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Non-noble metal photocatalysis cocatalyst and preparation method thereof `

A co-catalyst and non-precious metal technology, applied in the field of materials science, can solve the problems of scarcity of raw materials and expensive catalysts, and achieve the effects of reducing production costs, improving electron transport efficiency, and mild synthesis conditions

Inactive Publication Date: 2016-12-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a non-noble metal photocatalytic co-catalyst and its preparation method. The non-noble metal photocatalytic co-catalyst and its preparation method should solve the problem of catalyst in the prior art. Technical issues with high prices and scarce raw materials

Method used

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  • Non-noble metal photocatalysis cocatalyst and preparation method thereof `
  • Non-noble metal photocatalysis cocatalyst and preparation method thereof `
  • Non-noble metal photocatalysis cocatalyst and preparation method thereof `

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Effect test

Embodiment 1

[0016] First prepare graphene oxide with Hummers, then prepare 50ml of 0.4~2mg / ml graphene oxide aqueous suspension by ultrasonication for 1~3h, and add 1ml of CoCL 2 aqueous solution, the CoCl 2 The concentration of the aqueous solution is 20-400 mg / ml, freeze-dried to form a brown powder, and then put it in a tube furnace for 1-2 hours under the atmosphere of argon and ammonia to form a black powder, which is the composite of cobalt nanoparticles and nitrogen-doped graphene non-noble metal photocatalytic cocatalysts.

Embodiment 2

[0017] The characterization of embodiment 2 catalyst

[0018] The microscopic morphology of the catalyst was detected by JEM-2100F transmission electron microscope. In the annular dark field image of the sample, we can see that there are many bright spots uniformly distributed in the carbon matrix, and the particle size is 1~2nm, corresponding to cobalt nanoparticles ( figure 1 ). X-ray electron spectroscopy (XPS) test is carried out on the ESCALAB 250 type X-ray diffractometer. figure 2 Two peaks are shown with binding energies of 779.9 eV and 794.7 eV, respectively. It can be seen in the photocurrent intensity test, after turning on the light source. The photocurrent intensity of the cobalt nanoparticles / nitrogen-doped graphene composite cocatalyst sample increases rapidly and gradually stabilizes after reaching a certain value, while that of pure CdS increases slowly ( image 3 ).

Embodiment 3

[0019] Example 3 Photocatalytic hydrogen production under visible light

[0020] The light source of the photocatalytic activity test reaction is a 300W Xe lamp, and the infrared light part is removed by the cooling circulating water above the reactor, and the ultraviolet light part is removed by a 420nm filter. At room temperature, add a certain amount of deionized water, sacrificial agent ammonium sulfite, and 0.05 g of CdS photocatalyst loaded with 0.5 wt% (Co-NG) into the reactor. The hydrogen reaction system is connected to pump out the air in the system. Using visible light with a wavelength greater than 420nm as the light source, the hydrogen production was measured at regular intervals to study its photocatalytic activity. Finally, the hydrogen production per hour was measured to be 150 mmol, 15 times that of pure CdS, and the photocatalytic activity was significantly improved ( Figure 4 ).

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Abstract

The invention discloses a non-noble metal photocatalysis cocatalyst. The non-noble metal photocatalysis cocatalyst is prepared from cobalt nanometer particles and nitrogen-doped graphene according to a mass ratio of 100-150: 1 through compounding. The invention provides a preparation method of the non-noble metal photocatalysis cocatalyst. The preparation method comprises preparing graphene oxide through Hummers, preparing a graphene oxide aqueous suspension through ultrasonic treatment, adding a CoCl2 aqueous solution into the suspension, carrying out freeze drying to obtain brown powder, putting the brown powder into a tubular furnace in atmospheres of argon and ammonia gas and carrying out calcination to obtain black powder. Cobalt nanometer particles are dispersed and doped in graphene oxide. The inventor successfully develops the cobalt nanometer particle / nitrogen-doped graphene composite cocatalyst with high water photolysis hydrogen production activity. The cocatalyst improves graphene electron transmission efficiency and improves a catalytic reaction active site. The cobalt and nitrogen valence bond produces synergism so that catalyst photocatalytic activity and stability are obviously improved.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a catalyst, in particular to a non-noble metal photocatalytic co-catalyst composed of cobalt nanoparticles with relatively high photocatalytic activity and nitrogen-doped graphene and a preparation method thereof. Background technique [0002] Energy shortage is a major challenge facing mankind at present, and it is also a major issue that must be considered first in my country's implementation of sustainable development strategies. As one of the main forms of new energy, the research, development and application of hydrogen energy has attracted widespread attention. Nanophotocatalysts absorb sunlight, generate excited state electrons, and obtain hydrogen energy by reducing hydrogen ions in water. This approach is considered to be the main way to solve hydrogen energy production technology in the future. An efficient photocatalytic water splitting material system, in addition to...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/75
CPCB01J21/18B01J23/75B01J27/24B01J35/39
Inventor 姚伟峰赵琦
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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