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Preparation method and application of Co-Pi/PDA/BiVO4 (cobalt phosphate/polydopamine/bismuth vanadium oxide) 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, easy recombination of photogenerated electron holes, restricting the performance of bismuth vanadate, etc. Good chemical stability, good repeatability, good photoelectrochemical performance

Active Publication Date: 2019-07-23
无锡智慧兴宜信息技术有限公司
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  • 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 Co-Pi/PDA/BiVO4 (cobalt phosphate/polydopamine/bismuth vanadium oxide) ternary composite photoelectrode
  • Preparation method and application of Co-Pi/PDA/BiVO4 (cobalt phosphate/polydopamine/bismuth vanadium oxide) ternary composite photoelectrode
  • Preparation method and application of Co-Pi/PDA/BiVO4 (cobalt phosphate/polydopamine/bismuth vanadium oxide) ternary composite photoelectrode

Examples

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 nanomaterials and relates to a composite photoelectrode, in particular to a preparation method of a Co-Pi / PDA / BiVO4 (cobalt phosphate / polydopamine / bismuth vanadium oxide) ternary composite photoelectrode. Firstly, a layer of uniform BiOI nanoparticles are grown on an FTO surface through electro-deposition, and BiVO4 is produced throughhigh-temperature calcination; PDA is grown on BiVO4 with a chemical water bath method, a Co-Pi catalyst promoter is introduced with PDA as a functional bridge, a PDA / BiVO4 electrode is soaked in a cobalt nitrate and sodium phosphate water solution with a chemical water bath method, the Co-Pi catalyst promoter is grown on PDA, and the Co-Pi / PDA / BiVO4 photoelectrode is prepared. The synthesis process is simple, the repeatability is good, used materials are cheap and easy to obtain and meet the environment-friendly requirement, and the Co-Pi / PDA / BiVO4 composite photoelectrode prepared with the simple electro-deposition, high-temperature calcination and chemical bath deposition method has good chemical stability and good photoelectrochemical properties and has the photoelectric conversion efficiency up to 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 Applications(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
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