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Electrode material for all-vanadium redox flow battery constructed by boron-doped aerogel, preparation method and application thereof

A flow battery and electrode material technology, which is applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of unsuitable all-vanadium flow batteries, limited electrode performance, cumbersome preparation process, etc., and achieve the improvement of electrocatalysis Reversibility of activity and reaction kinetics, low cost of raw materials, and simple process

Active Publication Date: 2020-09-04
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of improving electrode performance is still limited, or the entire preparation process is cumbersome and the cost is too high, and most importantly, it is not suitable for all-vanadium redox flow batteries

Method used

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  • Electrode material for all-vanadium redox flow battery constructed by boron-doped aerogel, preparation method and application thereof
  • Electrode material for all-vanadium redox flow battery constructed by boron-doped aerogel, preparation method and application thereof
  • Electrode material for all-vanadium redox flow battery constructed by boron-doped aerogel, preparation method and application thereof

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preparation example Construction

[0043] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0044] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0046] Dissolve 1g of polyvinyl alcohol in 100ml of deionized water, heat to 95°C for about 2 hours to disperse evenly, soak 3g of graphite felt electrode in the polyvinyl alcohol solution, and disperse evenly by ultrasonic to obtain a mixed system. Dissolve 3g of potassium borate in 10ml of deionized water, and ultrasonically dissolve it fully. During the vigorous stirring process, the potassium borate solution was slowly added dropwise to the above mixing system to cause gelation in the carbon-based material. After 12 hours of reaction time, the carbon-based material was taken out and frozen with liquid nitrogen. After 24 hours Freeze dry under vacuum. The carbon-based material after vacuum freeze-drying was placed in a tube furnace, and calcined in an argon atmosphere at 800°C for 2 hours, the heating rate was 5°C / min, cooled to room temperature, and the carbon-based material was taken out with dilute hydrochloric acid and deionized water Washed three times respectively, pla...

Embodiment 2

[0053] Dissolve 2g of polyethylene oxide in 100ml of dedimethylformamide, heat to 60°C for about 2 hours to disperse evenly, soak 3g of graphite felt electrode in the polyethylene oxide solution, and disperse uniformly by ultrasonic to obtain a mixed system. Dissolve 5g of boric acid in 10ml of deionized water, and ultrasonically dissolve it fully. During the vigorous stirring process, the boric acid solution was slowly added dropwise to the above mixing system to cause the gelation process to occur in the carbon-based material. After 12 hours of reaction time, the carbon-based material was taken out and frozen with liquid nitrogen. After 24 hours of vacuum Freeze dried. The carbon-based material after vacuum freeze-drying was placed in a tube furnace, and calcined in an argon atmosphere at 900°C for 2 hours, the heating rate was 2°C / min, cooled to room temperature, and the carbon-based material was taken out with dilute hydrochloric acid and deionized water. Washed three tim...

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Abstract

The invention provides an electrode material for an all-vanadium redox flow battery constructed by boron-doped aerogel, a preparation method and application thereof. According to the electrode material, a linear polymer is used as a skeleton, and a boron-doped aerogel network is generated in situ in a carbon-based material by using boric acid or borate as a cross-linking agent, so that the interface reaction area and catalytic active sites of the electrode are greatly improved, and the ion transport and charge transfer are improved so as to improve the electrochemical activity of the electrode, reduce the electrochemical polarization and promote the voltage efficiency and the energy efficiency of the battery. According to the prepared electrode material, the porous structure and the high specific surface area of the aerogel are utilized, the contact area of the electrode and the electrolytic solution is increased, the electrolytic solution can be conveniently conveyed and diffused in the electrode, and charge transfer is promoted; and due to boron doping, more reaction active sites can be introduced into the carbon-based material, and the electrocatalytic activity and reaction dynamic reversibility are improved.

Description

technical field [0001] The invention relates to the field of preparation and application of an electrode material for an energy storage liquid flow battery, in particular to an electrode material for an all-vanadium redox flow battery constructed of boron-doped aerogel, a preparation method and application thereof. Background technique [0002] Based on the current shortage of chemical energy and a series of environmental pollution problems caused by it, the development of renewable and clean energy has become an inevitable choice. However, renewable clean energy such as solar and wind energy is intermittent and unstable due to factors such as geography and climate, and large-scale energy storage systems are required to provide stable energy output. Due to its flexible system design, relatively independent output power and capacity, long service life, high current charging and discharging, and stable overall performance, flow batteries have become one of the most promising l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96H01M8/18
CPCH01M4/96H01M8/188Y02E60/50
Inventor 吴雄伟凌苇董新荣邓奇周鹏晟王泓睿马强许雨婷陈慧
Owner HUNAN AGRICULTURAL UNIV