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Metal organic framework crystal film for all-vanadium redox flow battery

A metal-organic framework and liquid flow battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., to achieve synchronous improvement of ion selectivity and mass transfer performance, and stable charge-discharge cycle effects

Pending Publication Date: 2022-01-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on applying MOF materials to VFBs mostly focuses on dispersing materials in polymer matrix, using porous materials to block water channels for ion transport, thereby improving ion selectivity, and there is no MOF polycrystalline membrane applied to VFBs. Research

Method used

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  • Metal organic framework crystal film for all-vanadium redox flow battery
  • Metal organic framework crystal film for all-vanadium redox flow battery
  • Metal organic framework crystal film for all-vanadium redox flow battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] MOF-801 crystal synthesis: 3.20g ZrOCl 2 ·8H 2 O and 1.16g of fumaric acid were dissolved in a mixed solvent of DMF / formic acid (40mL / 14mL). After the solution was ultrasonically dissolved, the uniformly dispersed solution was slowly poured into the reactor, and the reactor was sealed and reacted at 130°C for 6h. Cool down after the reaction, take out the sample, wash it three times with DMF, wash it three times with methanol, and soak it in methanol solution for 3 days, and finally dry it in vacuum at 60°C for 24 hours, and collect the MOF-801 white powder ( figure 1 a)

[0044] MOF-808 crystal synthesis: 0.54g ZrOCl 2 ·8H 2 O and 0.11g of trimesic acid were dissolved in a mixed solvent of DMF / formic acid (25mL / 25mL). After the solution was ultrasonically dissolved, the uniformly dispersed solution was slowly poured into the reactor, and the reactor was sealed and reacted at 130°C for 48h. Cool down after the reaction, take out the sample, wash it three times with ...

Embodiment 2

[0046] Preparation of MOF-801 membrane

[0047] Select 1mm porous α-Al 2 o 3 The ceramic sheet is used as a support, and it is pretreated before use: first, use the whole body and immerse it in concentrated hydrogen peroxide for 2 hours, take it out and rinse it with deionized water, put it into the reaction kettle, add a certain amount of deionized water, and heat it at 120°C , heated for 2 hours, and dried at 60°C for 12 hours after taking it out. Prepare 0.1wt% MOF-801 seed crystal solution. Then, using the dipping and pulling method, the side of the support surface pretreated was horizontally immersed in the seed liquid for 10 seconds, then dried at room temperature for 10 minutes, repeated 3 times, and placed in an oven at 60°C for 12 hours. Then the support (with the seed crystal side down) was horizontally fixed on the polytetrafluoroethylene support and placed at the bottom of the reactor. 3.20g ZrOCl 2 ·8H 2 O and 1.16g of fumaric acid were dissolved in a mixed ...

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Abstract

The invention provides a metal organic framework crystal film for an all-vanadium redox flow battery, and belongs to the technical field of vanadium redox flow batteries. The crystal film is a compact and uniform MOF film prepared from an MOF material. Due to a window structure of a sub-nanometer size and a hydrogen bond network formed by adsorbed water molecules, the MOF membrane shows excellent ion screening performance and mass transfer rate. When the diaphragm is applied to VFB as a flow battery diaphragm for further detection of the electrochemical performance of the diaphragm, stable charge-discharge cycle can be carried out. The invention provides a new thought for the development of the flow battery diaphragm.

Description

technical field [0001] The invention relates to a metal-organic framework polycrystalline film applied to an all-vanadium redox flow battery for the first time, and belongs to the technical field of vanadium redox flow batteries. Background technique [0002] Vanadium redox flow battery (VFB) is regarded as one of the ideal large-scale energy storage devices because of its advantages of high safety, low cost, adjustable capacity, short construction period and long cycle life, and is widely used in power grid regulation. Peak, backup energy, etc. The battery separator is one of the important components, which mainly serves to separate the positive and negative electrolytes, block the cross-exchange of active materials, and selectively permeate ions (such as: H + ) to achieve the purpose of storing and releasing electric energy, therefore, the performance of the separator will directly affect the charging and discharging efficiency of the entire battery system. At present, t...

Claims

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Application Information

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IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/188Y02E60/50
Inventor 徐至黄康曹洪岩
Owner NANJING UNIV OF TECH
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