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Carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and preparation method of catalyst

A core-shell catalyst, copper-nickel alloy technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to avoid gradual corrosion and shedding, saving precious metals, alloying high degree of effect

Inactive Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of existing core-shell catalysts and preparation methods thereof, the present invention is proposed

Method used

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  • Carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and preparation method of catalyst
  • Carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and preparation method of catalyst
  • Carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 400 mg of oxidized carbon powder to 40 mL of ethanol and water (volume ratio 1:1) mixed solvent, then add 100 mg of nickel nitrate hexahydrate and 303 mg of copper nitrate trihydrate. Stir at 60°C until the water and ethanol volatilize to form a paddle, then transfer to a vacuum drying oven and dry at 70°C for 4 hours to obtain CuNi salt / C. CuNi salt / C is ground into powder, placed in a porcelain boat and placed in an atmosphere tube furnace. 2 -Ar (volume flow rate ratio 20:80) reduction heat treatment at 500 °C for 1 h in a reducing atmosphere, and then naturally cooled to room temperature to obtain CuNi 4: 1 / C powder, its corresponding XRD spectrum is as figure 2 As shown in the middle curve 2, it is related to Ni 0.19 Cu 0.81 The one-to-one correspondence of the diffraction peaks of the alloy indicates that a good alloying effect has been obtained between nickel and copper. Weigh the above CuNi 4: 1 Add 450 mg of / C powder to 200 mL ethylene glycol...

Embodiment 2

[0021] Add 1000 mg of oxidized carbon powder to 100 mL of ethanol and water (volume ratio 1:1) mixed solvent, then add 248 mg of nickel nitrate hexahydrate and 760 mg of copper nitrate trihydrate. Stir at 50°C until the water and ethanol volatilize to form a paddle, then transfer to a vacuum drying oven and dry at 70°C for 10 hours to obtain CuNi salt / C. CuNi salt / C is ground into powder, placed in a porcelain boat and placed in an atmosphere tube furnace. 2 -Ar (volume flow rate ratio 20:80) reduction heat treatment at 600 °C for 1 h in a reducing atmosphere, and then naturally cooled to room temperature, the obtained CuNi with good alloying 4: 1 / C powder, wherein the mass fraction of copper and nickel is about 20%. Weigh the above CuNi 4: 1 Add 1000 mg of / C powder into 500 mL of ethylene glycol solution dissolved with 200 mg of chloroplatinic acid hexahydrate and 25 mg of polyvinylpyrrolidone (PVP protective agent), stir and raise the temperature to 125 °C and the...

Embodiment 3

[0023] Add 400 mg of oxidized carbon powder to 30 mL of ethanol and water (volume ratio 1:1) mixed solvent, then add 100 mg of nickel nitrate hexahydrate and 303 mg of copper nitrate trihydrate. Stir at 50°C until the water and ethanol volatilize to form a paddle, then transfer to a vacuum drying oven and dry at 70°C for 10 hours to obtain CuNi salt / C. CuNi salt / C is ground into powder, placed in a porcelain boat and placed in an atmosphere tube furnace. 2 -Ar (volume flow rate ratio 20:80) reduction heat treatment at 600 °C for 1 h in a reducing atmosphere, and then naturally cooled to room temperature, the obtained CuNi with good alloying 4: 1 / C powder, wherein the mass fraction of copper and nickel is about 20%. Weigh the above CuNi 4: 1 Add 450 mg of / C powder to 200 mL ethylene glycol solution dissolved with 60 mg palladium chloride, 60 mg potassium chloride and 10 mg polyvinylpyrrolidone (PVP protective agent), stir and heat up to 130°C and then reflux 1h. . ...

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Abstract

The invention provides a carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and a preparation method of the catalyst, belonging to the field of fuel cells and energy-saving electrolysis. A conductive carbon material serves as a carrier, a base metal CuNi alloy with corrosion resistance and high alloying degree serves as a core, a precious metal (namely an alloy of one or two in M, Pt, Pd, Ru, Ir and Rh) serves as a shell layer, so that the carbon-loaded core-shell metal catalyst is prepared. The method comprises the following preparation steps: performing heat treatment on carbon dipped with copper and nickel salt at the temperature of 300-1000 DEG C under a reducing atmosphere, thereby obtaining CuNi / C; performing reflux reduction on CuNi / C in ethylene glycol containing the precious metal salt and PVP, thereby obtaining the CuNi@M / C core-shell catalyst. The alloying degree and corrosion resistance of the core CuNi are improved, the CuNi alloy surface is beneficial to precious metal selective deposition, and the precious metals in finite quantity are deposited on the CuNi core in a small layer number. According to the catalyst prepared by the method, the loading capacity of precious metals is reduced from 20 percent of the traditional catalyst to 5-10 percent, the electrocatalytic activity is not lowered, and the stability is high.

Description

technical field [0001] The invention relates to the fields of fuel cells and energy-saving electrolysis, in particular to a core-shell catalyst of a carbon-supported nano-copper-nickel alloy core-noble metal shell and a preparation method thereof. Background technique [0002] In the field of fuel cells or water electrolysis, noble metals Pt, Pd, and Ru are excellent electrocatalyst materials, but their application costs are high due to the scarcity of resources. How to further improve the electrocatalytic activity of noble metals and reduce the loading of noble metals has become an important problem to be solved in this field. It is well known in the art that the surface of catalyst nanoparticles is the place where the catalytic reaction occurs, and the support of the carrier with high specific surface area helps to reduce the size of metal nanoparticles, improve the activity of nanocatalysts and reduce the amount of noble metal catalysts. The core-shell nanocatalyst uses ...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/90
CPCY02E60/50
Inventor 万平玉唐阳陈咏梅钮因健王佳溪陈思喆门宝刘佳
Owner BEIJING UNIV OF CHEM TECH
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