50results about How to "Fast electron transfer" patented technology

The invention relates to a universal preparation method for an active site-electrode structure integrated air electrode. The universal preparation method is characterized in that various polymer microspheres having open internally-communicating hierarchical-pore structures are conjugated with active sites like noble metal groups, transition metal groups, and hetero atom-doped carbon groups in virtue of different treatment methods; the different treatment methods may be one or more selected from the group consisting of a carbon tetrachloride cross-linking method, a concentrated-sulfuric-acid sulfonation method, a carbon dioxide gas activation method, a dopamine coating method, an ammonia gas activation method, a polyaniline coating method, an in-situ precious-metal loading method, an in-situ transition metallide growth method and an in-situ heteroatom doping method. The universal method described in the invention can flexibly conjugate open internally-communicating hierarchical-pore electrode structures containing super-macro pores, macro pores, meso pores and micropores with a plurality of different highly-active catalytic sites by using appropriate methods, so the catalytic performance of the air electrode and the overall performance of a fuel cell and a metal-air battery are improved.

An enzyme electrode comprises a conductive member and an enzyme, wherein a first mediator and a second mediator are immobilized by a carrier onto the conductive member, the first mediator and the second mediator having different redox potentials (reduction-oxidation potentials). A sensor employs the enzyme electrode as a detection portion for detecting a substance. A fuel cell employs the enzyme electrode as at least one of anode and a cathode. An electrochemical reactor employs the enzyme electrode as a reaction electrode.

The invention belongs to the field of sensors, and particularly relates to a three-dimensional porous structure C@NiCo2O4@PPy composite material and a preparation method and application thereof. The preparation method comprises the steps that 1) nickel salt, cobalt salt and a reducing agent are hydrothermally synthesized into a NiCo LDH nano array; 2) the NiCo-containing LDH nano array and 2-methylimidazole are synthesized into NiCo LDH@ZIF-67, and NiCo LDH@ZIF-67 undergoes high temperature heat treatment to acquire a three-dimensional C@NiCo2O4 material; and 3) the C@NiCo2O4 material and a pyrrole monomer are added into a FeCl3 solution to polymerize the C@NiCo2O4@PPy material. According to the invention, the double metal oxide synergistic action, a three-dimensional porous structure andthe advantages of a conductive polymer are integrated, so that the material has a higher catalytic performance; and the material has the advantages of high sensitivity, wide linear range, good stability and the like for glucose detection.

The invention provides a nickel-based nickel titanium hydrotalcite film material, a preparation method and application of the nickel-based nickel titanium hydrotalcite film material. The material can be used as a super capacitance material and an electric adsorption material; the nickel-based nickel titanium hydrotalcite film material takes foam nickel as a base material, and a nickel-titanium hydrotalcite film grows in situ on the surface. The film has the advantages of complete crystal shape, uniform density, and high adhesive force, and does not easily fall off. The preparation method comprises the steps of: placing a foam nickel sheet into mixed solution of nickel nitrate and titanous sulfate, and planting the nickel-titanium hydrotalcite film in situ on the foam nickel sheet by controlling the reaction conditions such as pH, a reaction temperature and time. A nickel source disclosed by the nickel-based nickel titanium hydrotalcite film material is from the foam nickel surface and nickel salt dissolved into a solution. Compared with a pure hydrotalcite film deposited on a substrate, the prepared film is stronger in adhesive force on a base body, and the material has a better super capacitive property and an electric adsorption performance, and can be used as a super capacitance electrode material and an electric adsorption electrode material.

A titanium oxide nano tube material is configured so that crystal grains of a nano tube has a crystal structure oriented with the [001] direction of a tetragonal crystal system as a preferred direction. FWHM (Full Width at Half Maximum) of a rocking curve with respect to the (004) plane peak is 11.1 degrees to 20.3 degrees. The titanium oxide nano tube material has excellent photoelectric characteristics since the crystal grains of the nano tube are oriented with the (004) plane or the [001] direction of a tetragonal crystal system as a preferred direction.

