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Efficient photocatalytic-water-splitting hydrogen production catalyst and preparation method thereof

A technology of photocatalysis and catalyst, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve the problem of low efficiency of photocatalytic decomposition of water to produce hydrogen, meet the requirements of industrialization, improve efficiency, and increase speed Effect

Active Publication Date: 2015-12-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of extremely low efficiency of photocatalytic decomposition of water for hydrogen production in titanium dioxide catalysts in the prior art, the present invention has carried out in-depth research on the mechanism of titanium dioxide photocatalytic decomposition of water for hydrogen production. this invention

Method used

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  • Efficient photocatalytic-water-splitting hydrogen production catalyst and preparation method thereof
  • Efficient photocatalytic-water-splitting hydrogen production catalyst and preparation method thereof
  • Efficient photocatalytic-water-splitting hydrogen production catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Get 0.4689 grams of copper nitrate and put it into a 250 milliliter beaker and stir for 10 minutes, then add 100 milliliters of sodium hydroxide solution of 0.25 moles per liter under continuous stirring, and continue to stir for 2 hours;

[0027] (2) Wash and centrifuge the suspension in step (1) 3 times with deionized water, wash and centrifuge 2 times with ethanol, pour off the supernatant and put it into an oven at 80 degrees Celsius to dry for 12 hours;

[0028] (3) Grinding the dried product of step (2) and sodium hypophosphite (the quality of sodium hypophosphite: the quality of the dried product of step (2)=5:1) in a mortar;

[0029] (4) get the product of step (3) gained and put into the tubular furnace with nitrogen protection device and roast 1 hour under the condition of 300 degree;

[0030] (5) the product after step (4) roasting is washed with deionized water and centrifuged 3 times, and ethanol is washed and centrifuged 2 times to obtain the product c...

Embodiment 2

[0036] Step (1)~(8) is the same as embodiment 1, the product (pure phase titanium dioxide (TiO2) in step (8) 2 ) nanocrystals and the product (pure phase copper phosphide (Cu 3 P) The mass ratio is (mass of titanium dioxide: mass of copper phosphide = 100:0.125), grind in a mortar for 45 minutes and mix evenly to obtain a sample of 0.125wt% Cu 3 P / TiO 2 ; 0.1 gram of the catalyst, 90 milliliters of water, and 10 milliliters of triethanolamine with a mass fraction of 99.5% were mixed to form a uniform suspension, which was tested by the Beijing Pufferai Optical Hydrogen Production System and the Shimadzu GC-81 chromatograph. The photocatalytic water splitting rate of the photocatalytic water splitting agent prepared by the present invention is 7.149mmolh -1 g -1 , 0.74mmolh hydrogen production rate than pure titanium dioxide -1 g -1 There has been a significant improvement, and the improvement effect has exceeded 9 times.

Embodiment 3

[0038] Step (1)~(8) is the same as embodiment 1, the product (pure phase titanium dioxide (TiO2) in step (8) 2 ) nanocrystals and the product (pure phase copper phosphide (Cu 3 P) The mass ratio is (mass of titanium dioxide: mass of copper phosphide = 100:0.5), grind in a mortar for 45 minutes and mix evenly to obtain a sample of 0.5wt% Cu 3 P / TiO 2 ; 0.1 gram of the catalyst, 90 milliliters of water, and 10 milliliters of triethanolamine with a mass fraction of 99.5% were mixed to form a uniform suspension, which was tested by the Beijing Pufferai Optical Hydrogen Production System and the Shimadzu GC-81 chromatograph. The photocatalytic water splitting rate of the photocatalytic water splitting agent prepared by the present invention is 7.939mmolh -1 g -1 , 0.74mmolh hydrogen production rate than pure titanium dioxide -1 g -1 There has been a significant improvement, and the improvement effect has exceeded 10 times.

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Abstract

The invention discloses a copper phosphide and titanium dioxide nanocrystalline compound-type photocatalytic-water-splitting hydrogen production catalyst and a preparation method thereof, and belongs to the technical field of nano-catalysts. The preparation method includes the steps that copper nitrate is prepared into copper hydroxide, copper hydroxide and sodium hypophosphite are calcined at certain temperature and under nitrogen protection, and then a product is rinsed, centrifuged and dried to obtain product copper phosphide; then, copper phosphide and anatase titanium dioxide nanocrystals are mixed and ground evenly to obtain the catalyst through preparation. The reaction rate of photocatalytic-water-splitting hydrogen production can be increased to 7.94 mmol h<-1>g<-1> from 0.74 mmol h<-1>g<-1> of pure titanium dioxide, and is increased by over 10 times. In this way, the catalyst is used as a new technological means for solving energy crisis, having potential industry applicability and producing environmentally-friendly novel energy.

Description

technical field [0001] The invention belongs to the technical field of nano-catalysts, and in particular relates to a copper phosphide-titanium dioxide nano-crystal composite photocatalytic hydrogen production catalyst for decomposing water and a preparation method thereof. Background technique [0002] Titanium dioxide is a material with excellent photocatalytic performance. It is not only non-toxic but also relatively cheap. The source of raw materials is very rich. It has a high abundance in the earth and its whiteness is very high. It is a semiconductor material with excellent performance. It is the most widely used material in the field of hydrogen production by photolysis of water. It is an ideal material to solve the energy crisis and generate clean energy. However, the actual situation is that titanium dioxide is used as a photocatalyst for water splitting. Its photocatalytic water splitting efficiency is extremely low, and it is difficult to meet the requirements of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18C01B3/04
CPCY02E60/36
Inventor 张宗弢岳新政王润伟易莎莎
Owner JILIN UNIV
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