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A kind of cobalt-iron oxide hollow nanocage material, its preparation method and application

A technology of cobalt-iron oxide and nano-cage, which is applied in the field of electrocatalytic materials, can solve the problems of high price, poor activity and stability, etc., and achieve the effect of convenient operation, simple equipment, and green reaction solvent

Active Publication Date: 2021-07-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of high price, poor activity and stability of existing oxygen evolution electrode materials, the present invention provides a cobalt iron oxide hollow nanocage material and a preparation method thereof. The obtained composite material is used for an oxygen evolution electrode, and its electrolysis Oxygen performance has been significantly improved

Method used

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  • A kind of cobalt-iron oxide hollow nanocage material, its preparation method and application
  • A kind of cobalt-iron oxide hollow nanocage material, its preparation method and application
  • A kind of cobalt-iron oxide hollow nanocage material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 1.45g of cobalt nitrate hexahydrate and 3.24g of dimethylimidazole and dissolve them in 100mL of methanol, pour the former into the latter under vigorous stirring, stop stirring after 10min, and let stand at room temperature for 24h , after centrifugation, washed twice with methanol and once with ethanol to obtain ZIF-67. The obtained ZIF-67 was dispersed in 100 mL of ethanol to form a dispersion liquid.

[0033] (2) Weigh 61.5mg of ferrous acetate tetrahydrate (the molar weight of ferrous acetate tetrahydrate is 0.25mmol) and 56.1mg of hexamethylenetetramine, dissolve them in 8mL of ultrapure water, and add them to 20mL under stirring. (1) The obtained ZIF-67 dispersion liquid was heated to reflux for 30 minutes, then centrifuged, washed twice with ethanol, and dried overnight at 60° C. to obtain a solid.

[0034] (3) Grind the dry solid obtained in step (2) into powder and evenly spread it on the bottom of the silica ark and put it into the middle of the tu...

Embodiment 2

[0038] (1) The preparation of the ZIF-67 dispersion is the same as in Example 1.

[0039] (2) Weigh 24.6 mg of ferrous acetate tetrahydrate (the molar weight of ferrous acetate tetrahydrate is 0.1 mmol) and 22.4 mg of hexamethylenetetramine and dissolve them in 8 mL of ultrapure water, and add 20 mL of ZIF- 67 ethanol solution, heated to reflux for 30 min, then centrifuged, washed twice with ethanol, and dried overnight at 60°C.

[0040] (3) Grind the dry product obtained in step (2) into powder and evenly spread it on the bottom of the silica ark and put it into the middle of the tube-type atmosphere furnace. 2 / Ar (V / V=1 / 9) mixed atmosphere at 5°C min -1 After heating up to 320° C., calcining for 2 hours to obtain the cobalt-iron oxide hollow nanocage material.

[0041] The preparation of the working electrode and the test of its oxygen evolution catalytic performance are the same as in Example 1. The result is: when the current density is 10mA cm -2 , the reaction overpot...

Embodiment 3

[0043] (1) The preparation of the ZIF-67 dispersion is the same as in Example 1.

[0044] (2) Weigh 98.4 mg of ferrous acetate tetrahydrate (the molar weight of ferrous acetate tetrahydrate is 0.4 mmol) and 89.6 mg of hexamethylenetetramine and dissolve them in 8 mL of ultrapure water, and add 20 mL of ZIF- 67 ethanol solution, heated to reflux for 30 min, then centrifuged, washed twice with ethanol, and dried overnight at 60°C.

[0045] (3) Grind the dry product obtained in step (2) into powder and evenly spread it on the bottom of the silica ark and put it into the middle of the tube-type atmosphere furnace. 2 / Ar (V / V=1 / 9) mixed atmosphere at 5°C min -1 After heating up to 320° C., calcining for 2 hours to obtain the cobalt-iron oxide hollow nanocage material.

[0046] The preparation of the working electrode and the test of its oxygen evolution catalytic performance are the same as in Example 1. The result is: when the current density is 10mA cm -2 , the reaction overp...

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Abstract

The invention discloses a cobalt-iron oxide hollow nanocage material, which has an inner cavity and an outer shell. The invention also discloses a preparation method of the cobalt-iron oxide hollow nano-cage material and its application as an oxygen evolution electrode material. The performance of the cobalt-iron oxide hollow nanocage material of the present invention is superior to that of the commercial precious metal RuO 2 Material.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, and in particular relates to a cobalt-iron oxide hollow nano-cage material, a preparation method thereof and an application of an oxygen evolution electrode material. Background technique [0002] A series of problems such as the scarcity of fossil fuels, environmental pollution and global warming make the development of renewable clean energy an urgent problem to be solved. Hydrogen energy is environmentally friendly and has high energy density, which is one of the ideal alternative energy sources for traditional fossil energy. Electrocatalytic water splitting for hydrogen production can convert and store renewable energy such as solar energy and wind energy as chemical energy, and is the most attractive way to obtain hydrogen. However, the anodic oxygen evolution reaction of electrolyzed water involves four electrons transfer, the kinetics are slow, and an external voltage g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C25B1/04C25B11/091
CPCB01J23/75C25B1/04C25B11/04Y02E60/36
Inventor 王庆法任晓娜张香文邹吉军王涖
Owner TIANJIN UNIV
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