electrode, and Ag / AgCl is used as the reference electrode. BiOI was electrodeposited on FTO for 5 min with an applied bias of -0.1 V. Then, the BiOI surface was rinsed with deionized water and dried at room temperature;

[0053] (4) Add 0.3 mol / L dimethyl sulfo...

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Abstract

The invention belongs to the technical field of photoelectrode nanomaterial synthesis, relates to composite photoelectrodes, and particularly relates to a cobalt phosphate-polydopamine-bismuth vanadate (Co-Pi / PDA / BiVO 4 ) Preparation method of ternary composite photoelectrode. The invention first uses electrodeposition to grow a layer of uniform BiOI nanoparticles on the surface of FTO, and then calcines it at high temperature to generate bismuth vanadate; it uses a chemical water bath method to grow polydopamine (PDA) on bismuth vanadate, and at the same time, PDA is used as a functional bridge to introduce phosphoric acid. Cobalt cocatalyst, PDA / BiVO 4 The electrode is immersed in an aqueous solution of cobalt nitrate and sodium phosphate, and a cobalt phosphate cocatalyst is grown on polydopamine to prepare a cobalt phosphate-polydopamine-bismuth vanadate photoelectrode. The synthesis process of the invention is simple, has good repeatability, the materials used are cheap and easily available, and meets the requirements of environmental friendliness. Co‑Pi / PDA / BiVO is prepared by simple electrodeposition, high-temperature calcination and chemical bath deposition. 4 The composite photoelectrode has good chemical stability, good photoelectrochemical performance, and photoelectric conversion efficiency as high as 27%.

Description

technical field [0001] The invention belongs to the technical field of photoelectrode nanomaterial synthesis, and relates to a composite photoelectrode, in particular to a cobalt phosphate-polydopamine-bismuth vanadate (Co-Pi / PDA / BiVO 4 ) Preparation method and application of ternary composite photoelectrode. Background technique [0002] With the growth of population, the unreasonable development of fossil fuels, the environmental and energy crisis is becoming more and more serious, and human beings have clearly realized the sense of crisis and necessity of developing clean energy. Therefore, the development and utilization of green energy has become the only way for human sustainable development. [0003] Photoelectrochemical water splitting for hydrogen production is an environmentally friendly green energy development path. The environmental protection of hydrogen and the abundant reserves of water and sunlight indicate that photoelectrochemical water splitting for hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06C25D9/04B01J31/36B01J35/00
CPCC25B1/04C25D9/04B01J31/36C25B11/095B01J35/33Y02E60/36Y02P20/133
Inventor 白红叶高杨范伟强白亚杰崔伟成孙东甜刘颖
Owner 无锡智慧兴宜信息技术有限公司