137results about How to "Enhanced light absorption" patented technology

The invention relates to an intelligent photovoltaic power generation control device which integrates a photovoltaic power generation panel, a series connection base, a supporting assembly, a water collection groove, a rainwater collection assembly, a cleaning assembly and a control assembly. A series base and a series interface are arranged below the photovoltaic panel, so that modular installation is facilitated; the supporting assembly comprises two supporting rods, the light following function is achieved, and the photovoltaic panel is automatically adjusted to face the sun. A water collecting groove above the photovoltaic panel and a rainwater collecting assembly at the bottom of the photovoltaic panel can collect and store rainwater; the cleaning assembly comprises a spraying unit and a cleaning brush and is used for automatically cleaning the surface of the photovoltaic panel; the control assembly monitors operation of the system and adjusts the posture of the photovoltaic panel and work of the cleaning assembly. Redundant electricity generated by the photovoltaic power generation panel in sunny days is stored for the system to use, and the light following function is not started in cloudy days, so that electric energy is saved; through the design, the efficiency and sustainability of photovoltaic power generation are improved; the energy conversion efficiency can be improved, the reliability and automation level of the system are enhanced, and the utilization and environmental friendliness of rainwater are improved.

The invention provides a photo-thermal material based on RE-MOF, a photo-thermal interface evaporator and a preparation method and application of the photo-thermal material. The photo-thermal material based on the RE-MOF comprises a two-dimensional nanosheet-shaped rare earth MOF material and a polydopamine coating layer on the surface of the rare earth MOF material. According to the photo-thermal material based on RE-MOF, the rare earth MOF material is coated with polydopamine, so that the photo-thermal material has high light absorption capacity and hydrothermal stability, the evaporation efficiency and photo-thermal conversion capacity of a photo-thermal interface evaporator can be effectively improved, the photo-thermal conversion capacity of the photo-thermal interface evaporator can be effectively improved when the photo-thermal material is applied to the photo-thermal interface evaporator, and the photo-thermal efficiency of the photo-thermal interface evaporator is improved. The photo-thermal interface evaporator which is high in sunlight absorption capacity, stable in performance structure, high in photo-thermal conversion efficiency and good in salt tolerance can be obtained.

The invention provides an intelligent tracking and damping system for a photovoltaic support, and belongs to the technical field of intelligent light tracking and damping, and the system comprises an illumination collection module which is used for installing a preset sensor group on the photovoltaic support and collecting real-time illumination information; the light following adjustment module is used for determining a bracket angle coefficient based on the real-time illumination information and converting the bracket angle coefficient into a specific control motion parameter, and a control device adjusts the position of the photovoltaic panel according to the received control motion parameter and judges whether light following is completed or not through a preset light following algorithm; the vibration acquisition module is used for deploying a preset sensor at a key node of the bracket and acquiring vibration data of the bracket in real time; and the damping implementation module is used for analyzing the real-time vibration data and reducing vibration of the bracket based on an analysis result and a preset method. The stability and the power generation efficiency of a photovoltaic system in a complex environment are remarkably improved, and the system has relatively high intelligence and adaptability.

The invention discloses a near-infrared light response ultrathin nanosheet sulfur-doped BiOCl photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following technical steps: (1) preparing a BiOCl nanosheet; and (2) preparing the sulfur-doped BiOCl nanosheet. By adopting a secondary hydrothermal method and controlling the dosage of thioacetamide and BiOCl nanosheets, the prepared catalyst is an ultrathin nanosheet with uniform morphology, the average size is 70-120nm, the catalyst has light response in a near-infrared light region of 780-1200nm, the light absorption capacity of the catalyst is better, and near-infrared light response can be achieved. The catalyst is applied to catalytic degradation of ENR, the ENR degradation rate under visible light is 66.87%, and the degradation effect is good; under near-infrared light, the ENR degradation rate is 9.25%, and the degradation performance from zero to existence is achieved. The preparation method disclosed by the invention is simple, mild in condition, easy to control, low in raw material consumption, free of complex operations such as centrifugation, low in preparation cost and easy to popularize and apply.

