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Author

Li En

Bio: Li En is an academic researcher from Hubei University. The author has contributed to research in topics: Catalysis & Hydrogen production. The author has an hindex of 1, co-authored 3 publications receiving 4 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, graphitic carbon nitride (GCN) is used as sacrifice agent to synthesize is nitrogen and carbon co-doped CdS nanoparticles with of uniform small size and higher specific surface area via hydrothermal reaction.

12 citations

Patent
24 Dec 2019
TL;DR: In this paper, a preparation method of a CdS-based composite photocatalyst and an application thereof in hydrogen production by water splitting is presented, and the preparation method comprises the following steps: sequentially adding prepared cadmium chloride, graphite phase g-C3N4 and thiourea into a sodium citrate solution, completely stirring the components for complete dissolution, and adding alkalito adjust the pH value to 3.5-4.5.
Abstract: The invention discloses a preparation method of a CdS-based composite photocatalyst and an application thereof in hydrogen production by water splitting. The preparation method comprises the followingsteps: sequentially adding prepared cadmium chloride, graphite phase g-C3N4 and thiourea into a sodium citrate solution, completely stirring the components for complete dissolution, and adding alkalito adjust the pH value to 3.5-4.5; and carrying out hydrothermal reaction on the solution, and carrying out post-treatment to obtain the CdS-based composite photocatalyst. The application of the catalyst in water splitting hydrogen production comprises the following steps: dissolving catalyst powder into water in a photochemical reactor, adding chloroplatinic acid and L-ascorbic acid, irradiatingvisible light under a xenon lamp in an inert gas atmosphere, and detecting the hydrogen yield. The preparation method is simple, environmentally friendly and low in cost, and the prepared nanoscale CdS-based composite photocatalyst is high in catalytic efficiency and large in hydrogen production amount when used for hydrogen production through water splitting.

1 citations

Patent
15 Nov 2019
TL;DR: In this paper, the strength of closed-cell foamed aluminum is improved by adding pre-treated basaltfibers into aluminum or an aluminum alloy melt based on a melt foaming method.
Abstract: The invention relates to a preparation method for improving strength of closed-cell foamed aluminum and belongs to the field of porous metal materials. In order to overcome the defect that a closed-cell foamed aluminum material is non-uniform in pore structure and low in strength, the strength of the closed-cell foamed aluminum is improved by way of fiber strengthening by adding pre-treated basaltfibers into aluminum or an aluminum alloy melt based on a melt foaming method. The prepared closed-cell foamed aluminum material has the characteristics of being low in preparation price, simple in process, controllable in pore structure and strength and the like.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: Chalcogenides are narrow-band gap semiconductors that have been widely used as photocatalysts as mentioned in this paper, which allow more efficient absorption of over 40% of solar energy in the visible light range.
Abstract: Chalcogenides are narrow-band gap semiconductors that have been widely used as photocatalysts. These narrow-band gap materials allow more efficient absorption of over 40% of solar energy in the visible light range, which will eventually improve its photocatalytic properties. Under visible light irradiation, these materials generate electron and hole (e−/h+) pairs. Photo-generated e−/h+ pairs have been utilized to split water into hydrogen and oxygen and to remove and degrade industrial, pharmaceutical and agricultural organic/inorganic/biological pollutants that have been accumulated in the environment. In this perspective review, different types of chalcogenides, namely, binary, multinary (ternary and quaternary) and chalcogenide-based heterostructures are presented briefly. This perspective review also highlights the mechanisms involved and remarkable photocatalytic activity enhancement under visible light irradiation that has been widely researched such as the photocatalytic degradation of industrial pollutants and photocatalytic inactivation of bacteria. Lastly, future prospects for the use of chalcogenides as photocatalysts and chalcogenide-based heterostructures were discussed.

39 citations

Journal ArticleDOI
TL;DR: In this paper, a hierarchical binary CdS/NiO hollow heterogeneous architectures (HHAs) with p-n heterojunction are constructed by a facile microwave-assisted wet chemical process for high-efficient photocatalytic hydrogen evolution reaction (HER) from water.
Abstract: The hierarchical binary CdS/NiO hollow heterogeneous architectures (HHAs) with p-n heterojunction are constructed by a facile microwave-assisted wet chemical process for high-efficient photocatalytic hydrogen evolution reaction (HER) from water. The asdesigned CdS/NiO HHAs are composed of hexagonal n-type CdS nanoparticles with a size in the range of 20–40 nm attaching to cubic p-type NiO hollow microspheres (HMSs) which are aggregates of porous nanoplates with a thickness of about 20 nm. The photocatalytic water splitting over CdS/NiO HHAs is significantly increased under simulated solar irradiation, among which the most active sample of CdS/NiO-3 (the mass ratio of CdS to NiO is 1:3) exhibits the fastest photocatalytic HER rate of 1.77 mmol·g−1·h−1, being 16.2 times than that of pure CdS. The boosted photocatalytic HER could be attributed to the synergistic effect on the proportional p-n heterojunction with special hierarchical hollow and porous morphology, an enhancement of visible light absorption, and an improvement of photoinduced charge separation as well as the photo-stability given by the composite heterojunction. This work shows a viable strategy to design the heterojunction with special morphology for the efficient hydrogen generation by water splitting utilizing solar energy.

