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a cofe 2 o 4 Preparation method and application of nanosheet oxygen evolution catalyst

A nanosheet and catalyst technology, applied in the field of energy material electrocatalysis, achieves the effects of simple equipment, low source cost and high activity

Active Publication Date: 2021-03-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an efficient and low-cost electrocatalyst that can effectively reduce the overpotential of the OER reaction can be developed, it will greatly reduce the cost of water electrolysis to produce hydrogen and oxygen, and the performance may also be improved.

Method used

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  • a cofe <sub>2</sub> o <sub>4</sub> Preparation method and application of nanosheet oxygen evolution catalyst
  • a cofe <sub>2</sub> o <sub>4</sub> Preparation method and application of nanosheet oxygen evolution catalyst
  • a cofe <sub>2</sub> o <sub>4</sub> Preparation method and application of nanosheet oxygen evolution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Add potassium cobalt cyanide, ferric nitrate and cobalt oxalate into water at a molar ratio of 1:2:1 to form an aqueous solution. The amount of water added is just enough to dissolve the three raw materials. Stir at room temperature for 4.5 hours, then statically Place the precipitate for 4 hours, and wash the obtained complex precipitate with water and ethanol three times in sequence to obtain an iron-cobalt-based precursor.

[0038] Add 6M NaBH dropwise to the above iron-cobalt-based precursor 4 Aqueous solution until bubbles are no longer generated, the dropping rate is 20 drops / min, the resulting black liquid is left to stand, centrifuged to obtain a black solid, and the black solid is washed three times with water and ethanol respectively to obtain CoFe 2 o 4 Nanosheet Oxygen Evolution Catalyst.

[0039] figure 1 for CoFe 2 o 4 The SEM photo of the nanosheet oxygen evolution catalyst shows that the catalyst is a sheet structure with an average particle size of ...

Embodiment 2

[0046] Add potassium ferricyanide, ferric oxalate and cobalt nitrate into water according to the molar ratio of 1:3:1 to form an aqueous solution. The amount of water added is just enough to dissolve the three raw materials. Stir at room temperature for 4.5 hours, then statically Place the precipitate for 4 hours, and wash the obtained complex precipitate with water and ethanol three times in sequence to obtain an iron-cobalt-based precursor.

[0047] Add 6M NaBH dropwise to the above iron-cobalt-based precursor 4 Aqueous solution until bubbles are no longer generated, the dropping rate is 21 drops / min, the obtained black liquid is left standing, centrifuged to obtain a black solid, and the black solid is washed three times with water and ethanol respectively to obtain CoFe 2 o 4 Nanosheet Oxygen Evolution Catalyst.

Embodiment 3

[0049] Add potassium ferrocyanide, cobalt sulfate and ferric chloride into water according to the molar ratio of 2:2:1 to form an aqueous solution. The amount of water added is just enough to dissolve the three raw materials. Stir at room temperature for 4.5 hours. After standing for precipitation for 4 hours, the obtained complex precipitate was washed with water and ethanol three times in sequence to obtain an iron-cobalt-based precursor.

[0050] Add 6M NaBH dropwise to the above iron-cobalt-based precursor 4 Aqueous solution until bubbles are no longer generated, the dropping rate is 20 drops / min, the resulting black liquid is left to stand, centrifuged to obtain a black solid, and the black solid is washed three times with water and ethanol respectively to obtain CoFe 2 o 4 Nanosheet Oxygen Evolution Catalyst.

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Abstract

The invention discloses a CoFe 2 o 4 The invention relates to a preparation method and application of a nanosheet oxygen evolution catalyst, belonging to the technical field of energy material electrocatalysis. Its preparation method comprises the following steps: (1) preparation of iron-cobalt-based precursor; (2) CoFe 2 o 4 Preparation of nanosheet oxygen evolution catalysts. The preparation method disclosed by the invention has low raw material source cost, simple and controllable method, easy operation, simple equipment and less pollution; the prepared high-performance high-oxygen vacancy CoFe 2 o 4 The nanosheet oxygen evolution catalyst has many oxygen vacancies, many active sites, and high electrocatalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis of energy materials, in particular to a CoFe 2 o 4 Preparation method and application of nanosheet oxygen evolution catalyst. Background technique [0002] With the depletion of fossil energy and the serious pollution caused to the environment during its use, we are required to develop clean, efficient and renewable energy as soon as possible. Since the 1970s, H 2 Considered as an ideal energy carrier, it has the highest gravimetric energy density among known fuels and is free of CO in the energy conversion process 2 Therefore, it is currently attracting increasing attention. h 2 Energy from renewable sources can be stored in the form of chemical bonds, which can then be converted back into electricity by fuel cells or other devices for supply to end users. H on Earth 2 It does not exist in free form, but mainly exists in compounds such as hydrocarbons and water. H 2 The most use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C25B11/077C25B11/054C25B1/04
CPCB01J23/002B01J23/75B01J35/0013B01J35/0033C25B1/04C25B11/077Y02E60/36
Inventor 黄太仲郭中芹房恒义梁栋孙振国孙玥袁俊
Owner UNIV OF JINAN
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