Method for preparing bimetal-organic framework/bismuth vanadate composite photoanode material

An organic framework and photoanode technology, applied in the field of BiVO4-based composite materials, can solve the problems of easy recombination, slow photo-generated carrier migration rate, and low photoelectric conversion efficiency.

Inactive Publication Date: 2019-06-14
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology

Compared with other semiconductor catalysts, bismuth vanadate (BiVO 4 ) has attracted much attention due to its suitable bandgap width (2.4-2.6 eV), stable chemical properties, non-toxic, environmentally friendly and cheap and easy to obtain, however BiVO 4 There are also some defects in the application of photocatalysis, such as the easy recombination of photogenerated electron-hole pairs and the slow migration rate of photogenerated carriers. These defects make BiVO 4 The photoelectric conversion efficiency is low, which limits its wide application

Method used

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  • Method for preparing bimetal-organic framework/bismuth vanadate composite photoanode material
  • Method for preparing bimetal-organic framework/bismuth vanadate composite photoanode material
  • Method for preparing bimetal-organic framework/bismuth vanadate composite photoanode material

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Embodiment Construction

[0032] Below through specific embodiment CoNi-MOFs / BiVO of the present invention 4 The preparation and properties are further explained.

[0033] 1. Preparation of BiVO4 photoanode

[0034] According to the method of electrodeposition combined with heat treatment by Kim and Choi's group, porous BiVO 4 The membrane was successfully prepared. Steps: First, BiOI nanosheets were prepared by electrodeposition using CHI 660D electrochemical workstation. FTO glass cleaned ultrasonically with acetone / isopropanol / distilled water (volume ratio: 1:1:1) was used as the working electrode, the Ag / AgCl (3.5 M KCl) electrode was used as the reference electrode, and the Pt electrode was used as the counter electrode. with 6M HNO 3 Adjust the pH of 50 mL0.4 M KI solution to 1.5~1.7, then add 0.970 g Bi(NO 3 ) 3 • 5H 2 O until dissolved and the solution color changed to orange-red. Then slowly add 20ml 0.498 g 1,4-benzoquinone ethanol solution dropwise and stir for several minutes, the s...

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Abstract

The invention provides a method for preparing a bimetal/organic framework/bismuth vanadate composite photoanode material. A metal framework NiCo-MOFs with a three-dimensional rhombic tetragonal structure is formed by a hydrothermal process in a mixed solution of N,N-dimethylformamide, anhydrous ethanol and distilled water with CoCl2.6H2O and NiCl2.6H2O as raw materials, phthalic acid as a ligand framework and a BiVO4 electrode as a matrix, and the metal framework NiCo-MOFs is loaded on a BiVO4 film to obtain the photoanode material NiCo-MOFs/BiVO4. The coupling effect of the bimetal center promotes the transfer of electrons from the organic ligand to the metal center in order to promote charge separation. Additionally, the three-dimensional rhombic tetragonal metal framework structure andthe sufficiently large contact area make lights effectively captured, the charge transfer resistance reduced and the rapid migration of carriers accelerated, so the recombination of electron hole pairs is inhibited, thereby the electrochemical performances of BiVO4 are effectively improved.

Description

technical field [0001] The present invention relates to a BiVO 4 A matrix composite material, in particular to a preparation method of a bimetallic-organic framework / bismuth vanadate composite material, which is mainly used as a photoelectric anode material for photoelectrochemical water splitting hydrogen production reaction. Background technique [0002] With the rapid development of economy and society, the human demand for fossil energy is increasing, and the phenomenon of excessive consumption of fossil energy is becoming more and more serious. Excessive consumption of fossil energy will cause energy shortage and bring a series of environmental problems , such as the depletion of fossil energy, environmental pollution, exhaust emissions and so on. In the face of serious energy shortage and environmental pollution, it is urgent to develop new clean and renewable energy to replace fossil energy. Replacing fossil energy with clean and renewable energy has always been a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/36C25B1/04C25B11/06
CPCY02E60/36
Inventor 周诗仟王其召黄静伟佘厚德王磊
Owner NORTHWEST NORMAL UNIVERSITY
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