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Preparation method of ultrathin CoNi alloy nanosheet

A nano and ultra-thin alloy technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of complex preparation methods, achieve simple operation, huge potential for use, and good electrocatalytic activity for oxygen evolution.

Active Publication Date: 2017-11-28
SHAANXI NORMAL UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Cobalt-nickel alloy is a typical magnetic alloy. Cobalt-nickel alloy material has good corrosion resistance and thermal stability. Compared with simple cobalt and nickel, cobalt-nickel alloy shows better performance in many cases. Magnetic materials, fuel cells, electronic and optoelectronic devices, bioengineering materials and other fields have broad application prospects, but at present, cobalt-nickel alloys are mainly prepared by adding surfactants or microwave methods to obtain different shapes, and the preparation methods are relatively complicated.

Method used

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  • Preparation method of ultrathin CoNi alloy nanosheet

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 0.5mL of 2.0mol / L cobalt chloride aqueous solution and 0.5mL of 1.0mol / L potassium tetracyannickelate aqueous solution into a 5mL beaker, mix well, and stand at 40°C for 8 hours to obtain cobalt-nickel cyanide gel, and then Add 50 mL of 3.0 mol / L sodium borohydride aqueous solution under stirring conditions, wherein the molar ratio of potassium tetracyanonickelate to cobalt chloride and sodium borohydride is 1:2:300, reduce the reaction at 70°C for 6 hours, and cool to normal temperature, centrifuged, washed with deionized water, and dried at 60°C in a vacuum oven to obtain ultrathin CoNi alloy nanosheets (see Figure 1~4 ).

Embodiment 2

[0024] Add 0.5mL of 1.5mol / L cobalt chloride aqueous solution and 0.5mL of 1.0mol / L potassium tetracyannickelate aqueous solution into a 5mL beaker, mix well, and stand at 40°C for 8 hours to obtain cobalt-nickel cyanide gel, and then Add 36 mL of 3.5 mol / L sodium borohydride aqueous solution under stirring conditions, wherein the molar ratio of potassium tetracyanonickelate to cobalt chloride and sodium borohydride is 1:1.5:250, reduce the reaction at 70°C for 6 hours, and cool to At room temperature, centrifuged, washed with deionized water, and dried in a vacuum oven at 60°C to obtain ultrathin CoNi alloy nanosheets (see Figure 5 ).

Embodiment 3

[0026] Add 1mL of 2.0mol / L cobalt chloride aqueous solution and 1mL of 1.0mol / L potassium tetracyannickelate aqueous solution into a 5mL beaker, mix well, and let stand at room temperature for 12 hours to obtain cobalt nickel cyanide gel, and then Add 100mL of 3.0mol / L sodium borohydride aqueous solution, wherein the molar ratio of potassium tetracyanonickelate to cobalt chloride and sodium borohydride is 1:2:300, reduce reaction at room temperature for 24 hours, centrifuge, use Washed with ionized water and dried at 60°C in a vacuum oven to obtain ultra-thin CoNi alloy nanosheets (see Image 6 ).

[0027] The inventor uses the ultra-thin CoNi alloy nanosheets obtained in Example 1 to electrocatalyze oxygen evolution. The specific method is: add 2 mg of ultra-thin CoNi alloy nanosheets to 1 mL of aqueous solution, mix well, take 4 μL of the resulting mixed solution and drop it on the platinum carbon electrode above, to be used for electrochemical test after drying, test resul...

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Abstract

The invention discloses a preparation method of an ultrathin CoNi alloy nanosheet. The method comprises the following steps: a cobalt-nickel-cyanogen glue is prepared by taking cobalt chloride and potassium tetracyanonicolate as precursors, then sodium borohydride is used as a reducing agent, and the cobalt-nickel-cyanogen glue can be reduced into the ultrathin CoNi alloy nanosheet with a regular shape and an uniform size by adopting a method of heating in an aqueous solution. The method has the advantages of being simple and economic, and is suitable for industrial large-scale production, the obtained ultrathin CoNi alloy nanosheet has good stability and water solubility, and has good OER catalytic activity and stability in an alkaline potassium hydroxide solution, so that the method has a good application prospect in the aspect of electrochemistry.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing ultrathin CoNi alloy nanosheets. As a catalyst, the CoNi alloy nanosheets exhibit high catalytic activity and stability for oxygen evolution reaction under alkaline conditions. Background technique [0002] In recent years, due to the scarcity and high price of precious metal resources, more and more people have begun to study non-precious metal substances, especially non-precious metal alloys. Magnetic metals (such as cobalt, nickel) and their alloys have attracted much attention because of their high strength, corrosion resistance, high hardness, strong magnetism, and high catalytic performance. The study found that the catalytic performance of the special morphology structure is far superior to that of ordinary spherical particles. Cobalt-nickel alloy is a typical magnetic alloy. Cobalt-nickel alloy material has good corrosion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0551B22F1/054
Inventor 陈煜李颖李淑妮
Owner SHAANXI NORMAL UNIV
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