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Tetrathiafulvalene-based viologen derivative as well as preparation method and application thereof in flow battery system

A technology of tetrathiafulvalene and derivatives, which is used in regenerative fuel cells, fuel cells, circuits, etc., to achieve the effects of improving molecular stability, broadening applications, and enriching species

Active Publication Date: 2021-12-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the problems existing in the prior art, the present invention provides a class of viologen derivatives based on tetrathiafulvalene and its preparation method and application in the liquid flow battery system, which solves the problem that the viologen derivatives can only be used as The water solubility of the anolyte and TTF can effectively improve the application performance of the viologen system in the field of neutral aqueous organic flow batteries, and can further expand the application field of viologen derivatives

Method used

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  • Tetrathiafulvalene-based viologen derivative as well as preparation method and application thereof in flow battery system
  • Tetrathiafulvalene-based viologen derivative as well as preparation method and application thereof in flow battery system
  • Tetrathiafulvalene-based viologen derivative as well as preparation method and application thereof in flow battery system

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preparation example Construction

[0056] The preparation method of a class of viologen derivatives based on tetrathiafulvalene of the present invention comprises the following steps:

[0057] Step 1: Bromide (C 7 h 6 Synthesis of BrNO HBr) (compound 1):

[0058] In the air, take 4-acetylpyridine (4-acetylpyridine 3mmol), HBr solution (containing HBr77mmol) with a mass fraction of 40%, and liquid bromine (32mmol) in a round-bottomed flask, and the molar ratio of the three is 1 : 25.7: 10.7, fully stirred, and fully reacted in an ice-water bath at 0-5°C for 1.5-2 hours.

[0059] Post-treatment process: quickly vacuum filter the reaction solution, wash with 2-5mL distilled water, the color of the product will gradually become lighter, transfer the obtained light yellow solid to a 100mL round-bottomed flask, and add a magnet to stir, 100mL Saturated sodium thiosulfate solution was transferred to a 250mL branch bottle, connected to a mechanical pump, a 100mL round bottom flask with product and a temperature cont...

Embodiment 1

[0081] 1, the preparation method of a class of viologen derivatives based on tetrathiafulvalene of the present invention comprises the following steps:

[0082] Step 1: Bromide (C 7 h 6 BrNO HBr) synthesis (compound 1);

[0083] Take a 50mL round bottom flask, wash and dry it for later use. Prepare plenty of ice cubes and 100 mL of saturated sodium thiosulfate solution in advance. Use a syringe to extract 3.63g (3mmol) 4-acetylpyridine (preserved at low temperature) into a round-bottomed flask, then place the round-bottomed flask in an ice-water bath, keep stirring, and then slowly add 10.90mL of HBr with a mass fraction of 40% The solution (containing HBr77mmol) forms a mixed solution. During this process, it should be added dropwise, the flow rate should be maintained at 1s / drop, and the stirring should be accelerated to prevent solidification. Use a long needle to draw 1.65mL of liquid bromine (32mmol) and quickly transfer it to a 10mL separatory funnel (remove the liqu...

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Abstract

The invention discloses a tetrathiafulvalene-based viologen derivative as well as a preparation method and application thereof in a flow battery system. An electron withdrawing group viologen compound is combined with a strong electron donating group tetrathiafulvalene, and terminal N atoms are subjected to ionization modification, namely hydrophilic groups and other alkyl chain substituents are introduced, so that the whole electron cloud distribution of molecules is changed, an acceptor-donor-acceptor type material is obtained, the reduction threshold value of the material is greatly reduced, polar functional groups quaternary ammonium salt and hydroxyl are introduced, the solubility and the conductivity are improved, the conjugacy of viologen derivatives is widened, the structural stability is improved, the electrode potential (0.70 V and 0.66 Vs NHE) is increased, the application of the all-viologen derivative as a cathode electrolyte in a neutral aqueous organic flow battery is realized, and rapid intramolecular electron transfer is realized, so that the viologen derivative has outstanding dynamic performance.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for liquid flow batteries, and specifically relates to a viologen derivative based on tetrathiafulvalene, a preparation method thereof, and an application in a flow battery system. Background technique [0002] Wind energy and solar energy, which are clean energy sources, have randomness, volatility, and intermittency, which seriously threaten the smooth operation of the power grid system. Large-scale energy storage technology can realize peak shaving and valley filling, smooth output, frequency modulation and amplitude modulation, and ensure the stable operation of the power grid. Therefore, the development and application of large-scale energy storage technology is the key to promote the development of new energy. Among them, electrochemical energy storage has a larger discharge time and capacity range, and has the advantages of pollution-free operation, high energy efficiency, low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D409/14H01M8/18
CPCC07D409/14H01M8/188H01M2300/0025Y02E60/50
Inventor 何刚刘旭张旭日张思坤周晨捷
Owner XI AN JIAOTONG UNIV
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