Superhydrophilic material (graphene oxide/phytic acid) modified electrode material for energy-storing flow battery

A technology of electrode material and flow battery, which is applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of cumbersome preparation process, high cost, and inapplicability to large-scale application of all-vanadium redox flow batteries, etc. Catalytic activity, improved electrical conductivity, beneficial effects on lateral transport and longitudinal migration

Active Publication Date: 2018-09-14
HUNAN YINFENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process is cumbersome and the cost is too high, whic...

Method used

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  • Superhydrophilic material (graphene oxide/phytic acid) modified electrode material for energy-storing flow battery
  • Superhydrophilic material (graphene oxide/phytic acid) modified electrode material for energy-storing flow battery
  • Superhydrophilic material (graphene oxide/phytic acid) modified electrode material for energy-storing flow battery

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preparation example Construction

[0037] As mentioned above, the present invention provides a method for preparing an electrode material modified with a superhydrophilic material for an all-vanadium redox flow battery as described above, comprising the following steps:

[0038] Step 1: preparing graphene oxide solution;

[0039] Step 2: Put the graphene oxide solution obtained in step 1 into a reactor, add phytic acid solution, mix and stir evenly, add carbon-based materials, and ultrasonically mix to obtain a solid-liquid mixture;

[0040] Step 3: The solid-liquid mixture in step 2 is placed in a reactor for hydrothermal reaction, cooled to room temperature, and the electrode material modified by the superhydrophilic material is obtained.

[0041] In order to measure the high-temperature stability of the electrode material of the present invention, the electrode material obtained in step 3 can be placed in a tube furnace (which can be an argon atmosphere) or a muffle furnace after drying, and the electrode ma...

Embodiment 1

[0052] Take 0.3g of graphite powder with a purity of 99.9999%, grind it with an agate mortar for 30 minutes, mix 1.8g of potassium permanganate at the same time, add it to a beaker, add 36ml of concentrated sulfuric acid and 4ml of phosphoric acid, and keep the mixed solution at 35°C to 40°C for reaction 2 hours, stirred in a water bath at 50°C for 12 hours, cooled to room temperature, added 40ml of ice water, slowly added dropwise 3ml of 30% H 2 o 2 until no bubbles are formed. Put the above solution in a centrifuge tube, add 20ml 30% HCl, centrifuge at 6000rpm for 20min, pour out the supernatant, repeat this process three times, add 20m deionized water to the centrifuge tube, centrifuge for 20min, and rotate at 8000r / min, repeat this process until it is washed to neutrality, place it in a beaker, add a certain amount of deionized water, ultrasonicate at room temperature for 2 hours, and centrifuge at 8000rpm for 20min to obtain graphene oxide precipitation.

[0053] Take ...

Embodiment 2

[0061] Put 0.5g of graphite powder and 0.375g of sodium nitrate in a beaker, add 37.5ml of concentrated sulfuric acid and stir in an ice bath, slowly add 2.2g of potassium permanganate, continue to stir in an ice bath for 2 hours, stir vigorously at room temperature for 5 days, add 70mL of 5wt %H 2 SO 4 Stir at 98°C for 1 hour, continue to stir at 98°C for 1 hour, add 2 mL of H 2 o 2 (30wt%) until no bubbles are generated, stir at room temperature for 2 hours, place the above solution in a centrifuge tube, add 20ml of 30% HCl, centrifuge at 6000rpm for 20min, pour out the supernatant, repeat this process three times, pour into the centrifuge tube Add 20m deionized water to the solution, centrifuge for 20 minutes, and rotate at 8000r / min. Repeat this process until the washing is neutral. Put it in a beaker, add a certain amount of deionized water, and ultrasonicate for 2 hours at room temperature. Centrifuge for 20min to obtain graphene oxide precipitate.

[0062] Take the ...

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Abstract

The invention relates to a superhydrophilic material modified electrode material for an energy-storing flow battery as well as a preparation method and application thereof. The electrode material takes a carbon-based material as a matrix; and the matrix comprises a graphene oxide superhydrophilic material which is formed by graphene oxide and phytic acid and has a three-dimensional structure. In the electrode material, the graphene oxide increases the reaction active sites and the specific surface area of graphite felt fiber, and the phytic acid with six phosphate groups are crosslinked with different graphene oxide layers to form a three-dimensional structure, so that the electric conductivity of the system is improved, transmission of protons and vanadium ions on graphite felt is benefited, charge transfer resistance and mass transfer resistance are reduced, the electrocatalytic activity of the whole electrode is improved, and the energy efficiency and the discharging capacity of thewhole battery are greatly improved.

Description

technical field [0001] The invention relates to an electrode material for an energy storage liquid flow battery and a preparation method and application thereof, in particular to an electrode material for an all-vanadium flow battery and a preparation method and application thereof. Background technique [0002] Redox flow battery (RFB) has attracted much attention in the field of large-scale energy storage technology due to its unique performance and flexible design. The electrolyte (electrode reaction active substance) is stored in the external storage tank of the stack, and the electrolyte is continuously transported to the surface of the electrode by the action of the pump to react. The capacity of the battery can be determined simply by the size of the electrolyzer. Among them, the all-vanadium redox flow battery is considered to be one of the most promising energy storage technologies, which is mainly composed of vanadium electrolyte, separator, electrode and current ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/96H01M4/88H01M4/90H01M8/18
CPCH01M4/8652H01M4/8673H01M4/88H01M4/9083H01M4/96H01M8/188Y02E60/50
Inventor 吴雄伟凌苇吴雪文胡永清邓奇尹兴荣刘俊谢浩黄鹏
Owner HUNAN YINFENG NEW ENERGY
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