33results about How to "Improves light-harvesting capabilities" patented technology

The invention discloses an II-type core-shell structure quantum dot and a preparation method thereof and an application in preparation of a quantum dot-sensitized photoelectrode. The II-type core-shell structure quantum dot comprises a shell layer and a core layer and the component is CdZnTe@CdS; and the molar ratio of an element Cd to an element Zn is (0.15-1.8):1. The invention discloses a novelcore-shell structure quantum dot, and an II-type core-shell structure is obtained under the low-thickness CdS shell layer. The light trapping capacity of the quantum dot-sensitized photoelectrode prepared by using the II-type core-shell structure quantum dot is significantly improved, the injection efficiency of photo-induced electrons is not affected and a quantum dot-sensitized solar cell prepared by using the quantum dot is expected to have more excellent photoelectric conversion efficiency.

The invention discloses TiO2 slurry used in large-area dye-sensitized solar cell preparation by a screen printing technology. The TiO2 slurry comprises TiO2, terpilenol, ethyl cellulose, a leveling agent and ethanol. The mass ratio of the TiO2, the terpilenol, the ethyl cellulose and the leveling agent is 0.5-3: 3-13: 0.3-2:0.1-3; the particle size of the TiO2 is 10-30 nm, wherein if counted by number, the TiO2 with a particle size equal to or more than 10 nm and less than 20 nm accounts for 10% to 25%, the TiO2 with a particle size of 20 nm accounts for 60% to 75%, and the TiO2 with a particle size more than 20 nm and equal to or less than 30 nm accounts for 10% to 20%; the viscosity of the slurry is 2.1*10<5> to 2.5*10<5> mPa.s. The slurry can be printed repeatedly and no cracks are generated; high-temperature sintering enables the slurry to exhibit excellent inter-particle bonding performance and not easy to exfoliate; and therefore, the provided TiO2 slurry and a method for preparing the TiO2 slurry are suitable for large-area dye-sensitized solar cell preparation by using the screen printing technology and have industrial mass production prospects.

The invention discloses a preparation method of a titanium dioxide nanotube for a solar cell, belonging to the technical field of new energy source materials. The preparation method comprises the following steps: mixing rice husk with water, standing for staling so as to obtain staled rice husk, sterilizing, washing and drying the staled rice husk, and sequentially carrying out alkaline washing and acid pickling, so as to obtain preprocessed rice husk; mixing the preprocessed rice husk with water, freezing, grinding, carrying out vacuum drying so as to obtain nano-rice husk fibers, dispersingthe nano-rice husk fibers into a tetrabutyl titanate diluent, slowly dropwise adding an acetic acid solution, after the dropwise adding of the acetic acid solution is finished, proceeding reaction, filtering, washing, and drying, so as to obtain supported nano-fibers; and slowly heating the supported nano-fibers under the protection of inert gas, carrying out thermal insulation reaction, and carrying out annealing, so as to obtain the titanium dioxide nanotube for the solar cell. The titanium dioxide nanotube has the characteristics of high specific surface area and excellent dye adsorption performance and photocatalytic effect.

The invention relates to the field of nanomaterials, in particular to a nanotube array / nanowire composite structure, a preparation method, a quantum dot sensitized composite structure and applications. TiO prepared by this method 2 The photocurrent density of nanotube array / nanowire composite structure is higher than that of single TiO 2 8-fold improvement in nanotubes; CdSe / CdS / TiO after quantum dot sensitization 2 NWs / NTs (CdSe / CdS quantum dots co-sensitized TiO 2 nanotube array / nanowire composite structure) photocurrent density ratio of TiO 2 NWs / NTs improved by 15 times than ordinary TiO 2 NTs increased by 27 times; in addition, the photodegradation rate of methylene blue in this sample reached 99.77% within 120 min, and the degradation rate remained 97.84% after 5 repeated uses. Therefore, it has great application prospects in the fields of solar cells and photocatalytic degradation of organic pollutants.

The invention relates to the technical field of photocatalytic olefin isomerization, specifically the application of oxygen-deficient tungsten trioxide in photocatalytic olefin isomerization and a photocatalytic olefin isomerization method, aiming to solve the problem of existing photocatalytic olefin isomerization However, there are technical problems such as small scope of application of chemical reaction substrates, poor reaction selectivity and low efficiency of solar energy utilization. The following technical scheme is adopted: the application of oxygen-deficient tungsten trioxide as a photocatalyst in photocatalytic olefin isomerization; a method for photocatalytic olefin isomerization, which is characterized in that it includes the following steps in sequence: 1), adding 0.05g- Add 0.25g oxygen-deficient tungsten trioxide and 0.25mmol-1.25mmol olefin into 2.5ml-12.5ml cyclohexane and stir evenly; 2) Under normal pressure, 40°C-70°C reaction conditions, inert gas protection, using 390nm-700nm light irradiation for 6-36h.

