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Semiconductor catalyst, and preparation method thereof, catalysis and hydrogen production system comprising semiconductor catalyst, and hydrogen production method

A kind of semiconductor and catalyst technology, applied in the field of semiconductor catalyst and its preparation, catalytic hydrogen production system including semiconductor catalyst and hydrogen production field

Active Publication Date: 2012-02-01
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But so far, there are no patents and literature reports that use photochemical methods to self-assemble to generate cavity structures and shapes under harsh conditions such as templates and calcinations. Efficient, stable, cheap, and easy to synthesize semiconductor catalytic photolysis of water to produce hydrogen catalyst approach

Method used

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  • Semiconductor catalyst, and preparation method thereof, catalysis and hydrogen production system comprising semiconductor catalyst, and hydrogen production method
  • Semiconductor catalyst, and preparation method thereof, catalysis and hydrogen production system comprising semiconductor catalyst, and hydrogen production method
  • Semiconductor catalyst, and preparation method thereof, catalysis and hydrogen production system comprising semiconductor catalyst, and hydrogen production method

Examples

Experimental program
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Embodiment 1

[0094]Using cadmium selenide quantum dots (as shown in Figure-3, with an average particle size of 2-7nm) as the substrate, cobalt dichloride as the doping compound, and vitamin C as the electron sacrificial body, irradiate the above with a 500W high-pressure mercury lamp For the multi-component aqueous solution, use a Pyrex test tube (which can transmit light with a wavelength > 280nm) as a reaction vessel, and use a 400nm glass filter.

[0095] Add 4ml of cadmium selenide quantum dots, 0.5mg of cobalt dichloride, 50mg of vitamin C, and 6ml of water into the Pyrex test tube, adjust the pH to 4.65 with 1mol / L sodium hydroxide, keep it in a sealed nitrogen atmosphere, and irradiate with visible light Glassware; during the reaction, use thermal conductivity-gas spectrometry to detect the hydrogen generated in the reaction (as shown in Figure-9), and the hydrogen production rate can reach 35μmol·h -1 ·mg -1 After the reaction, the centrifuge precipitates, washes the precipitate w...

Embodiment 2

[0098] With cadmium selenide quantum dots (the average particle size is 2-7nm) as the substrate, nickel dichloride as the doping compound, and vitamin C as the electron sacrificial body, irradiate the above-mentioned multi-component aqueous solution with a 500W high-pressure mercury lamp, use Pyrex tubes (transmitting light with a wavelength > 280nm) were used as reaction vessels, and 400nm glass filters were used.

[0099] Add 4ml of cadmium selenide quantum dots, 0.5mg of nickel dichloride, 50mg of vitamin C, and 6ml of water into the Pyrex test tube, adjust the pH to 4.65 with 1mol / L sodium hydroxide, keep it in a sealed nitrogen atmosphere, and irradiate with visible light Glassware; during the reaction, the hydrogen gas generated in the reaction is detected by thermal conductivity-gas spectroscopy, and the hydrogen production rate can reach 40μmol·h -1 ·mg -1 After the reaction, the centrifuge precipitates, washes the precipitate with water, and uses high-resolution tran...

Embodiment 3

[0101] With cadmium selenide quantum dots (average particle size of 2-7nm) as the substrate, Co III (dmgH) 2 pyCl (structure shown in the figure below) is a doping compound, vitamin C is an electron sacrificial body, irradiate the above multi-component aqueous solution with a 500W high-pressure mercury lamp, and use a Pyrex test tube (light with a wavelength > 280nm) as a reaction vessel. 400nm glass filter.

[0102]

[0103] Add 4ml cadmium selenide quantum dots to the Pyrex test tube, 1ml contains 0.81mgCo III (dmgH) 2 Acetonitrile solution of pyCl, 50mg vitamin C, 4ml acetonitrile, 1ml water, adjust the pH to 4.65 with 1mol / L sodium hydroxide, keep it in a sealed nitrogen atmosphere, and irradiate the glassware with visible light. During the reaction, the hydrogen gas generated in the reaction was detected by thermal conductivity-gas spectrometry, and the hydrogen production rate can reach 30 μmol h -1 ·mg -1 . After the reaction, the centrifuge precipitates, washe...

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Abstract

The invention discloses a semiconductor catalyst for a photocatalysis and hydrogen production system. The semiconductor catalyst comprises the following raw materials: cadmium selenide or cadmium sulfide quantum dots, and salts or coordination complexes of cobalt, nickel or ferric. In the method, a high-efficiency semiconductor catalyst is prepared from the cadmium selenide or cadmium sulfide quantum dots by a photochemical method, and water is subjected to photolysis in the presence of a sacrificial body so as to produce hydrogen; and the cadmium selenide or cadmium sulfide quantum dots are subjected to photoreaction through visible light drive so as to easily and quickly prepare the high-efficiency semiconductor catalyst in situ, and water is subjected to photolysis in the presence of the sacrificial body so as to produce hydrogen. Hydrogen production speed can reach 40 mu mol.h<-1>.mg<-1>(CdSe) and 25 mu mol.h<-1>.mg<-1> (CdS). In the method, the high-efficiency, stable and low-price semiconductor catalysis water photolysis hydrogen production catalyst which has a hollow structure and is easy to synthesize is generated in a self-assembly mode under illumination without severe conditions such as templates, calcination and the like and metal materials such as platinum, rhodium and the like; and the prepared catalyst can be recycled.

Description

technical field [0001] The invention relates to a semiconductor catalyst for a photocatalytic hydrogen production system and a preparation method, a photocatalytic hydrogen production system containing the catalyst and a method for preparing hydrogen. Background technique [0002] Until now, the main source of global energy still relies on fossil fuels. However, as a non-renewable energy source, fossil fuels cannot always meet the increasing energy needs of mankind. At the same time, the negative effects of using fossil fuels such as environmental pollution and climate change have attracted more and more attention. It is imminent to develop and utilize new environmentally friendly non-fossil energy sources. At present, the best alternative to fossil fuels is solar energy, because solar energy is an environmentally friendly and sustainable energy source. Therefore, the storage and utilization of solar energy has attracted much attention, and a research frenzy has been set ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J27/043C01B3/04
CPCY02E60/364Y02E60/36Y02P20/584
Inventor 吴骊珠李治军
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI