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Preparation method and application of sodium vanadium oxyfluorophosphate/graphene composite electrode material

The technology of sodium vanadyl fluorophosphate and sodium vanadyl phosphate is applied in the field of high-energy electrochemistry, and can solve the problems of adsorption capacity effect, electrode oxidation, and common ion efficiency affecting charge efficiency, etc.

Inactive Publication Date: 2021-07-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional carbon-based electrodes often have problems such as long-term cycle prone to electrode oxidation, adsorption capacity is affected by the specific surface area of ​​the material, and common ion efficiency affects charge efficiency. Therefore, new electrode materials are urgently needed for the desalination process.

Method used

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  • Preparation method and application of sodium vanadium oxyfluorophosphate/graphene composite electrode material
  • Preparation method and application of sodium vanadium oxyfluorophosphate/graphene composite electrode material
  • Preparation method and application of sodium vanadium oxyfluorophosphate/graphene composite electrode material

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Effect test

Embodiment 1

[0042] Preparation of sodium vanadyl fluorophosphate / graphene material:

[0043] (1) Weigh ammonium dihydrogen phosphate, ammonium vanadate, sodium carbonate, and sodium fluoride to be 0.46g, 0.468g, 0.212g, and 0.084g, respectively, and add them to 8mL with a concentration of 4g L -1 A stable solution A is formed in the graphene solution;

[0044] (2) Put the solution A obtained in step (1) on a magnetic stirrer, add 40 mL of N,N-dimethylformamide dropwise, adjust the pH to 7 with nitric acid, and then transfer it to a hydrothermal kettle. After heating for 10 hours, the obtained product was washed with deionized water and ethanol, and dried in a vacuum oven to obtain a black powder that was sodium fluorovanadyl phosphate / graphene composite material. The SEM image of the target product sodium vanadyl fluorophosphate / graphene material figure 1 (b) shown. The SEM image of the purchased activated carbon is as follows figure 1 As shown in (a): It is obvious that the size leve...

Embodiment 2

[0046] Application of sodium vanadyl fluorophosphate / graphene composite in flow electrode capacitive deionization technology.

[0047] Preparation of sodium vanadyl fluorophosphate / graphene electrode and activated carbon flow electrode:

[0048] After grinding the sodium vanadyl fluorophosphate / graphene composite material prepared in Example 1, mix it with carbon black at a mass ratio of 8:1, add it to a 1 g / L NaCl solution and stir for about 6-12 hours A uniformly mixed flow electrode slurry is obtained; the preparation method of the activated carbon electrode is similar to the above, and the sodium vanadyl fluorophosphate / graphene can be replaced by the purchased activated carbon.

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Abstract

The invention discloses a preparation method and application of a sodium vanadium oxyfluorophosphate / graphene composite electrode material. The method is based on the principle that a Faraday capacitor and a double-electric-layer capacitor store charges. In a flowing electrode capacitive deionization device, under the condition of certain voltage, one electrode adsorbs sodium ions by taking sodium vanadium oxyfluorophosphate / graphene compound flowing electrode slurry as a Faraday capacitor, and the other electrode adsorbs chloride ions by taking activated carbon as double-electric-layer capacitance flowing electrode slurry, so that sodium chloride is removed, and the purpose of desalting is achieved. By controlling the magnitude of the applied voltage, the material can adsorb chloride ions and sodium ions, the operation is simple, secondary pollution is avoided, and assistance of other chemical substances is not needed. The adsorption rate of a flowing capacitive deionization device composed of the sodium vanadium oxyfluorophosphate / graphene composite material and an activated carbon electrode to sodium chloride can reach 0.09 [mu]mol.cm<-2>.min<-1>, and the method is a desalination method with great prospects.

Description

technical field [0001] The invention belongs to the technical field of high-energy electrochemistry, and relates to the preparation of a sodium vanadyl fluorophosphate / graphene composite electrode material and its application in the flow electrode capacitive deionization technology. Background technique [0002] With the rapid increase of the world's population and the gradual intensification of environmental pollution, human beings are facing a severe crisis of drinking water safety. In addition, my country is also facing more and more serious water shortage problems. According to relevant data, my country's per capita fresh water possession is only 2,200 cubic meters, ranking 121st in the world, less than one-third of the world's per capita water resources, and one of the 13 countries with the most scarce per capita water resources in the world. However, my country's water consumption has maintained a high level for a long time, and water pollution has increased the propo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84H01G11/24H01G11/30H01G11/32
CPCH01G11/24H01G11/30H01G11/32H01G11/84Y02E60/13
Inventor 马杰程钰娟
Owner TONGJI UNIV
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