36results about How to "High charge transfer capability" patented technology

The invention relates to a ZnO photocatalytic material modified with porous carbon and a preparing method thereof. The ZnO photocatalytic material modified with porous carbon includes zinc oxide nanometer particles and amorphous porous nanometer carbon. The zinc oxide nanometer particles are covered with the amorphous porous nanometer carbon largely or the amorphous porous nanometer carbon is doped in gaps among the zinc oxide nanometer particles largely. The method has characteristics of a simple preparing process, mild reaction conditions, easy control, and the like. The material has a high specific surface area, high CO2 adsorptivity, visible-light response and charge transfer capabilities, effectively overcomes disadvantages which are a small specific surface area, a high photo-induced electron hole pair recombination rate and a low photocatalytic efficiency of a single zinc oxide photocatalyst, greatly increases the solar energy utilization efficiency, and has a wide application prospect in the fields of photocatalysis, electrochemistry, energy, environment, and the like.

A cochlear stimulation device comprising an electrode array designed to provide enhanced charge injection capacity necessary for neural stimulation. The electrode array comprises electrodes with high surface area or a fractal geometry and correspondingly high electrode capacitance and low electrical impedance. The resultant electrodes have a robust surface and sufficient mechanical strength to withstand physical stress vital for long term stability. The device further comprises wire traces having a multilayer structure which provides a reduced width for the conducting part of the electrode array. The cochlear prosthesis is attached by a grommet to the cochleostomy that is made from a single piece of biocompatible polymer. The device, designed to achieve optimum neural stimulation by appropriate electrode design, is a significant improvement over commercially available hand-built devices.

The invention relates to the technical field of electrocatalysis, and discloses a monatomic iron-sulfur-nitrogen co-doped carbon aerogel electrocatalyst and a preparation method and application thereof. Iron in the carbon aerogel electrocatalyst is dispersed in sulfur-nitrogen co-doped carbon aerogel in a monatomic form, and the content of iron atoms in the electrocatalyst is 0.1-1wt%, the contentof sulfur atoms is 2-6wt%, and the content of nitrogen atoms is 2-10wt%; the specific surface area of the carbon aerogel electrocatalyst is 150-500 m < 2 > g <-1 >, the pore volume is 0.01-0.1 cm < 3> g <-1 >, and the pore size is 2-10 nm. Urea is dissolved, and then carrageenan and ferric nitrate are added until carrageenan and ferric nitrate are completely dissolved; the aerogel formed by freeze drying of the obtained mixed solution is calcined and subjected to acid treatment to obtain the electrocatalyst, and the electrocatalyst can be used for catalyzing nitrogen to be reduced into ammonia and zinc-nitrogen batteries and has the advantages of being high in catalytic activity, simple in preparation method, easy to operate and low in cost.

The invention discloses a NiCo2O4 nano flower-like composite material (NiCo2O4-NF). The composite material is a flower-like structural material with loose NiCo2O4 nanosheets uniformly distributed at the surface. A cell assembled by using the composite material as a counter electrode exhibits superior photoelectric conversion performance: under the same conditions, photoelectric conversion efficiency of the dye-sensitized solar cell containing the NiCo2O4-NF counter electrode material is as high as 7.90% and is higher than that of 7.45% of a conventional cell containing commonly-used counter electrode noble metal platinum (Pt); and in addition, the NiCo2O4-NF exhibits better faradaic pseudocapacitance performance when used as an active electrode material: the specific capacitance reaches 817.5 F*g<-1>. The composite material provided by the invention is prepared by the one-step hydrothermal method, and has a simple preparation process, a low price and no pollution, can replace the Pt asa counter electrode to be used in the dye-sensitized solar cell and be used as an excellent active electrode to be used for supercapacitors, and has great application prospects in terms of energy storage.

The invention discloses a starburst non-fullerene organic small molecule receptor material containing pyrene and perylene diimide and a preparation method of the starburst non-fullerene organic smallmolecule receptor material. The non-fullerene organic small molecule receptor material is bridged with condensed nucleus pyrene and perylene bisimide units through triple bonds, the obtained materialhas good thermal stability, raw materials are common and easy to obtain and can be purified through recrystallization, and the production cost is low; and the starburst non-fullerene organic small molecule receptor material is applied to a polymer solar cell, the effect with the energy conversion efficiency being 6-8% can be achieved under the condition of an optimizing device, the starburst non-fullerene organic small molecule receptor material serves as a third component to be added into a ternary solar cell active layer, the density of a short-circuit current of the ternary solar cell active layer can be remarkably increased, the effect with the energy conversion efficiency being 8-11% can be achieved, and certain practical application value is achieved.

The invention discloses a high efficiency organic small molecule receptor material, a preparation method and application thereof. The method includes: taking 2, 7-dibromobenzo[b]benzo[4, 5]thieno[2, 3-d]thiophene (BTBT) and difluoro-indandione as the raw materials, carrying out Suzuki-Miyaura coupling reaction, Friedel-Crafts reaction, Vilsmeier-Haack reaction and Knoevenagel condensation reaction to synthesize A-D-A type organic small molecule receptor material shown as formula (I). The obtained material can be purified by recrystallization and has good thermal stability. By applying the material to polymer solar cells, under the condition of optimizing devices, 12.66% energy conversion efficiency can be acquired, and the material has certain practical application value.