The invention belongs to the technical field of preparation of electrochemical energy storage materials, and particularly relates to a nickel-base basic nickle carbonate thin-film material as well as a preparation method and an application thereof. The nickel-base basic nickle carbonate thin-film material adopts foamed nickel as a substrate, and in-situ growth of a basic nickel carbonate crystal is implemented on the surface of the substrate, wherein the chemical formula of the basic nickel carbonate is represented as Ni2(OH)2CO3.4H2O; the nickel-base basic nickel carbonate is integral in crystal form and uniform in granularity distribution. The preparation method comprises the following steps of: placing a foamed nickel sheet in a nickel nitride solution, and modulating an aqueous solution and controlling pH, reacting temperature and a reacting duration, so as to realize the in-situ growth of a basic nickel carbonate crystal on the foamed nickel sheet. The nickel source of the basic nickel carbonate thin film growing on the foamed nickel sheet through an in-situ growth method is derived from the substrate surface and the solution, and in comparison with a thin film obtained through simple deposition on the substrate, the thin film is closely bonded with the substrate, stronger in adhesion and difficult to fall.

The invention discloses a graphene array based carbon and sulfur composited anode. The anode is composited by a graphene array, titanium dioxide and sulfur and has huge specific surface area and excellent electric conductivity, wherein the graphene array is vertically grown on a conductive substrate material and forms a three-dimensional network conductive frame, the active material sulfur is uniformly loaded on the surface and in holes of the conductive frame, and an outer layer is coated with titanium dioxide. Therefore, a prepared secondary aluminum battery has higher specific capacity and good cycle performance, the preparation procedure is simple, and the composited anode is suitable for industrial production.

The invention belongs to the technical field of energy material preparation, and particularly relates to a composite electrode material and a preparation method and application thereof. According to the preparation method, the porous Ni-MOF / NF is prepared on the foamed nickel by taking Ni(NO3)2.6H2O and 2MI as raw materials, and the Ni-MOF has excellent mechanical properties, a staggered conductive network and rapid electron transmission. The prepared Ni-MOF / NF is put into an N-GQDs solution to be soaked, the N-GQDs have high conductivity, due to the fact that a large number of nitrogen functional groups are doped, the wettability of electrolyte is improved, and after gallium ions are added for etching, the high-performance NiGa-LDHs / N-GQDs / NF composite electrode material is prepared. The reaction of electrolyte ions and an active material is facilitated, the impedance of the material is reduced, and the cycling stability is improved. The asymmetric supercapacitor assembled by using the material as a positive electrode material has ultrahigh power density and energy density, and an effective way is provided for constructing a novel electrode material with high energy storage density, good cycle performance and good power density.

The invention relates to a method for preparing a three-dimensional layered Ti-Fe alloy oxide photonic crystal electrode (Ti-Fe-O NTPC) with a high periodicity. The photonic crystal electrode is prepared by using ferrotitanium as a substrate and using a three-step electrochemical anodizing method. Compared with a conventional nanotube structure and a layered titanium dioxide nanotube without doped ferrum, the Ti-Fe-O NTPC novel electrode has high-efficient visible photoelectrocatalysis performance because the Ti-Fe-O NTPC has a high-periodicity ordered nanometer net which can be used as photonic crystal layer to increase light absorption and the use of the alloy substrate guarantees uniform doping of Fe and Ti at an atom level so as to promote electron transmission. The electrode has potential application value in the field of photocatalysis, photoelectrocatalysis, and new energy preparation and analysis detection.

