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A kind of preparation method of iron-doped bismuth tungstate

A bismuth tungstate and iron doping technology, applied in the field of materials, can solve problems such as poor electrical conductivity, achieve the effects of reducing diffusion distance, reducing internal resistance, and easy control

Active Publication Date: 2020-07-14
上海九明谷医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bismuth tungstate has multiple reaction centers Bi +3 and WO 6 +6 , the theoretical capacity is high, the specific surface area of ​​the bismuth tungstate flake is large and can fully contact with the electrolyte, but its conductivity is poor

Method used

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  • A kind of preparation method of iron-doped bismuth tungstate
  • A kind of preparation method of iron-doped bismuth tungstate
  • A kind of preparation method of iron-doped bismuth tungstate

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preparation example Construction

[0027] see figure 1 , shows a flow chart of the steps of a method for preparing an iron-doped bismuth tungstate material according to an embodiment of the present invention, which includes the following steps:

[0028] S10, weigh bismuth nitrate pentahydrate and citric acid with a molar ratio of 1:1 and dissolve them in 10 mL of distilled water to form a metal-citrate complex. After vigorously stirring for 10 minutes, a mixed solution was obtained, and the volume of the mixed solution was used for calculation;

[0029] S20, weigh sodium tungstate dihydrate and sodium bicarbonate with a molar ratio of 1:4 and dissolve in 10mL of A solution. After further stirring for 5 minutes, the solvothermal reaction was followed by cooling to room temperature; the reactant was taken out and washed by centrifugation with alcohol and distilled water three times each, and dried at 70°C for 12 hours to obtain a flower-shaped bismuth tungstate material.

[0030] Bi in the above reaction +3 Fo...

Embodiment 1

[0037] S10, add 0.25mmol Bi(NO 3 ) 3 ·5H 2 O was added to 10 mL of aqueous solution containing 0.25 mmol of citric acid to form a metal-citrate complex. After vigorous stirring for 10 minutes, solution A was obtained.

[0038] S20, add 0.125mmol Na 2 WO 4 2H 2 O and 0.5 mmol NaHCO 3 added to the above solution. After further stirring for 5 minutes, the solution was poured into a Teflon-lined stainless steel autoclave with a capacity of 20 mL, and kept at 180°C for 15 hours and then cooled to room temperature; the reactant was taken out and washed by centrifugation with alcohol and distilled water three times each , and dried at 70°C for 12 hours to obtain a flower-like bismuth tungstate material.

[0039] pass figure 2 Observe that the 2um-5um flower-shaped bismuth tungstate prepared in the above steps is relatively smooth and well stacked into a flower-like structure, so that the surface area is relatively large, which is convenient for the next step.

[0040] S30,...

Embodiment 2

[0044] S10, add 0.25mmol Bi(NO 3 ) 3 ·5H 2 O was added to 10 mL of aqueous solution containing 0.25 mmol of citric acid to form a metal-citrate complex. After vigorous stirring for 10 minutes, solution A was obtained.

[0045] S20, add 0.125mmol Na 2 WO 4 2H 2 O and 0.5 mmol NaHCO 3 added to the above solution. After further stirring for 5 minutes, the solution was poured into a Teflon-lined stainless steel autoclave with a capacity of 20 mL, and kept at 180°C for 12 hours and then cooled to room temperature; the reactant was taken out and washed by centrifugation with alcohol and distilled water three times each , and dried at 70°C for 12 hours to obtain a flower-like bismuth tungstate material.

[0046] S30, measure the DMF and distilled water that volume ratio is 8:2, mix as mixed solvent, both volumes and as mixed solvent volume are used for calculation;

[0047] S40, the obtained 0.125mmol flower-like bismuth tungstate material and 0.07mmol

[0048] FeCl 2 4H ...

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Abstract

The invention discloses a preparation method for iron-doped bismuth tungstate. The method comprises the following steps: bismuth nitrate pentahydrate is added to a citric acid-containing aqueous solution to form a metal-citrate complex; after 10 minutes of vigorous stirring, sodium tungstate dehydrate and sodium bicarbonate are added to the above solution; after further stirring for 5 minutes, thefilling degree in a reactor is 50%, the heat is preserved for 15 h under the temperature of 180 DEG C, and cooling to room temperature is carried out; the taken reactant is centrifugally cleaned withalcohol and distilled water three times each, and a flower-like bismuth tungstate material is obtained; DMF and distilled water with a volume ratio of 8 to 2 are measured and mixed as a mixed solvent; the above bismuth tungstate and ferrous chloride tetrahydrate are added to the mixed solvent; after further stirring for 5 minutes, the filling degree in the reactor is 50%, the heat is preserved for 2 h under the temperature of 100 DEG C, and cooling to room temperature is carried out; the taken reactant is centrifugally cleaned with alcohol and distilled water three times each, and an iron-doped bismuth tungstate material is obtained.

Description

technical field [0001] The invention belongs to the technical field of materials, and designs a preparation method of an iron-doped bismuth tungstate material. The production and preparation of the material has use value in the fields of energy storage application, energy saving and environmental protection. Background technique [0002] Supercapacitors or ultracapacitors have recently gained increasing interest due to their high power density (1-10 kW / kg) compared to conventional battery systems (150 W / kg). These charges are stored at the electrode / electrolyte interface and outer surface rather than the electrode volume, which facilitates fast charge / discharge rates, which is the main reason for the high power density of supercapacitors. In addition, the service life is expected to be around 100,000 times, and the supercapacitor has a long shelf life, high efficiency, environmental protection and safe use. Major applications for such supercapacitors include hybrid electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/46
CPCH01G11/24H01G11/46Y02E60/13
Inventor 樊启玲徐军明
Owner 上海九明谷医疗科技有限公司
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