84results about How to "Increased electron transport capacity" patented technology

The invention discloses a high-nickel positive electrode material with a composite coating layer and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing a high-nickel positive electrode material and a nano-coating material, and carrying out high-temperature sintering, cooling, crushing and sieving in a preheated muffle furnace under an oxygen atmosphere to obtain a nano-material-coated high-nickel positive electrode material; and (2) adding the high-nickel positive electrode material coated with the nano material into deionized water dissolved with a soluble lithium compound, uniformly stirring, slowly adding soluble phosphate, uniformly stirring, carrying out vacuum filtration, drying and re-burning in a kiln, cooling, crushing and sieving to obtain the high-nickel positive electrode material with the composite coating layer. According to the high-nickel positive electrode material with a composite coating layer and the preparationmethod thereof, multi-layer uniform coating of the nano material and phosphate is realized through dry-process and wet-process coating, and the prepared positive electrode material has the advantagesof good cycle performance, good thermal stability and the like, and the preparation process is simple, and the positive electrode material can be used for industrial mass production and has a wide application prospect in lithium ion battery production.

The invention relates to a graphite composite anode material and a preparation method thereof. The graphite composite anode material is of a core-shell structure and comprises an inner core and an outer shell, wherein the inner core is graphite; the outer shell is a nitrogen and phosphorus-doped composite material layer; the nitrogen and phosphorus-doped composite material layer is formed by adding the graphite serving as a raw material into nitrogen-containing ionic liquid in which a phosphorus-containing organic compound, a surfactant and lithium salt are dispersed and sintering; the mass ratio of the phosphorus-containing organic compound to the surfactant to the lithium salt to the nitrogen-containing ionic liquid is (10-50):(1-5):(1-5):200. The graphite composite anode material provided by the invention has the advantages that the transmission rate of lithium ions under the condition of high magnification can be improved, and the compatibility of the graphite composite anode material with an electrolyte can also be improved, so that the cycle performance is improved; the lithium salt in the outer shell can provide sufficient lithium ions, so that the first-time efficiency and the cycle performance are improved.

The invention discloses a modified silica nanoporous membrane modified electrode, a preparation method and an application thereof, and belongs to the technical field of novel materials. The preparation method comprises the following steps of: (1) preparing a silica nanoporous membrane having an open pore structure on an electrode substrate; and (2) inserting graphene quantum dots into pores to modify the silica nanopores to prepare the modified silica nanoporous membrane modified electrode by using a electrophoresis method, an electrostatic adsorption method, or a covalent immobilization method. The modified electrode, the preparation method and the application thereof insert small-sized GQDs as a functional block into pores to modify a VMSF electrode to prepare a variety of sensing interfaces. The electrode can realize a pre-enrichment effect on an object to be detected due to the electronegativity of the pores, and the coordination effect on metal ions and the pi-pi stacking action on the dopamine of the graphene quantum dots, so that the detection property of the object to be detected is remarkably improved. The great application prospects are achieved in direct and high-sensitivity electrochemical detection of multiple types of active compositions in complex samples combined with the anti-staining/anti-interference ability of the VMSF.

The object of the present invention is to provide an organic EL device having a structure that resolves a problem of trade-off between decrease in a drive voltage and increase in production yield. The organic EL device of the present invention includes a substrate, a pair of electrodes provided on the substrate, and an organic EL layer sandwiched by the pair of electrodes; the pair of electrodes includes a positive electrode and a negative electrode; the organic EL layer includes at least a light-emitting layer and a hole injection layer that is in contact with the positive electrode; the hole injection layer is formed of an n-type semiconductor host material and a p-type semiconductor guest material; a LUMO level E_HIC of the host material and a HOMO level of the guest material or a valence band level E_GV satisfy:

|E_HIC|+0.5 eV≧|E_GV|>I_HIC|−0.6 eV.

The invention belongs to the field of heavy metal detection sensor, and especially relates to a screen-printed electrode based on graphene conductive ink and a processing method thereof. The screen-printed electrode comprises a substrate, and a working electrode, a counter electrode, and a conductive lead wire are printed on the substrate. The working electrode electrically communicates with the conductive lead wire by a lead wire, and the counter electrode electrically communicates with the conductive lead wire by the lead wire. The materials of the working electrode, the counter electrode, and the conductive lead wire are graphene conductive ink. The screen-printed electrode uses graphene which has large specific surface area and high electrocatalytic and electrochemical activities as the materials of the working electrode, the counter electrode, the conductive lead wire, and the lead wire, so that the electron transfer performance of the molecule or ion to be detected in an electrode reaction interface is improved. Moreover, the screen-printed electrode prepared form graphene conductive ink is beneficial to the adsorption of the heavy metal ion and the modification of the surface functionalization.