The invention discloses a preparation method of photo-thermal super-hydrophobic flame-retardant polyurethane sponge for oil-water separation, which comprises the following steps: introducing a polydopamine (PDA) / MXene material into polyurethane foam through a simple one-step foaming method, then introducing a nitrogen-phosphorus-silicon hybrid flame retardant N3P3 [NH (CH2) 3Si (OEt) 3] 6 through dip-coating and a sol-gel method, and finally preparing the photo-thermal super-hydrophobic flame-retardant polyurethane sponge for oil-water separation. The preparation method of the flame-retardant photo-thermal super-hydrophobic polyurethane sponge for oil-water separation is obtained. The polyurethane sponge prepared by the method not only has stable super-hydrophobicity, excellent photo-thermal conversion performance and excellent adsorption capacity to oil products, but also has better thermal stability.

The invention provides an all-dielectric resonance enhanced photoelectric detector and a manufacturing method thereof, and belongs to the field of micro-nano processing and silicon-based photoelectric detectors. The enhanced photoelectric detector comprises a bottom SOI (Silicon On Insulator) substrate; the first Si doping layer is arranged above the substrate; the semiconductor absorption layer is arranged above the first Si doping layer, the interior of the semiconductor absorption layer is designed to be a periodic layered artificial unit, after incident light enters, remarkable local field enhancement is achieved on the layer, and photon-generated carriers are generated; the second Si doping layer is arranged above the semiconductor layer; and the deposition passivation layer is arranged on the uppermost layer and is used for protecting the surface of the metasurface. According to the high-speed photoelectric detector based on all-dielectric metasurface enhancement, the responsivity of the detector can be improved, and meanwhile the problem of mutual restriction between response bandwidth and the responsivity is solved.

The invention discloses a Co-MOF / TiO2 heterojunction-based photocatalysis-PMS activation catalyst and a preparation method and application thereof, specifically, TiO2 nanosheets and porphyrin-based MOF are coupled to construct a Co-MOF / TiO2 heterojunction hybrid material, and the material has the performance of synergistic photocatalysis of peroxymonosulfate activation and is used for catalyzing degradation-resistant bisphenol A, PMS, PMS, PMS, PMS, PMS and PMS. The compound is an effective synergistic photocatalyst and has many advantages that (i) the porous structure of the metal organic framework promotes mass transfer in the catalytic process, so that the catalytic process is further promoted; (ii) a chromophore at the center of a porphyrin structure can enhance the light capturing ability of the metal organic framework (under visible light, photoinduced electrons can be continuously migrated to adsorbed PMS to promote the activation process of the PMS); and (iii) the heterojunction formed between the TiO2 and the Co-porphyrin ligand further promotes the separation of photon-generated carriers.

The invention belongs to the technical field of photoelectrocatalysis ammonia synthesis catalysts, and particularly relates to a preparation method of a self-decomposition composite catalyst and application of the self-decomposition composite catalyst to construction of a photoelectrochemical cell in ammonia production. The preparation method of the self-decomposition composite catalyst comprises the following steps: mixing and dissolving cupric acetate, cobaltous acetate and urea, placing the mixture and a treated titanium mesh in a reaction kettle, carrying out hydrothermal treatment to obtain a precursor material, carrying out self-decomposition on CuCo2O4 in a calcining process in a muffle furnace to generate CuO and form an interface-free heterojunction so as to obtain a catalyst-loaded integrated electrode, and carrying out self-decomposition on the catalyst-loaded integrated electrode so as to obtain the self-decomposition composite catalyst. The catalyst is used for producing ammonia through photoelectrocatalysis nitrate reduction. The photoelectrochemical cell constructed by the integrated electrode disclosed by the invention has the characteristics of high Faraday efficiency, high ammonia yield, high conversion rate, excellent repeatability and the like, and has the advantages of low cost, simple process, environmental protection, no pollution and energy conservation.

The invention discloses a preparation method and application of a nickel-titanium composite catalyst, and the preparation method of the nickel-titanium composite catalyst comprises the following steps: (1) roasting TiO2 in the presence of a reducing gas to obtain an intermediate; and (2) mixing and heating the intermediate obtained in the step (1) and a Ni precursor solution, and roasting in the presence of reducing gas to prepare the nickel-titanium composite catalyst. The preparation method of the catalyst provided by the invention has the advantages of easily available raw materials, simple process and easiness in industrialization. By changing the particle size of the TiO2 carrier, the interaction between metal Ni / TiO2 can be effectively adjusted, then the Ni / TiO2 photo-generated charge separation efficiency is adjusted, and finally the selectivity of a carbon dioxide hydrogenation reaction product is adjusted. The catalyst provided by the invention can realize photothermal conversion without an external heating device, and the nickel-titanium composite catalyst can realize strong light absorption under a full spectrum.

