Cobalt and nickel dual-doped tin sulfide nanosheet and preparation method and application thereof

A dual doping and tin sulfide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of low selectivity and poor stability, and achieve improved electronic structure, High selectivity and good stability

Active Publication Date: 2019-04-19
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the catalytic activity and selectivity of the catalysts disclosed in the prior art are not high and the stability is not good

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  • Cobalt and nickel dual-doped tin sulfide nanosheet and preparation method and application thereof
  • Cobalt and nickel dual-doped tin sulfide nanosheet and preparation method and application thereof
  • Cobalt and nickel dual-doped tin sulfide nanosheet and preparation method and application thereof

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preparation example Construction

[0027] The invention provides a method for preparing cobalt-nickel double-doped tin sulfide nanosheets, comprising:

[0028] A) tin source, nickel source, cobalt source, sulfur source and ligand are mixed and reacted to obtain cobalt and nickel double-doped tin precursor;

[0029] B) Cobalt, nickel double-doped tin precursor, oleylamine and solvent are mixed, heated to react, cooled to obtain cobalt-nickel double-doped tin sulfide nanosheets.

[0030] The method for preparing cobalt-nickel double-doped tin sulfide nanosheets provided by the present invention firstly reacts tin source, nickel source, cobalt source, sulfur source and ligand to obtain cobalt-nickel double-doped tin precursor.

[0031] According to the present invention, the tin source includes but not limited to tin tetrachloride; the nickel source includes but not limited to nickel dichloride; the cobalt source includes but not limited to cobalt dichloride; the sulfur source includes but not limited to Limited ...

Embodiment 1

[0054] The invention provides a cobalt-nickel double-doped tin sulfide nanosheet, with an average size of 80 nm to 200 nm and an average thickness of 2 to 5 nm. Its synthesis method is as follows: dissolve 1mmol o-phenanthroline in 8 mL boiling water, add to vigorously stirred 4mL aqueous solution containing 1mmol tin tetrachloride, 0.02mmol nickel dichloride, 0.02mmol cobalt dichloride, and react for half Hour. 4 mL of an aqueous solution containing 4 mmol of sodium diethyldithiocarbamate was added dropwise. After reacting for 3 hours, filter, wash and dry to obtain a cobalt-nickel double-doped tin precursor. Then, 0.4 mmol of cobalt-nickel double-doped tin precursor and 10 mL of oleylamine were added to 20 mL of anisole, and reacted in a 45 mL hydrothermal kettle at 200°C for 24 hours. After cooling, wash with hexane and ethanol, centrifuge, and dry to obtain cobalt-nickel double-doped tin sulfide nanosheets.

[0055] Transmission electron microscope pictures of cobalt-ni...

Embodiment 2

[0057] Cobalt-nickel double-doped tin sulfide nanosheets as an active component of the electrocatalyst and electroreduction of carbon dioxide test conditions.

[0058] Disperse 0.2 mg of cobalt-nickel double-doped tin sulfide nanosheets, 0.8 mg of activated carbon, and 15 μL of 5% Nafion solution in 1 mL of ethanol, and sonicate for 1 h to obtain a uniform solution. Then, take the above solution and brush evenly on 1cm×0.5cm carbon paper. The carbon paper was used as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and the graphite rod was used as the counter electrode. Electrolyte for electroreduction carbon dioxide reaction is 40mL aqueous solution of potassium bicarbonate with a concentration of 0.1mol / L. Before the reaction, it is necessary to pass carbon dioxide for at least 30 minutes to drive away other gases. The catalytic reaction is performed in an H-type electrolytic cell separated by a Nafion 115 proton exchange memb...

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Abstract

The invention provides a preparation method of a cobalt and nickel dual-doped tin sulfide nanosheet. The method comprises the steps that 1, a tin source, a nickel source, a cobalt source, a sulfur source and a ligand are subjected to a mixed reaction, and a cobalt and nickel dual-doped tin precursor is obtained; 2, the cobalt and nickel dual-doped tin precursor, oleylamine and solvents are mixed,heated and cooled to obtain the cobalt and nickel dual-doped tin sulfide nanosheet. By introducing cobalt and nickel ions through the nickel source and the cobalt source, the electronic structure of the metal sulfide catalyst is improved, and therefore the catalytic activity and selectivity of the obtained cobalt and nickel dual-doped tin sulfide nanosheet for the carbon dioxide electrocatalytic reduction reaction are improved. The cobalt and nickel dual-doped tin sulfide nanosheet obtained through the preparation method is high in catalytic activity, good in stability and high in selectivity.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a cobalt-nickel double-doped tin sulfide nanosheet, its preparation method and application. Background technique [0002] In the chemical industry, carbon dioxide is an abundant and cheap carbon resource. It is very important to alleviate the energy crisis by converting carbon dioxide into fuels and high value-added chemicals through electrochemical processes. Since the CO2 molecule is very stable, the efficient activation of CO2 plays a key role in its electrochemical reduction process. [0003] In recent years, the regulation of the electronic structure of catalysts is an effective method to promote the activation of carbon dioxide by catalysts. For example, the introduction of oxygen vacancies in zinc oxide can change the electronic structure of zinc oxide, increase the electronic density of states at the top of its valence band, and greatly improve the ability of the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C25B11/06
CPCB01J31/28B01J35/0033C25B11/04
Inventor 杜旭涛张安曾杰
Owner UNIV OF SCI & TECH OF CHINA
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