Hexagonal nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof

A technology of cobalt oxide and catalyst, which is applied in the field of hexagonal nickel/cobalt oxide oxygen evolution catalyst and its preparation and application, can solve the problem of low activity and achieve high oxygen evolution catalytic activity and good oxygen evolution electrocatalytic performance , the effect of good thermal stability

Inactive Publication Date: 2017-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such traditional single-metal oxide oxygen evolution electrocatalysts usually have low activity

Method used

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  • Hexagonal nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof
  • Hexagonal nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof
  • Hexagonal nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] preparation:

[0041] (1) Mixing of precursor solution: First, weigh 0.7 mmol of nickel sulfate and 0.3 mmol of cobalt sulfate and dissolve them in a mixed solvent of 30 mL of water / ethanol (v / v=20:10), stir for 10 minutes, add 2 mL of oleylamine, and vigorously Stir for 20min.

[0042](2) Hydrothermal reaction: Transfer the mixed solution obtained in (1) to a 50mL hydrothermal kettle, set the reaction temperature in a blast drying oven to 180°C, and perform hydrothermal reaction for 15 hours to obtain hydroxide, centrifuge Wash 3 to 5 times and dry in vacuum for 8 hours.

[0043] (3) Roasting: the dried sample was moved to a tube furnace and heated at 400° C. for 2 hours to obtain nickel-cobalt oxide.

[0044] Half-cell test: The half-cell system uses 1M KOH solution as the electrolyte, Ni 7 co 3 o x Electrocatalysts perform LSV sweeps, such as image 3 shown. The Ni prepared by this method 7 co 3 10mA / cm in 1M KOH electrolyte solution 2 The potential at the ...

Embodiment 2

[0046] Take the same preparation process as in Example 1, change the reaction conditions to 160°C, and conduct a hydrothermal reaction for 12 hours. The half-cell test steps used are as described in Example 1, and the relevant test results are as follows Figure 4 shown. The Ni prepared by this method 7 co 3 (OH)x 10mA / cm in 1M KOH electrolyte solution 2 The potential at the electrolysis current density is 1.624V (vs.RHE).

Embodiment 3

[0048] The process as described in Example 2 was used to prepare hexagonal nickel-cobalt oxide nanosheets, and used it as an oxygen evolution electrocatalyst for an alkaline solid electrolyte water electrolysis cell. During the experiment, it was found that nickel-cobalt oxide nanosheets have good oxygen evolution catalytic activity and stability in alkaline solid electrolyte water electrolysis cells. When the mass ratio of catalyst to resin (AS-4) in the catalytic layer is 5:1 , the cathode uses 40wt.% PtC as the hydrogen evolution catalyst, and the electrolytic cell is tested for polarization curve at 50°C. The steady-state polarization curve of the full battery measured under the same test conditions as Example 2 is as follows: Figure 5 shown. 50℃, 100mA / cm 2 The electrolytic cell stability test data measured under the conditions are as follows: Figure 6 shown.

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Abstract

The invention relates to a hexagonal nickel / cobalt oxide oxygen evolution catalyst, and a preparation method and application thereof. Concretely, nickel salts and cobalt salts are used as precursors; oleylamine is used as a coordination agent; in a mixed solvent, a hydrothermal reaction is performed to prepare nickel / cobalt hydroxide nanometer sheets; through the steps of centrifugal washing, drying, roasting and the like, the hexagonal nickel / cobalt oxide nanometer sheets with the diameter being about 150 nm and the thickness being about 10nm are prepared. The nickel / cobalt oxide is applied to the oxygen separation reaction in the water electrolysis hydrogen preparation process under the catalytic basic condition. The prepared nickel / cobalt oxide has the advantages that the specific surface area is large; the appearance is controllable; the preparation process is simple; the conditions are mild; under the condition of external bias pressure exertion, the hexagonal nickel / cobalt oxide oxygen evolution catalyst can be used for water electrolysis cell water electrolysis hydrogen preparation. The prepared nickel / cobalt oxide has good performance when being used as an alkaline solid polymer electrolyte (AEM) water electrolysis cell. The hexagonal nickel / cobalt oxide oxygen evolution catalyst has wide utilization values in RFC (regenerative fuel cells), photoelectrocatalysis and electrolysis hydrogen gas generator devices.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt oxide oxygen evolution catalyst for an alkaline water electrolytic cell. The method is prepared through the steps of precursor mixing-hydrothermal reaction-centrifugal washing-vacuum drying-roasting and the like to obtain a diameter of about 150nm 1. A hexagonal nickel / cobalt hydroxide nanosheet with a thickness of about 10nm. The final product, as an oxygen evolution electrocatalyst used under alkaline conditions, can be applied to AEM water electrolysis, RFC or various electrolysis devices. Background technique [0002] Hydrogen is not only an efficient and clean energy source, but also an excellent energy storage medium for renewable and sustainable energy systems. In response to the increasingly serious problem of global warming, all countries have made strategic adjustments to their energy systems. Hydrogen production by reforming fossil fuels is currently the main means of obtaini...

Claims

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Application Information

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IPC IPC(8): B01J23/755C25B11/06C25B1/04
CPCY02E60/36
Inventor 俞红梅迟军付丽贾佳覃博文邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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