The invention discloses a mid-infrared light detector and a preparation method thereof, and belongs to the technical field of light detection.The light detector comprises a piezoelectric substrate, and a Van der Waals heterojunction, an input interdigital transducer and an output interdigital transducer are arranged on the piezoelectric substrate; the input interdigital transducer and the output interdigital transducer are symmetrically arranged on two sides of the Van der Waals heterojunction; the input interdigital transducer is used for generating a surface acoustic wave according to the alternating current signal; and the output interdigital transducer is used for receiving the surface acoustic wave signal passing through the Van der Waals heterojunction and outputting the signal. According to the device, a periodic strain field and a piezoelectric field are formed on the surface of a substrate through surface acoustic waves, graphene plasmons are excited, mid-infrared light absorption is enhanced, photo-generated electron-hole space separation is promoted, photo-generated carrier recombination is inhibited, a photoelectric response signal is converted into an acoustoelectric signal, and the photoelectric response signal is converted into an acousto-electric signal. And high-performance mid-infrared light detection is realized by using the high-sensitivity response characteristic of the surface acoustic wave device to acoustoelectric interaction.

The invention belongs to the technical field of water treatment, and relates to a method for removing new pollutants in water by using a far ultraviolet assisted sodium hypochlorite system. The method comprises the following steps: S1, adjusting the pH value of a to-be-treated aqueous solution containing new pollutants to 4-10; s2, adding a sodium hypochlorite oxidizing agent into the aqueous solution to be treated and continuously stirring; and S3, carrying out a reaction under the ultraviolet wavelength of 200 to 230 nm. Compared with the prior art, the method has the advantages that the far ultraviolet light source and the sodium hypochlorite are jointly applied, so that the oxidation capacity of the sodium hypochlorite is improved, meanwhile, the high-energy characteristic of far ultraviolet light is fully played, efficient photocatalytic degradation of new pollutants difficult to degrade is realized, and the overall water treatment efficiency is remarkably improved.

The invention discloses a MoO2 / Mo2N composite material and a preparation method and application thereof.The MoO2 / Mo2N composite material is provided with a MoO2 and Mo2N mixed phase, the preparation method comprises the steps that a MoO3 precursor is placed in an open container, the open container is placed in an ammonia atmosphere to be subjected to calcination treatment, the MoO2 / Mo2N composite material is obtained, and the MoO2 / Mo2N composite material can be applied to photocatalytic CO2 reduction reaction. The method comprises the following steps: putting the composite material into a reactor with a quartz window, introducing a CO2 / H2O or CO2 / H2 mixed reactant, and reducing CO2 under an illumination condition. According to the invention, the problems of complex material synthesis process and high cost in the existing method are solved, and the synthesized MoO2 / Mo2N composite material is applied to photocatalytic CO2 reduction and has good reaction activity and stability.

The invention relates to application of iron-doped carbon nitride rich in nitrogen vacancies, in particular to application of the iron-doped carbon nitride rich in the nitrogen vacancies in degradation of active pharmaceutical compounds based on a degradation system of UV-LED / NaClO and / or UV-LED / NH2Cl. The removal rates of the UV-LED / NaClO / Fe-g-C3N4-Nv degradation system and the UV-LED / NH2Cl / Fe-g-C3N4-Nv degradation system on carbamazepine are as high as 98.3% and 67.2% respectively, the oxidation capacity of g-C3N4 is enhanced through iron doping, a new intermediate energy level is formed through introduction of nitrogen vacancy, the effect of an electron capturer is achieved, a new electron transmission channel is formed under the combined action of iron doping and nitrogen vacancy, and the degradation efficiency of carbamazepine is improved. The migration rate of electrons and the separation efficiency of photon-generated carriers are obviously improved; meanwhile, the Fe-g-C3N4-Nv achieves efficient activation of NaClO and NH2Cl through O2.-and hvb + under UV-LED irradiation, the yield of HO., RCS and RNS in a degradation system is increased, the adaptability to water quality fluctuation is high, and stable degradation of pharmaceutical active compounds can be achieved.