The invention belongs to the technical field of preparation of electrochemical sensors, and relates to a preparation method of a molecularly imprinted sensor based on a carbon quantum dot/a hollow nickel base material composite film modified glassy carbon electrode. The preparation method comprises the following steps of firstly depositing a Ni-Cu alloy layer in a three-electrode system, and thendealloying and removing copper to obtain a nano hollow nickel sphere layer; preparing an environment-friendly carbon quantum dot solution by adopting a biomass material, and modifying a glassy carbonelectrode coated with a nano hollow nickel sphere by using a composite solution of the carbon quantum dot and chitosan; and taking 3-aminophenylboronic acid as a functional monomer, and preparing themolecular imprinted sensor which has specific recognition response to the template molecular glucose on the surface of the glassy carbon electrode modified by a composite film through an electrochemical polymerization method. The preparation method of the molecularly imprinted sensor based on the carbon quantum dot/the hollow nickel base material composite film modified glassy carbon electrode provided by the invention effectively improves the active area and the electron transport performance. Combined with the molecular imprinting technology, the molecularly imprinted sensor with specific recognition response to glucose is prepared, and the molecularly imprinted sensor has the advantages of being simple in operation, low in cost, high in selectivity and sensitivity, and is expected to bepractical.

The present invention relates to an energy saving ethylbenzene dehydrogenation catalyst mainly solves the problems that the low-kalium catalyst in the prior art has poor activity under a low temperature condition. The invention adopts a technical proposal of inducing tellurium dioxide into a Fe-K-Ce-W-Mg system and the reaction temperature of the obtained catalyst is lower than the same catalyst by 5 to 10 DEG C. The present invention can be used for the industrial production of styrene by ethylbenzene dehydrogenation.

The invention belongs to the field of electrode materials and in particular to a method for preparing a titanium oxide coated sulfur-doped carbon nanotube lithium-sulfur battery cathode material. Themethod comprises firstly adding a carbon nanotube into deionized water, performing a dispersing process, adding a sodium sulfide solution, adding a resultant solution to a reaction kettle, performinga thermostatic reaction, centrifugal separation, washing, and vacuum drying to obtain a sulfur-doped carbon nanotube; and finally, adding a solution A composed of concentrated ammonia water, tetraethyl titanate, and a organic solvent to the sulfur-doped carbon nanotube dispersion liquid, performing constant-temperature stirring, centrifugal separation, washing, vacuum drying and calcination to obtain the titanium dioxide coated sulfur-doped carbon nanotube. The method for preparing the titanium dioxide coated sulfur-doped carbon nanotube is easy to operate and low in economic cost and can realize large-scale production. The prepared titanium dioxide coated sulfur-doped carbon nanotube has large specific surface area, high electron transport capacity and first charge and discharge capacity,and excellent cycle performance.

The invention relates to a preparation method of a CNTs/NiFe3O4 functional material, and belongs to the technical field of functional nano composite materials and environmental biology. The preparation method of the CNTs/NiFe3O4 functional material comprises the following specific steps: purifying and activating multiwalled carbon nanotubes; preparing CNTsFe3O4: preparing the CNTs/NiFe3O4 nano composite material. The CNTs/NiFe3O4 functional material prepared by the invention is used as an efficient biological catalytic material and a wave-absorbing material, has the characteristics of promoting oxidation-reduction reaction and electron transfer, is used as a stabilizer and a catalyst in sewage treatment anaerobic digestion reaction, can improve the methane yield and produce biomass energy,can play a role once being added, and has a good application prospect. The catalyst is good in dispersity in a reactor and uniform and consistent in reaction, and can be recycled to save the cost.

The invention relates to an embedded nano iron/ composite microbial agent and a preparation method thereof. The preparation method comprises the steps of firstly using agrobacterium tumefaeiens, enterobacter cloacae, bacillus, gordonia, pseudomonas putida and pseudomonas stutzeri to prepare a nano iron solution B, preparing embedding medium agar, PVA (Polyvinyl Alcohol) and a SiO2 solution C, and preparing a cross-linking agent aluminum sulfate saturated boric acid solution D; according to volume ratio, respectively taking and adding 15-18% of a solution B and 6-15% of thallus A into 57-66% of the solution C, stirring and mixing evenly, dropwise adding the mixture into 1-22% of a solution D at room temperature in a nitrogen protected environment, carrying out crosslinking treatment, rinsing and preserving to obtain the nano iron/ composite microbial agent. The embedded nano iron/ composite microbial agent takes advantage of a synergistic effect between the nano iron and microorganisms to improve the degradation efficiency of triclosan; and the microbial agent prepared is high in strength, small in microbial toxicity and low in raw material source cost, and can be used for treatment of a water body polluted by triclosan.

