8results about How to "Avoid recombination" patented technology

The invention belongs to the technical field of photocatalysts, and particularly discloses a CoMo6 / Fe3O4 (at) ZnO composite material and a preparation method and application thereof.The photocatalytic mechanism of the prepared CoMo6 / Fe3O4 (at) ZnO composite material is as follows: after the composite material CoMo6 / Fe3O4 (at) CeO2 is excited by light, photo-induced electrons on CoMo6 are transferred to the surface of Fe3O4 (at) ZnO, meanwhile, photo-induced holes absorb an electron donor H2O on the surface of POM polyanions to react to generate. OH, and the CoMo6 / Fe3O4 (at) ZnO composite material is obtained. The. OH free radical with strong oxidation capability oxidizes eosin B to generate oxidation products such as CO2 and the like. In the experiment, a small amount of electrons absorb an electron acceptor O2 and reduce the electron acceptor O2 to generate. O2 <->, and the two free radicals act at the same time to promote the photocatalytic reaction. When a magnetic field is added outside, the oxidation capacity and rate of. OH are also accelerated, so that the degradation rate of eosin B is improved; the highest degradation rate on an eosin B dye can reach 92.21%; after an external magnetic field is applied, the degradation rate is obviously accelerated, and the reaction is almost complete 40 minutes after illumination is started.

The application discloses a kind of Pt nanoparticle load Fe-based MOF photocatalyst and its preparation method and application, belong to environmental energy technical field.The preparation method disclosed in the application uses 2-amino terephthalic acid, FeCl3·6H2O and aqueous solution of chloroplatinic acid hexahydrate as raw material, through hydrothermal reaction, Pt nanoparticle is dispersed in situ and loaded NH2-MIL-101 (Fe), reduces interface charge transfer resistance, inhibits the recombination of photo-generated carriers, to further improve the photocatalytic nitrogen fixation activity, using the synergistic effect of NH2-MIL-101 (Fe) composite photocatalyst containing Pt nanoparticle to achieve the purpose of improving the yield of photocatalytic conversion of nitrogen to ammonia, significantly solve the high energy consumption and environmental pollution problem of traditional industrial nitrogen fixation Haber-Bosch method.

The invention provides a solar cell and a photovoltaic module. The solar cell comprises a silicon substrate, a doped semiconductor layer, an anti-reflection layer and an electrode, the electrode comprises a seed layer and a transmission layer; the doped semiconductor layer is arranged on at least one surface of the silicon substrate; an anti-reflection layer is arranged in at least partial region of one side, deviating from the silicon substrate, of the doped semiconductor layer; the surface of the doped semiconductor layer comprises a target region without an anti-reflection layer; the seed layer is arranged on the side, away from the silicon substrate, of the doped semiconductor layer and at least covers the target area, and the transmission layer is arranged on the side, away from the doped semiconductor layer, of the seed layer; the height of the position in the edge region of the seed layer is greater than the height of the position, deviating from the edge region, in the seed layer. According to the design, the blocking effect of the seed layer on the transmission layer can be improved, and the electrical performance of the solar cell is ensured.

The invention relates to the technical field of photoelectricity, in particular to a laminated solar cell and a preparation method thereof, a power generation device and a power utilization device. The laminated solar cell comprises a top cell, a bottom cell and a middle connecting layer arranged between the top cell and the bottom cell, the middle connecting layer comprises a transparent conductive oxide layer and a doped conductive oxide layer which are stacked, the transparent conductive oxide layer is arranged close to the bottom cell, and the doped conductive oxide layer is arranged close to the top cell; the doped conductive oxide layer is doped with a rare earth element.

This invention belongs to the field of nanocomposite material preparation and application technology, and discloses a method for preparing and applying a dendritic ternary SrCO3-TiO2 / CdS composite material. First, SrCO3-TiO2 nanoparticles are synthesized using a simple hydrothermal one-pot method with tetrabutyl titanate and Sr(NO3)2 as raw materials. These nanoparticles are then dispersed in deionized water to form a suspension. Finally, a dendritic ternary SrCO3-TiO2 / CdS composite material is prepared using an in-situ hydrothermal growth method. The dendritic ternary SrCO3-TiO2 / CdS composite material prepared by this invention can be used to produce hydrogen peroxide under visible light and simultaneously degrade oxytetracycline. The dendritic ternary SrCO3-TiO2 / CdS composite material prepared by this invention forms a unique dendritic structure by combining SrCO3-TiO2 composite particles with CdS. By utilizing the synergistic effect among the three, the transport and separation of photogenerated electron pairs at the interface are accelerated, and their recombination is effectively inhibited, thereby improving the catalytic activity of the dendritic ternary SrCO3-TiO2 / CdS composite material. It has broad application prospects in the synthesis of green chemicals and water pollution treatment.

The application relates to the technical field of semiconductor photoelectric devices, and particularly relates to a nanocrystal detection chip capable of perceiving multi-spectrum (covering 300 nm-15 mu m). By adopting a solution processing type nanocrystal thin film, rigid dependence on expensive single crystal infrared epitaxial wafers such as indium gallium arsenide (InGaAs) and indium antimony arsenide (InAsSb) of a traditional infrared detector is effectively broken, a patterned nanocrystal filter layer is prepared on an independent transparent optical substrate, a multi-band spectral modulation array is constructed through multiple photoetchings, and high-precision vertical heterojunction integration is realized with a bottom photoreceptive pixel. By utilizing the band tunable characteristics of nanocrystal materials, the physical band gap limitation of a traditional silicon-based sensor is broken, and full-spectrum photoelectric detection response from ultraviolet, visible light to medium-long wave infrared (300 nm-15 mu m) is realized. The application forms an in-situ physical barrier through a vertical heterojunction integration structure, and at the same time of completing micron-level spectral spectral modulation, reliable physical isolation and chemical protection are provided for the fragile nanocrystal active layer.

This invention discloses a heterogeneous nanostructure photocatalyst, its preparation method, and its application. The invention modifies the surface of the g-C3N4 photocatalyst by introducing carbon quantum dots (CDs) through doping technology. The CDs / g-C3N4 composite photocatalyst abandons conventional metal catalysis, and its preparation process is simple, low-cost, and reusable without deactivation, making it a promising new composite photocatalyst in the field of visible light catalytic oxidation technology. Applying this catalyst to the visible light selective catalytic oxidation synthesis of the key intermediate 3-(4-nitro-1-oxo-1,3-dihydro-2H-isoindol-2-yl)piperidine-2,6-dione demonstrates good yields.

The invention belongs to the technical field of functional materials, and particularly relates to a phosphoric acid functionalized nickel porphyrin covalent organic framework / carbon nanotube composite material, which comprises: a nickel porphyrin covalent organic framework, which is a polymer formed by connecting a plurality of nickel porphyrin monomers through a covalent organic framework ligand; the carbon nano tube and the nickel porphyrin covalent organic framework form a heterojunction through in-situ growth; and the phosphoric acid functional group is chemically bonded on the covalent organic framework ligand of the nickel porphyrin covalent organic framework in the form of an alpha-phosphoramidate bond. The composite material provided by the invention integrates the photocatalytic reduction of nickel porphyrin, the photothermal conversion of carbon nanotubes and the selective adsorption function of phosphate groups on uranium, and the three components cooperate to form a virtuous cycle of rapid mass transfer, efficient capture, in-situ reduction and active site regeneration, so that the efficiency and rate of extracting uranium from seawater are greatly improved.