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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  • Abstract
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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 n

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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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Example Embodiment

[0015] Example 1

[0016] First, Hummers is used to prepare graphene oxide, and then ultrasonic for 1~3h to prepare 0.4~2mg / ml graphene oxide aqueous suspension 50ml, and add 1ml 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, then it is calcined in a tube furnace under argon and ammonia atmosphere for 1~2h to form a black powder, which is a composite of cobalt nanoparticles and nitrogen-doped graphene The non-precious metal photocatalytic promoter.

Example Embodiment

[0017] Example 2 Characterization of the catalyst

[0018] The microscopic morphology of the catalyst was tested by JEM-2100F transmission electron microscope. In the ring-shaped dark-field image of the sample, we can see that there are many bright points uniformly distributed in the carbon matrix, the particle size is 1~2nm, corresponding to the cobalt nanoparticles ( figure 1 ). The X-ray electron spectroscopy (XPS) test is performed on ESCALAB 250 X-ray diffractometer. figure 2 It shows that the binding energies of the two peaks are 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 nanoparticle / nitrogen-doped graphene composite promoter sample increased rapidly and gradually stabilized after reaching a certain value, while the photocurrent intensity of pure CdS increased slowly ( image 3 ).

Example Embodiment

[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 through the cooling circulating water above the reactor, and the ultraviolet light part is removed using a 420nm filter. At room temperature, add a certain amount of deionized water, sacrificial ammonium sulfite, and 0.05g of CdS photocatalyst loaded with 0.5wt% (Co-NG) into the reactor at room temperature. After stirring for a while, the reactor and photolysis water The hydrogen reaction system is connected to exhaust the air in the system. Use visible light with a wavelength greater than 420nm as the light source, and measure its hydrogen production at regular intervals to study its photocatalytic activity. Finally, the measured hydrogen production per hour is 150 mmol, which is 15 times that of CdS alone, and the photocatalytic activity is 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
CPCB01J27/24B01J21/18B01J23/75B01J35/004
Inventor 姚伟峰赵琦
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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