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Cobaltous oxide slice, preparation method thereof and application of cobaltous oxide slice in visible-light photocatalysis total-decomposition of water

A cobalt oxide, flake technology, applied in the field of photocatalytic water splitting, to achieve the effect of excellent performance, high activity and stability

Active Publication Date: 2019-10-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to light absorption and energy band matching, it is usually difficult for a single catalyst to achieve photocatalytic water splitting in pure water.

Method used

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  • Cobaltous oxide slice, preparation method thereof and application of cobaltous oxide slice in visible-light photocatalysis total-decomposition of water
  • Cobaltous oxide slice, preparation method thereof and application of cobaltous oxide slice in visible-light photocatalysis total-decomposition of water
  • Cobaltous oxide slice, preparation method thereof and application of cobaltous oxide slice in visible-light photocatalysis total-decomposition of water

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preparation example Construction

[0038] The invention provides a method for preparing cobaltous oxide flakes, comprising the following steps:

[0039] S1. Using sodium chloride as a template and cobalt acetate as a cobalt source, obtain precursor flakes through hydrothermal reaction or solvothermal reaction;

[0040] S2. Calcining the precursor flakes at 200-300° C. in an inert atmosphere to obtain sphalerite-type cobaltous oxide flakes.

[0041] Aiming at the status quo of visible light catalytic total water splitting in the prior art, this application provides a preparation method of sphalerite-type CoO ultra-thin flakes. The ultra-thin flakes prepared above can realize the catalytic decomposition of water under visible light, and the product Has high stability.

[0042] Specifically, the embodiment of the present invention discloses a preparation method of sphalerite-type CoO ultrathin flakes, including the following steps:

[0043] Sodium chloride and cobalt acetate are dispersed and reacted in water or...

Embodiment 1

[0063] Add 320mg of sodium chloride and 500mg of cobalt acetate tetrahydrate into 20mL of water, stir vigorously at room temperature for 30min, pre-cool the resulting reaction solution, put it into a freeze dryer, and freeze-dry for 24h to obtain a precursor powder; take 50mg of the obtained precursor powder In a tube furnace, calcined at 240°C for 3 hours in a high-purity argon atmosphere, took it out after natural cooling to obtain a powder product, washed with water to remove sodium chloride, centrifuged to obtain a sample, and dried the sample in a vacuum oven at 60°C for 10 hours to obtain 10-13mg of powder, that is, sphalerite-type CoO flakes.

[0064] The compound prepared in Example 1 is carried out structural identification, the results are shown in Figure 3 ~ Figure 6 , image 3 The curve a in the middle is the X-ray diffraction (XRD diffraction) pattern of the sphalerite-type CoO flakes prepared in this example, where the ordinate is the intensity (Intensity), and...

Embodiment 2

[0073] Add 320mg of sodium chloride and 500mg of cobalt acetate tetrahydrate into 20mL of water, stir vigorously at room temperature for 30min, and dry the resulting reaction solution at 65-75°C for 24h to obtain a precursor powder; take 50mg of the obtained precursor powder in a tube furnace, Calcined at 240°C for 3 hours in a high-purity argon atmosphere, cooled naturally to obtain a powder product, washed with water to remove sodium chloride, and then centrifuged to obtain a sample, dried the sample in a vacuum drying oven at 60°C for 10 hours to obtain 10-13 mg of powder, That is, sphalerite-type CoO flakes, whose TEM photos are as follows Figure 12 shown.

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Abstract

The invention provides a cobaltous oxide slice. The cobaltous oxide slice is of a zinc blende structure, and has a nanosheet morphology. The invention discloses a method for preparing the zinc blende-type CoO ultrathin slice, which comprises the steps: dispersing sodium chloride and cobalt acetate in water for a reaction so as to obtain a precursor, and calcining the precursor at a specific temperature in an inert atmosphere so as to obtain the zinc blende-type CoO ultrathin slice. The invention also provides a method for achieving visible-light total decomposition of water by using the zinc blende-type CoO ultrathin slice. It is shown through experimental results that the zinc blende-type CoO ultrathin slice has higher performance in visible-light total-decomposition of water and higher stability than rock salt-mine-type CoO ultrathin sheets, and the formation rates of H2 and O2 under irradiation of visible light by means of the cobaltous oxide slice are 4.43 [mu]mol.g<-1>.h<-1> and 2.63 [mu]mol.g<-1>.h<-1> separately.

Description

technical field [0001] The invention relates to the technical field of photocatalytic water splitting, in particular to a cobaltous oxide flake, its preparation method and its application in visible light catalytic total splitting of water. Background technique [0002] With the rapid development of society, how to effectively solve energy and environmental problems has become a worldwide problem. Among the many renewable clean energy sources, solar energy has the advantages of being inexhaustible and inexhaustible, so it is undoubtedly the most potential. However, the use of solar energy has the disadvantages of low energy density, uneven distribution, and difficulty in storage. If solar energy can be efficiently converted into a form of energy with higher energy density and easier storage, the energy and environmental problems faced by the development of human society are expected to be resolved. [0003] Hydrogen energy is a clean energy with high energy density. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y40/00B01J23/75C01B3/04
CPCC01G51/04B82Y40/00B01J23/75C01B3/042C01P2004/03C01P2002/72C01P2004/04C01P2004/20B01J35/00B01J35/30B01J35/39Y02E60/36
Inventor 孙永福徐嘉麒谢毅
Owner UNIV OF SCI & TECH OF CHINA
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