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Preparation method and application of iodide ion doping modified fe-mof bulk electrode material

A technology of electrode materials and iodide ions, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low Coulombic efficiency, slow reaction rate, and limited energy density of Fe-MOF materials, etc., and achieve a fast reaction process , the process is reversible, and the effect of high energy density

Active Publication Date: 2022-07-08
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problems of Fe-MOF material prepared by the preparation method in the prior art, such as limited energy density, slow reaction rate, and low coulombic efficiency caused by by-products in the electrochemical reaction process in the redox electrolyte. And provide a kind of preparation method of iodide ion doped modified Fe-MOF bulk electrode material

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  • Preparation method and application of iodide ion doping modified fe-mof bulk electrode material
  • Preparation method and application of iodide ion doping modified fe-mof bulk electrode material
  • Preparation method and application of iodide ion doping modified fe-mof bulk electrode material

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Embodiment 1

[0036] A preparation method of an iodide ion-doped modified Fe-MOF bulk electrode material, the specific steps are as follows:

[0037] (1) Weigh 1 mmol of ferric chloride and dissolve it in 10 mL of deionized water to form A solution, weigh 1 mmol of potassium ferrocyanide and dissolve it in 10 mL of deionized water to form B solution, and add 0.5 g polyethylene to the B solution. Pyrrolidone PVP templating agent, 1 mL sulfuric acid, 0.5 g trisodium citrate, wherein the relative molecular mass of polyvinylpyrrolidone PVP templating agent is 10000. The A and B solutions were stirred at room temperature for 5 minutes and then added to the hydrothermal tank for a hydrothermal reaction, wherein the mol ratio of the iron salt in the A solution to the potassium ferrocyanide in the B solution was 0.75:0.75; the hydrothermal reaction temperature was 60°C, and the reaction The time was 24 h; the products obtained from the reaction were collected and centrifuged for 3 times with a mixt...

Embodiment 2

[0042] A preparation method of an iodide ion-doped modified Fe-MOF bulk electrode material, the specific steps are as follows:

[0043] (1) Weigh 1 mmol of ferric sulfate and dissolve it in 10 mL of deionized water to generate solution A. Weigh 1 mmol of potassium ferrocyanide and dissolve it in 10 mL of deionized water to generate solution B. A and B solutions are stirred at room temperature for 60 minutes and then added In the inner tank of the hydrothermal kettle, the water is heated for 24 hours, and the temperature of the hydrothermal reaction is 60 °C. The molar ratio of ferric salt in solution A to potassium ferrocyanide in solution B is 0.75:0.75; the product obtained from the reaction is collected, and centrifuged for 4 times with a mixture of ethanol and deionized water, and finally a blue product is obtained, which is Fe-MOF block shape electrode material.

[0044] (2) Grind the Fe-MOF electrode material in step (1) for 5 minutes, put it into a plasma etching machi...

Embodiment 3

[0047] A preparation method of an iodide ion-doped modified Fe-MOF bulk electrode material, the specific steps are as follows:

[0048] (1) Weigh 1 mmol of ferric nitrate and dissolve it in 10 mL of deionized water to generate solution A, weigh 1 mmol of potassium ferrocyanide and dissolve it in 10 mL of deionized water to generate solution B, and add 0.5 g of polyvinylpyrrolidone to solution B PVP template agent, 1 mL of sulfuric acid, 0.1 g of trisodium citrate, wherein the relative molecular mass of the polyvinylpyrrolidone PVP template agent is 1,300,000. The A and B solutions were stirred at room temperature for 5 minutes and then added to the hydrothermal tank for hydrothermal reaction, wherein the molar ratio of the iron salt in the A solution to the potassium ferrocyanide in the B solution was 0.75:2; the hydrothermal reaction temperature was 120 ° C, and the reaction The time was 12h; the products obtained from the reaction were collected and centrifuged for 5 times w...

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Abstract

The invention discloses a preparation method and application of an iodide ion-doped modified Fe-MOF bulk electrode material. A co-precipitation method is adopted to dissolve iron salt and potassium ferrocyanide respectively, and mix them at normal temperature to prepare Fe-based MOF. , and then plasma treated for 5-20 min, the treated material was heat-treated in potassium iodide solution for 12-48 h, and then dried and centrifuged to obtain MOF electrode material. The beneficial effects of the invention are as follows: the preparation method of the invention is simple, the cost is low, the batch production is easy, and the preparation method is energy-saving and environmentally friendly. The obtained modified MOF materials are applied in iodide ion supercapacitors at 1 A g ‑1 Over 400 F g at current density ‑1 The specific capacitance, but also has a fast reaction rate, with a high energy density. The Coulombic efficiency of nearly 98% is maintained for 5000 cycles. It is expected to have a wide range of application values ​​in the electrode materials of supercapacitors and other energy storage devices.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework materials, and in particular relates to a preparation method and application of a Fe-MOF bulk electrode material modified by doping with iodide ions. Background technique [0002] With the diversification of the energy structure in modern society and the limitation of traditional fossil fuels and the greenhouse effect and environmental protection problems they bring, clean new energy has become a research hotspot. Energy storage of clean energy sources such as wind, solar and tidal energy is important for sustainable energy use and consumption. In this regard, electrochemical supercapacitors have emerged as one of the most promising candidates, especially for large-scale energy storage infrastructure, where electrochemical supercapacitors have the advantages of fast charge-discharge capability, high safety, and long lifetime. Electrochemical supercapacitors use electrode materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/86C08G83/00
CPCH01G11/30H01G11/86C08G83/008Y02E60/13
Inventor 谢二庆高文政程思拓傅杰财冒立海吴正昆
Owner LANZHOU UNIVERSITY
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