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Double metal hydroxide-composited porous bismuth vanadate photo-electrode and preparation method thereof

A hydroxide and bimetal technology, applied in electrodes, electrode shapes/types, electrolytic components, etc., can solve the problems of weak charge conductivity and high surface reaction energy barrier of bismuth vanadate, and improve energy utilization efficiency and cost. The effect of low and good electrocatalytic properties

Active Publication Date: 2015-11-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weak charge conduction performance and high surface reaction energy barrier of bismuth vanadate become the bottleneck restricting its performance improvement.

Method used

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  • Double metal hydroxide-composited porous bismuth vanadate photo-electrode and preparation method thereof
  • Double metal hydroxide-composited porous bismuth vanadate photo-electrode and preparation method thereof
  • Double metal hydroxide-composited porous bismuth vanadate photo-electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Weigh 0.4851gBi (NO 3 ) 3 ·5H 2 O, 0.8925gZn(NO 3 ) 2 ·6H 2 O was added to a mixed solution of 50mL deionized water and 100mL ethylene glycol to prepare a mixed salt solution;

[0026] B. Use acetone: isopropanol: water = 1:1:1 volume ratio solution to ultrasonically clean FTO (fluorine-doped SnO 2 conductive glass) conductive glass sheet, and naturally dry the conductive glass sheet; the mixed salt solution of step A is transferred to the three-electrode electrolytic cell, with the conductive glass substrate as the working electrode, wherein the working area of ​​the conductive glass sheet is 2cm 2 . With Ag / AgCl as the reference electrode, platinum wire as the counter electrode, and the electrolytic cell as a single-chamber electrolytic cell, an electrochemical workstation is used to apply a constant negative potential of 0.01V to the working electrode, and the total charge of electrodeposition is -8.35×10 -2 C·cm -2 . Take out the deposited electrode, was...

Embodiment 2

[0031] A. Weigh 0.4851gBi(NO 3 ) 3 ·5H 2 O, 0.595gZn(NO 3 ) 2 ·6H 2 O was added to a mixed solution of 50mL deionized water and 100mL ethylene glycol to prepare a mixed salt solution;

[0032] B is the same as embodiment 1, and the difference is that the working area of ​​the conductive glass is 1.5cm 2 , the total deposited charge of electrodeposition is -10×10 -2 C·cm -2

[0033] C. Weigh 0.1393g vanadium acetylacetonate and dissolve it in 2mL dimethyl sulfoxide, add 150μL of the solution dropwise to the electrode sheet obtained in step B, then calcinate in a muffle furnace at 450°C for 2 hours, and wait until the temperature drops to room temperature Take it out; weigh 4g NaOH, dissolve it in 100mL deionized water, add the calcined electrode sheet in step C, stir gently for 1 hour, take out the electrode sheet, rinse it with deionized water, and dry it at 70°C for 0.5 hour to obtain a porous BiVO 4 An electrode with an average particle size of 260nm and a pore siz...

Embodiment 3

[0037] A. Weigh 0.4851gBi (NO 3 ) 3 ·5H 2 O, 0.2975gZn(NO 3 ) 2 ·6H 2 O was added to a mixed solution of 50mL deionized water and 100mL ethylene glycol to prepare a mixed salt solution;

[0038] B is the same as Example 1, except that the constant negative potential used for electrodeposition is-0.18V, and the total deposition charge of electrodeposition is-9×10 -2 C·cm -2

[0039] C. Weigh 0.1393g of vanadium acetylacetonate and dissolve it in 2mL of dimethyl sulfoxide, add 200μL of the solution dropwise to the electrode sheet obtained in step B, then calcinate in a muffle furnace at 450°C for 3 hours, and wait until the temperature drops to room temperature Take it out; weigh 4g NaOH, dissolve it in 100mL deionized water, add the calcined electrode sheet in step C, stir gently for 1 hour, take out the electrode sheet, rinse it with deionized water, and dry it at 70°C for 0.5 hour to obtain a porous BiVO 4 An electrode with an average particle size of 236nm and a por...

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Abstract

The invention provides a double metal hydroxide-composited porous bismuth vanadate photo-electrode and a preparation method thereof, wherein a composite of Co-Al double metal hydroxide and bismuth vanadate is grown on the surface of an electric-conductive glass substrate. The pore size of the bismuth vanadate is 50-120 nm and the particle size of the bismuth vanadate is 200-300 nm. The Co-Al double metal hydroxide is grown on the bismuth vanadate particles with the thickness being 10-100 nm. The preparation method includes following steps: 1) preparing a porous bismuth vanadate electrode through an electro-deposition precursor method; and 2) growing the Co-Al double metal hydroxide on the porous bismuth vanadate electrode. The method is simple in operation and is mild in reaction conditions. With zinc ion as an electro-deposition additive for controlling the size and appearance of the bismuth vanadate electrode, the method is more green and environment-friendly compared with a method in the prior art with an organic template agent or organic additives, so that the method is suitable for large-scale production. The photo-electrode can be directly used in photo-electro-chemical water oxidizing catalytic reaction. Because of excellent catalytic performance and visible light absorption capability of the Co-Al double metal hydroxide, the photo-electrode is significantly improved in water oxidizing performance.

Description

technical field [0001] The invention belongs to the field of preparation of photoelectrode materials, in particular to a double metal hydroxide composite porous bismuth vanadate photoelectrode and a preparation method thereof, and is used for photoelectric catalytic water splitting driven by sunlight. Background technique [0002] The excessive development and use of traditional energy sources such as coal, oil and natural gas in modern society has caused a huge energy crisis and environmental pollution problems. In order to achieve sustainable development, the development and utilization of renewable energy industry has become an important strategic goal of all countries in the world. Among them, solar energy, as a clean renewable energy source, has tens of thousands of times the reserves of other renewable energy sources; at the same time, solar energy hardly releases CO during use. 2 Greenhouse gases such as solar energy can help alleviate environmental problems such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/04C25B1/04
CPCY02E60/36
Inventor 项顼何宛虹周辰
Owner BEIJING UNIV OF CHEM TECH
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