Method for preparing Fe-doped Mn3O4 carbon-nitrogen material with hollow nano-frame structure and application thereof

A frame structure, carbon-nitrogen material technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of time-consuming, cumbersome preparation process, and low output, and achieve difficult agglomeration, high oxygen reduction activity, and good morphology regular effect

Active Publication Date: 2019-08-20
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of such materials is usually time-consuming, cumbersome, and the output is low.

Method used

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  • Method for preparing Fe-doped Mn3O4 carbon-nitrogen material with hollow nano-frame structure and application thereof
  • Method for preparing Fe-doped Mn3O4 carbon-nitrogen material with hollow nano-frame structure and application thereof
  • Method for preparing Fe-doped Mn3O4 carbon-nitrogen material with hollow nano-frame structure and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A Fe-doped Mn with hollow nanoframe structure 3 o 4 The preparation method of carbon nitrogen material, comprises the following steps:

[0042] 1)KMnFe(CN) 6 Preparation of khaki precipitate: weigh 3.0g of PVP, 1.0mmol of K 3 Fe(CN) 6 ·3H 2 O solid metal salt and 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Fe(CN) 6 3- / PVP solution; Weigh 1.5mmol of MnCl 2 with 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Mn 2+ solution; the Fe(CN) 6 3- / PVP solution and Mn 2+ The solutions were mixed and allowed to stand for 12 hours to obtain KMnFe(CN) 6 Earthy yellow precipitate;

[0043] 2) Preparation of Fe-doped Mn with hollow nanoframe structure 3 o 4 Carbon nitrogen material: the KMnFe(CN) prepared in step 1) 6 The khaki precipitate was washed with alkali in 0.2 M NaOH solution at 40 ° C for 4 h, and the obtained solid powder material was first washed a...

Embodiment 2

[0046] A Fe-doped Mn with hollow nanoframe structure 3 o 4 The preparation method of carbon nitrogen material, comprises the following steps:

[0047] 1)KMnFe(CN) 6 Preparation of khaki precipitate: weigh 3.5g of PVP, 1.0mmol of K 3 Fe(CN) 6 ·3H 2 O solid metal salt and 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Fe(CN) 6 3- / PVP solution; Weigh 1.5mmol of MnCl 2 with 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Mn 2+ solution; the Fe(CN) 6 3- / PVP solution and Mn 2+ The solutions were mixed and allowed to stand for 12 hours to obtain KMnFe(CN) 6 Earthy yellow precipitate;

[0048] 2) Preparation of Fe-doped Mn with hollow nanoframe structure 3 o 4 Carbon nitrogen material: the KMnFe(CN) prepared in step 1) 6 The khaki precipitate was washed with alkali in 0.2 M NaOH solution at 40 ° C for 4 h, and the obtained solid powder material was first washed a...

Embodiment 3

[0050] A Fe-doped Mn with hollow nanoframe structure 3 o 4 The preparation method of carbon nitrogen material, comprises the following steps:

[0051] 1)KMnFe(CN) 6 Preparation of khaki precipitate: weigh 4.0g of PVP, 1.0mmol of K 3 Fe(CN) 6 ·3H 2 O solid metal salt and 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Fe(CN) 6 3- / PVP solution; Weigh 1.5mmol of MnCl 2 with 50ml H 2 The O solution was mixed and mechanically stirred for 10 min at room temperature to obtain Mn 2+ solution; the Fe(CN) 6 3- / PVP solution and Mn 2+ The solutions were mixed and allowed to stand for 12 hours to obtain KMnFe(CN) 6 Earthy yellow precipitate;

[0052] 2) Preparation of Fe-doped Mn with hollow nanoframe structure 3 o 4 Carbon nitrogen material: the KMnFe(CN) prepared in step 1) 6 The khaki precipitate was washed with alkali in 0.2 M NaOH solution at 40 ° C for 4 h, and the obtained solid powder material was first washed a...

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Abstract

The invention discloses a method for preparing a Fe-doped Mn3O4 carbon-nitrogen material with a hollow nano-frame structure and the application of the material in an oxygen reduction reaction and a zinc-air battery. The method comprises the steps of (1) separately preparing a Fe(CN)6<3->/PVP solution and a Mn<2+> solution, (2) uniformly mixing the Fe(CN)6<3->/PVP solution and the Mn<2+> solution and standing to obtain KMnFe(CN)6 khaki Prussian blue similar precipitation, and (3) performing alkali washing on KMnFe(CN)6 solid powder in a NaOH solution and raising the temperature to perform thermal processing at 250 DEG C to 350 DEG C in an inert atmosphere to obtain the Fe-doped Mn3O4 carbon-nitrogen material with the hollow nano-frame structure. The preparation method of the invention has the advantages of low cost and simple and universal use, the obtained material has the open hollow nano-frame structure, the material can be used as an electrocatalytic material of oxygen reduction reaction, and the material has high activity and excellent stability energy and can be applied as a positive electrode material of the zinc-air battery.

Description

technical field [0001] The invention relates to a Fe-doped Mn with a hollow nano-frame structure 3 o 4 The preparation method of carbon-nitrogen material and the electrocatalytic application of the obtained material and oxygen reduction reaction belong to the technical field of zinc-air battery cathode catalyst. Background technique [0002] Electrochemically rechargeable zinc-air batteries have the characteristics of high energy density, safe aqueous electrolyte, and strong economy. They have broad application prospects in electric vehicles, portable power supplies, and large-scale energy storage. They are an important industry direction for the development of green and clean energy. . As a potential electrochemical energy storage device, zinc-air batteries have attracted extensive attention from researchers due to their low cost, abundant resources, environmental friendliness, and high energy density. Oxygen reduction reaction (ORR) plays an important role in a series o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9016H01M4/9025H01M4/9041H01M4/905H01M4/9083Y02E60/50
Inventor 徐林李同飞刘坤豪李鑫刘千玉李苏霖孙冬梅唐亚文
Owner NANJING NORMAL UNIVERSITY
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