The invention discloses a preparation method of a graphene / helical carbon fiber / epoxy resin composite material, which comprises of: loading a catalyst in three-dimensional foam to obtain a loaded catalyst; putting the loaded catalyst into a reaction container, introducing inert gas into the reaction container, then introducing carbon source gas, heating to a temperature at which the carbon source gas is decomposed, keeping the temperature for 20-60 minutes, then introducing inert gas to replace the redundant carbon source gas, and cooling to obtain helical carbon fibers; dispersing graphene or graphene oxide in water to obtain a turbid liquid, immersing helical carbon fibers in the turbid liquid, drying, heating the dried solid to 900-1200 DEG C, and carrying out heat preservation for 1-6 hours to obtain graphene / helical carbon fibers; and adding the graphene / helical carbon fibers into epoxy resin, raising the temperature to 90-130 DEG C, vacuumizing, raising the temperature to 140-180 DEG C, and curing for 3-10 hours to obtain a graphene / helical carbon fiber / epoxy resin composite material. The composite material prepared by the invention has excellent mechanical properties and conductivity.

The invention provides a Ti3C2Tx-TiO2 nanotube array self-supporting film electrode material as well as a preparation method and application thereof, and belongs to the field of nano materials. The preparation method comprises the following steps: carrying out etching, cleaning, stripping and centrifuging on Ti3AlC2 to obtain a few-layer Ti3C2Tx aqueous dispersion; carrying out vacuum suction filtration on the Ti3C2Tx aqueous dispersion, and drying to obtain a Ti3C2Tx self-supporting film; and allowing the Ti3C2Tx self-supporting thin film to react in hot alkali liquor and rotate at a certain rotating speed, and cleaning and drying to obtain the Ti3C2Tx-TiO2 nanotube array self-supporting thin film. According to the prepared Ti3C2Tx-TiO2 nanotube array self-supporting thin film electrode structure, few crystal defects of the Ti3C2Tx-TiO2 nanotube structure and the array structure are beneficial to electron transmission, a large number of active sites exposed out of the nanotube array are beneficial to adsorption of ions or target pollutants, the mechanical performance is high, and the material can be directly used as an electrode material in the fields of supercapacitors, capacitive deionization, batteries, electro-adsorption and the like.

Composition comprising at least one graphene material and at least one metal. The metal can be in the form of nano particles as well as microflakes, including single crystal microflakes. The metal can be intercalated in the graphene sheets. The composition has high conductivity and flexibility. The composition can be made by a one-pot synthesis in which a graphene material precursor is converted to the graphene material, and the metal precursor is converted to the metal. A reducing solvent or dispersant such as NMP can be used. Devices made from the composition include a pressure sensor which has high sensitivity. Two two-dimension materials can be combined to form a hybrid material.

The invention discloses a method for detecting luteolin by combining solid-phase extraction and an electrochemical sensor, and belongs to the technical field of analytical chemistry. According to themethod, ZrO2 nanoparticle and chitosan doped graphene aerogel modified silica gel is used as a solid phase extraction column of an extraction material to extract luteolin in a to-be-detected sample, and ZrO2 nanoparticle and chitosan doped graphene aerogel modified glassy carbon electrode is used as an electrochemical sensor platform to detect the luteolin in the extract liquor. According to the invention, the ZrO2 nanoparticle and chitosan doped graphene aerogel is used as electrode materials, and the ZrO2 nanoparticle and chitosan doped graphene aerogel modified silica gel is used as the extraction material, so that the adsorption selectivity is high, and detection signal amplification is realized; the preparation method is simple and easy to implement and relatively low in cost; and thesolid-phase extraction and the electrochemical sensor are combined, so that the interference of a sample matrix is avoided, the detection sensitivity and accuracy of the method are improved, and theoperation is simple.

The invention discloses an array type detector, which is characterized by comprising a detection module arranged in an array type, the detection module comprises: M*N pixel units, wherein M and N are integers greater than 2, and each pixel comprises a photodiode unit which is used for acquiring a return light signal and converting the return light signal into photo-generated charge; transfer elements, which are used for transferring the photo-generated charges generated in the photodiode; and a charge storage unit, which is used for receiving the photo-generated charge transferred by the transfer element; at least part of the pixel units share at least part of the transfer elements, and by sharing at least part of the transfer elements, the area occupied when the transfer elements are not shared originally can be reduced.