The invention provides a preparation method of a carbon-doped carbon nitride material, which is characterized by comprising the following specific steps: (1) prepolymerization: mixing melamine and 2, 4, 6-triaminopyrimidine powder according to a certain proportion, heating to 400-450 DEG C in a protective gas atmosphere, and calcining to form prepolymer carbon-doped melem; (2) supramolecular modification: taking 0.5 g of carbon-doped melem obtained in the step (1), adding the carbon-doped melem into 25 mL of a hydrochloric acid aqueous solution with a certain concentration, carrying out ultrasonic oscillation dispersion, placing the mixture in a fuming cupboard to naturally evaporate water and excessive hydrochloric acid, and further drying and grinding the mixture to obtain a hydrogen-halogen bond connected carbon-doped heptazine supramolecular precursor; and (3) preparing carbon nitride through high-temperature calcination: calcining the hydrogen-halogen bond connected carbon-doped heptazine supermolecule precursor obtained in the step (2) at 500-600 DEG C for 2-6 hours, cooling, crushing and grinding to obtain the carbon-doped carbon nitride photocatalytic material.According to the method provided by the invention, a prepolymer is prepared firstly, has relatively high thermal stability and a heptazine skeleton structure which is the same as g-C3N4, and is used for preparing the carbon nitride photocatalytic material. The preparation method comprises the following steps: firstly, carrying out supermolecule modification through hydrochloric acid, and finally, carrying out high-temperature calcination, so that rich pore structures can be obtained, the absorption capacity of the material to sunlight and the adsorption capacity of the material to reactant molecules can be improved, the framework structure integrity of the material can also be improved, an unblocked transmission channel is provided for photon-generated carriers, and the photocatalytic efficiency is improved.

The invention discloses an ultra-black coating with wide-angle absorption as well as a preparation method and application of the ultra-black coating, and belongs to the technical field of ultra-black coatings and preparation of the ultra-black coatings. The problem that an existing ultra-black coating cannot present extremely low scattering and high absorptivity under large-angle incident light is solved. According to the method, carbon black is used as an absorbent, a high-temperature-resistant silica sol solution is used as a binder, a stable structure is formed by adopting a one-step sintering method, and meanwhile, an ultra-black coating with a forest-shaped light trap array structure is constructed. The refractive index of the surface of the coating is obviously changed by utilizing the forest-shaped array structure on the surface of the ultra-black coating, so that the optical reflection of the surface is reduced; the surface forest-like light trap structures are closely arranged, so that light incident from each angle can be reflected back and forth in the structure, the incident light is absorbed to the greatest extent, stable high light absorption at a wide angle is realized, the reflectivity of the ultra-black coating does not change obviously along with the angle of the incident light, and the deep space detection precision of a space optical system is improved.

The invention discloses a transition metal sulfide heterojunction with wide spectral response as well as a preparation method and application of the transition metal sulfide heterojunction. The transition metal sulfide heterojunction is prepared from the following raw materials: Na2WO4 (1 to 3 mmol), NaCl (2 to 4 mmol), ZnCl2 (0.5 to 1 mmol), InCl3 (1 to 2 mmol), C2H5NS (2 to 4 mmol) and glycerol (8 to 12 mL). The preparation method comprises the following steps: by taking Na2WO4 and NaCl as reactants and water as a solvent, synthesizing a WO3 nanorod by adopting a solvothermal method; the preparation method comprises the following steps: synthesizing WO3 nanorod solid powder, putting the synthesized WO3 nanorod solid powder into a high-temperature reaction furnace filled with argon-hydrogen mixed gas to obtain an oxygen vacancy-containing WO3 (WOx) nanorod, dissolving ZnCl2, InCl3 and C2H5NS into a mixed solvent of water and glycerol, adding the WOx nanorod into the solution, and growing a ZnIn2S4 nanosheet on the surface of the WOx nanorod in situ by using an oil bath method to finally obtain the transition metal sulfide heterojunction. The prepared heterojunction has obvious one-dimensional / two-dimensional structural characteristics, and due to the photo-thermal effect induced by oxygen vacancies and the synergistic effect of providing additional photo-generated charge transfer channels, the prepared transition metal sulfide heterojunction structure shows efficient performance of producing hydrogen by photo-thermal catalytic decomposition of water.

