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Hollow tubular cobalt-selenium compound/molybdenum-selenium compound composite nano-material and preparation method and application thereof

A technology of composite nanomaterials and selenium compounds, which is applied in the field of inorganic micro-nano material preparation, can solve the problems of poor conductivity, insufficient lamellar catalytic active sites, limited catalytic performance, etc., and achieves controllable reaction, excellent electrochemical performance, process Mature and stable effect

Active Publication Date: 2018-12-28
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But MoSe 2 Nanomaterials, due to their two-dimensional sheet structure, are prone to agglomeration, resulting in insufficient catalytic active sites on the exposed sheets, and their poor electrical conductivity limits their catalytic performance.

Method used

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  • Hollow tubular cobalt-selenium compound/molybdenum-selenium compound composite nano-material and preparation method and application thereof
  • Hollow tubular cobalt-selenium compound/molybdenum-selenium compound composite nano-material and preparation method and application thereof
  • Hollow tubular cobalt-selenium compound/molybdenum-selenium compound composite nano-material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A hollow tubular CoSe 2 / MoSe 2 A method for preparing a composite nanomaterial, comprising the steps of:

[0038] A. Weigh 1.5mmol cobalt chloride hexahydrate and 3mmol urea, add 30ml deionized water and stir until dissolved to obtain a clear and transparent solution; transfer the solution to a reaction kettle lined with tetrafluoroethylene, close the reaction kettle and put In a constant temperature box, heat at 90°C for 12h;

[0039] B. After the reaction, the cooled liquid in the reaction kettle was centrifuged to separate the solid product, and after the solid product was cleaned several times, it was placed in a vacuum drying oven and dried at 60°C for 6 hours;

[0040] C, weigh 0.12g of the product obtained in step B, add 30mL N, N-dimethylformamide, stir to make it uniformly dispersed; then add 0.45mmol sodium molybdate (Na 2 MoO 4 ), stirred until completely dissolved;

[0041] D. Add 2mmol of selenium powder into 2mL of hydrazine hydrate, stir until disso...

Embodiment 2

[0047] A hollow tubular CoSe 2 / MoSe 2 A method for preparing a composite nanomaterial, comprising the steps of:

[0048] A. Weigh 2mmol cobalt chloride hexahydrate and 2mmol urea, add 30ml deionized water and stir until dissolved to obtain a clear and transparent solution; transfer the solution to a reaction kettle lined with tetrafluoroethylene, close the reaction kettle and put it into a constant temperature In the oven, heat at 120°C for 10h;

[0049] B. After the reaction, the cooled liquid in the reaction kettle was centrifuged to separate the solid product, and after the solid product was cleaned several times, it was placed in a vacuum drying oven and dried at 60°C for 6 hours;

[0050] C, weigh 0.3g of the product obtained in step B, add 50mL N, N-dimethylformamide, stir to make it uniformly dispersed; then add 0.8mmol sodium molybdate (Na 2 MoO 4 ), stirred until completely dissolved;

[0051] D. Add 3mmol of selenium powder into 3mL of hydrazine hydrate, stir u...

Embodiment 3

[0055] A hollow tubular CoSe 2 / MoSe 2 A method for preparing a composite nanomaterial, comprising the steps of:

[0056] A. Weigh 1mmol cobalt nitrate hexahydrate and 2mmol urea, add 20ml deionized water and stir until dissolved to obtain a clear and transparent solution; transfer the solution to a reaction kettle lined with tetrafluoroethylene, close the reaction kettle and put it into a constant temperature box , at 140°C, heating for 8h;

[0057] B. After the reaction, the cooled liquid in the reaction kettle was centrifuged to separate the solid product, and after the solid product was cleaned several times, it was placed in a vacuum drying oven and dried at 60°C for 6 hours;

[0058] C, weigh 0.2g of the product obtained in step B, add 40mL N, N-dimethylformamide, stir to make it uniformly dispersed; then add 0.7mmol sodium molybdate (Na 2 MoO 4 ), stirred until completely dissolved;

[0059] D. Add 2mmol of selenium powder into 3mL of hydrazine hydrate, stir until ...

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Abstract

The invention discloses a hollow tubular cobalt-selenium compound / molybdenum-selenium compound composite nano-material, a preparation method and an application thereof. Firstly, a solid one-dimensional Co precursor nanomaterial is obtained through reaction of cobalt salt with urea in a liquid phase environment; then, the solid one-dimensional Co precursor nanomaterial is dispersed in a molybdate deionized water solution, and the hollow tubular CoSe2@MoSe2 composite nanomaterial is obtained by further liquid-phase selenization reaction. The adopted raw materials and process devices are simple,the preparation cost is low, the product yield is high, the prepared composite material can serve as a catalyst applied to catalytic hydrogen evolution of electrolysis water because of the advantagesof its composition and structure, shows the excellent performance of catalytic hydrogen evolution, and has the huge potential application value in the field of hydrogen production through electric water decomposition.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic micro-nano materials, and in particular relates to a hollow tubular cobalt-selenium compound / molybdenum-selenide compound nanomaterial and its preparation method and application. Background technique [0002] Hydrogen is an efficient and clean energy, and its calorific value is much higher than that of traditional fossil energy. There are many ways to produce hydrogen, among which hydrogen production based on electrolysis of water hydrogen evolution reaction (HER) is considered the most effective method. Although water electrolysis is an effective way to obtain high-purity hydrogen, the actual operating voltage in the commercial water electrolysis process is much higher than the theoretical voltage required for water splitting. High energy consumption has become the biggest problem restricting hydrogen production from electrolyzed water. Excessive overpotential is the cause of h...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/06C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/0573B01J35/58B01J35/33B01J35/23Y02E60/36
Inventor 王伟智施华峰汪欣欣
Owner ANHUI NORMAL UNIV
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