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A method to enhance the photocatalytic performance of ferroelectric materials by regulating spontaneous polarization

A ferroelectric material and spontaneous polarization technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of lack of control means and achieve photocatalysis Effects of performance improvement and photocatalytic performance improvement

Active Publication Date: 2019-12-10
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the reports on regulating the spontaneous polarization of ferroelectric materials are limited to thin film materials and ceramic materials, and there are extremely few methods for regulating spontaneous polarization in powder materials.

Method used

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  • A method to enhance the photocatalytic performance of ferroelectric materials by regulating spontaneous polarization
  • A method to enhance the photocatalytic performance of ferroelectric materials by regulating spontaneous polarization
  • A method to enhance the photocatalytic performance of ferroelectric materials by regulating spontaneous polarization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Bismuth tungstate (Bi 2 WO 6 ) to enhance the photocatalytic performance, specifically:

[0030] 1) Dissolving the soluble polymer material polymethyl methacrylate (PMMA) in ethyl acetate, the addition ratio is 0.5g PMMA dissolved in 10mL ethyl acetate solvent, stirring evenly on a magnetic stirrer to prepare a clear solution;

[0031] 2) Add 1g Bi directly to the above mixed solution 2 WO 6 Powder, mix the mixture evenly under continuous stirring;

[0032] 3) Take a small amount of the above mixed solution, and evenly drop it on the cleaned ITO conductive glass substrate, or spin-coat it on the conductive glass substrate through a coater to prepare an organic film with a thickness of less than 1mm;

[0033] 4) Transfer the above insulating film to an oven at 60°C for drying for more than 15 minutes, so that the ethyl acetate is fully volatilized, and a flat insulating film is prepared;

[0034] 5) Prepare another piece of the same material, whose size is slightly ...

Embodiment 2

[0039] Bismuth ferrite (BiFeO) controlled by an external electric field 3 ) to enhance the photocatalytic performance, specifically:

[0040] 1) Dissolving the soluble polymer material polymethyl methacrylate (PMMA) in ethyl acetate, the addition ratio is 0.5g PMMA dissolved in 10mL ethyl acetate solvent, stirring evenly on a magnetic stirrer to prepare a clear solution;

[0041] 2) Add 1g BiFeO directly to the above mixed solution 3 Powder, mix the mixture evenly under continuous stirring;

[0042] 3) Take a small amount of the above mixed solution, and evenly drop it on the cleaned ITO conductive glass substrate, or spin-coat it on the conductive glass substrate through a coater to prepare an organic film with a thickness of less than 1mm;

[0043] 4) Transfer the above insulating film to an oven at 60°C for drying for more than 15 minutes, so that the ethyl acetate is fully volatilized, and a flat insulating film is prepared;

[0044] 5) Prepare another piece of the same...

Embodiment 3

[0048] Tuning barium titanate (BaTiO) by applying an electric field 3 ) to enhance the photocatalytic performance, specifically:

[0049] 1) Dissolving the soluble polymer material polymethyl methacrylate (PMMA) in ethyl acetate, the addition ratio is 0.5g PMMA dissolved in 10mL ethyl acetate solvent, stirring evenly on a magnetic stirrer to prepare a clear solution;

[0050] 2) Add 1g BaTiO directly to the above mixed solution 3 Powder, mix the mixture evenly under continuous stirring;

[0051] 3) Take a small amount of the above mixed solution, and evenly drop it on the cleaned ITO conductive glass substrate, or spin-coat it on the conductive glass substrate through a coater to prepare an organic film with a thickness of less than 1mm;

[0052] 4) Transfer the above insulating film to an oven at 60°C for drying for more than 15 minutes, so that the ethyl acetate is fully volatilized, and a flat insulating film is prepared;

[0053] 5) Prepare another piece of the same mat...

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Abstract

The invention relates to a method for enhancing photocatalysis performance of a ferroelectric material through regulation and control of spontaneous polarization, an insulation film is prepared by employing soluble high-molecular material-loaded ferroelectric material powder, spontaneous polarization intensity of the ferroelectric material can be adjusted by an applied electric field, photo-induced electron and cavity are effectively separated under effect of intrinsic polarization field, life of a photon-generated carrier is prolonged, so that a purpose of enhancing photocatalysis performance of the material can be achieved. Compared with the prior art, the method provides the simple and effective approach for enhancing the photocatalysis performance of the ferroelectric material (especially the ferroelectric powder material).

Description

technical field [0001] The invention relates to a method for enhancing the photocatalytic performance of ferroelectric materials, in particular to a method for enhancing the photocatalytic performance of ferroelectric materials by regulating spontaneous polarization. Background technique [0002] Photocatalytic technology has great application prospects in the fields of environmental purification, photolysis of water to produce hydrogen, and dye-sensitized solar cells. However, the solar energy conversion efficiency of existing photocatalysts is still relatively low, mainly due to the rapid recombination of photogenerated electrons and holes and the low rate of surface redox reactions. The rate of surface redox reaction depends on the lifetime of photogenerated carriers. Since carrier separation, diffusion and surface redox reactions must be carried out within the lifetime of photogenerated carriers, the recombination of photogenerated electrons and holes is a photocatalytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31B01J32/00B01J37/34C02F1/30C02F101/30
CPCB01J23/31B01J31/06B01J35/004B01J37/342C02F1/30C02F2101/308
Inventor 张刚华曾涛李精赵程付栖勇
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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