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Preparation method of cos nanoparticle/n-doped rgo hydrogen evolution composite material

A nanoparticle, composite material technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of slow electron transfer rate, limited hydrogen evolution performance, poor stability, etc. The effect of transmission, improved life and low cost

Inactive Publication Date: 2019-12-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CoS has disadvantages such as slow electron transfer rate, easy agglomeration, and poor stability, which limit its hydrogen evolution performance.

Method used

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  • Preparation method of cos nanoparticle/n-doped rgo hydrogen evolution composite material
  • Preparation method of cos nanoparticle/n-doped rgo hydrogen evolution composite material
  • Preparation method of cos nanoparticle/n-doped rgo hydrogen evolution composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of CoS nanoparticles / N-doped RGO hydrogen evolution composites:

[0031] Weigh 0.75mmol (0.2183g) of Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water and stirred until a homogeneous solution was formed;

[0032] Weigh 0.96mmol (0.08072g) of DCDA and dissolve it in deionized water to form a homogeneous solution;

[0033] Slowly inject the DCDA solution into the Co(NO 3 ) 2 ·6H 2 O solution; then slowly inject 20ml of GO (2mg / ml) solution into the above uniform mixed solution, stir vigorously, and ultrasonically in an ultrasonic instrument for 30min; under vigorous stirring, NH 3 ·H 2 O was injected dropwise into the homogeneous mixed solution (PH=10) to form a dark green solution;

[0034] Weigh 4mmol (0.3005g) of C 2 h 5 NS was dissolved in deionized water, and the solution was slowly injected into the dark green solution under vigorous stirring, and stirred for 30 minutes; then it was transferred to a 100ml hydrothermal kettle, and heated at 1...

Embodiment 2

[0036] Preparation of monomeric CoS nanoparticles:

[0037] Weigh 0.75mmol (0.2183g) of Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water and stirred to form a homogeneous mixed solution; under vigorous stirring, the NH 3 ·H 2 O was injected dropwise into the homogeneous mixed solution (PH=10) to form a dark green solution; weighed 4mmol (0.3005g) of C 2 h 5 NS was dissolved in deionized water, and the solution was slowly injected into the dark green solution under vigorous stirring, and stirred for 30 minutes; then it was transferred to a 100ml hydrothermal kettle, and heated at 180°C for 14 hours; it was cooled to room temperature and taken out, Washed 5 times with deionized water and ethanol, and freeze-dried. Transfer the freeze-dried black powder to a crucible under N 2 Calcination in the medium range, calcination at 600°C for 4h, heating rate 4°C / min. Then take out and grind to obtain monomeric CoS nanoparticles.

Embodiment 3

[0039] Preparation of CoS / RGO nanoparticles:

[0040] Weigh 0.75mmol (0.2183g) of Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water and stirred to form a homogeneous solution; then 20ml GO (2mg / ml) solution was slowly injected into the above homogeneous solution, stirred vigorously, and sonicated in an ultrasonic instrument for 30min; under vigorous stirring, the NH 3 ·H 2 O was dripped into the uniform mixed solution (adjusted to PH=10) to form a dark green solution; weighed 4mmol (0.3005g) of C 2 h 5 NS was dissolved in deionized water, and the solution was slowly injected into the dark green solution under vigorous stirring, and stirred for 30 minutes; then it was transferred to a 100ml hydrothermal kettle, and heated at 180°C for 14 hours; it was cooled to room temperature and taken out, Washed 5 times with deionized water and ethanol, and freeze-dried. Transfer the freeze-dried black powder to a crucible under N 2 Calcination in the medium range, calcination at ...

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Abstract

The invention belongs to the technical field of material synthesis and discloses a method for preparing a CoS nanoparticle / N-doped RGO composite material with hydrogen evolution effect. The present invention synthesizes the precursor through a simple one-step solvothermal method, and then calculates it at high temperature to generate CoS nanoparticles / N-doped RGO composite materials, which are used to improve hydrogen evolution performance under acidic conditions. The invention has the advantages of being green and environmentally friendly, with low cost and simple preparation process. The prepared catalyst is easy for large-scale industrial production and has excellent electrocatalytic activity and good hydrogen evolution stability. The introduction of heterocyclic atom N into CoS / RGO forms a synergistic effect of geometric defects and heteroatoms, which can reduce the adsorption free energy of hydrogen ions in carbon materials, is more conducive to the precipitation of hydrogen, and can significantly improve the electrochemical performance of CoS.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a preparation method of a CoS nanoparticle / N-doped RGO composite material and its application as a catalyst for electrochemical hydrogen evolution. Background technique [0002] Recently, human beings are facing increasingly serious environmental pollution and energy crisis, and the development and utilization of clean and efficient energy is one of the important challenges to solve the current crisis. From the perspective of energy cleanliness and recyclability, hydrogen energy, as an efficient, clean, and environmentally friendly secondary energy, has the characteristics of rich resources, high calorific value, environmental protection and pollution-free, and various utilization forms. The ideal new energy has unparalleled advantages and infinitely broad application prospects. However, how to obtain relatively cheap hydrogen energy through an effective w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/04
CPCC25B1/04B01J27/24B01J35/33Y02E60/36
Inventor 谢吉民赵文通陈琳琳朱成章陆俊伟钱坤杨赛赛
Owner JIANGSU UNIV
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