The invention discloses a method for producing acetic acid by utilizing a self-assembly conductive biological membrane electrode to reduce carbon dioxide. The method comprises the following steps: (1) adding an inhibitor chloromethane into an inoculum, continuously performing biological acclimatization under H2/CO2 atmosphere and continuously shortening the turning time, thereby acquiring the acclimatized self-oxidation microorganism; and (2) taking a carbon felt as an electrode, inoculating the self-oxidation microorganism acquired in the step (1) and the culture medium suitable for microbial growth in the carbon felt, reacting for 5-7 days under H2/CO2 atmosphere, replacing by a new culture medium, reacting for 3-5 days under the same atmosphere, thereby acquiring the conductive biological membrane electrode, and then generating acetic acid by using the conductive biological membrane electrode for performing bioelectrochemical reduction on carbon dioxide. The biological membrane electrode disclosed by the invention is simple in preparation process, is high in catalytic efficiency and is capable of effectively increasing the electron transfer rate of a biological cathode, so that the efficiency of generating acetic acid through the bioelectrochemical reduction of carbon dioxide can be increased.

The invention discloses a nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite positive electrode material and a preparation method thereof, and is applied to the field of lithium ion batteries. The preparation method of the material comprises the following steps: mixing hydrazine hydrate and carbon nanotubes, and then carrying out reflux, suction filtration and freeze drying to prepare nitrogen-doped carbon nanotubes; preparing rare earth metal ion doped lithium iron phosphate by taking lithium hydroxide, ferric phosphate, oxalic acid, glucose and rare earth metal oxide as raw materials; and finally, adding the nitrogen-doped carbon nanotube and the rare earth metal ion-doped lithium iron phosphate into dispersion liquid for dispersion, and performing ball milling to obtain a final product. Compared with the traditional lithium iron phosphate, the nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite positive electrode material prepared by the method has excellent rate charge-discharge performance.

The invention relates to a low steam-to-oil ratio ethylbeneze dehydrogenation catalyst and a preparing method thereof. The low steam-to-oil ethylbeneze dehydronation catalyst mainly solves the problems that in the prior art, a low-potassium catalyst has poor stability and low activity under the condition of a low steam-to-oil ratio. According to the technical scheme, the low steam-to-oil ratio ethylbeneze dehydrogenation catalyst is prepared from, by weight, 66-79% of Fe2O3, 4-9% of K2O, 6-11% of CeO2, 1-5% of WO3, 0.5-5% of BaO, 0.5-8% of Nb2O5 and 0.5-5% of middle rare earth oxide, wherein the middle rare earth oxide is selected from at least one of Eu2O3, Tb2O3 and Ho2O3, the problems in the prior art are favorably solved, and the low steam-to-oil ratio ethylbenzene dehydrogenation catalyst can be used in industrial production of using ethylbenzene dehydrogenation to prepare styrene under the condition of the low steam-to-oil ratio.

The present invention relates to a low water ratio ethylbenzene dehydrogenation catalyst and a preparation method thereof. A purpose of the present invention is mainly to solve the problems of poor stability and low activity of the low potassium catalyst under the low water ratio condition in the prior art. According to the present invention, the low water ratio ethylbenzene dehydrogenation catalyst comprises, by weight, 66-79% of Fe2O3, 4-9% of K2O, 6-11% of CeO2, 1-5% of WO3, 0.5-5% of BaO, 0.5-8% of ZrO2, and 0.5-5% of a medium rare earth oxide, wherein the medium rare earth oxide is at least one selected from Dy2O3, Tb2O3 and Ho2O3; with the technical scheme, the problems in the prior art are well solved; and the dehydrogenation catalyst can be used for the styrene preparation under the low water ratio condition through the ethylbenzene dehydrogenation in the industrial production.

