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WO3/BiVO4/FeOOH ternary system composite material and preparation method and application thereof

A technology of composite materials and ternary systems, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as limited applications, and achieve good repeatability and process Simple and controllable, the effect of photocatalytic performance improvement

Active Publication Date: 2018-12-28
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, affecting BiVO 4 The main factors of photoanode conversion efficiency are limited light absorption capacity, charge separation efficiency and surface charge transfer capacity, which greatly limit its application in photoelectrocatalysis.

Method used

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  • WO3/BiVO4/FeOOH ternary system composite material and preparation method and application thereof
  • WO3/BiVO4/FeOOH ternary system composite material and preparation method and application thereof
  • WO3/BiVO4/FeOOH ternary system composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 0.1g polyvinylpyrrolidone (PVP) and 0.02g tungsten hexachloride (WCl 6 ) was dissolved in 10 ml of dimethylformamide (DMF), and stirred at room temperature for 1 hour to obtain a spin coating liquid. Spin-coat 20 microliters on the conductive surface of FTO conductive glass at a speed of 2000 rpm, dry at 80°C for 3 hours, and anneal at 500°C in a muffle furnace for 1 hour to form WO 3 film substrate. figure 1 For the obtained WO 3 Scanning electron microscope (SEM) picture of the film substrate, it can be seen that WO 3 The particles are about 50nm and densely covered on the FTO conductive surface. figure 2 For the obtained WO 3 Cross-sectional scanning electron microscopy (SEM) of the film substrate, showing that WO 3 The thickness of the film substrate is about 35 nm.

[0047] 0.5g PVP, 2.468g Bi(NO 3 ) 3 ·5H 2 O, 1.337g VO(acac) 2 and 1g DIPA were dissolved in 2gDMF, 3g glacial acetic acid and 1g absolute ethanol, stirred and mixed at room temperatur...

Embodiment 2

[0050] The only difference from Example 1 is that in this example BiVO 4 The spinning time of the layer is 10 minutes, and the other processes are the same as in Example 1, and will not be repeated here. prepared WO 3 / BiVO 4 / FeOOH ternary system composite cross-sectional scanning electron microscope (SEM) such as Figure 9 shown, indicating that BiVO 4 The thickness is 300nm.

Embodiment 3

[0052] The only difference from Example 1 is that in this example BiVO 4 The spinning time of the layer is 20 minutes, and the other processes are the same as in Example 1, and will not be repeated here. prepared WO 3 / BiVO 4 / FeOOH ternary system composite cross-sectional scanning electron microscope (SEM) such as Figure 10 shown, indicating that BiVO 4 The thickness is 1800nm.

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Abstract

The invention relates to a WO3 / BiVO4 / FeOOH ternary system composite material and a preparation method thereof and application in photoelectrocatalysis, and belongs to the field of the photoelectrocatalysis. The WO3 / BiVO4 / FeOOH ternary system composite material is prepared from monoclinic phase WO3, monocline BiVO4 and amorphous state FeOOH. The WO3 covers the bottom layer, the BiVO4 covers the WO3, the FeOOH wraps the outermost layer, wherein the mass of the BiVO4 is 85-95% of the total mass of the WO3 / BiVO4 / FeOOH ternary system composite material. The WO3 / BiVO4 / FeOOH ternary system compositematerial and the preparation method thereof and the application in photoelectrocatalysis have the advantages that WO3 / porous BiVO4 is utilized to construct efficient heterojunction, FeOOH serves as acatalyst promoter, the photoelectrocatalytic performance is improved in multiple aspects, and the WO3 / BiVO4 / FeOOH ternary system composite material can be effectively applied in photoelectrocatalysisand has high efficiency and stability.

Description

technical field [0001] The present invention relates to WO 3 / BiVO 4 The invention relates to a / FeOOH ternary system composite material, a preparation method thereof, and an application in photoelectric catalysis, belonging to the field of photoelectric catalysis. Background technique [0002] Increasing social demands have brought many challenges to electricity and energy, such as improving energy efficiency, developing new energy sources, and protecting the environment. Hydrogen energy is considered as an ideal energy carrier because of its cleanness, renewable, extensive resources, and high energy density. Semiconductor materials can convert solar energy into chemical energy through photoelectrochemical (PEC) water splitting, which has attracted extensive attention. [0003] BiVO 4 It has a narrow band gap (~2.4eV), suitable energy band structure, excellent stability and low cost. There are potential applications. However, affecting BiVO 4 The main factors of phot...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J35/10B01J37/00C25B11/06C25B1/04
CPCC25B1/04B01J23/888B01J37/0018B01J2523/00C25B11/091B01J35/60B01J35/39B01J2523/54B01J2523/55B01J2523/69Y02E60/36
Inventor 侯慧林马自在杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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