24 citations

Journal ArticleDOI
TL;DR: In this paper , the authors used the imidazolium salt zeolite framework (ZIFs) organometallic framework materials for preparing photocatalytic semiconductors and showed that the Co3O4 material obtained by this method not only has a unique spatial morphology but also shows a strong light absorption performance and a high charge transfer rate.
Abstract: The imidazolium salt zeolite framework (ZIFs) organometallic framework materials have the advantages of high stability and controllable structure and are excellent materials for preparing photocatalytic semiconductors. In this study, the regular dodecahedron material ZIF‐67 was used as the substrate, and the intermediate was calcined after the substrate adsorbed Co‐based metal clusters to obtain Co3O4 with a hollow double‐shell structure. Through SEM and fluorescence detection, it can be seen that the Co3O4 material obtained by this method not only has a unique spatial morphology but also shows a strong light absorption performance and a high charge transfer rate. In addition, graphite‐like phase carbon nitride (g‐C3N4), as a traditional catalyst, has been unable to move toward industrialization due to its low electron utilization and light absorption properties. So here, the composite catalyst CNCO‐x (x = 1, 2, 2, 3, 4, and 5) was prepared by simply anchoring Co3O4 and g‐C3N4 to improve the catalytic performance of g‐C3N4. The results show that the introduction of Co3O4 not only improves the electron utilization of g‐C3N4 but forms a charge transfer bridge channel (p‐n heterojunction) after contact between the two, which effectively promotes the rapid transfer of photoelectrons between the contact interfaces. Finally, when the amount of Co3O4 introduced is 15%, the amount of hydrogen produced in 5 hours can reach 0.163 mmol (3.26 mmol g−1 hour−1), which is 163 times that of pure g‐C3N4.

8 citations

Journal ArticleDOI
TL;DR: In this paper , the Co3O4/ZnIn2S4 p−n heterojunction photocatalyst was successfully prepared using the block stacked by Co 3O4 nanosheets as the carrier.
Abstract: The Co3O4/ZnIn2S4 p‐n heterojunction photocatalyst was successfully prepared using the block stacked by Co3O4 nanosheets as the carrier. Because the surface of the Co3O4 nano‐block is rough, it is easy to absorb more ZnIn2S4 nanosheets, which leads to the tight coupling of composite Co3O4/ZnIn2S4. In addition, the interaction of the p‐n heterojunction interface accelerates the separation of photogenerated carriers, thus increasing the rate of photocatalytic hydrogen evolution. In the photocatalytic hydrogen evolution test, the composite Co3O4/ZnIn2S4 showed excellent hydrogen evolution performance, and the maximum hydrogen evolution capacity was up to 72.01 μmol, which was about 5.6 times that of pure Co3O4. Under the action of the built‐in electric field, the accumulation of electrons and holes in the ZnIn2S4 conduction band and Co3O4 valence band is accelerated, thus higher separation efficiency is achieved. The addition of various characterizations also confirmed the excellent properties of the composites. This work provides a reference for the construction of photocatalytic heterojunction.

7 citations

Journal ArticleDOI
TL;DR: In this paper , the Co3O4/ZnIn2S4 p-n heterojunction photocatalyst was successfully prepared using the block stacked by Co3 o4 nanosheets as the carrier.
Abstract: The Co3O4/ZnIn2S4 p-n heterojunction photocatalyst was successfully prepared using the block stacked by Co3O4 nanosheets as the carrier. Because the surface of the Co3O4 nano-block is rough, it is easy to absorb more ZnIn2S4 nanosheets, which leads to the tight coupling of composite Co3O4/ZnIn2S4. In addition, the interaction of the p-n heterojunction interface accelerates the separation of photogenerated carriers, thus increasing the rate of photocatalytic hydrogen evolution. In the photocatalytic hydrogen evolution test, the composite Co3O4/ZnIn2S4 showed excellent hydrogen evolution performance, and the maximum hydrogen evolution capacity was up to 72.01 μmol, which was about 5.6 times that of pure Co3O4. Under the action of the built-in electric field, the accumulation of electrons and holes in the ZnIn2S4 conduction band and Co3O4 valence band is accelerated, thus higher separation efficiency is achieved. The addition of various characterizations also confirmed the excellent properties of the composites. This work provides a reference for the construction of photocatalytic heterojunction.

6 citations