Controllable preparation of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst and application of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst to hydrogen production through water decomposition

A photocatalyst and three-dimensional dendritic technology, which is applied in the field of three-dimensional dendritic red phosphorus single-substance photocatalysts, can solve the problems of complex photocatalytic material systems and compositions

Pending Publication Date: 2022-05-13
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

Although many photocatalysts with excellent performance have been developed, the system and composition of most photocatalytic materials are too complicated

Method used

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  • Controllable preparation of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst and application of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst to hydrogen production through water decomposition
  • Controllable preparation of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst and application of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst to hydrogen production through water decomposition
  • Controllable preparation of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst and application of composite crystal three-dimensional dendritic red phosphorus elementary substance photocatalyst to hydrogen production through water decomposition

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Purification of commercial RP. Weigh 2g of commercial RP into a beaker, add 60mL of distilled water, and stir magnetically for 1 hour; put the above solution into a polytetrafluoroethylene-lined autoclave (100mL) and heat in an oven at 200°C for 12h ; Centrifugation, washing and drying to obtain purified RP.

Embodiment 2

[0022] Embodiment 2: Preparation of DRP photocatalyst (CVD method). Weigh 200 mg of purified commercial RP, mix them uniformly with metal Bi (50, 100, 200 and 400 mg) of different qualities, press into tablets, put them into different quartz ampoules, vacuumize and seal with acetylene flame; Quartz ampoules were placed in a tube furnace at 5°C min -1 The temperature was raised to 580°C at the rate of 2h, and then at 0.1°Cmin -1 Cool down to 300°C at a rate of 1°C min -1 rate down to room temperature. The samples were taken out and treated with carbon disulfide (CS 2 ), distilled water and washed several times to remove by-products; the sample aqueous solution was ultrasonically treated for 2 h and left to stand for 1 h to remove the black precipitate (metal Bi); after centrifugation and drying, the final product DRP photocatalyst was obtained.

[0023] The raw materials used in the invention are cheap and easy to obtain, the preparation process is simple, and the crystal f...

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Abstract

The invention discloses controllable preparation of a composite crystal form three-dimensional dendritic red phosphorus elementary substance photocatalyst and application of hydrogen production through water decomposition, and belongs to the technical field of catalysts. A controllable preparation process of chemical vapor deposition (CVD) is adopted, amorphous red phosphorus (RP) is used as a precursor, and under the participation of a metal bismuth (Bi) cocatalyst, the three-dimensional dendritic red phosphorus simple substance photocatalyst (DRP) with a composite crystal structure is successfully prepared. The DRP photocatalyst is composed of an RP nanowire ('trunk ') in a Hittorf crystal form and an RP nanorod ('branch') in a fiber crystal form, so that a heterojunction structure with a composite crystal form is constructed, and separation and transfer of photo-generated charges are facilitated. The DRP elementary substance photocatalyst shows excellent visible light water decomposition hydrogen production performance (1027 [mu] mol h <-1 > g <-1 >) and stability.

Description

technical field [0001] The invention is a three-dimensional dendritic red phosphorus single substance photocatalyst (DRP) with a composite crystal structure, which has excellent photocatalytic water splitting hydrogen production performance. In the present invention, commercial red phosphorus (RP) is first purified by hydrothermal method; the preparation process of chemical vapor deposition (CVD) is adopted, the purified amorphous RP is used as P source, and metal bismuth (Bi) is used as cocatalyst. A series of DRP monolithic photocatalysts were prepared by adjusting the mass ratio of RP and Bi. Among them, DRP (Bi:RP=1:2) exhibited the highest visible-light photocatalytic hydrogen production performance and stability. Background technique [0002] Hydrogen energy has the advantages of high energy density, safety and environmental protection, and recyclability, and is regarded as a green new energy that can replace traditional fossil fuels. Photocatalytic water splitting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/186C01B3/04
CPCB01J27/186B01J35/004B01J35/0013C01B3/042
Inventor 敬林吴春晓戴洪兴邓积光刘雨溪孙亚洁张启超
Owner BEIJING UNIV OF TECH
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