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Preparation method of nano hollow structure prussian blue and analogues thereof

A technology of hollow structure and Prussian blue, which is applied in the field of preparation of nano-hollow structure Prussian blue and its analogues, can solve problems such as damage to health, and achieve the effect of cheap raw materials, uniform appearance and high purity

Inactive Publication Date: 2018-06-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, hydrochloric acid will react with ferricyanide ions (Fe(CN) 6 3- ) reaction to generate the highly toxic substance hydrogen cyanide, which seriously damages people's health

Method used

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  • Preparation method of nano hollow structure prussian blue and analogues thereof
  • Preparation method of nano hollow structure prussian blue and analogues thereof
  • Preparation method of nano hollow structure prussian blue and analogues thereof

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preparation example Construction

[0034] The steps of the preparation method of the present invention are as follows:

[0035] Step 1: Dissolve the manganese salt evenly in the polymer aqueous solution, add an appropriate amount of potassium ferricyanide or sodium ferricyanide aqueous solution and stir at room temperature to form a manganese ferricyanide suspension; the polymer in the polymer aqueous solution in the present invention The substance can generate a certain force with manganese ions, and increase the viscosity of the solution, thereby inhibiting the generation rate of manganese ferricyanide, which is beneficial to the formation of cubic morphology.

[0036] The preferred molar ratio of manganese salt to potassium ferricyanide or sodium ferricyanide is controlled between 3:2-4:2. If there are too few manganese salts, excess potassium ferricyanide or sodium ferricyanide will react with the metal salt ions added subsequently to generate granular ferricyanides that are difficult to remove, which will ...

Embodiment 1

[0045] 1. Preparation of manganese ferricyanide template suspension

[0046] Dissolve 0.35g of polyvinylpyrrolidone in 10ml of absolute ethanol to form solution A; weigh 100mg of MnSO 4 ·H 2 O powder was uniformly dissolved in 10ml deionized water to form solution B. Slowly add solution B to solution A and continue stirring for 30 min, then add 10 ml of 0.03M potassium ferricyanide aqueous solution dropwise. After continuous stirring at room temperature for 12 hours, a suspension of manganese ferricyanide can be obtained.

[0047] 2. Preparation of nano hollow cobalt ferricyanide

[0048] 10ml 0.02M Co(NO 3 ) 2 The aqueous solution was added dropwise to the above suspension, stirred rapidly for 5 minutes, and then stood at room temperature for 10 hours to allow sufficient cation exchange reaction. Afterwards, centrifuge with deionized water at a rate of 6000r / min, and dry the obtained precipitate in an oven at 80°C for 18 hours to obtain a nano-hollow cobalt ferricyanide...

Embodiment 2

[0050] 1. Preparation of manganese ferricyanide template suspension

[0051] Dissolve 0.35g of polyvinylpyrrolidone in 10ml of absolute ethanol to form solution A; weigh 100mg of MnSO 4 ·H 2 O powder was uniformly dissolved in 10ml deionized water to form solution B. Slowly add solution B to solution A and continue stirring for 30 min, then add 10 ml of 0.03M potassium ferricyanide aqueous solution dropwise. After continuous stirring at room temperature for 15 hours, a suspension of manganese ferricyanide can be obtained.

[0052] 2. Preparation of nano hollow copper ferricyanide

[0053] 10ml of 0.02M Cu(NO 3 ) 2 The aqueous solution was added dropwise to the above suspension, stirred rapidly for 8 minutes and then left at room temperature for 8 hours to allow sufficient cation exchange reaction. Afterwards, centrifuge with deionized water at a rate of 6000 r / min, and dry the obtained precipitate in an oven at 80°C for 18 hours to obtain a hollow nano-copper ferricyanid...

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Abstract

The invention relates to a preparation method of nano hollow structure prussian blue and analogues thereof, in particular to a preparation method of nano hollow structure prussian blue and analogues thereof used for an electrochemical energy storage device. According to the method, the nano hollow structure of the prussian blue and the analogues thereof is prepared by adopting a cation exchange method through taking manganese hexacyanoferrate as a sacrificial template in a solution at room temperature. The preparation method is simple in technical operation, mild in reaction condition and cheap in used raw materials, and has universality for preparation of the nano hollow structure prussian blue and the analogues thereof; and obtained products have the characteristics of being uniform in shape, controllable in wall thickness and large in specific surface area. When the nano hollow structure prussian blue and the analogues thereof are used as electrode materials for the electrochemicalenergy storage device, reaction sites are greatly improved through a nanoscale shell and the hollow structure; meanwhile, improvement of ion transportation is facilitated; and an assembled device hasexcellent electrochemical properties.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage materials, and relates to a preparation method of nano hollow structure Prussian blue and its analogues Background technique [0002] Electrochemical energy storage devices, especially metal ion batteries and supercapacitors, have the advantages of large specific energy, high energy conversion efficiency, long cycle life, clean and pollution-free, and have extremely broad application prospects in the field of new energy in the future. With the continuous development of society, people put forward higher and higher requirements for chemical energy storage devices, and further improving the energy storage performance of devices has become the focus of research in recent years. [0003] Electrode materials are one of the key factors affecting the performance of electrochemical energy storage devices. Among them, Prussian blue and its analogues have attracted great attention due to their ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/86H01M4/485H01M4/525H01M4/505
CPCH01G11/26H01G11/30H01G11/86H01M4/485H01M4/505H01M4/525Y02E60/10
Inventor 王建淦张智勇魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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