Modification method for carbon felt electrode for all-vanadium redox flow batteries

An all-vanadium redox flow battery and carbon felt technology, which is applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems that the degree of oxidation cannot be precisely controlled, the modification effect is not optimal, and the electrode materials are difficult to oxidize evenly. , to achieve the effect of improved electrochemical reversibility, uniform diffusion speed and fast diffusion speed

Inactive Publication Date: 2018-05-29
HUNAN YINFENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this modification method also has the following disadvantages: the process is complex and consumes a large amount of chemical agents, resulting in high cost, and due to the poor wettability of the carbon felt itself, it is difficult to ensure uniform oxidation of the electrode material and the degree of oxidation cannot be precisely controlled. The final modification effect is not optimal

Method used

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  • Modification method for carbon felt electrode for all-vanadium redox flow batteries
  • Modification method for carbon felt electrode for all-vanadium redox flow batteries
  • Modification method for carbon felt electrode for all-vanadium redox flow batteries

Examples

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Effect test

Embodiment 1

[0044] Take two carbon felts with a size of 4cm×8cm, immerse them in a beaker filled with absolute ethanol, then use an ultrasonic cleaner with a power of 5kHz to ultrasonically clean the carbon felts for 30min, take out the carbon felts and soak them in pure water for several times. Put into an oven and dry at 80°C for 12h.

[0045] Weigh the dried carbon felt to be 3.03g, so use a pipette gun to take 1.52ml of concentrated nitric acid and slowly inject it into the bottom of the inner tank of the reaction kettle, put the carbon felt into the upper opening of the glass sand core crucible, and then place the crucible Put it into the reaction kettle while avoiding direct contact between the carbon felt and concentrated nitric acid, then seal the reaction kettle and put the reaction kettle into the muffle furnace. The temperature of the furnace is raised to 200°C after 40 minutes and continues to be heated at this temperature for 300 minutes. , after cooling down to room temperat...

Embodiment 2

[0047] Take three carbon felts with a size of 4cm×8cm, immerse them in a beaker filled with absolute ethanol, and then use an ultrasonic cleaner with a power of 5kHz to ultrasonically clean the carbon felts for 30 minutes, take out the carbon felts and soak them in pure water for several times. Put into an oven and dry at 80°C for 12h.

[0048] The weight of the dried carbon felt is 4.69g, so take 4.69ml of concentrated nitric acid with a pipette gun and slowly inject it into the bottom of the inner tank of the reaction kettle, put the carbon felt into the upper opening of the glass sand core crucible, and then place the crucible Put it into the reaction kettle while avoiding direct contact between the carbon felt and concentrated nitric acid, then seal the reaction kettle and put the reaction kettle into the muffle furnace. The furnace temperature is raised to 180°C after 40 minutes and continues to heat at this temperature for 300 minutes , after cooling down to room tempera...

Embodiment 3

[0050] Take four carbon felts with a size of 4cm×8cm, immerse them in a beaker filled with absolute ethanol, and then use an ultrasonic cleaner with a power of 5kHz to ultrasonically clean the carbon felts for 30 minutes, take out the carbon felts and soak them in pure water for several times. Put into an oven and dry at 80°C for 12h.

[0051] Weigh the dried carbon felt to be 6.24g, so use a pipette gun to take 6.24ml of concentrated nitric acid and slowly inject it into the bottom of the inner tank of the reaction kettle, put the carbon felt into the upper opening of the glass sand core crucible, and then place the crucible Put it into the reaction kettle while avoiding the direct contact between the carbon felt and the concentrated nitric acid, then seal the reaction kettle and put the reaction kettle into the muffle furnace. The temperature of the furnace is raised to 150°C after 40 minutes and continues to be heated at this temperature for 300 minutes. , after cooling dow...

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Abstract

The invention provides a modification method for a carbon felt electrode for all-vanadium redox flow batteries. A carbon felt is immersed in absolute ethyl alcohol or acetone, ultrasonically treated,then washed clean with pure water and dried for later use; the dried carbon felt is put into a closed container and suspended over concentrated nitric acid solution in the closed container; the closedcontainer is heated, and high-temperature and high-pressure nitric acid vapor produced in the container is utilized to carry out gas-phase oxidation treatment on the carbon felt; after the carbon felt is cooled, absolute ethyl alcohol and pure water are respectively used for washing the carbon felt clean, and after drying, a modified carbon felt is obtained. The method is simple and practical, the electrocatalytic activity and stability of the carbon felt electrode are greatly increased, the surface oxidation of the carbon felt is more uniform and the oxidation degree can be accurately controlled by regulating the dosage of nitric acid, heating temperature and treatment time, in addition, a great deal of cost is reduced because the dosage of nitric acid is little and the problem of wastealmost does not exist, and therefore the modification method can be easily applied in practical production.

Description

technical field [0001] The invention relates to the technical field of production of all-vanadium redox flow batteries, in particular to a method for modifying carbon felt electrodes for all-vanadium redox flow batteries. Background technique [0002] All-vanadium redox flow battery, as a new type of green and environmentally friendly energy storage battery, conforms to the theme of sustainable development of the current society, and can be widely used as a large-scale stationary energy storage method. The electrode is one of the key components of the vanadium battery, and it is also the place where the vanadium battery reacts. Therefore, the active specific surface area and electrochemical stability of the electrode material directly determine the power density, energy efficiency and service life of the vanadium battery. Among many carbonaceous and metal materials, carbon felt is widely used as an electrode for commercial vanadium batteries because of its strong corrosion r...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/8878H01M4/96H01M8/188Y02E60/50Y02P70/50
Inventor 唐红梨尹兴荣吴雪文吴雄伟刘俊徐辉孙小生向小绢张洁彭礼胡永清
Owner HUNAN YINFENG NEW ENERGY
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