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A two-dimensional nanosheet bacof 4 preparation method

A two-dimensional nano-sheet technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of limiting electrochemical performance, unfavorable diffusion and reaction, etc., to improve electrochemical performance and increase reaction rate , good scientific research potential and application value

Active Publication Date: 2021-07-23
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, BaMF prepared by low-temperature hydrothermal method 4 (M=Mg, Mn, Co, Ni, Zn) particles exhibit a micron-scale bulk structure, which is not conducive to the external ions such as OH - Therefore, the electrochemical redox reaction is mainly concentrated on the surface and at both ends of the ion channel, which limits the further improvement of the electrochemical performance to some extent.

Method used

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  • A two-dimensional nanosheet bacof <sub>4</sub> preparation method
  • A two-dimensional nanosheet bacof <sub>4</sub> preparation method
  • A two-dimensional nanosheet bacof <sub>4</sub> preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Measure 12ml of trifluoroacetic acid and 36ml of distilled water (the volume ratio of acid and water is 1:3) in a graduated cylinder, let the acid enter the water and stir slowly, and then weigh 0.6g of BaF 2 and 0.3484g CoF 2 (The ratio of Co source and Ba source is 1.05:1) Dissolve in diluted trifluoroacetic acid, stir magnetically at room temperature to fully dissolve cobalt source and barium source, then transfer to 100ml autoclave lining , put the sealed autoclave at 230 ° C for 24 h, and then cool it down to room temperature naturally. The precipitate was washed several times with deionized water and absolute ethanol, filtered, and dried in an oven at 60°C to obtain two-dimensional nanosheet BaCoF 4 particles.

[0023] The XRD pattern of the product is as figure 1 As shown in , all the diffraction peaks of the sample are consistent with the standard BaCoF 4 The diffraction peaks in the card (JCPDS21-0065) correspond very well, and there are no impurity peaks, ...

Embodiment 2

[0026] Measure 12ml of trifluoroacetic acid and 36ml of distilled water (the volume ratio of acid and water is 1:3) in a graduated cylinder, let the acid enter the water and stir slowly, and then weigh 0.6g of BaF 2 and 0.365g CoF 2 (The ratio of Co source and Ba source is 1.1:1) Dissolve in diluted trifluoroacetic acid, stir magnetically at room temperature to fully dissolve the cobalt source and barium source. Add 0.4g of sodium dodecylbenzenesulfonate (SDBS) to the mixed precursor solution under magnetic stirring, stir for 30min and then ultrasonicate for 10min to fully dissolve SDBS in the acidic precursor solution, then transfer to a 100ml autoclave In the lining, the sealed autoclave was placed at 230°C for 24 hours, and then cooled to room temperature naturally. The precipitate was washed several times with deionized water and absolute ethanol, filtered, and dried in an oven at 60°C to obtain two-dimensional nanosheet BaCoF 4 particles.

[0027] The XRD pattern of th...

Embodiment 3

[0029] Measure 12ml of trifluoroacetic acid and 36ml of distilled water (the volume ratio of acid and water is 1:3) in a graduated cylinder, let the acid enter the water and stir slowly, and then weigh 0.6g of BaF 2 and 0.3484g CoF 2 (The ratio of Co source and Ba source is 1.05:1) Dissolve in diluted trifluoroacetic acid, stir magnetically at room temperature to fully dissolve cobalt source and barium source. Add 0.8g of sodium dodecylbenzenesulfonate (SDBS) to the mixed precursor solution under magnetic stirring, stir for 30min and then ultrasonic for 10min to fully dissolve SDBS in the acidic precursor solution, then transfer to a 100ml autoclave In the lining, the sealed autoclave was placed at 230°C for 24 hours, and then cooled to room temperature naturally. The precipitate was washed several times with deionized water and absolute ethanol, filtered, and dried in an oven at 60°C to obtain two-dimensional nanosheet BaCoF 4 particles.

[0030] The XRD pattern of the pro...

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Abstract

The invention discloses a two-dimensional nanosheet layered BaCoF 4 method of preparation. The method utilizes barium fluoride and cobalt fluoride as barium source and cobalt source respectively, cobalt fluoride, barium fluoride and trifluoroacetic acid provide fluorine source, mix and stir, ultrasonic, so that the barium source and cobalt source are fully dissolved in distilled water A mixed precursor solution was formed in the over-treated trifluoroacetic acid, and then an appropriate amount of sodium dodecylbenzenesulfonate (SDBS) was added as a surfactant and additive, and BaCoF was hydrothermally synthesized under the condition of 200‑230 °C. 4 Two-dimensional nanosheets. BaCoF prepared by this method 4 It presents a two-dimensional nanosheet layered structure with an average thickness of 100nm. When used as an electrode material, the two-dimensional nanosheet layered structure provides more active sites on the one hand, allowing the variable-valent ion Co 2+ exposed; on the other hand, its lamellar structure is more conducive to the OH in the electrolyte ‑ The transfer of ions greatly improves the utilization rate of the Faraday reaction and further improves the electrochemical performance of the supercapacitor.

Description

technical field [0001] The invention belongs to the preparation of supercapacitor electrode materials in energy storage devices, in particular to a two-dimensional nanosheet BaCoF 4 method of preparation. Background technique [0002] Supercapacitor is a new type of high-efficiency and low-cost energy storage device. It has broad application prospects in the communication market, computer market, new energy vehicles, consumer electronics, military equipment and other fields, and has become a research hotspot for many scientists around the world. The electrode material is one of the key factors determining the electrochemical performance of supercapacitors. In 2017, BaMF 4 (M=Mg, Mn, Co, Ni, Zn) was first used in supercapacitors, due to the MF in its crystal structure 6 Form an octahedral structure and be separated by Ba atoms to form a layered structure. This layered structure and variable valence metal ions M enable the diffusion of electrolyte ions into the interlayer, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00H01G11/24H01G11/30
CPCC01G51/006C01P2002/72C01P2004/03C01P2004/20C01P2004/61C01P2006/40H01G11/24H01G11/30Y02E60/13
Inventor 胡万彪王静谢继阳熊飞李光辉
Owner YUNNAN UNIV