The invention relates to a surface graphene graphite-based carbon material and a preparation method and application thereof. The preparation method includes stripping graphite on the surface layer ofthe graphite-based carbon material as graphene by adopting an electrochemical stripping method to prepare the graphite-based carbon material with graphene attached to the surface; the finally preparedsurface graphene graphite-based carbon material is mainly formed by a graphite-based carbon material and graphene attached to the surface thereof, and the graphite-based carbon material and the graphene are combined through an intermolecular acting force; and the application of the prepared surface graphene graphite-based carbon material includes fabrication of electrochemical sensors by regarding the surface graphene graphite-based carbon material as an operating electrode for detection of small molecules with electroactivity. According to the surface graphene graphite-based carbon material,the preparation method is simple and feasible, the application range is wide, and the electrochemical sensor prepared by the surface graphene graphite-based carbon material is advantaged by high sensitivity, low limit of detection and high detection recovery rate.

The invention relates to a preparation method of a poly(3,4-ethylenedioxythiophene) / self-doped defect-rich tin oxide nano composite photocatalytic material. A self-doped defect-rich tin oxide heterojunction material is loaded and dispersed on PETOT in a chemical bond complexing form to obtain the nano composite material; and the self-doped defect-rich tin oxide is selected from defect-rich tin oxide SnO2-x consisting of Sn-doped nonstoichiometric or mixed valent tin oxides. The electron-hole separation can be facilitated by utilizing the visible light responsive oxidation and reduction capacity of the self-doped defect-rich tin oxide heterojunction material, conductivity and hole transport capacity of PETOT as well as the chemical bonding heterojunction structure among different components, so that the excellent photocatalytic performance can be achieved. Meanwhile, the easy-to-mold characteristic of polypyrrole can effectively avoid the recycling difficulty of the powder material, sothat the poly(3,4-ethylenedioxythiophene) / self-doped defect-rich tin oxide heterojunction nano composite material is a novel environment-friendly photocatalytic material convenient to recycle.

The invention discloses a preparation method of a through-hole type lithium battery negative electrode material, belonging to the technical field of new energy materials. At first, that gelatin is dissolve in glycerol, then titanate and silicate are added, aft heating and stirring reaction for 3-5h, the gelatin is concentrated unde reduced pressure, the residual glycerol is removed, and the gelatin is cooled to obtain a refined concentrate; 3 to 5 hour after that refine concentrate and the sulfuric acid solution are mixed, the hydrothermal reaction is carried out, the material is discharged, is and dried to obtain a hydrothermal carbonized material. Then the hydrothermal carbonized material is dispersed in water, nanometer magnesium powder, nanometer iron powder and sodium fluoride are added, and after ultrasonic impregnation, the hydrothermal carbonized material is filtered and dried to obtain the impregnated hydrothermal carbonized material. The impregnated hydrothermal carbonized material is transferred into a vacuum furnace, the temperature is programmed to be 1480-1500 DEG C, the reaction temperature is preserved and vacuum reacted, then the material is cooled, discharged, washed with dilute hydrochloric acid, washed with water and dried to obtain a through-hole type lithium battery negative electrode material. The through-hole type lithium battery negative electrode material obtained by the invention has excellent cycle performance.

A method for manufacturing membrane layers of organic solar cells by roll to roll coating utilizes a roll to roll process for manufacturing an electron transferring layer and an active layer of the organic solar cells is disclosed. The roll to roll process adopted by the method cooperates with a particular solvent and accompanies a parameter control such as temperature and processing time during the sintering and baking steps. The method utilizes a slot-die coating technique in the interim, whereby a membrane layer of the solar cells can be manufactured with a large area for reducing the cost, and the formed membrane layers can have a good efficiency.

The invention discloses a preparing method for a diphenhydramine molecularly imprinted electrochemical sensor. A diphenhydramine molecularly imprinted electrochemical sensor with high-sensitivity anddrop-resistant doped zinc-nickel layered powder composite materials can be prepared by taking the diphenhydramine as a template molecule, taking the pachymic acid as a functional monomer, taking the azobisisobutyronitrile as an initiator, taking the zinc-nickel layered powder composite material as a dopant, taking the 4-cyclohexyloxy-4'-cyanobiphenyl as a sensing membrane modifier, and taking theoleuropein as a crosslinking agent. The analyzing method is simple and practical, and the defects that the prior analyzing method is complex, the equipment is expensive, and the sensitivity is low areovercome.

