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Preparation method of CoS nanoparticle/N-doped RGO composite material with hydrogen evolution effect

A nanoparticle and 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., and achieve the goal of promoting charge The effect of transmission, increased life, and low cost

Inactive Publication Date: 2017-11-07
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 composite material with hydrogen evolution effect
  • Preparation method of CoS nanoparticle/N-doped RGO composite material with hydrogen evolution effect
  • Preparation method of CoS nanoparticle/N-doped RGO composite material with hydrogen evolution effect

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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 take 20ml GO (2mg / ml) solution and slowly inject it into the above uniform mixed solution, stir vigorously, and sonicate 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 a...

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; 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 min; then it was transferred to a 100 ml hydrothermal kettle, and heated at 180 ° C for 14 h; after it was cooled to room temperature, it was taken out, Washed 5 times with deionized water and ethanol, freeze-dried. Transfer the freeze-dried black powder to a crucible under N 2 calcined at a temperature of 600 °C for 4 h, and the heating rate was 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 20 ml of GO (2 mg / ml) solution was slowly injected into the above homogeneous solution, vigorously stirred, and sonicated in a sonicator for 30 min; under vigorous stirring, the NH 3 ·H 2 O is injected dropwise into the homogeneous mixed solution (adjusting PH=10) to form a dark green solution; weigh 4 mmol (0.3005 g) 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 min; then it was transferred to a 100 ml hydrothermal kettle, and heated at 180 ° C for 14 h; after it was cooled to room temperature, it was taken out, Washed 5 times with deionized water and ethanol, freeze-dried. Transfer the freeze-dried black powder to a crucible under N 2 calcined at a temperature of 600 °C for 4 h...

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Abstract

The invention belongs to the technical field of material synthesis and discloses a preparation method of a CoS nanoparticle / N-doped RGO composite material with a hydrogen evolution effect. According to the method, a precursor is synthesized with a simple one-step solvothermal method, and then the CoS nanoparticle / N-doped RGO composite material is generated through high-temperature calcination and used for improving hydrogen evolution performance under an acidic condition. The preparation method has the advantages that the method is environment-friendly, the cost is low, the preparation process is simple, large-scale industrial production of a prepared catalyst is facilitated, and the prepared catalyst has excellent electrocatalytic activity and good hydrogen evolution stability. Heterocyclic atoms N are introduced into CoS / RGO, a synergistic effect of geometric imperfections and heteroatoms is realized, so that adsorption free energy of a carbon material for hydrogen ions can be reduced, hydrogen evolution is better facilitated, and the electrochemical performance of CoS can be improved substantially.

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 Applications(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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