The invention discloses a metal complex type non-fullerene electron acceptor material, a preparation method and application, and relates to the technical field of organic photovoltaic devices, the novel metal complex type non-fullerene electron acceptor material is designed and synthesized by introducing metal ions into non-fullerene acceptor molecules. By reasonably designing the structure of the metal complex, the extinction coefficient of the material is remarkably improved, so that the material has higher light absorption capacity under unit thickness, and the light capture efficiency is improved. Heavy metal elements in the metal complex have relatively long excited state life and relatively strong carrier migration characteristics, so that the life of a photon-generated carrier is effectively prolonged, the recombination loss is reduced, and the photoelectric conversion efficiency is further improved. By introducing the metal complex, the charge transmission performance of a non-fullerene receptor is enhanced, the problems of short exciton diffusion distance and high exciton recombination rate in a traditional organic semiconductor material are solved, and photon-generated carriers can be effectively separated and migrated in a thin active layer.

The invention relates to a preparation method of TiO2 and TiO2 / ZnO heterojunction based on a hollow structure and application of the TiO2 and TiO2 / ZnO heterojunction in an ultraviolet detector, the hollow structure TiO2 is a TiO2 hollow sphere, a TiO2 hollow cube and a TiO2 hollow dodecahedron, the hollow heterostructure is composed of the hollow structure TiO2 and a ZnO nanorod, the ZnO nanorod grows on the surface of the TiO2 hollow structure, and the whole ZnO nanorod is hedgehog-shaped; the prepared hollow-structure TiO2 and TiO2 / ZnO heterojunction is coated on a conductive surface of FTO conductive glass to prepare a working electrode, the working electrode is connected with a counter electrode through a heat sealing film, electrolyte is injected into an internal cavity to obtain the ultraviolet detector with high detection performance, and the ultraviolet detector is suitable for the field of ultraviolet detection. The method adopted by the invention has the advantages of simplicity in operation, low cost and high universality, different hollow-structure TiO2 and hedgehog-shaped TiO2 / ZnO heterojunctions such as spherical, cubic and dodecahedron heterojunctions are synthesized, an ultraviolet detector with a self-energy-supply characteristic is further prepared, and the application of a TiO2 nano material in the field of photoelectric detection is expanded.

The invention discloses a B-CN / P-CN homogeneous heterojunction with local electron difference and uniform dispersion as well as a construction method and application thereof, and belongs to the technical field of photocatalytic reaction materials. A simple pre-doping and fused salt assisted two-step calcination method is adopted, firstly, an electron-deficient body (boron) and an electron-rich body (phosphorus) are pre-doped in a precursor respectively, the electronic structure of a carbon nitride intermediate is regulated and controlled, then a KCl / LiCl salt mixture is used as a liquid reaction medium, and a B-CN / P-CN homogeneous heterojunction with local electron difference and uniform dispersion is constructed; additional acceptor impurities and donor impurities are generated through doping of B and P, the electronic structure of carbon nitride is changed, and a built-in electric field is formed at the interface of B-CN and P-CN, so that directional migration of photo-generated carriers and the separation efficiency of photo-generated carrier current are promoted, the photocatalytic performance of the material is greatly improved, and the photocatalytic performance of the material is improved. The prepared RhB photocatalyst has excellent RhB photocatalytic degradation performance under visible light irradiation, the degradation rate can reach 97.5%, the degradation rate constant is 1.5 times that of pure-phase CN, and the RhB photocatalyst has good stability.

The utility model provides a photovoltaic assembly panel and a photovoltaic assembly, and belongs to the technical field of photovoltaic assemblies, a weight reduction cavity is arranged in the panel, and the weight reduction cavity penetrates through two opposite side surfaces of the panel. According to the utility model, the weight reduction cavity is arranged in the panel to reduce the weight of the panel, so that the self weight of the photovoltaic module can be reduced, the problem that the photovoltaic module is bent downwards due to the heavy weight of the panel is avoided, and the power reduction of the module due to the bending of the photovoltaic module can be further avoided; and the problem that the service life is shortened due to hidden crack defects caused by bending is solved. The weight reduction cavity is arranged in the panel, so that the panel has bending resistance, and the bending resistance of the photovoltaic module is enhanced; the weight reduction cavity is formed in the panel, refraction can be generated when sunlight irradiates, the light absorption capacity of the assembly is improved, and therefore the power of the assembly is improved; and the weight reduction cavity is arranged in the panel, so that the transportation cost and the installation difficulty of the photovoltaic module can be reduced.