A method for manufacturing membrane layers of organic solar cells by roll to roll coating utilizes a roll to roll process for manufacturing an electron transferring layer and an active layer of the organic solar cells is disclosed. The roll to roll process adopted by the method cooperates with a particular solvent and accompanies a parameter control such as temperature and processing time during the sintering and baking steps. The method utilizes a slot-die coating technique in the interim, whereby a membrane layer of the solar cells can be manufactured with a large area for reducing the cost, and the formed membrane layers can have a good efficiency.

The invention provides a nickel-based nickel titanium hydrotalcite film material, a preparation method and application of the nickel-based nickel titanium hydrotalcite film material. The material can be used as a super capacitance material and an electric adsorption material; the nickel-based nickel titanium hydrotalcite film material takes foam nickel as a base material, and a nickel-titanium hydrotalcite film grows in situ on the surface. The film has the advantages of complete crystal shape, uniform density, and high adhesive force, and does not easily fall off. The preparation method comprises the steps of: placing a foam nickel sheet into mixed solution of nickel nitrate and titanous sulfate, and planting the nickel-titanium hydrotalcite film in situ on the foam nickel sheet by controlling the reaction conditions such as pH, a reaction temperature and time. A nickel source disclosed by the nickel-based nickel titanium hydrotalcite film material is from the foam nickel surface and nickel salt dissolved into a solution. Compared with a pure hydrotalcite film deposited on a substrate, the prepared film is stronger in adhesive force on a base body, and the material has a better super capacitive property and an electric adsorption performance, and can be used as a super capacitance electrode material and an electric adsorption electrode material.

The invention belongs to the technical field of electrochemical sensor preparation, and particularly relates to a beta-cyclodextrin / magnetic nanoparticle / GO electrochemical sensor, which is prepared by adhering a beta-cyclodextrin / magnetic nanoparticle / GO composite material to an electrode plate to prepare a modified electrode, and taking the modified electrode as a working electrode, a saturatedcalomel electrode as a reference electrode and a platinum sheet electrode as an auxiliary electrode to form an electrochemical sensor whch is used for detecting the content of serotonin; The beta cyclodextrin / magnetic nanoparticle / GO electrochemical sensor prepared by the method has the characteristics of large specific surface area, fast electron transfer, strong catalytic ability, good dispersibility and the like.

The invention discloses a gold-platinum co-modified graphene electrode and its preparation method and application. The preparation method of the gold-platinum co-modified graphene electrode comprises the following steps: cleaning the glassy carbon sheet, and putting the glassy carbon sheet into a DC plasma chemical gas phase Vacuumize the sample chamber of the deposition equipment, fill the sample chamber with inert gas and hydrogen, spray methane into the sample chamber after heating up, end the DC plasma chemical vapor deposition, and use the graphene glassy carbon sheet as the working Electrode, the three-electrode system that working electrode, counter electrode and reference electrode constitute is inserted in electrolyte, connect electrochemical workstation, adopt multi-potential step method to electrochemically reduce and deposit gold on the surface of described graphene glassy carbon sheet Platinum nanoparticles, the deposition time is 1 to 5 minutes, and after cleaning, a gold-platinum co-modified graphene electrode is obtained. The quantitative detection of tumor markers using the gold-platinum co-modified graphene electrode of the present invention has the characteristics of miniaturization, semi-automatic, high accuracy and the like.

