168results about How to "Increase the rate of electron transfer" patented technology

The invention discloses a method for applying an ionic liquid functionalized graphene modified electrode in concurrent detection of 5-hydroxytryptamine and dopamine, wherein an amine terminated imidazole ionic liquid and the epoxy group of graphene oxide lamellas are subjected to a nucleophilic ring opening reaction to form ionic liquid functionalized graphene, and then the ionic liquid functionalized graphene is modified on a glassy carbon electrode to form a modification layer so as to concurrently detecting 5-hydroxytryptamine and dopamine. According to the present invention, research results show that the ionic liquid functionalized graphene modified electrode provides good electrocatalysis activity for oxidation of 5-hydroxytryptamine and dopamine, and can be provided for individually detecting 5-hydroxytryptamine and dopamine and concurrently detecting 5-hydroxytryptamine and dopamine, and the method has characteristics of simple detection process, high sensitivity, rapidness and convenience.

The invention provides a preparation method of a nano sheet MnO2-graphene composite material, which comprises the following steps: adding a manganese nitrate solution in a mixed solution of hydrogen peroxide and alkaline to perform redox reaction, washing and drying to obtain powder, dispersing the powder in an ammonium persulphate solution to treat, and then dispersing in an organic solvent to obtain a nano sheet MnO2 solution; and diluting the nano sheet MnO2 solution, mixing with a dispersion liquid of graphene powder to obtain the nano sheet MnO2-graphene composite material after ultrasonic treatment. According to the nano sheet MnO2-graphene composite material prepared by the method, the nano sheet MnO2 and the graphene are alternatively arranged and uniformly distributed to guarantee the high conductivity of the graphene, and high specific energy can be obtained. The composite material is used as a super capacitor of the positive electrode to realize high specific capacitance, good charging/discharging capacity and circulating performance, and good combination property.

The invention discloses an inversed organic thin-film solar cell and a manufacturing method of the inversed organic thin-film solar cell. The inversed organic thin-film solar cell structurally and sequentially comprises a substrate, a transparent electric conduction cathode ITO, a cathode buffer layer, an optical activity layer, an anode buffer layer and a metallic cathode from bottom top top. Transparent electric conduction nano-particles are added in the anode buffer layer. The manufacturing method includes the steps of forming a substrate body through the substrate and the transparent electric conduction cathode ITO, washing and drying the base plate, manufacturing the cathode buffer layer on the surface of the transparent electric conduction cathode ITO, manufacturing and baking the optical activity layer on the surface of the cathode buffer layer, manufacturing the anode buffer layer on the surface of the optical activity layer, conducting annealing on the substrate body, and plating the anode buffer layer with the metallic cathode in an evaporation mode. High conductivity and high reflectivity of the transparent electric conduction nano-particles are used, the electron transmission rate and the light reflection rate of a traditional anode buffer layer are strengthened, the absorptivity of the optical activity layer to sunlight is improved, the light current density and the carrier transmission efficiency of the organic thin-film solar cell are accordingly improved, the series resistance of the cell is reduced, and the photoelectric conversion efficiency of a device is improved.

The present invention provides a selenium-rich rice compound fertilizer. The compound fertilizer comprises the following raw materials in parts by weight: 400-600 parts of a nitrogen-phosphorus-potassium fertilizer, 50-70 parts of nitro humic acid, 2-8 parts of organic trace elements, 3-7 parts of inorganic trace elements, 10-20 parts of biomass slag, and 1-2 parts of inorganic selenium salt. The organic trace elements comprise a sucrose sugar complex and a humic acid complex. The selenium-rich rice compound fertilizer provided by the present invention has the advantages that the selenium-rich rice compound fertilizer is high in rice yield, high in plant disease resistance and suitable to be applied in large area; rice ears are relatively large and heavy; and because selenium-rich rice contains selenium that is essential for human bodies and animals, the selenium-rich rice is high in nutritional value and beneficial for health.

The invention discloses a preparation method and an application of a nitrogen-doped carbon fiber/nitrogen-doped graphene/bacterial cellulose membrane material, relates to a preparation method and an application of a membrane material and aims to solve the problem that a flexible electrode material prepared with a conventional method does not have good stability, cycle performance and mechanical properties. The method comprises the following steps: preparing bacterial cellulose pulp; preparing a bacterial cellulose and graphene composite; preparing a polypyrrole coated bacterial cellulose and graphene composite; preparing a nitrogen-doped carbon fiber/nitrogen-doped graphene composite through high-temperature carbonization; preparing a nitrogen-doped carbon fiber/nitrogen-doped graphene dispersing agent; performing vacuum pumping filtration on the bacterial cellulose pulp for membrane forming, adding the dispersing agent for continuous pumping filtration for membrane forming, and performing vacuum drying for finishing. The membrane material has low equipment corrosion, low cost, good cycle performance and good mechanical properties and can realize scale production, and a symmetrical supercapacitor prepared from the membrane material has the good capacitive character. The invention belongs to the technical field of nanomaterials.

The invention discloses a Co-Se compound nanotube@ foam Ni composite array material as well as a preparation method and an application thereof. The method comprises the following steps: firstly, Co salt and urea are dissolved in deionized water, foam Ni is added, and a Co precursor@ foam Ni composite is prepared through a hydrothermal reaction; then a Se source is dissolved in hydrazine hydrate, the obtained solution is mixed with deionized water, the Co precursor@ foam Ni composite is added, and the Co9Se8 nanotube@ foam Ni composite array material is obtained through a hydrothermal reaction.The raw materials and process equipment are simple, the preparation cost is low, the product yield is high, and the prepared composite is a 1D hollow-structured Co9Se8 nanotube array directly growingon a foam Ni substrate with good electrical conductivity, can directly serve as an electrode material to be applied to catalysis of water electrolysis for a hydrogen evolution reaction, shows excellent catalytic performance and has huge potential application value in the field of water electrolysis for hydrogen production.

The invention discloses a graphene (GR)-exfoliation hydrotalcite-like compound (ELDH) composite material immobilized protein modified electrode, a production method and an application thereof. The method comprises the following steps: compounding ELDH with negatively-charged exfoliation graphene oxide (GO) nanosheets through electrostatic attraction by using the characteristics of positive charges and large specific surface area of the ELDH, and reducing by using hydrazine hydrate to prepare a GR-ELDH hybrid; and sequentially immobilizing the GR-ELDH, ferrohemoglobin and chitosan on an ionic liquid modified carbon paste electrode through adopting a dispensing technology to produce the graphene-exfoliation hydrotalcite-like compound composite material immobilized protein modified electrode. The obtained modified electrode has monolayer GR nanosheet and ELDH synergistic effects, and the GR nanosheets increase the conductivity of the ELDH and inhibits the aggregation and accumulation of the ELDH; and the ELDH effectively inhibits the afresh stacking of the GR nanosheets, reduces the interlamellar contact resistance and improves the electron transfer rate of the above composite material, and a constructed CTS/GR-ELDH-Hb composite film-based third-generation trichloroacetic acid sensor has the advantages of low detection limit, wide detection range and small Michaelis constant.

The invention discloses a water electrolysis catalysis material having a palladium-nickel nanometer alloy structure, wherein the water electrolysis catalysis material comprises a catalytic active material and a carrier, the catalytic active material is palladium-nickel alloy nanoparticles, and the carrier is ultrafine carbon fiber. The water electrolysis catalysis material of the present invention has high specific surface area and high porosity, is conducive to the electrolyte diffusion and the gas desorption, and provides the large contact area between the electrolyte and the catalytic site.

