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Sulfur-nitrogen co-doped graphene modified graphite felt composite electrode and preparation method thereof

A composite electrode and graphene technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of complex preparation methods, low catalytic performance, low doping content, etc., and achieve good doping effect, large surface area, sulfur Effect of Nitrogen Doping Uniformity

Active Publication Date: 2020-08-07
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods have disadvantages such as high cost, low doping content, low catalytic performance, and complicated preparation methods. Therefore, it is urgent to develop graphite felt composite electrodes that can be prepared by simple methods and have excellent performance.

Method used

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  • Sulfur-nitrogen co-doped graphene modified graphite felt composite electrode and preparation method thereof
  • Sulfur-nitrogen co-doped graphene modified graphite felt composite electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A sulfur and nitrogen co-doped graphene-modified graphite felt composite electrode and a preparation method thereof, the steps of the preparation method are as follows:

[0042] s1. Add graphene oxide into deionized water to prepare a 2 mg / ml solution, ultrasonically oscillate and disperse, and then perform magnetic stirring. During the stirring process, add thiourea and L-ascorbic acid respectively to obtain a mixed solution, wherein the mass ratio of thiourea to graphene oxide is 10:1, the mass ratio of L-ascorbic acid and graphene oxide is 5:1, then drip ammonia water to adjust the pH of the mixed solution to pH=8, and continue to stir to obtain a uniform and stable suspension;

[0043] s2. Transfer the suspension to the reaction kettle, seal it and put it in a constant temperature drying oven, heat it at 180°C for 12 hours, take it out after natural cooling, vacuum filter the suspension in the reaction kettle, and then use ethanol and remove Washing with ionic water...

Embodiment 2

[0047] A sulfur and nitrogen co-doped graphene-modified graphite felt composite electrode and a preparation method thereof, the steps of the preparation method are as follows:

[0048] s1. Add graphene oxide into deionized water to form a 2mg / ml solution, ultrasonically oscillate and disperse, and then perform magnetic stirring. During the stirring process, add thiourea and L-ascorbic acid respectively to obtain a mixed solution, in which the mass of thiourea and graphene oxide The ratio is 10:1, the mass ratio of L-ascorbic acid to graphene oxide is 5:1, then drip ammonia water to adjust the pH of the mixed solution to pH=8, and continue to stir to obtain a uniform and stable suspension;

[0049] s2. Transfer the suspension to the reaction kettle, seal it and put it in a constant temperature drying oven, heat it at 180°C for 12 hours, take it out after natural cooling, vacuum filter the suspension in the reaction kettle, and then use ethanol and remove Washing with ionic wate...

Embodiment 3

[0053] A sulfur and nitrogen co-doped graphene-modified graphite felt composite electrode and a preparation method thereof, the steps of the preparation method are as follows:

[0054] s1. Add graphene oxide into deionized water to form a solution of 1 mg / ml. After ultrasonic oscillation and dispersion, perform magnetic stirring. During the stirring process, add thiourea and L-ascorbic acid to obtain a mixed solution, in which the mass of thiourea and graphene oxide The ratio is 8:1, the mass ratio of L-ascorbic acid to graphene oxide is 7:1, then drip ammonia water to adjust the pH of the mixed solution to pH=7.8, and continue to stir to obtain a uniform and stable suspension;

[0055] s2. Transfer the suspension to the reaction kettle, seal it and put it in a constant temperature drying oven, heat it at 170°C for 14 hours, take it out after natural cooling, vacuum filter the suspension in the reaction kettle, and then use ethanol and remove Washing with ionic water and freez...

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Abstract

The invention discloses a sulfur-nitrogen co-doped graphene modified graphite felt composite electrode and a preparation method thereof. The preparation method comprises the following steps: s1, adding graphene oxide into deionized water to prepare a 1mg / ml-5mg / ml solution, carrying out ultrasonic oscillation dispersion, carrying out magnetic stirring, adding thiourea and a reducing agent to obtain a mixed solution, adjusting the pH value to 7.8-8.5, and continuing stirring to obtain a uniform and stable suspension; s2, transferring the suspension into a reaction kettle, sealing the reaction kettle, putting the reaction kettle into a constant-temperature drying box, heating for 10-14 hours at 170-220 DEG C, naturally cooling, taking the reaction kettle out, carrying out vacuum filtration on the suspension in the reaction kettle, washing and drying to obtain sulfur-nitrogen co-doped graphene; s3, dissolving the sulfur-nitrogen co-doped graphene into an organic dispersing agent to prepare a solution with the concentration of 1mg / ml-5 mg / ml; carrying out ultrasonic oscillation and magnetic stirring to obtain a uniform and stable sulfur-nitrogen co-doped graphene suspension, soaking acleaned graphite felt electrode in the suspension for 20-48h, drying, and carrying out heat treatment on the dried graphite felt electrode in a tubular furnace at 700-1100 DEG C for 2-5h to obtain thesulfur-nitrogen co-doped graphene modified graphite felt composite electrode.

Description

technical field [0001] The invention relates to a graphite felt composite electrode and a preparation method thereof, in particular to a sulfur and nitrogen co-doped graphene-modified graphite felt composite electrode and a preparation method thereof. Background technique [0002] Vanadium redox flow battery (VRFB) is a promising large-scale energy storage system due to its long life and high energy utilization. Electrolyte, electrodes and membrane are the three main components of VRFB. The sluggishness of the redox reaction on the electrode on the membrane separation side limits the development of VRFB to some extent. with V 2+ / V 3+ Redox reactions compared to VO 2+ / VO 2 + Redox reactions are particularly slow. Therefore, catalyst materials with high electrocatalytic performance are required to improve VO 2+ / VO 2 + Electrochemical activity of redox couples. Chemical doping is considered to be an effective way to break the inertness of the carbon layer and chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96H01M8/18
CPCH01M4/8652H01M4/88H01M4/8882H01M4/96H01M8/188Y02E60/50
Inventor 李强孙红王俊楠白桉裕
Owner SHENYANG JIANZHU UNIVERSITY
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