The invention relates to a preparation and application method of a long-life friction-sensitive graphdiyne-based piezoelectric material, in particular to application of the long-life friction-sensitive graphdiyne-based piezoelectric material in the fields of interface catalytic reaction and water quality purification, and belongs to the technical field of preparation and application of novel functional materials. A novel graphdiyne material with the high piezoelectric response is mainly used as a structure regulating agent, a piezoelectric material is induced to grow on the edge of the graphdiyne material in an oriented mode in situ, active defects are formed, separation of electrons and holes is accelerated, and the piezoelectric catalytic performance of the composite material is remarkably improved. Meanwhile, the material is synthesized by a mechanochemical method and the size and the layer thickness of the material are regulated and controlled, so that the friction sensitivity of the composite piezoelectric catalytic material is improved, the mechanical stability of the composite piezoelectric catalytic material is enhanced, and the dual goals of high piezoelectric activity andlong service life are achieved. Under the condition that an in-situ ball milling method provides a mechanical force, organic pollutants in water can be efficiently and sustainably oxidized and degraded through a piezoelectric catalytic reaction.

The invention belongs to the technical field of preparation of electrochemical energy storage materials, and particularly relates to a nickel-base basic nickle carbonate thin-film material as well as a preparation method and an application thereof. The nickel-base basic nickle carbonate thin-film material adopts foamed nickel as a substrate, and in-situ growth of a basic nickel carbonate crystal is implemented on the surface of the substrate, wherein the chemical formula of the basic nickel carbonate is represented as Ni2(OH)2CO3.4H2O; the nickel-base basic nickel carbonate is integral in crystal form and uniform in granularity distribution. The preparation method comprises the following steps of: placing a foamed nickel sheet in a nickel nitride solution, and modulating an aqueous solution and controlling pH, reacting temperature and a reacting duration, so as to realize the in-situ growth of a basic nickel carbonate crystal on the foamed nickel sheet. The nickel source of the basic nickel carbonate thin film growing on the foamed nickel sheet through an in-situ growth method is derived from the substrate surface and the solution, and in comparison with a thin film obtained through simple deposition on the substrate, the thin film is closely bonded with the substrate, stronger in adhesion and difficult to fall.

The invention relates to preparation of a thin-layer black phosphorene / single-walled carbon nanotube composite material and electro-catalysis application of the thin-layer black phosphorene / single-walled carbon nanotube composite material in construction of a horseradish peroxidase electrochemical sensor. A nano composite material is prepared by adopting a liquid phase stripping method and a physical mixing method and is used for modifying horse radish peroxidase to construct an enzyme electrochemical sensor, and the enzyme electrochemical sensor is applied to electrocatalysis of trichloroacetic acid, sodium nitrite and hydrogen peroxide. The preparation method mainly comprises the following steps: preparing thin-layer black phosphorene, compounding the thin-layer black phosphorene with a single-walled carbon nanotube, preparing a thin-layer black phosphorene / single-walled carbon nanotube composite material, modifying the surface of an ionic liquid electrode with the composite material, preparing the enzyme electrochemical sensor with a sandwich structure, and performing electro-catalysis application of the enzyme electrochemical sensor. The composite material prepared by the invention has the advantages of larger effective area, special morphology and stronger conductivity, can improve the stability and dispersity of black phosphorene, and is simple in preparation process, sensitive in detection and good in determination effect.

The invention relates to a universal preparation method for an active site-electrode structure integrated air electrode. The universal preparation method is characterized in that various polymer microspheres having open internally-communicating hierarchical-pore structures are conjugated with active sites like noble metal groups, transition metal groups, and hetero atom-doped carbon groups in virtue of different treatment methods; the different treatment methods may be one or more selected from the group consisting of a carbon tetrachloride cross-linking method, a concentrated-sulfuric-acid sulfonation method, a carbon dioxide gas activation method, a dopamine coating method, an ammonia gas activation method, a polyaniline coating method, an in-situ precious-metal loading method, an in-situ transition metallide growth method and an in-situ heteroatom doping method. The universal method described in the invention can flexibly conjugate open internally-communicating hierarchical-pore electrode structures containing super-macro pores, macro pores, meso pores and micropores with a plurality of different highly-active catalytic sites by using appropriate methods, so the catalytic performance of the air electrode and the overall performance of a fuel cell and a metal-air battery are improved.