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Cadmium sulfide with adjustable hexagonal phase and cubic phase content, and preparation method and applications thereof

A cadmium sulfide, cubic phase technology, applied in cadmium sulfide, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as poor performance, achieve simple and easy process, and facilitate large-scale promotion , the effect of low energy consumption

Inactive Publication Date: 2017-10-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure CdS performs poorly in photocatalytic hydrogen production, mainly due to the rapid recombination of photogenerated electron-hole pairs produced by CdS during the photocatalytic process.

Method used

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  • Cadmium sulfide with adjustable hexagonal phase and cubic phase content, and preparation method and applications thereof
  • Cadmium sulfide with adjustable hexagonal phase and cubic phase content, and preparation method and applications thereof
  • Cadmium sulfide with adjustable hexagonal phase and cubic phase content, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing cadmium sulfide capable of regulating the content of hexagonal phase and cubic phase, the specific steps are as follows:

[0025] (1) Dissolve 0.2566g of sublimed sulfur in 25ml of diethylenetriamine, and stir at room temperature for 1h;

[0026] (2) Dissolve 0.2284g (half) cadmium chloride pentahydrate (so that the ratio of the amount of Cd to S is 1:8) in 25ml deionized water, and stir at room temperature for 20min;

[0027] (3) Mix the solution in step (1) and the solution in step (2), and stir at room temperature for 1 h;

[0028] (4) Transfer the mixed solution in step (3) to a polytetrafluoroethylene-lined stainless steel reaction kettle, and heat at 80° C. for 48 hours in a drying oven;

[0029] (5) The heated product was naturally cooled to room temperature, then centrifuged and washed with deionized water and absolute ethanol, and dried at 60° C. for 12 hours.

[0030] The hexagonal phase content in the cadmium sulfide prepared in this ...

Embodiment 2

[0032] The preparation method of this example is the same as that of Example 1, except that the mass of (semi) cadmium chloride pentahydrate in step (2) is changed to 0.4568g, so that the ratio of the amount of Cd to S is 1:4.

[0033] The hexagonal phase content in the cadmium sulfide prepared in this example is 68%, and the cubic phase content is 32%. The photocatalytic hydrogen production rate of cadmium sulfide under visible light (λ≥400nm) is 8543 μmol g -1 h -1 .

Embodiment 3

[0035] The preparation method of this example is the same as that of Example 1, except that the mass of (semi) cadmium chloride pentahydrate in step (2) is changed to 1.8273g, so that the ratio of the amount of Cd to S is 1:1.

[0036] The morphology of the cadmium sulfide prepared in this embodiment is as follows: figure 2 As shown, CdS exhibits a sheet-like structure. The hexagonal phase content in CdS is 60.3%, and the cubic phase content is 39.7%. The photocatalytic hydrogen production rate of cadmium sulfide under visible light (λ≥400nm) is 17501 μmol g -1 h -1 .

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Abstract

The invention relates to cadmium sulfide with adjustable hexagonal phase and cubic phase content, and a preparation method and applications thereof. The microtopography of the cadmium sulfide is of a sheet structure; the length of the cadmium sulfide nanometer sheets ranges from 25 to 50nm, and the width ranges from 8 to 15nm. According to the preparation method, cadmium chloride hemipentahydrate and sublimed sulfur are taken as raw materials, deionized water and diethylenetriamine are taken as solvents, solvothermal method is adopted to prepare cadmium sulfide, and the hexagonal phase and cubic phase content of cadmium sulfide is adjusted and controlled via adjusting and controlling the molar ratio of cadmium chloride hemipentahydrate to sublimed sulfur, so that optimization of the capability of the prepared cadmium sulfide in hydrogen production via photocatalytic decomposition of water with visible light is realized.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and hydrogen production by photolysis of water, and more specifically relates to a cadmium sulfide whose content of hexagonal phase and cubic phase can be adjusted and its preparation method and its application in the field of hydrogen production by photolysis of water. Background technique [0002] As a new energy source, hydrogen has high energy density, can be stored and transported, and its combustion product is only water, which will not pollute the environment. Since the discovery of TiO by Fujishima and Honda in 1972 2 Single crystal electrodes can decompose water under light to produce hydrogen and oxygen, and successfully convert light energy into electrical energy and chemical energy. Since the photocatalytic hydrogen production has been favored by many research institutions, various new photocatalysts have emerged in an endless stream. [0003] CdS is a typical II-IV semiconducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G11/02B82Y30/00B82Y40/00B01J27/04
CPCB01J27/04B82Y30/00B82Y40/00C01G11/02C01P2002/30C01P2002/72C01P2004/04C01P2004/64
Inventor 吕珺董浩徐光青郑治祥吴玉程
Owner HEFEI UNIV OF TECH
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