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A kind of preparation method and application of oxygen evolution catalyst

A catalyst and oxygen evolution technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve high cost, widespread application obstacles, affect energy conversion efficiency, etc. problem, to achieve the effect of improving the catalytic activity of oxygen evolution, low cost, and easy to realize industrial production

Active Publication Date: 2021-08-03
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical water splitting is a practical and environmentally friendly method to generate clean fuels. Water splitting includes anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction, which have severe overpotential requirements and are greatly limited in practical applications, especially Inherent slow kinetics and multiple electron transfer steps in the OER process significantly affect energy conversion efficiency
So far, iridium oxide (IrO 2 ) or ruthenium oxide (RuO 2 ) are state-of-the-art OER catalysts, however, their wide application in practical industry is hindered due to their scarcity and high cost, therefore, the key issue of water splitting is mainly to study catalysts with high activity and low cost

Method used

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  • A kind of preparation method and application of oxygen evolution catalyst
  • A kind of preparation method and application of oxygen evolution catalyst
  • A kind of preparation method and application of oxygen evolution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) 100 mg OMC was added 5 ml of 2m nitrate water bath 60 ° C for 30 min, and centrifugally washed once, and the mesoporous carbon was obtained.

[0043] (2) Nickel nickel nitrate and hexahydrate of hexahydrate is weighed in a molar ratio of 1: 2, dissolved in 5 ml absolute ethanol.

[0044] (3) The OMC of step (1) was transferred to a solution of step (2) with 5 ml of ethanol, stirred for 10 min, then supera for 2 h, then stirred to dryness, resulting in powder. (Stir until the end, the sample will be a little tide, and can be dried after the step is completed).

[0045] (4) Place the powder of step (3) is placed in a tube furnace, and the argon atmosphere is 350 ° C. Calcination for 6 h.

[0046] Property characterization:

[0047] figure 1 The Nico obtained by Example 1 was shown 2 O 3 High resolution TEM image of @omc.

[0048] like figure 1 As shown, a nickel cobalt oxide is formed on the OMC, and the average particle diameter of the nickel cobalt oxide particles is 3-8...

Embodiment 2

[0051] Example 2 Nico 2 O 3 @OMC catalyst catalytic activity evaluation

[0052] With 1 M NaOH as the electrolyte solution, Ag / AgCl is the reference electrode, the platinum network is the counter electrode, the glass-carbon electrode is the working electrode, the sweep is 5mV / s, and linearly scanned volts (LSV) on the Autolab PGSTAT 302N electrochemical workstation. Test, such as image 3 Indicated. Nico prepared by Example 1 2 O 3 @Omc catalyst (0.567mg / cm 2 ) 10 mA / cm in alkaline electrolyte solution 2 The potential at the current density is 1.51V, and the corresponding over-potential is 280mV, which is superior to Nico. 2 O 3 + OMC (1200mV) and OMC (1300mV)

Embodiment 3

[0053] Example 3 Nico 2 O 3 @OMC catalyst in electrocatalytic stability appraisal under constant potential

[0054] like Figure 4 As shown in 1 M NaOH as the electrolyte solution, Ag / AgCl is the reference electrode, the platinum network is a counter electrode, and the glass-carbon electrode is a working electrode, and the electrochemical stability is measured at a constant potential. After 20000s, the current drops. 25.7%, indicating Nico prepared in Example 1 2 O 3 The @omc catalyst has good stability.

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Abstract

The present application relates to an oxygen evolution catalyst and its preparation method and application. The oxygen evolution catalyst is composed of nickel-cobalt metal oxide and mesoporous carbon, wherein the nickel-cobalt metal oxide is formed on the mesoporous carbon; the oxygen evolution The catalyst has good thermal stability and oxygen evolution catalytic activity.

Description

Technical field [0001] The present application relates to the field of electrocatalytic water, and is specifically related to an epoxy catalyst and a preparation method thereof. Background technique [0002] Global warming and climate change issues are widely concerned that researchers are committed to the low cost, environmentally friendly, relatively non-toxic electrocatalysts. Electrochemical water decomposition is a practical and environmentally friendly method of cleaning fuel. Water decomposition includes anodic oxygen reactions (Oer) and cathode hydrogenation response, which has a serious over-potential requirement, which is limited in practical applications, especially Suitable slow power and multi-electronic transfer steps in the OER process significantly affects energy conversion efficiency. So far, oxide (IRO) 2 ) Or ruthenium oxide (Ruo 2 ) Is the most advanced Oer catalyst, but due to their scarcity and higher cost, it has been hindered by wide application in the act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/10C25B1/04H01M4/90
CPCH01M4/9033H01M4/9083C25B1/04B01J23/002B01J23/755C25B11/091B01J35/33B01J35/61Y02E60/50Y02E60/36
Inventor 刘爱骅张艳王秀秀
Owner QINGDAO UNIV
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