The invention discloses an oxygen vacancy-enriched WO3-W18O49 composite catalytic material as well as a preparation method and application thereof. According to the technical scheme, ultrapure water is used as a solvent, a tungsten source, sodium chloride and hydrochloric acid are added, and a WO3 nanorod is prepared through a hydrothermal method; and synthesizing an oxygen vacancy-enriched WO3-W18O49 composite photo-thermal catalytic material by using WO3 as a substrate, ethanol as a solvent and tungsten hexachloride as a raw material through an in-situ deposition method. WO3 and W18O49 are combined to form a binary oxygen-rich vacancy heterojunction, the binary oxygen-rich vacancy heterojunction follows a z-type charge transport mechanism, charge separation is facilitated, electrons are kept in a conduction band region of WO3, WO3 nanorods only absorb in ultraviolet and partial visible light regions, the W18O49 exactly complements spectral absorption, the light absorption capacity of the material is improved, and the photoelectric conversion efficiency of the material is improved. Meanwhile, the photo-thermal catalytic performance of the WO3-W18O49 composite material on cyclohexane oxidation is also improved, and the WO3-W18O49 composite material belongs to the technical field of catalysis.

The present invention belongs to the technical field related to the preparation of micro-nano materials, and discloses a method and system for preparing micro-nano materials based on tunable laser-assisted preparation, the method comprising the following steps: (1) providing a precursor substance and a liquid phase solvent, and dispersing the precursor substance in the liquid phase solvent to prepare a suspension; (2) measuring the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity; (3) using a tunable laser beam with a wavelength of the light wave wavelength to irradiate the suspension, thereby obtaining the micro-nano material; wherein, when the tunable laser beam interacts with the suspension, a resonance effect is generated to enhance the light absorption of the suspension. The present invention improves the utilization rate of laser energy, reduces costs, has strong applicability, and good flexibility.

A soilless plant culture system comprises: a container (10) having an enclosed space provided therein, wherein the enclosed space includes a culture region (202) comprising one germination and seedling growth region (2022) and one cultivation and harvest region (2023). The culture region (202) comprises at least one rack system (2022RS), and each rack system (2022RS) is provided with at least one shelf (2022S) to place components capable of accommodating a culture substrate having a plant placed therein.

The application belongs to the technical field of material preparation, and particularly relates to a light-heat material with an antireflection coating and a preparation method thereof. Micron or nanometer magnetic particles are used as the core, and inorganic materials with antireflection function are used as the functional coating to coat the surface of the magnetic particles; wherein the functional coating is metal oxide or non-metal oxide with light reflection inhibiting function. The method is simple in operation, mild in reaction condition, and the prepared material has an antireflection coating, which can reduce the energy loss in the form of diffuse reflection on the surface of the material in the light-heat conversion process, and shows high energy conversion efficiency. In addition, the coating material is stable in chemical property, so that the prepared composite particles have certain oxidation resistance, and can be widely applied in the fields of paint and water treatment chemical industry.

The invention discloses a composite heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out pre-reaction on a first mixed system at least containing an aldehyde substance, an amine substance, a two-dimensional nanosheet and a catalyst, and then heating in a vacuum or inert atmosphere for continuous reaction to prepare the covalent organic framework nanotube / two-dimensional nanosheet composite heterojunction photocatalyst. According to the method, no soft / hard template is used, reversible Schiff base chemical bonds and proton tautomerization are utilized, hollow nanotubes are constructed on the surface of a two-dimensional nanosheet layer material in situ through a one-pot method which is easy to operate from bottom to top, the composite heterojunction photocatalyst is obtained, and meanwhile the composite heterojunction photocatalyst is high in crystallinity and good in photocatalytic performance. And the material has a large specific surface area, and has potential application value in the fields of adsorption, separation and photocatalytic antibiosis and antifouling.