The invention discloses a pomelo peel porous carbon material and a preparation method and application thereof, and relates to electrode materials. The carbon material contains a certain amount of nitrogen elements, the hydrophilicity of an electrode material can be improved, thus the electrode material can form a double-electric-layer capacitance with a water electrolyte well, and the specific capacitance of the electrode material is improved. The preparation method of the carbon material comprises the following steps that (1) pomelo peel is placed in a tube furnace, nitrogen is firstly introduced for 20-40 min, then temperature is raised to 440-460 DEG C at the rate of 1-3 DEG C/min, and cooling is conducted naturally after carbonizing for 1-3 h to obtain carbonized pomelo peel; (2) afterthe carbonized pomelo peel is mixed with KOH according to the mass ratio of 1:(1-4), grinding is conducted, a mixture is placed into the tube furnace, the nitrogen is introduced for 20-40 min, the temperature is raised to 790-810 DEG C at the rate of 1-3 DEG C/min, and cooling is conducted naturally after activating for 1-3 h to obtain activated pomelo peel; and (3) the pH of the activated pomelopeel is adjusted to 10, decompressing, filtering and washing are conducted after centrifuging, and the activated pomelo peel is placed into a blast drying box for drying to obtain the pomelo peel porous carbon material.

The invention discloses a planting method for improving growth and development and fruit quality of tomatoes. The planting method comprises the steps that tomato seedlings are cultivated; LED plant growth lamps are adopted as light sources to be arranged above the tomato seedlings for irradiation, and the light period every day is set to be 12 h illumination/12 h non-illumination or 16 h illumination/8 h non-illumination; when the tomatoes enter the flowering stage, an EDTA-Fe aqueous solution with the concentration of 100-200 [mu] mol.L <-1 > is sprayed to tomato plants, the EDTA-Fe aqueous solution is uniformly sprayed to the front and back surfaces of leaves once a week, and the tomato plants are irrigated with a nutrient solution containing no Fe element once every other month to ensure sufficient nutrients; and after the EDTA-Fe aqueous solution is sprayed for 55-65 days, when 80% of the tomatoes on the tomato plants turn red and peels are slightly soft, spraying of the EDTA-Fe aqueous solution is stopped. According to the planting method for improving growth and development and fruit quality of the tomatoes, the tomato quality improvement effect is optimal by spraying 100 to 150 [mu] mol.L <-1 > EDTA-Fe aqueous solution on the surfaces of the leaves in the photoperiod of 16 h illumination/8 h non-illumination.

The invention discloses a selenium and nitrogen co-doped biochar catalytic material as well as a preparation method and application thereof. High-toxicity selenite is reduced into low-toxicity biological nano-selenium under the biological detoxification action of bacteria (Bacillus megaterium B10 with the preservation number of CGMCC No.15753), then selenium-enriched thalli serve as a carbon source of biochar, a nitrogen source is added, and the novel selenium and nitrogen co-doped biochar catalytic material is prepared with a simple one-step carbonization method. The preparation method of theselenium and nitrogen co-doped biochar provided by the invention is simple, convenient, safe, cheap and easy to control, and can be used for large-scale production. Meanwhile, the reduction effect ofbacteria on high-valence selenium can rapidly achieve detoxification of selenite pollutants, the environment-friendly advantage is achieved, in addition, the biochar can effectively degrade refractory organic matter or pollutants by activating monopersulfate, the removal effect is good, the reaction speed is high, and the application prospect in the field of wastewater remediation is very wide.

The invention belongs to the field of chemical analysis and detection, provides a three-dimensional porous carbon/polythionine compound modified electrode and a production method thereof, and also provides an electrochemical detection method based on the electrode. The three-dimensional porous carbon/polythionine compound modified electrode includes a base electrode, a polythionine coating and a three-dimensional porous carbon coating, the external surface of the base electrode is wrapped with the polythionine coating, and the external surface of the polythionine coating is wrapped with the three-dimensional porous carbon coating to form the three-dimensional porous carbon/polysulfide composite modified electrode. The three-dimensional porous carbon/polythionine compound modified electrodehas good electron transfer ability and can improve the reaction rate of the electrode, the production method has the advantages of simplicity, easiness in implementation, and low cost, and the electrochemical detection method based on the electrode has the advantages of simplicity in operation, good selectivity and high sensitivity.

The invention discloses a method for enhancing the electron transfer capacity of humic acid to promote anaerobic fermentation and acid production of sludge, and belongs to the field of sludge treatment. Humic acid in a sludge hydrolysate is subjected to catalytic reduction through Pd-C/H2, so that the electron transfer capacity of the humic acid is enhanced, the function of the humic acid as an electron intermediate or an anaerobic respiration electron acceptor in a sludge anaerobic fermentation system is enhanced, and by improving electron transfer between a sludge substrate and functional microorganisms, the conversion rate of sludge organic matter is improved. The modified humic acid can increase the yield of volatile fatty acid in the anaerobic fermentation process by 30-50%. According to the method, 100% of the Pd-C catalyst can be recycled, the cost is low, the efficiency is high, the method is a novel method and thought for improving the yield of volatile fatty acid in the anaerobic fermentation process of the sludge, sludge reduction and resource utilization are integrated, and the method has high application value.