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

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Problems solved by technology

Such traditional single-metal oxide oxygen evol

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

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Experimental program
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Example Embodiment

[0039] Example 1

[0040] preparation:

[0041] (1) Mixing of the precursor solution: First, weigh 0.7mmol nickel sulfate and 0.3mmol cobalt sulfate and dissolve in 30mL water / ethanol (v / v=20:10) mixed solvent, stir for 10min, add 2mL oleylamine, 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℃, and hydrothermally react for 15 hours to obtain hydroxide, and centrifuge Wash 3 to 5 times and vacuum dry for 8 hours.

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

[0044] Half-cell test: The half-cell system uses 1M KOH solution as electrolyte, Ni 7 Co 3 O x Electrocatalyst performs LSV scanning, such as image 3 Shown. Ni prepared by this method 7 Co 3 10mA / cm in 1M KOH electrolyte solution 2 The potential at the electrolysis current density is 1.634V (vs. ...

Example Embodiment

[0045] Example 2

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

Example Embodiment

[0047] Example 3

[0048] The hexagonal nickel-cobalt oxide nanosheets were prepared by the process described in Example 2, and used as the oxygen evolution electrocatalyst of the alkaline solid electrolyte water electrolysis cell. During the experiment, it was found that the nickel and 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 When the cathode uses 40wt.% PtC as the hydrogen evolution catalyst, the electrolytic cell is subjected to the polarization curve test at 50°C. The steady-state polarization curve of the full battery measured under the same test conditions as in Example 2 is as follows Figure 5 Shown. 50°C, 100mA / cm 2 The stability test data of the electrolytic cell measured under the conditions such as Image 6 Shown.

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PUM

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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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