The invention discloses a nitrite electrochemical sensor and a manufacturing method thereof. The nitrite electrochemical sensor is used for detecting the concentration of nitrite in a to-be-detected solution and comprises a substrate, wherein an auxiliary electrode, a working electrode, a reference electrode and leads and binding posts of the various electrodes are printed on the substrate by virtue of a silk-screen printing technology; the auxiliary electrode and the working electrode are subjected to carbon paste printing, while the reference electrode, the leads and the binding posts are subjected to silver/silver chloride paste printing; reduced graphene oxide is also deposited on the surface of the working electrode by virtue of an electrochemical graphene oxide reduction method, and a layer of Nafion is dispensed on the upper surface of the reduced graphene oxide. The sensor disclosed by the invention has the advantages of high sensitivity, short response time, good repeatability, low cost, disposability and the like, and has a good application potential in the aspect of on-site rapid detection of the content of nitrite in a to-be-detected sample.

The invention discloses a preparation method of an electrochemical immunosensor used for detection of estradiol and built on the basis of MoS2 composite and belongs to the technical field of novel nano functional materials and sensing detection. A MoS2/iron-palladium alloy nanocomposite MoS2/FePd is prepared with a one-pot method, and then the simple electrochemical immunosensor which can be used for detecting estradiol in an environmental water sample simply, quickly and sensitively is prepared by means of the excellent adsorption and electrochemical catalytic performance of the composite.

The invention discloses a molecularly-imprinted polymer-graphene composite material modified electrode. The molecularly-imprinted polymer-graphene composite material modified electrode comprises a molecularly-imprinted polymer-graphene composite material and a glassy carbon electrode, wherein the glassy carbon electrode is used as a base body; the molecularly-imprinted polymer-graphene composite material is modified on the glassy carbon electrode. The invention further provides a preparation method of the molecularly-imprinted polymer-graphene composite material modified electrode and an application of the molecularly-imprinted polymer-graphene composite material modified electrode to detection of aniline and 4,4'-methylenedianiline (MDA). The molecularly-imprinted polymer-graphene composite material modified electrode has the advantages of high responding speed, good selectivity, high sensitivity and the like and is suitable for rapidly detecting the aniline and the MDA in food safety and environmental sanitation.

The invention discloses a fertilizer special for selenium-rich and chromium-rich dark green wax gourds. The fertilizer is prepared from alternanthera philoxeroides green manure, ammonium carbonate, calcium superphosphate, potassium chloride, a microbial growth regulator, tea seed cake manure, decomposed cow dung, coal ash, carbendazim, an urease inhibitor, octyl mercaptan, sodium borate, kudzu vine powder, organophosphorus bacterium manure, borax, thiram wettable powder, organic microelements, biomass ash, chromium trichloride and inorganic selenium salt. The organic microelements comprise a tartaric acid complex, a saccharose complex and a humic acid complex. The fertilizer special for the selenium-rich and chromium-rich dark green wax gourds has the advantages that the yield of the wax gourds is high, the disease resistance of plants is high, and the fertilizer is suitable for being applied in a large area; besides, the obtained wax gourds are big, heavy and good in quality; the selenium-rich and chromium-rich dark green wax gourds contain selenium and chromium necessary for the human body and animals and are high in nutritive value and good for health.

The invention discloses a metal particle-amorphous diamond composite anode for a fuel cell and a preparation method thereof. In the anode, a doped amorphous diamond film and metal nanoparticles are deposited on a substrate of the anode in sequence from bottom to top, wherein the doped amorphous diamond film contains carbon, hydrogen, oxygen and a current carrier doping agent; the current carrier doping agent is any one of boron, nitrogen or phosphorus; the metal nanoparticles are any one or any more than two alloys of platinum, ruthenium or palladium; and the composite anode comprises the following components in percentage by mass: 58.7 to 77.5 percent of carbon, 0 to 14.0 percent of hydrogen, 6.4 to 15.3 percent of oxygen, 1.7 to 8.5 percent of current carrier doping agent, and 3.2 to 13.4 percent of metal nanoparticles. The metal particle-amorphous diamond composite anode has simple preparation technology, can be used as an anode material of alcohol fuel cells, and has good catalytic capability.