The invention relates to a polycrystalline silicon solar cell light absorption enhancement structure, a polycrystalline silicon solar cell and a preparation method thereof. The light absorption enhancement structure includes a polycrystalline silicon textured structure, a dielectric nano film and a dielectric nano ball that are sequentially stacked, wherein the dielectric nano The thin film is located on the textured side of the polysilicon textured structure, and the medium nano ball monolayer is distributed on the surface of the medium nano film. The dielectric nanospheres are not sensitive to the angle of incident light, and can forward-scatter sunlight in a wide spectral range, enhancing the light capture of the battery, and the combination of the dielectric nanospheres and the dielectric nanofilm makes up for the existing There is a disadvantage of weak light-harvesting ability of micron-scale textured structure technology. In addition, the single-layer dielectric nanosphere integration method of the present invention is simple, has good compatibility with the existing polysilicon textured technology, and can effectively improve the efficiency of polysilicon solar cells.

The invention discloses a preparation method of a Cr-doped CaTiO3 yellow ceramic pigment, which comprises the following steps: dissolving butyl titanate into ethanol so as to obtain liquid A; dissolving calcium chloride dihydrate and chromic nitrate into distilled water, and mixing the obtained mixture with ethanol so as to obtain liquid B; stirring and mixing the liquid A and the liquid B, and adding the obtained mixture into an alkaline regulator, so that the pH value of the mixed solution system is 12; further stirring, putting the obtained object into a hydrothermal kettle, and carrying out heat preservation for 1-36h at a temperature of 180-260 DEG C, so that the Cr-doped CaTiO3 yellow ceramic pigment is obtained. In addition, the invention also discloses products prepared by using the preparation method and applications. According to the invention, the properties and use of a CaTiO3 material as a ceramic pigment are developed and expanded, and the CaTiO3 material is prepared in a low cost, which facilitates the promotion of the application and development of CaTiO3 material and ceramic pigment production technologies.

The invention discloses a dendritic polymer, wherein photosensitizers and hydrogenase mimics are respectively linked at periphery and core of the dendritic polymer through covalent linkage, thus, light capturing capacity of compound is improved, electron transfer processes from the photosensitizers to the hydrogenase mimics is facilitated, meanwhile, the core hydrogenase is stabilized and efficiency of catalytic hydrogen production is improved. Moreover, the photosensitizers at periphery of the polymer are distributed closely, the captured optical energy can migrate among the photosensitizers, and thus, utilization rate of optical energy is improved. The invention further discloses a preparation method of the dendritic polymer, the method has simple process and is easy for large-scale preparation, the polymer prepared by the method has very good stability and is convenient to store. In the invention, the dendritic polymer catalyst is used in hydrogen production by visible light catalytic decomposition of water for the first time, during the hydrogen production process, the catalyst has stable properties and efficient performance.

The invention belongs to the technical field of functional nanomaterials, and provides a method for preparing bismuth-doped polymeric carbon nitride nanocomposites containing carbon defects. The preparation steps are as follows: step 1, preparation of ultra-thin PCN nanosheets; step 2, containing Preparation of carbon-deficient bismuth-doped polymeric carbon nitride (Bi / CV‑PCN) nanocomposites. In the present invention, firstly, 2,4,6-triaminopyrimidine is introduced into the CN structure through supramolecular aggregation and ion fusion polycondensation to obtain ultrathin PCN nanosheets, which controls the crystallinity of PCN and enhances visible light absorption. Then, Bi / CV‑PCN nanocomposites were synthesized by a mild and simple one-pot hydrothermal method, and the photoactivity and photoelectrochemical stability of the composites were further improved under the synergistic effect of Bi doping-induced SPR effect and CVs. accelerated charge separation.

The invention discloses organic dye containing calixarene derivative and a preparation method and application thereof. The organic dye has the characteristics of a classical D-pi-A structure in the organic dye, a calixarene framework and a derivative unit of the calixarene framework are introduced to serve as electron donors, and cyanoacetic acid connected with a conjugate bridge group serves as an electron acceptor and is used to prepare dye sensitized solar cells. Dye molecules are introduced to the calixarene derivative unit, thereby prolonging a conjugated chain to absorb absorption spectrum and effectively restraining molecular aggregation caused by the dye absorbed onto TiO2. In addition, the dye molecules contain a plurality of light absorption units so that the light trapping capability can be improved greatly. The organic dye serving as photosensitive dye is used for preparing the dye sensitized solar cells. The organic dye enables the service life of the cells to be prolonged through photo-thermal stability of the calixarene framework.

Rare earth trimesic acid complex / diyttrium trioxide / titanium dioxide composite photoanode and its construction method, the composite photoanode and its construction field of the present invention. The invention aims to solve the technical problem of low photoelectric conversion efficiency of the existing photoanode as a dye-sensitized solar cell. Preparation materials of rare earth trimesic acid complex / yttrium trioxide / titanium dioxide composite photoanode include Ln(BTC) / Y 2 o 3 :Ln 3+ Composite, TiO 2 and FTO conductive glass; construction method: prepare mixed sol; scrape-coat the mixed sol on the surface of FTO glass, calcining, dye, and complete. The preparation of the composite photoanode of the invention is simple and easy to operate, low in cost and low in production risk. The photoelectric conversion efficiency and stability of the battery are improved, which can effectively realize industrial production. The rare earth trimesic acid complex / diyttrium trioxide / titanium dioxide composite photoanode prepared by the invention is used in a photoanode cell.