The application relates to the technical field of photovoltaic solar cells, and discloses a solar cell and a photovoltaic module. The solar cell comprises a silicon substrate, the silicon substrate has a first surface and a second surface arranged oppositely, a medium layer arranged on the second surface, and a doped layer arranged on the surface of the medium layer away from the silicon substrate, wherein the surface of the doped layer away from the medium layer has a plurality of submicron particles. In the application, the roughness of the doped layer can be effectively increased through the plurality of submicron particles on the surface of the doped layer away from the medium layer, the back surface reflection of the cell sheet can be reduced through the submicron particles, the light absorption capacity of the film layer can be improved, and the contact area with metal can be increased, so that the doped layer has better metal contact performance.

This invention belongs to the field of hollow multi-component nanomaterial preparation technology, specifically disclosing a hollow Cu3NbSe4 nanomaterial, its preparation method, and its application. The microstructure of the nanomaterial is a nanoscale hollow cubic structure. The preparation method includes: (1) dissolving niobium source and selenium source separately in oleylamine solvent by heating for later use; (2) treating the soluble copper source and the niobium source dissolved in (1) in a high-boiling-point organic solvent for deoxygenation and dehydration, and then carrying out a solvothermal reaction; (3) when (2) is heated to a certain temperature, injecting the selenium source dissolved in (1) to carry out a solvothermal reaction, and separating the obtained solid product after the reaction is completed. The synthesis process of this invention is simple, the reaction conditions are mild, and the energy consumption and cost are low; more importantly, it realizes the preparation of hollow Cu3NbSe4 nanomaterial with uniform morphology and size, high crystallinity, and stronger light absorption capacity, and the prepared hollow Cu3NbSe4 shows excellent performance in photocatalytic hydrogen production.

The present invention provides a method for structural modification and photocatalytic decomposition of hollow nano-tubular carbon nitride to produce hydrogen, which belongs to the technical field of hydrogen energy preparation, and comprises: mixing melamine and aromatic small molecules and performing hydrothermal treatment to obtain a supramolecular precursor; calcining the supramolecular precursor to obtain modified hollow nano-tubular carbon nitride; wherein the molar percentage of the aromatic small molecules to the melamine is a, a≥0; the aromatic small molecules are selected from benzoic acid small molecules or halogen-containing benzoic acid small molecules. The present invention can improve the photocatalytic hydrogen production performance of carbon nitride.

The invention belongs to the technical field of anode material preparation, and particularly relates to a Bi-Bi2S3 (at) C composite material and a preparation method thereof. The method comprises the following steps: dissolving Bi (NO3) 3.5 H2O in an ethylene glycol solution to obtain a solution A, dissolving Na2S. 9H2O in the ethylene glycol solution to obtain a solution B, and dissolving urea in the ethylene glycol solution to obtain a solution C; adding the solution B into the solution A to form a black solution, adding the solution C into the black solution, finally adding glucose, fully mixing to obtain a mixture, transferring the mixture into a reaction kettle, and fully reacting to obtain a reaction product, namely the Bi-Bi2S3-C composite material. The Bi-Bi2S3 (at) C composite material with anode photocurrent response is prepared through double modification of Bi2S3, the composite material has high light absorption performance and photoelectric conversion efficiency, and due to one-pot synthesis, additional modification after synthesis of Bi2S3 is not needed, and high efficiency and convenience are achieved.

The invention belongs to the technical field of hydrogel, and mainly relates to preparation and application of hydrogel with a doughnut structure. The invention aims to solve the problem that the existing seawater desalination material based on hydrogel is insufficient in recyclability. The preparation method comprises the following steps: mixing ZrOCl2. 8H2O and fumaric acid, and performing ultrasonic dispersion on the mixture and a multi-walled carbon nanotube to obtain a pretreated precursor; carrying out hydrothermal treatment on the pretreated precursor, and modifying the pretreated precursor with acryloyl chloride to obtain modified MOF801 (at) CNT; the modified MOF801-coated CNT, polyvinyl alcohol, cassava starch and a cross-linking agent are subjected to thermosensitive cross-linking treatment, and the hydrogel with the doughnut structure is obtained. The hydrogel has high application value in the field of seawater desalination, has self-adjustability of temperature response, is high in evaporation efficiency, can be recycled, and can efficiently desalinate seawater with different temperatures and components.