The invention provides a selenium-rich rape planting method. The method includes the steps of soil preparation, seed soaking, germination acceleration, water and fertilizer management, disease and pest prevention, harvesting and the like. The selenium-rich rape planting method has the advantages that nutrients are comprehensive, preparation is convenient, rape growth promotion is obvious, pollution is little, and the method has a certain effect on disease and pest prevention. Leaves of rape planted through the method are thick, fresh and good in quality by means of the cooperation of the proper planting method and a scientific and reasonable fertilizer formula, and the selenium-rich rape contains the selenium element necessary to human bodies and animals and is high in nutrient value and beneficial to health.

The invention discloses a water-based wood coating with antibacterial, anti-fouling, mosquito-repellent and insect-repellent effects, and preparation method thereof. The water-based wood coating comprises, by weight, 24-30 parts of water-based polyacrylate, 7-12 parts of water-based polyurethane, 1.5-2.5 parts of water-based fluorocarbon resin, 0.5-0.8 part of a cosolvent, 3-6 parts of deionized water, 1.0-2.5 parts of silicone oil, 0.1-0.3 part of nanometer zinc oxide, 0.6-1.0 part of multiply modified nanometer titanium dioxide, 0.05-0.15 part of a surfactant and 0.6-1.8 parts of anhydrous ethanol. The water-based wood coating of the invention has good antibacterial, anti-fouling, anti-insect and mosquito-repellent effects; and a paint film formed by the coating also has good adhesion, toughness, water resistance, wear resistance, weather resistance and the like.

The invention discloses a uric acid electrochemical sensor based on an active copper carbon point and an application thereof. The application comprises the following steps: adding a high molecular polymer rich in carboxyl and cupric salt into a reaction container, putting the reaction container in a hydrothermal reaction kettle, performing a reaction for 2-18h at 200-240 DEG C, performing centrifugalization and dialysis and purification to obtain an active copper carbon dot-containing solution; by adopting a three-electrode system, taking a glass carbon electrode as a working electrode, a platinum wire electrode as a counter electrode and a saturated mercurous chloride electrode as a reference electrode, putting the pre-treated glass carbon electrode in the active copper carbon dot-containing solution, and performing scan round at the scanning speed of 50-500mV/s in a potential range of 0-2V by means of an electrodeposition method. Compared with the prior art, the nanomaterial containing the active copper carbon dots not only has a large specific surface area of the carbon dots and a high electron transmission rate, but also a promoting action on the electron transfer rate on a matrix on an electrode interface by active copper and very strong selectivity on uric acid.

The invention relates to a resistor type acetone sensor based on a graphitizing carbonized nitrogen/stannic oxide composite material, a preparation method, and application of the resistor type acetone sensor in detecting acetone, which belong to the technical field of gas sensors. A pair of U-shaped gold electrodes with interdigital structures printed on the upper surface of a ceramic chip are used as signal electrodes, a ruthenium dioxide film printed on the lower surface of the ceramic chip in a tiling way is used as a heating layer, a pair of strip-type gold electrodes printed on the surface of the ruthenium dioxide film are used as heating electrodes, and gas-sensing thin films are coated on the upper surface of the ceramic chip and the surfaces of the U-shaped gold electrodes. Each gas-sensing thin film is the graphitizing carbonized nitrogen/stannic oxide composite material, and has the thickness ranging from 10 to 50mu m; in the graphitizing carbonized nitrogen/stannic oxide composite material, the mass ratio of the graphitizing carbonized nitrogen to the stannic oxide is 1:(0.02 to 43). The sensor has higher response sensitivity, fast response recovery rate and favorable response reversibility, and solves the problem that pure-state metallic oxide responses slowly to the acetone.

The present invention discloses a preparation method of a label-free electrochemical immunosensor for nonyl phenol detection, and belongs to the technical field of novel nanometer function materials and environment detection. According to the present invention, the molybdenum disulfide/gold-palladium alloy nanometer composite material MoS2/AuPd is prepared by using the one-pot method, and then the simple, rapid and sensitive label-free electrochemical immunosensor for nonyl phenol detection in real samples is prepared through the excellent adsorption performance and the excellent electrochemical catalytic performance of the molybdenum disulfide/gold-palladium alloy nanometer composite material MoS2/AuPd.