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Porous-carbon loaded metal composite material and preparing method and application thereof

A composite material and metal-loaded technology, applied in the field of nanomaterials, can solve problems such as poor activity and stability, and achieve the effects of low cost, excellent performance, and easy large-scale production.

Active Publication Date: 2016-06-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, most catalysts for oxygen generation, such as metal oxides, have higher activity in alkaline electrolytes, but relatively poor activity and stability in acidic electrolytes.

Method used

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  • Porous-carbon loaded metal composite material and preparing method and application thereof
  • Porous-carbon loaded metal composite material and preparing method and application thereof
  • Porous-carbon loaded metal composite material and preparing method and application thereof

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preparation example Construction

[0043] Correspondingly, an embodiment of the present invention provides a method for preparing a porous carbon-supported metal composite material, comprising the following steps:

[0044] NiMoO 4 Nanorods and carbon source monomers were reacted in Tris reagent solution to obtain NiMoO 4 / carbon source precursor;

[0045] The NiMoO 4 / The carbon source precursor is calcined to obtain a porous carbon-supported metal composite material;

[0046] The composite material includes: a porous carbon support; and nickel and molybdenum carbide supported on the porous carbon support.

[0047] The preparation method provided by the invention can prepare porous carbon-loaded nickel and molybdenum carbide composite material, which has high catalytic activity for hydrogen production; and the invention can simplify the process flow, reduce the cost, and is suitable for large-scale industrial promotion.

[0048] The embodiment of the present invention provides NiMoO 4 nanorods, the NiMoO ...

Embodiment 1

[0068] (1)NiMoO 4 Preparation of nanorod material: 2mmolNi(NO 3 ) 2 ·6H 2 O and 2 mmol Na 2 MoO 4 2H 2 O was respectively dissolved in 17.5mL deionized water, stirred and fully dissolved, and the above Na 2 MoO 4 solution was added to Ni(NO 3 ) 2 solution, stirred for 10 minutes to form a uniform mixed solution; transferred the mixed solution to a 50mL reaction kettle, put it in a 150°C oven, and reacted for 6h; took out the reaction kettle to obtain a large amount of yellow precipitate, and centrifuged the obtained reaction mixture. Then wash twice with distilled water and once with ethanol, and dry in a vacuum oven at 60°C for 12 hours.

[0069] (2) Prepare a 2 mg / mL Tris reagent solution, and then use 1 mol / L dilute hydrochloric acid to adjust the pH of the Tris reagent solution to make the pH of the solution 8.5. Take by weighing a certain amount of NiMoO prepared in step (1) 4Nanorods, dispersed into the above Tris reagent solution, NiMoO 4 The mass concentrat...

Embodiment 2

[0074] Example 1 was repeated, with the following difference: when stirring vigorously, the mass concentration of dopamine was 0.2 mg / mL, and a porous carbon-supported metal composite material was finally prepared.

[0075] The composite material that obtains is carried out electron microscope analysis, the result sees Figure 4 . Figure 4 It is the transmission electron micrograph of embodiment 2 gained porous carbon loaded nickel and molybdenum carbide composite material, from Figure 4 It can be seen that, with the transmission electron micrograph of the composite material prepared in embodiment 1 (see figure 2 ) in comparison, its dopamine concentration is lower, and the diameter of nanorods is smaller, ranging from 50 to 75 nm.

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Abstract

The invention provides a porous-carbon loaded metal composite material and a preparing method and application thereof. The method includes the steps that NiMoO4 nanometer rods and carbon-source monomers are reacted in Tris reagent solutions to obtain NiMoO4 / carbon source precursors; the NioMO4 / carbon source precursors are calcined to obtain the porous-carbon loaded metal composite material. The porous-carbon loaded metal composite material comprises porous-carbon carriers, nickel and molybdenum carbide, wherein the nickel and the molybdenum carbide are loaded to the porous-carbon carriers. The method is simple in step and easy to operate, and has the advantages of being convenient, rapid and the like. The porous-carbon loaded nickel and molybdenum carbide composite material has the excellent catalyzing electrochemistry hydrogen-producing and oxygen-producing performance and the excellent full water decomposition performance. An experiment shows that when the composite material serves as a catalyst in a hydrogen producing reaction, and when the overpotential is 0.25 V, the electric current density can be 52 mA / cm<2>; in a full hydrolysis reaction, when the electric potential is 1.68 V, the electric current density can be 10 mA / cm<2>, the performance is excellent, and the porous-carbon loaded metal composite material has the good application prospect in the field of electro-catalysis hydrogen producing and oxygen producing and the field of full water decomposition.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a porous carbon-supported metal composite material and its preparation method and application. Background technique [0002] With the rapid depletion of fossil energy sources, the development of new energy sources has become a topic of concern, among which water splitting to produce hydrogen is considered an effective method. Water splitting includes the cathodic hydrogen production reaction and the anode oxygen production reaction. Scientists hope to develop cheap and efficient catalysts to reduce the overpotential of the cathodic and anodic reactions respectively, thereby reducing the economic cost by reducing the applied voltage. [0003] Among the catalysts used for water splitting and hydrogen production, platinum-based catalysts have good catalytic activity for hydrogen production, and ruthenium-based catalysts have good catalytic activity for oxygen production....

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/02C25B11/06C25B1/04
CPCC25B1/04C25B11/04B01J27/22B01J35/40Y02E60/36
Inventor 俞书宏余自友段玉
Owner UNIV OF SCI & TECH OF CHINA
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