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Preparation method of tungsten disulfide nanosheet modified cadmium sulfide photocatalyst

A technology of photocatalyst and tungsten disulfide, applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve problems such as low solar conversion efficiency and photocorrosion, and achieve improved photostability, good light Stability, effect of inhibiting photocorrosion

Pending Publication Date: 2022-07-22
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the technical problems of severe photocorrosion and low solar energy conversion efficiency of existing CdS-based photocatalysts, and provides a preparation method for cadmium sulfide photocatalyst modified by tungsten disulfide nanosheets

Method used

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  • Preparation method of tungsten disulfide nanosheet modified cadmium sulfide photocatalyst
  • Preparation method of tungsten disulfide nanosheet modified cadmium sulfide photocatalyst
  • Preparation method of tungsten disulfide nanosheet modified cadmium sulfide photocatalyst

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specific Embodiment approach 1

[0041] Embodiment 1: The preparation method of a tungsten disulfide nanosheet modified cadmium sulfide photocatalyst in this embodiment is carried out according to the following steps:

[0042] Step 1. Add cadmium nitrate tetrahydrate and thiourea into ethylenediamine, stir magnetically, and then put it into a polytetrafluoroethylene reactor for solvothermal reaction, then naturally cool to room temperature, wash with deionized water, and dry , to obtain CdS nanorods;

[0043] Step 2, fully grinding dicyandiamide, ammonium metatungstate and the CdS nanorods obtained in step 1 to obtain a uniformly mixed pale yellow powder;

[0044] Step 3. The light yellow powder obtained in step 2 is heated from room temperature to 400-500 ℃ in a nitrogen atmosphere, kept warm, then heated to 800-900 ℃, kept warm, and then naturally cooled to room temperature to obtain 1T-WS 2 / 2H-WS 2 / CdS nanoheterojunction photocatalyst, namely tungsten disulfide nanosheet modified cadmium sulfide photoc...

specific Embodiment approach 2

[0045] Embodiment 2: The difference between this embodiment and Embodiment 1 is: in step 1, the addition amount of cadmium nitrate tetrahydrate is 0.5-1.5g, the addition amount of thiourea is 0.5-2g, and the addition amount of ethylenediamine is 25mL. Others are the same as the first embodiment.

specific Embodiment approach 3

[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that: in step 1, the magnetic stirring time is 30-40 min, and the rotational speed is 600-1000 rpm. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a tungsten disulfide nanosheet modified cadmium sulfide photocatalyst, and relates to the field of a transition metal sulfide nano heterojunction preparation method and hydrogen production by photocatalytic water splitting. The technical problems that an existing CdS-based photocatalyst is serious in photo-corrosion problem and low in solar energy conversion efficiency are solved. The preparation method comprises the following steps: firstly, preparing a cadmium sulfide nanorod with good visible light absorption capacity by adopting a hydrothermal method, then pyrolyzing dicyandiamide at high temperature and high pressure by adopting a calcining method, providing an alkaline atmosphere, and preparing the dark green photocatalyst by taking the CdS nanorod as a sulfur source and ammonium metatungstate as a tungsten source. In the preparation process, alkaline gas released by thermal decomposition of dicyandiamide can play a role in stripping tungsten disulfide nanosheets and promote generation of 1T-phase tungsten disulfide. The tungsten disulfide nanosheet modified cadmium sulfide photocatalyst prepared by the invention is applied to the field of photocatalytic hydrogen production.

Description

technical field [0001] The invention relates to a preparation method of transition metal sulfide nano-heterojunction and the field of photocatalytic water splitting to produce hydrogen. Background technique [0002] With the increasingly severe global energy crisis and environmental problems, in order to achieve the national development goal of "carbon peaking and carbon neutrality", scientific development of renewable and clean energy has far-reaching practical significance. On the one hand, solar energy has the characteristics of being inexhaustible and inexhaustible. On the other hand, hydrogen energy has the characteristics of high combustion calorific value and non-polluting products, so it is the most ideal clean fuel. Therefore, using photocatalytic water splitting to produce hydrogen to efficiently convert solar energy into hydrogen energy is the best way to solve energy and environmental problems. Cadmium sulfide (CdS) is a narrow bandgap (about 2.4 eV) semiconduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/047C01B3/04
CPCB01J27/047C01B3/042B01J35/23B01J35/39Y02E60/36
Inventor 徐平陈晓宇韩喜江张彬杜耘辰
Owner HARBIN INST OF TECH
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