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Alkaline aqueous mixed flow battery based on electroactive phenazine derivative negative electrode

A mixed liquid and flow battery technology, applied in the direction of regenerative fuel cells, fuel cells, battery electrodes, etc., can solve the problems of low specific capacity of solid-state electroactive organic molecular electrodes, and achieve high rate performance, high specific capacity and effect.

Active Publication Date: 2021-03-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main disadvantage of the aqueous flow battery based on solid-state electroactive organic molecules in the prior art is that the specific capacity of the solid-state electroactive organic molecular electrode is relatively low. The theoretical specific capacity of the tetrapyridylphenazine in the patent CN110867587A is only 128.8mAh / g. Its actual specific capacity at a current density of 1A / g is lower than 90mAh / g (J.Mater.Chem.A,2020,8,6874)

Method used

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  • Alkaline aqueous mixed flow battery based on electroactive phenazine derivative negative electrode
  • Alkaline aqueous mixed flow battery based on electroactive phenazine derivative negative electrode
  • Alkaline aqueous mixed flow battery based on electroactive phenazine derivative negative electrode

Examples

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Effect test

Embodiment 1

[0036] Synthesis and Electrochemical Properties of Anode Material 5,6,11,12,17,18-hexaazatrinaphthalene

[0037] 5,6,11,12,17,18-hexaazatrinaphthalene was synthesized by the Schiff base condensation reaction of cyclohexanone and 1,2-phenylenediamine (Acta Cryst.2001, E57, o242-o244). Cyclohexanone octahydrate (0.8 mmol) and 1,2-phenylenediamine (2.6 mmol) were mixed and co-dissolved in 50 mL of absolute ethanol. After refluxing for 12 hours under a nitrogen atmosphere, cool to room temperature. The initial product was collected by vacuum filtration as an orange solid. Recrystallized with chloroform, washed with water, ethyl acetate and acetone in sequence, and dried in vacuum at 60°C for 24 hours to obtain the product with a yield of about 78%.

[0038] The electrochemical properties of 5,6,11,12,17,18-hexaazatrinaphthalene were characterized by cyclic voltammetry. Mix 2 mg of 5,6,11,12,17,18-hexaazatrinaphthalene and 2 mg of Ketjen Black (Ketjen Black) carbon powder, add 0...

Embodiment 2

[0041] Example 2 Synthesis and electrochemical properties of negative electrode material 1,5,9-tribromo-5,6,11,12,17,18-hexaazatrinaphthalene

[0042]The synthetic method of 1,5,9-tribromo-5,6,11,12,17,18-hexaazatrinaphthalene is the same as that of 15,6,11,12,17,18-hexaazatrinaphthalene in Example 1 Trinaphthalene. Cyclohexaone octahydrate (0.8 mmol) and 1,2-diamino-3-bromobenzene (2.6 mmol) were mixed and co-dissolved in 50 ml of absolute ethanol. After reflux reaction under nitrogen atmosphere for 12 hours, it was cooled to room temperature. The initial product was collected by vacuum filtration as an orange solid. Recrystallized with chloroform, washed with water, ethyl acetate and acetone in sequence, and dried in vacuum at 60°C for 24 hours to obtain the product with a yield of about 65%.

[0043] image 3 It is the H NMR spectrum of 1,5,9-tribromo-5,6,11,12,17,18-hexaazatrinaphthalene. The electrochemical properties of 1,5,9-tribromo-5,6,11,12,17,18-hexaazatrinapht...

Embodiment 3

[0045] Example 3 negative electrode material 1,2:3,4-dibenzophenazine, dibenzo[a,c]phenazine-11-amine and tribenzo[a,c,i]-phenazine-10, Electrochemical properties of 15-diketones

[0046] 1,2:3,4-Dibenzophenazine, dibenzo[a,c]phenazin-11-amine and tribenzo[a,c,i]-phenazine were studied by cyclic voltammetry (CV) Electrochemical properties of oxazine-10,15-dione. The preparation and electrochemical testing steps of the working electrode are the same as in Example 1.

[0047] Figure 5 It is the cyclic voltammogram of 1,2:3,4-dibenzophenazine in 1mol / L KOH. The CV diagram of 1,2:3,4-dibenzophenazine shows a pair of reversible redox peaks with a standard equilibrium potential of -0.78V.

[0048] Figure 6 It is the cyclic voltammogram of dibenzo[a,c]phenazin-11-amine in 1mol / L KOH. The CV plot of dibenzo[a,c]phenazin-11-amine showed a pair of well-shaped redox peaks with a standard equilibrium potential of -0.825V.

[0049] Figure 7 is the cyclic voltammogram of tribenzo...

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Abstract

The invention belongs to the field of new energy, and relates to an aqueous flow battery, in particular to an alkaline aqueous mixed flow battery based on an electroactive phenazine derivative negative electrode. A negative electrode of the alkaline aqueous mixed flow battery is an insoluble phenazine derivative with redox activity, a supporting electrolyte of the negative electrode is strong base, a diaphragm is an ion conductive membrane, a positive electrode active electrolyte is ferrocyanide, and a positive electrode is a carbon-based conductive material. The aqueous mixed flow battery hasthe advantages of low unit cost, long cycle life, high specific capacity, safety, environmental protection and the like, and has a wide application prospect in the fields of large-scale power storageof renewable energy and peak regulation of a power grid.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a water system flow battery, in particular to an alkaline water system mixed flow battery based on an electroactive phenazine derivative negative electrode. Background technique [0002] The use of abundant renewable energy in nature, such as solar energy, wind energy and tidal energy to generate electricity, is clean and environmentally friendly, and is the only way for the future society to achieve sustainable development of energy supply and demand. However, this type of energy has inherent limitations, such as obvious regionality and intermittency, so it is required to be equipped with a high-efficiency battery system to adjust the surplus and shortage, smooth the peak-valley difference of the power grid, and reduce energy waste (Renew.Sust.Energ.Rev.2009 , 13, 1513). [0003] As a large-scale electrochemical energy storage system, flow batteries realize energy storage and conversion...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/18
CPCH01M4/9008H01M8/188Y02E60/50
Inventor 曹剑瑜王征许娟
Owner CHANGZHOU UNIV
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