The invention relates to the technical field of nano catalytic materials, and discloses a two-dimensional nickel telluride supported palladium monatomic catalyst and a preparation method and application thereof.The catalyst takes a two-dimensional nickel telluride nanosheet as a carrier and loads palladium monatomic; wherein the thickness n of the two-dimensional nickel telluride nanosheet is greater than 0 nm and less than or equal to 5 nm, and the loading capacity of palladium single atoms is 0.1-0.5 wt%. The preparation method comprises the following steps: by taking nickel nitrate, urea and ammonium fluoride as raw materials, preparing Ni(OH)2 by a hydrothermal method; carrying out telluridation reaction on the two-dimensional nickel telluride nanosheet, sodium tellurite and hydrazinehydrate in a solvent to obtain a two-dimensional nickel telluride nanosheet; impregnating the two-dimensional nickel telluride nanosheet in a palladium salt solution, and then carrying out annealing and acid pickling to produce the catalyst. The catalyst not only can prevent Pd monogen from being agglomerated and falling off, but also can further improve the oxygen adsorption and product dissociation capacity of the catalyst, so that the electrocatalytic activity is improved.

The invention discloses a manganese phosphate lithium/lithium vanadium fluorophosphate/carbon composite anode material and a preparation method thereof, and aims to improve the ion eclectic conductivity and the circulation stability of manganese phosphate lithium and thus overcome defects that a manganese phosphate lithium anode material is poor in rate capability and poor in circulation stability. The composite material disclosed by the invention has a nominal molecular formula of (1-x)LiMnPO4*xLiVPO4F/C, and in the formula, x is greater than 0 and less than or equal to 0.3. The synthetic composite material has primary particles of 60-100nm in size, and the surfaces of the particles are coated by a layer of a uniform carbon source. The preparation method disclosed by the invention is simple in process and easy to control, and due to synergetic functions of the components, the prepared (1-x)LiMnPO4*xLiVPO4F/C composite anode material has the characteristics of being high in energy density, stable in circulation and good in rate capability.

The invention discloses a preparation method and application of a bifunctional electrocatalyst, and belongs to the technical field of electrocatalytic materials. According to the technical scheme, the preparation method is characterized in that an MOF precursor is introduced into a high-conductivity one-dimensional carrier shell layer in situ and then is stably compounded with a metal current collector, then electrochemical in-situ activation is carried out, and finally the OER/HER bifunctional electrocatalyst is prepared. The nano bifunctional electrocatalyst prepared by the invention has a multi-stage assembly structure and a multi-dimensional material composite structure characteristic, is beneficial to improving the electrocatalytic activity of the bifunctional electrocatalyst OER/HER and prolonging the service life of the bifunctional electrocatalyst OER/HER, and has a relatively good application prospect in catalysis of water splitting.

The invention provides an organic electroluminescent material, a preparation method and applications thereof, wherein the organic electroluminescent material has a structure represented by the following formula I. According to the invention, the organic electroluminescent material has high charge transfer capability and high glass-transition temperature, and can prevent crystallization; and with the application of the organic electroluminescent material in OLED devices, the OLED device can have high efficiency, long service life, low driving voltage and wide application prospect.

The present invention provides an organic light emitting material and an OLED device comprising the same, wherein the organic light emitting material has a structure represented by the following formula I. According to the invention, the organic light emitting material has high stability, high charge transfer ability and high glass transition temperature, and is suitable for being used as an electron transport layer main body material of an OLED device and emits green fluorescence, so that the OLED device obtains high efficiency (more than 76 Cd/A), long service life (LT95 is more than 130 hours) and low driving voltage (less than 4.3 V).

The invention provides a compound and application thereof, the compound has a structure as shown in formula I. The compound can be used as an electron transport material, and has high stability, high charge transfer capability and high glass transition temperature. And when the compound is applied to an organic electroluminescent device, relatively high luminous efficiency, relatively low driving voltage and relatively long service life can be obtained.

The invention discloses a preparation method of a nano cobalt hexacyanocobaltate/nitrogen-doped porous carbon composite material. By taking biological protein rich in natural resources as a raw material, taking a strong alkali solution as a medium, taking tris(2-hydroxyethyl)isocyanurate (THEIC) as a cyano providing source and taking cobalt salt as a raw material, the nano Co3[Co(CN)6]2/nitrogen-doped porous carbon composite material is prepared through one-step high-temperature pyrolysis of a precursor mixture. Compared with a traditional solution chemical compounding method, the method has the advantages that the binding force between two components in the composite material is enhanced, and meanwhile, the charge transfer capacity between the two components is improved; in addition, biological protein is protein rich in nitrogen element, and a self-doped nitrogen-doped porous carbon material is formed after carbonization, so the wettability of the material in an aqueous electrolyte is improved, Co3[Co(CN)6]2 particles are uniformly embedded in nitrogen-doped porous carbon with a high specific surface area in a nanocrystallization manner, and the conductivity and the reaction rate of the material are greatly improved in the charging and discharging process.

The invention relates to a compound for organic luminescence, the structure of the compound is shown as a formula (I): wherein R1-R5 are respectively and independently selected from hydrogen, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and a substituted or unsubstituted alkyl group; l is selected from substituted or unsubstituted phenyl and substituted or unsubstituted heteroaryl. The compound for organic light emission can be used as an electron transport material, and not only has high stability, but also has high charge transfer capability and high glass transition temperature.