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Tungsten-manganese-calcium/mesoporous tungsten trioxide composite that can be used to prepare photoanode and preparation method thereof

A tungsten trioxide, calcium oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve high photocatalytic activity and stability, wide light response range , good catalytic activity and stability

Active Publication Date: 2019-11-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preparing an island-shaped tungsten-manganese-calcium ternary compound formed on the surface of mesoporous tungsten trioxide by compounding mesoporous tungsten trioxide and layered manganese-calcium oxide; the ternary composite semiconductor catalyst and corresponding Compared with the single-component catalysts, the defects of single catalysts are overcome by the combination of manganese-calcium and tungsten oxide, and it has the advantages of high charge separation efficiency, small oxygen evolution overpotential, good catalytic activity and stability, etc. It is a promising Preparation of Novel Catalytic Materials for Photochemical Cell Photoanodes

Method used

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  • Tungsten-manganese-calcium/mesoporous tungsten trioxide composite that can be used to prepare photoanode and preparation method thereof
  • Tungsten-manganese-calcium/mesoporous tungsten trioxide composite that can be used to prepare photoanode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 12g of phosphotungstic acid, 8g of KIT-6 and 200 mL of absolute ethanol were mixed, stirred magnetically for 2 h, and centrifuged. The solid was washed several times with deionized water and dried at 60°C for 10 h. Calcined at 550 °C for 5 h and cooled to room temperature naturally. Disperse the obtained pale yellow solid into 200 mL hydrofluoric acid (2mol / L) and stir for 6 hours, then centrifuge. The solid was washed several times with deionized water and dried in vacuum to obtain mesoporous tungsten trioxide.

[0039] Dissolve 1.2g of calcium acetate monohydrate and 3.98g of manganese acetate tetrahydrate in 30mL of deionized water, and slowly add 30mL of KOH (8.6 mol / L) aqueous solution under magnetic stirring to obtain a brown suspension. Add 100 mL KMnO dropwise to the suspension 4 Aqueous solution (0.06 mol / L), magnetically stirred at room temperature for 8 hours, centrifuged, the solid was washed several times with deionized water, dried in vacuum, and then ca...

Embodiment 2

[0044] Add 1.9g of mesoporous tungsten trioxide and 0.10g of layered manganese-calcium oxide into a 50 mL ball mill jar, and grind on a star ball mill at 500 rpm for 4 hours, and the rest of the steps are the same as in Example 1. A porous tungsten trioxide photocatalytic material with island-like tungsten-manganese-calcium complexes on the surface was prepared, in which the mass fraction of manganese-calcium oxide was 5 wt.%. The photoanode preparation, photocatalytic reactor and photocatalytic reaction conditions are also the same as those in Example 1. After light reaction for 2 hours, when the applied voltage was 0.9V vs. RHE, the yields of hydrogen and oxygen were 1.1 and 0.4 µmol respectively; when the applied voltage was 1.0 V vs. RHE, the yields of hydrogen and oxygen were 2.0 and 0.9 µmol respectively; the applied voltage was 1.1 When V vs. RHE, the production of hydrogen and oxygen are 2.5 and 1.1 μmol, respectively; when the applied voltage is 1.2V vs. RHE, the prod...

Embodiment 3

[0046] After mixing 1.2g of phosphotungstic acid, 2.4g of KIT-6 and 30mL of absolute ethanol, stir magnetically for 2 hours, and centrifuge. The solid is washed several times with deionized water and dried at 60°C for 10 hours. Calcined at 400 °C for 5 h and cooled to room temperature naturally. The obtained pale yellow solid was dispersed into 20 mL of hydrofluoric acid (2mol / L), stirred for 6 hours, and centrifuged. The solid was washed several times with deionized water and dried in vacuum to obtain mesoporous tungsten trioxide. Add 1.86g of mesoporous tungsten trioxide obtained by this method and 0.14g of layered calcium manganese oxide prepared by the method in Example 1 into a 50 mL ball mill jar, and grind for 4 hours on a star ball mill at 500 rpm. One method is to prepare a porous tungsten trioxide photocatalytic material with island-shaped tungsten-manganese-calcium composites on the surface. The mass fraction of manganese-calcium oxide is 7 wt.%. The photoanode pr...

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Abstract

The invention discloses a calcium tungsten manganese / mesoporous tungsten trioxide composite that can be used to prepare a photoanode and a preparation method thereof. The calcium tungsten manganese / mesoporous tungsten trioxide composite includes mesoporous tungsten trioxide and calcium manganese. Oxide. Mesoporous tungsten trioxide has a short electron migration distance, and island-shaped tungsten manganese calcium oxide serves as an oxygen-generating active center site and has a low oxygen evolution potential. Therefore, the photoanode made of this composite has a high light intensity. Catalytic oxygen production activity. Compared with the corresponding single-component catalyst, this ternary composite semiconductor catalyst overcomes the shortcomings of a single catalyst through the combination of calcium manganese and tungsten oxide, and has high charge separation efficiency, small oxygen evolution overpotential, and good catalytic activity and stability. With other advantages, it is a promising new catalytic material for preparing photoanode of photochemical cells.

Description

technical field [0001] The invention relates to a ternary composite catalyst, in particular to a photoanode material catalyst which can be used to prepare a photocatalytic water photochemical pool and a preparation method thereof. Background technique [0002] Hydrogen is a clean energy source with high calorific value, environmental friendliness, and convenient transportation. The product of combustion is water, which does not cause any harm to the environment. Water is abundant, readily available, and inexpensive on Earth. Catalytic water splitting to produce hydrogen and oxygen under sunlight irradiation is an ideal way to convert solar energy into chemical energy. The photocatalytic water splitting reaction with industrial practical value is carried out in the photoelectrochemical cell. The water splitting reaction of the photoelectrochemical cell includes two half-reactions, the reduction reaction of photocathode water and the oxidation reaction of photoanode water. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34C25B1/04C25B11/06
CPCC25B1/04B01J23/002B01J23/34B01J2523/00C25B1/55C25B11/091B01J35/50B01J35/33B01J35/39B01J2523/23B01J2523/69B01J2523/72Y02E60/36Y02P20/133
Inventor 杨平李科珍刘爱娟杜玉扣
Owner SUZHOU UNIV
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