A kind of method for preparing active graphite felt electrode by electrolysis

A technology of graphite felt and electrolysis method, which is applied in the field of preparation of active graphite felt electrodes by electrolysis method, can solve the problems such as poor electrode activity, and achieve the effects of low price, improved electrochemical performance, and improved efficiency

Active Publication Date: 2021-12-14
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon-based graphite felt materials are low in cost and good in stability, but the activity of this type of electrode is not very good. In order to improve the reaction rate of the electrode surface, it needs to be effectively pretreated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing active graphite felt electrodes by electrolysis, using graphite felt as a base material, introducing oxygen functional groups and nitrogen functional groups to positive and negative graphite felts by means of constant voltage electrolysis in an ammonium salt solution to obtain active graphite for flow batteries Felt electrode material, the specific operation steps are as follows:

[0021] 1) Add an appropriate amount of water to analytically pure ammonium salt crystals, stir magnetically for 30 minutes until completely dissolved, and obtain a 1mol / L ammonium salt solution;

[0022] 2) Immerse the clean graphite felt into the prepared 1mol / L ammonium salt solution, and use an ultrasonic cleaner to ultrasonically disperse at a frequency of 50kHz for 30min;

[0023] 3) Connect two impregnated graphite felts of 30mm×30mm to the positive and negative poles of the constant voltage power supply and submerge them in the ammonium salt solution, apply a con...

Embodiment 2

[0026] The difference from Example 1 is that the impregnated graphite felt is respectively connected to the positive and negative poles of the constant voltage power supply and submerged in the ammonium salt solution, and a constant voltage of 1.2V is applied to electrolyze the ammonium salt solution for 30 minutes, and the electrodes are removed and placed in the ammonium salt solution. Dry at 80°C for 12 hours to obtain an active graphite felt electrode for a flow battery.

[0027] The active graphite felt prepared in this example is used as a working electrode in the electrochemical test for positive and negative cyclic voltammetry and AC impedance tests, and the peak oxidation current value of the positive electrode is 800mA / cm 2 , Impedance is 0.070Ω·cm 2 Compared with the base graphite felt, the peak current value is increased by 2.96 times, and the impedance is reduced by 44.88%; the negative electrode oxidation peak current value is 340mA / cm 2 , the impedance is 0.145...

Embodiment 3

[0029] The difference from Example 1 is that the impregnated graphite felt is respectively connected to the positive and negative poles of the constant voltage power supply and submerged in the ammonium salt solution, and a constant voltage of 1.2V is applied to electrolyze the ammonium salt solution for 45 minutes, and the electrodes are removed and placed in the ammonium salt solution. Dry at 80°C for 12 hours to obtain an active graphite felt electrode for a flow battery.

[0030] The active graphite felt prepared in this example is used as the working electrode in the electrochemical test for positive and negative cyclic voltammetry and AC impedance tests, and the positive electrode oxidation peak current value is 760mA / cm 2 , the impedance is 0.047Ω·cm 2 Compared with the base graphite felt, the peak current value is increased by 2.81 times, and the impedance is reduced by 62.99%; the negative electrode oxidation peak current value is 280mA / cm 2 , the impedance is 0.032Ω...

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Abstract

The invention relates to a method for preparing an active graphite felt electrode by electrolysis. Using graphite felt as a base material, oxygen functional groups and nitrogen functional groups are introduced into the graphite felt by means of constant voltage electrolysis in an ammonium salt solution to obtain an iron-chromium flow battery. Active graphite felt positive and negative electrode materials: prepare 0.5‑5mol / L ammonium salt solution; impregnate graphite felt into the ammonium salt solution; In the salt solution, apply a constant voltage of 0.5-5.0V to electrolyze the ammonium salt solution, and dry it at 60-80°C. The advantages are: simple and fast operation, low price, and low requirements on the preparation environment, which reduces the preparation cost of the flow battery.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, in particular to a method for preparing active graphite felt electrodes by electrolysis. Background technique [0002] With the continuous improvement of people's living standards, people's demand for energy is increasing, especially the demand for electricity, which leads to an increase in coal consumption and a sharp rise in sulfur dioxide emissions, of which power plants and industrial boilers account for the majority . In order to avoid the continued deterioration of environmental pollution, it is necessary to research and develop new energy sources such as wind energy and solar energy to generate electricity, which promotes the development of secondary batteries. Redox flow batteries have the advantages of fast start-up speed, large energy storage capacity, high energy efficiency, safety and reliability, green and pollution-free, and are one of the best choices for energy storage batter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M8/188H01M4/96H01M4/8825Y02E60/50
Inventor 张欢陈娜罗旭东袁琦
Owner UNIV OF SCI & TECH LIAONING
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