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Pre-treatment method of composite electrode for TEMPO/MV flow cell

A liquid flow battery and composite electrode technology, applied in battery electrodes, regenerative fuel cells, circuits, etc., can solve the problems of low electrochemical activity, poor conductivity, and low specific surface area, and achieve increased specific surface area, stable performance, and increased reaction area effect

Active Publication Date: 2019-06-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a pretreatment method for composite electrodes for TEMPO / MV flow batteries, which can reduce graphite The interfacial contact resistance between fiber and graphene increases the conductivity and specific surface area of ​​the electrode material, improves the electrochemical activity of the electrode material, and thus improves the energy efficiency and voltage efficiency of the TEMPO / MV flow battery

Method used

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  • Pre-treatment method of composite electrode for TEMPO/MV flow cell
  • Pre-treatment method of composite electrode for TEMPO/MV flow cell
  • Pre-treatment method of composite electrode for TEMPO/MV flow cell

Examples

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Effect test

Embodiment 1

[0030] Heat a graphite felt electrode with a certain area in a 500W microwave oven for 1min, wash it with deionized water, and dry it in an oven at 80°C for 12h. Add 10ml of ethylenediamine to 50ml of deionized water, and completely immerse the dried graphite felt electrode in the aqueous solution of ethylenediamine. After 12 hours, put it into a hydrothermal reaction kettle containing 2mg / L graphene oxide and 10mL ethylenediamine solution, react at 180°C for 12 hours, and then cool to room temperature. Take out the graphite felt with three-dimensional graphene, put it into a freeze dryer and freeze-dry it for 24 hours to obtain the target electrode material. In order to test the electrochemical performance of the electrode, the electrode was assembled into a TEMPO / MV flow battery for charge and discharge tests. At a current density of 100mA / cm2, the voltage efficiency of the battery was 92%, and the energy efficiency was 95%.

Embodiment 2

[0032] Heat a graphite felt electrode with a certain area in a 500W microwave oven for 5min, wash it with deionized water, and dry it in an oven at 100°C for 6h. Add 8ml of ethylenediamine to 50ml of deionized water, and completely immerse the dried graphite felt electrode in the aqueous solution of ethylenediamine. After 10 hours, put it into a hydrothermal reaction kettle containing 2mg / L graphene oxide and 8mL ethylenediamine solution, react at 165°C for 15 hours, and then cool to room temperature. Take out the graphite felt with three-dimensional graphene, put it into a freeze dryer and freeze-dry it for 24 hours to obtain the target electrode material. In order to test the electrochemical performance of the electrode, the electrode was assembled into a TEMPO / MV flow battery for charge and discharge tests, at 150mA / cm 2 Under the current density, the voltage efficiency of the battery is 93%, and the energy efficiency is 94%.

Embodiment 3

[0034] Heat a carbon paper electrode with a certain area in a 500W microwave oven for 1min, wash it with deionized water, and dry it in an oven at 80°C for 6h. Add 4ml of ethylenediamine to 50ml of deionized water, and completely immerse the dried carbon paper electrode in the aqueous solution of ethylenediamine. After 6 hours, put it into a hydrothermal reaction kettle containing 2mg / L graphene oxide and 8mL ethylenediamine solution, react at 165°C for 15 hours, and then cool to room temperature. Take out the carbon paper electrode with three-dimensional graphene, and put it into a freeze dryer for 24 hours to freeze-dry to obtain the target electrode material. In order to test the electrochemical performance of the electrode, the electrode was assembled into a TEMPO / MV flow battery for charge and discharge tests, at 50mA / cm 2 Under the current density, the battery has a voltage efficiency of 90% and an energy efficiency of 91%.

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Abstract

The invention relates to a pre-treatment method of a composite electrode for a TEMPO / MV flow cell. The pre-treatment method specifically comprises the following steps: firstly placing carbon electrodematerial in a domestic microwave oven (the power is at 300W to 800W) to treat for 1-10min, cleaning, and then placing in an aqueous solution containing ethidene diamine to soak for 12-24h, and then placing the soaked graphite felt in a hydrothermal reaction still containing graphene oxide and ethidene diamine mixed aqueous solution, reacting for 12-24h at 180 DEG C, freezing and drying to obtainthe electrode material for TEMPO / MV flow cell. The hydrophily of the graphite felt is increased, the binding force of the three-dimensional graphene and the graphite fiber is enhanced, the electrochemical activity of the electrode material is improved, and the energy efficiency and the voltage efficiency of the TEMPO / MV flow cell are improved.

Description

technical field [0001] The invention relates to an electrode material for a TEMPO / MV flow battery, in particular a pretreatment method for a three-dimensional graphene / carbon composite electrode material for a TEMPO / MV flow battery. Background technique [0002] Water-soluble organic redox couple flow batteries have become the forefront of flow battery research because of their high efficiency, high cycle performance, low cost, and flexible design of capacity and power. [0003] Since the anthraquinone flow battery was proposed by Huskinson et al. of Harvard University in 2014, the research on using water-soluble organic redox couples to replace all-vanadium flow batteries has gained widespread attention. TEMPO / MV flow battery refers to the use of cheap and stable methyl viologen (MV) as the anolyte solution, and tetrahydroxytetramethylpiperidine oxide (4-HO-TEMPO) as the catholyte solution , using mild NaCl as the supporting electrolyte. Its battery is composed of a batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCY02E60/50
Inventor 黄成德李新宇高帆帆
Owner TIANJIN UNIV
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