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Black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as preparation method and application thereof

A tungsten nitride nano-catalyst technology, applied in the field of photocatalytic materials, can solve the problems of poor light response, poor hydrogen evolution performance of photolysis water, easy reorganization of photogenerated carriers, etc., and achieves the effect of promoting transfer and facilitating charge transfer.

Inactive Publication Date: 2020-06-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a black phosphorous-loaded solution to solve the technical problems of poor photocatalyst’s photoresponse in the near-infrared region, inability to absorb near-infrared light, and photogenerated carriers’ easy recombination. Tungsten nitride nanosheet photocatalyst and its preparation method and application

Method used

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  • Black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as preparation method and application thereof
  • Black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as preparation method and application thereof
  • Black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] A black phosphorus-supported tungsten nitride nanosheet photocatalyst mainly contains three main elements of P, W and N, and is prepared by a method comprising the following steps:

[0106] (1), preparation of black phosphorus (hereinafter referred to as BP) crystal

[0107] First, red phosphorus was added to deionized water, and the resulting solution was transferred into a Teflon-lined stainless steel autoclave and hydrothermally heated at 180 °C for 20 h under hydrothermal reaction conditions to remove the oxide layer. Then, 500 mg of red phosphorus (RP) after hydrothermal treatment, 20 mg of tin powder (Sn) and tin tetraiodide (SnI 4 ) 10mg sealed in a vacuumized quartz glass tube. We heated the quartz glass tube at a rate of 0.1-3 °C per minute to 650 °C for 5 hours and then cooled it to 500 °C at a rate of 1.35 °C / min, followed by natural cooling. The resulting product needs to be washed several times with hot toluene and acetone to remove excess mineralizer, dr...

Embodiment 2

[0119] The hydrogen evolution performance of the obtained black phosphorus-supported tungsten nitride nanosheet photocatalyst sample was tested.

[0120] Weigh 10mg of the Bulk-BP, BP-BM, WN obtained in the above steps (1)(2)(3) and the BP-BM / WN finally obtained in the step (4) respectively in the sample bottle, and add 10mL respectively to remove Ionized water, and then control the power to 60W, the frequency is 40KHz to carry out ultrasonication for 10 minutes, then use argon to exhaust, and after exhausting for 2 hours, put it under the irradiation of 300W xenon lamp (with 420nm cut-off filter or 700nm cut-off filter) Hydrogen production test.

[0121] The above black phosphorus-supported tungsten nitride nanosheet photocatalyst is used for photocatalytic water splitting to produce hydrogen, and its dosage as a catalyst is 10 mg. Depend on Figure 5 In a, under >420nm light, the hydrogen production rate of catalytic water splitting for 5 hours is 9.42 μmol, and the hydrog...

Embodiment 3

[0125] The photoelectric properties of the obtained black phosphorus-supported tungsten nitride nanosheet photocatalyst samples were tested.

[0126] Mix 7.5mg of photocatalyst, 1mg of ethyl cellulose, 1mL of α-terpineol, and 0.5mL of ethanol, and then control the power to 60W and frequency of 40KHz to perform ultrasonication for 12h to obtain a slurry; the slurry obtained above is coated on On the FTO glass, the coating thickness is controlled to be 0.5-1mm, and dried in an oven at 60°C to obtain a working electrode for electrochemical testing, which is then tested at an electrochemical workstation for photoelectrochemical performance.

[0127] BP-BM / WN represents the resulting black phosphorus-supported tungsten nitride nanosheet photocatalyst, from Figure 6 In a and 6b, it can be seen that when the lamp is turned off, no current is generated, and when the lamp is turned on, a photocurrent is generated, which indicates that the photogenerated electron-hole pairs of BP-BM / WN...

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Abstract

The invention relates to a black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as a preparation method and application thereof. Black phosphorus crystals are prepared, and band gaps of the black phosphorus crystals are changed by a high-energy ball milling method, so that black phosphorus nanosheets are obtained; preparing tungsten nitride nanosheets, and growing the tungstennitride nanosheets on the surfaces of the black phosphorus nanosheets through a high-energy ball milling method. Compared with the prior art, the photocatalyst disclosed by the invention has a wide light absorption range; the performance of decomposing water to produce hydrogen is higher; a response also exists in a near-infrared area; cAPABILITY FOR QUICK TRANSFER OF CARRIERS, the photon-generated carrier separation capability is high; the photocatalyst has the characteristics of low carrier recombination rate, certain hydrogen evolution cycle stability and the like, is used for photocatalytic water decomposition hydrogen production, has the highest hydrogen production rate of 188.42 mu mol.g <-1 >. H <-1 > under visible light, and has the hydrogen production rate of 10.77 mu mol.g <-1 >.H <-1 > under the irradiation of light with the wavelength of greater than 700nm; the preparation method is simple to operate and low in cost, and the used raw materials are non-toxic and environment-friendly.

Description

technical field [0001] The invention relates to photocatalytic materials, in particular to a black phosphorus-loaded tungsten nitride nanosheet photocatalyst, a preparation method and application thereof. Background technique [0002] It is well known that hydrogen (H 2 ) is a green, renewable energy source that can be generated from water using solar energy. Furthermore, solar energy is the most abundant source of all clean and sustainable energy sources. In order to alleviate the increasingly severe energy crisis, hydrogen is gradually becoming more and more important. Therefore, photocatalytic water splitting for hydrogen production without the use of hole quenchers has attracted extensive attention in the past decades. But making full use of solar resources is a daunting task. As we all know, near-infrared (NIR) light accounts for 50% of sunlight and is worth developing and utilizing. However, the photon energy in the near-infrared region beyond 700nm is very small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/14B01J35/00B01J35/02B01J37/00C01B3/04
CPCB01J27/24B01J27/14B01J37/0036C01B3/042C01B2203/1088B01J35/33B01J35/00B01J35/30B01J35/39Y02E60/36
Inventor 闵宇霖徐书张荣军时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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