Few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and preparation method thereof

A catalyst and composite light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as low photocatalytic efficiency, achieve large specific surface area, simple process, and many active sites. Effect

Active Publication Date: 2019-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of single-substance photocatalysts in the prior art, such as pure ReS 2 Nanosheet or MoS 2 Nanosheets, there is a technical problem of low photocatalytic efficiency due to the rapid recombination of photoinduced electron-hole pairs

Method used

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  • Few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and preparation method thereof
  • Few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and preparation method thereof
  • Few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 (MoS 2 with ReS 2 The molar ratio is about 10.3)

[0028] (1) ReS 2 Single crystal bulk as raw material, prepared ReS by ball milling 2 powder, the ball milling time is 16h, and the ball milling speed is 400rpm. Get ReS 2 powder dispersed in ethanol, where ReS 2 The mass of the powder is about 30mg, and the volume of ethanol is about 50ml; after that, it is sonicated in an ultrasonic machine, and the ultrasonication time is about 4h. After the above ultrasonic dispersion was left to stand for several hours, centrifuge at 4000rpm at low speed for 20min to obtain the supernatant, and then centrifuge at 12000rpm at high speed for 20min to collect the precipitate attached on the centrifuge tube, pass the precipitate through ethanol and deionized Wash with water for 3-5 times, then transfer to a Petri dish, and finally freeze-dry the nanosheets for several hours to obtain evenly dispersed few-layer ReS 2 Nanosheets.

[0029] (2) Add 0.3g sodium molybdate di...

Embodiment 2

[0031] Embodiment 2: (MoS 2 with ReS 2 The molar ratio is about 13.8)

[0032] The difference from Example 1 is that in step (2) sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) is 0.4g, dibenzyl disulfide (C 14 h 14 S 2 ) is 0.4g.

Embodiment 3

[0033] Embodiment 3: (MoS 2 with ReS 2 The molar ratio is about 6.2)

[0034] The difference from Example 1 is that ReS in step (1) 2 The powder mass is about 50mg.

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Abstract

The invention discloses a few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and a preparation method thereof. The preparation method mainly comprises following steps: 1, ball milling is carried out to prepare ReS2; 2, ReS2 powder is dispersed in a solvent such as ethanl for ultrasonic peeling; 3, an obtained ultrasonic dispersed solution is subjected to centrifugalization, a product is collected, washed, and freeze-dried so as to obtain few-layer ReS2 nanosheet; 4, sodium molybdate dihydrate and dibenzyl disulfide are ultrasonically dispersed in deionized water and ethanol respectively, obtained two suspensions are introduced into an autoclave for hydrothermal treatment, and at last, an obtained corresponding product is subjected to centrifugalization to obtain MoS2QDs supernatant layer; and 5, the prepared MoS2QDs and the ReS2 nanosheet are subjected to second hydrothermal compounding so as to obtain the few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst. The few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst prepared through the preparation method is excellent in performance, simple in operation and high in application value.

Description

technical field [0001] The invention relates to the field of hydrogen production by photocatalytic decomposition of water, in particular to a few-layer ReS 2 Nanosheet-MoS 2 Preparation method of quantum dot composite photocatalyst. Background technique [0002] The energy issue is a crisis and a major challenge that the world is currently facing. At present, the oil industry is facing huge uncertainties. At the same time, the main energy sources in the world are non-renewable primary energy sources. This kind of long-term resource consumption is bound to be unsustainable. In terms of new energy, such as hydrogen energy, it has high calorific value and energy utilization rate, and it is also a recyclable clean energy with great application potential. Direct conversion of solar energy into storable and transportable chemical fuels remains a challenging problem in the field of sustainable energy research. In particular, photo(electro)catalytic water splitting has emerged a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/02B01J37/00B01J37/10B01J37/34
CPCB01J27/051B01J35/004B01J35/023B01J37/0036B01J37/10B01J37/343
Inventor 吕斌周子文曾升叶志镇
Owner ZHEJIANG UNIV
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