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Nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as preparation method thereof

A nitrogen-doped carbon and nitrogen-doped technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, electrolysis processes, etc., can solve the problems of affecting the catalytic activity of electrolyzed water, limited active metal content, and poor conductivity, etc., to achieve It is conducive to rapid transfer, simple and easy preparation process, and the effect of increasing the content of active nickel metal

Active Publication Date: 2018-06-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the carbon-coated metal composite carbon materials directly synthesized by the DC arc discharge method, the content of active metals is limited, and the material contains more amorphous carbon with relatively poor conductivity, which affects the overall catalytic activity of the material for electrolysis of water.

Method used

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  • Nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as preparation method thereof
  • Nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as preparation method thereof
  • Nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Preparation of carbon-containing nickel-coated single-walled carbon nanotube composites by DC arc discharge method:

[0038] Mix graphite powder (purity 99%), catalyst yttrium-nickel alloy powder and accelerator ferrous sulfide powder in a certain proportion, and press it into a rod with a diameter of 6mm, and then fix one end of it in the sealed DC arc discharge chamber. The anode is used as an anode graphite rod; wherein, the nickel element is 4.0 at% relative to the total atomic percentage of graphite, and the sulfur element is 1 at% relative to the total atomic percentage of graphite. Fix one end of another pure graphite rod with a diameter of 8mm to the cathode of the DC arc discharge chamber, keeping the two ends of the two graphite rods facing each other horizontally. The DC arc discharge chamber was evacuated and filled with high-purity helium to keep the initial pressure of the helium atmosphere at 0.7 bar. Then adjust the DC discharge current at 80A to sta...

Embodiment 2

[0051] The difference between Example 2 and Example 1 is that the product of step 1) of Example 1 is directly processed in step 3) without being processed in step 2), to obtain a nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst.

[0052] Image 6 Transmission electron micrograph of the nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst prepared for Example 2.

Embodiment 3

[0054] Embodiment 3 differs from Embodiment 1 in that:

[0055] Step 1) The catalyst in the anode graphite rod is changed to nickel powder, the accelerator is changed to nickel sulfide powder, the atomic percentage of nickel element relative to graphite is 2at%, the atomic percentage of sulfur element relative to graphite is 1at%, and the initial voltage of helium atmosphere is adjusted The discharge current is 1 bar, and the discharge current is maintained at 60A; the entire discharge process is about 10 minutes, and the discharge chamber also obtains a network-shaped black solid, wherein the content of nickel metal is about 9.5wt%.

[0056] Step 2) The product of step 1) was first stirred in 5wt% hydrogen peroxide at room temperature for 24 hours, and then burned in air in a tube furnace at 280°C for 12 hours. Then the product after burning is put into 2.6M nitric acid solution and stirred under reflux for 3h, after filtration, washing and drying, the product is obtained and...

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Abstract

The invention relates to a nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as a preparation method thereof. The nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst is prepared by the following steps: preparing a single-wall carbon nanotube composite material comprising carbon coated nickel by virtue of a DC arc discharging method, then removing amorphous carbon by virtue of oxidation and acid dissolving, further nitriding at a high temperature in an ammonia atmosphere, and obtaining a nitrogen-doped porous netted single-wall carbon nanotube composite material comprising the carbon coated nickel. The preparation method is low in raw material cost, simple and easy in operation and easy in mass production. The single-wall carbon nanotube composite material obtained in the DC arc discharging method has a porous netted structure, so that the precipitation of oxygen and hydrogen is facilitated, after the amorphous carbon is removed and the electron state on the surface of the carbon is optimized in a nitriding manner, the electrolysis water oxygen precipitation catalytic performance has better catalytic activity than the iridic oxide which is widely used in the industry, and the nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst has good catalytic hydrogen production activity when being used as an electrolytic water anode catalyst.

Description

technical field [0001] The invention belongs to the field of energy, in particular to a nitrogen-doped carbon-coated nickel composite nano-carbon electrolytic water catalyst and a preparation method thereof. Background technique [0002] Energy shortage is a challenge faced by the sustainable development of human society. The electrolysis of water to produce oxygen and hydrogen is an effective way to solve the problem of energy shortage. However, in the process of electrocatalytic water splitting, the kinetic process of electrocatalytic oxygen evolution reaction is much slower than that of hydrogen evolution reaction, which seriously hinders the improvement of water electrolysis efficiency. Therefore, the development of efficient oxygen evolution catalysts for water electrolysis is the key to improving the efficiency of water electrolysis. In addition, iridium dioxide, ruthenium dioxide, or platinum dioxide, which are commonly used in the industry for electrolysis of water...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33Y02E60/36
Inventor 官轮辉吴初新张建硕
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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