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Carbon quantum dot loaded cobalt-ruthenium alloy composite material, preparation method and application thereof

A technology of carbon quantum dots and composite materials, applied in the field of ammonia borane hydrolysis, can solve the problem of high cost of metal nanoparticle agglomeration catalyst, and achieve the effects of improving activity and cycle stability, improving stability and being easy to implement.

Active Publication Date: 2020-11-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of metal nanoparticle agglomeration and high catalyst cost in the prior art, the purpose of the present invention is to provide a carbon quantum dot-supported cobalt-ruthenium alloy composite material and its preparation method and application. The present invention combines carbon quantum dots with cobalt-ruthenium The composite of alloy nanoparticles can provide a larger specific surface area, so that the metal nanoparticles can be more evenly dispersed on the surface of the material, and the supporting effect of the carbon film can effectively avoid the effect of particle growth and agglomeration after a long cycle; at the same time, the use of carbon quantum dots Synergistic effect with cobalt-ruthenium alloy to improve catalytic activity

Method used

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  • Carbon quantum dot loaded cobalt-ruthenium alloy composite material, preparation method and application thereof
  • Carbon quantum dot loaded cobalt-ruthenium alloy composite material, preparation method and application thereof
  • Carbon quantum dot loaded cobalt-ruthenium alloy composite material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of a carbon quantum dot-supported cobalt-ruthenium alloy composite material:

[0034] (a) Weigh 2 g of shredded tobacco, put it into a 150 mL hydrothermal reaction kettle, add 100 mL of deionized water, heat it at 180 °C for 4 h, cool to room temperature, and filter to obtain 4 g / L yellow Brown carbon dot solution;

[0035] (b) Weigh Co(NO 3 ) 2 ·6H 2 O 291 mg was added to the above solution, stirred for 30 min, and then RuCl was added according to the molar ratio Co:Ru=1:1 3 ·3H 2 O, stirred for 1.5 h, then transferred the obtained black solution to a 150 mL hydrothermal reactor, heated it in water at 200 °C for 8 h, cooled to room temperature, centrifuged the product at 10000 rpm for 10 min, and obtained The precipitate was vacuum dried at 60 °C to obtain the precursor powder;

[0036] (c) Finally, the above precursor powder was calcined at 600 °C for 6 h in a nitrogen atmosphere to obtain a carbon quantum dot-supported cobalt-ruthenium alloy composi...

Embodiment 2

[0038] Preparation of a carbon quantum dot-supported cobalt-ruthenium alloy composite material:

[0039] (a), with embodiment 1;

[0040] (b) Weigh Co(NO 3 ) 2 ·6H 2 O 291 mg was added to the above solution, stirred for 30 min, and then RuCl was added according to the molar ratio Co:Ru=1:0.5 3 ·3H 2 O, stirred for 1.5 h, then transferred the obtained black solution to a 150 mL hydrothermal reactor, heated it in water at 200 °C for 8 h, cooled to room temperature, centrifuged the product at 10000 rpm for 10 min, and obtained The precipitate was vacuum dried at 60 °C to obtain the precursor powder;

[0041] (c), as in Example 1, the obtained carbon quantum dot-supported cobalt-ruthenium alloy composite material is marked as CoRu0.5 / CQDs composite material.

Embodiment 3

[0043] Preparation of a carbon quantum dot-supported cobalt-ruthenium alloy composite material:

[0044] (a), with embodiment 1;

[0045] (b) Weigh Co(NO 3 ) 2 ·6H 2 O 145.5 mg was added to the above solution, stirred for 30 min, and then RuCl was added according to the molar ratio Co:Ru=1:0.3 3 ·3H 2 O, stirred for 1.5 h, then transferred the obtained black solution to a 150 mL hydrothermal reactor, heated it in water at 200 °C for 8 h, cooled to room temperature, centrifuged the product at 10000 rpm for 10 min, and obtained The precipitate was vacuum dried at 60 °C to obtain the precursor powder;

[0046] (c), as in Example 1, the obtained carbon quantum dot-supported cobalt-ruthenium alloy composite material is marked as CoRu0.3 / CQDs composite material.

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Abstract

The invention belongs to the technical field of ammonia borane hydrolysis, and discloses a carbon quantum dot loaded cobalt-ruthenium alloy composite material, a preparation method and application thereof. The method comprises: preparing a carbon quantum dot solution with the concentration of 26 g / L; fully dissolving a water-soluble salt of Co and a water-soluble salt of Ru in a carbon quantum dotsolution according to a molar ratio of Co to Ru of 1:(1-0.1), carrying out hydrothermal treatment at 160-200 DEG C for 4-10 hours, centrifuging, and drying to obtain precursor powder; and placing theprecursor powder in an inert atmosphere, and roasting for 4-8 hours at a temperature of 400-800 DEG C to obtain the carbon quantum dot loaded cobalt-ruthenium alloy composite material. The inventiondiscloses application of a carbon quantum dot loaded cobalt-ruthenium alloy composite material as an ammonia borane hydrogen production catalyst. According to the invention, by compounding carbon quantum dots and cobalt-ruthenium alloy nanoparticles, a large specific surface area can be provided, so that the metal nanoparticles are more uniformly dispersed on the surface of the material, and the supporting effect of the carbon film can effectively prevent the particles from growing up and agglomerating after long circulation; and the catalytic activity is improved by utilizing the mutual synergistic effect of the carbon quantum dots and the cobalt-ruthenium alloy.

Description

technical field [0001] The invention belongs to the technical field of ammonia borane hydrolysis, and in particular relates to a carbon quantum dot-loaded cobalt-ruthenium alloy composite material and a preparation method and application thereof. Background technique [0002] In recent years, with the increasing environmental pollution and energy crisis, more and more researchers are eager to find an environmentally friendly new energy system to replace traditional fossil fuels. Hydrogen energy is an ideal clean, non-toxic, and abundant energy carrier, which has incomparable potential development value due to its fast reaction rate and high hydrogen release capacity. Among various chemical hydrogen storage materials, ammonia borane (NH 3 BH 3 ) has attracted the attention of many researchers. Its mass hydrogen storage density is as high as 19.6%, and it has the characteristics of suitable hydrogen release temperature, safe and non-toxic hydrogen release process, thermal st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02C01B3/06
CPCB01J23/8913C01B3/065B01J35/40Y02E60/36
Inventor 卢思宇李卫东刘源王柏扬刘仲毅宋昊强
Owner ZHENGZHOU UNIV
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