41 results about "In situ chemical reduction" patented technology

Optically transparent, conductive polymer compositions and methods for making them are claimed. These conductive polymer compositions comprise an oxidized 3,4-ethylenedioxythiopene polymer, a polysulfonated styrene polymer, single wall carbon nanotubes and / or metallic nanoparticles. The conductive polymer compositions can include both single wall carbon nanotubes and metallic nanoparticles. The conductive polymer compositions have a sheet resistance of less than about 200 Ohms / square, a conductivity of greater than about 300 siemens / cm, and a visible light (380-800 nm) transmission level of greater than about 50%, preferably greater than about 85% and most preferably greater than about 90% (when corrected for substrate). The conductive polymer compositions comprising single wall carbon nanotubes are made by mixing the oxidized 3,4-ethylenedioxythiopene polymer and polysulfonated styrene polymer with single wall carbon nanotubes and then sonicating the mixture. The conductive polymer compositions comprising metallic nanoparticles are made by a process of in situ chemical reduction of metal precursor salts.

The invention relates to a graphene / cotton cloth flexible conducting fabric and a preparing method of the graphene / cotton cloth flexible conducting fabric. The graphene / cotton cloth flexible conducting fabric is prepared through the following steps of adsorbing oxidized graphene through cotton fabrics, and then performing in-situ chemical reduction. An impregnation-drying method is used for covering the oxidized graphene on the surface of the cotton fabric fiber; then, an in-situ chemical reduction method is used for reducing the oxidized graphene into graphene, so that the cotton fabric has good conducting performance. The applied method has the advantages that the use of surfactants, auxiliary agents and toxic substances is avoided; the preparing method belongs to a safe, simple, convenient, green, energy-saving and environment-friendly preparing method.

The invention belongs to the technical fields of materials and biology, and in particular relates to a surface-enhanced Raman scattering (SERS) tag microsphere and a preparation method thereof. The preparation method comprises the following steps of: reducing silver nitrate solution by using a reducing agent by taking a polymer microsphere of which the surface is provided with a carboxyl functional group as a template by an in-situ chemical reduction method to prepare a composite microsphere with uniform and compact surface silver nanoparticle coverage degree; and cladding a silicon dioxide shell by using a chemical adsorption Raman probe molecule and a silane coupling agent by a sol-gel method to obtain the SERS tag microsphere with high SERS activity. The SERS tag microsphere has monodispersity, high stability and high biocompatibility, a silicon dioxide surface is easily modified into functional groups such as an amino group or carboxyl and the like, and the SERS tag microsphere is chemically combined with a biomolecule and is applied to the fields of immunoassay, biomedical imaging, disease treatment and the like. The method is easy to operate, and has a controllable process and a good application prospect.

The invention discloses hybridized particles, a polymer-based composite material, their preparation methods and a use of the polymer-based composite material. The hybridized particles comprise insulating ceramic particles and conductive microparticles loaded on the surfaces of the insulating ceramic particles. The conductive microparticles are granularly and discretely distributed on the surfaces of the insulating ceramic particles. The preparation method of the hybridized particles adopts an in-situ chemical-reduction technology, a sol-gel technology, an in-situ polymerization technology, a high-temperature heat treatment technology or a mechanical milling technology. The polymer-based composite material comprises the hybridized particles and a polymer filled with the hybridized particles. The polymer-based composite material comprises 20-80wt% of the hybridized particles. The hybridized particles have stable structures and stable performances. The polymer-based composite material has the excellent performances such as high dielectric constant, low dielectric loss and stable performances. The preparation methods of the hybridized particle and the polymer-based composite material have the advantages of simple process, easy control of conditions, high production efficiency and industrial production applicability.

The present invention relates to a preparation method of Pt / CNT electrode catalyst carried by carbon nano tube. It is characterized by that the carbon nano tube can be used as carrier, a light-catalyzed in-situ chemical reduction precipitation method is utilized, and the ethylalcohol (or formaldehyde) can be used as reduction agent, and the chloroplatinic acid can be reduced and deposited on the activated carbon nano tube so as to obtain the invented Pt / CNTs catalyst with high activity for proton, exchange membrane fuel cell direct methyl alcohol fuel cell. As compared with existent electrodecatalyst said invention features large specific surface area, high porosity, good dispersion property and low platinum use level.

The invention discloses a preparation method and an application of a Cd / CdS heterojunction visible light photocatalyst rich in sulfur vacancies. The method comprises the following steps: synthesizingan intermediate CdO / CdS composite material through a thermal treatment technology by using CdS prepared by a solvothermal technology as a precursor, and performing an in-situ chemical reduction technology by using sodium borohydride to directly obtain the Cd / CdS heterojunction visible light photocatalyst. The prepared Cd / CdS composite visible light photocatalyst contains a lot of sulfur vacancies,so the absorption and the utilization of visible lights by the catalyst are greatly improved, and the contact between highly-conductive Cd and CdS is close, thereby the photogenerated electrons can be well separated from holes, and the photocatalytic efficiency is high. The heterojunction photocatalyst has a high stability, has an excellent photocatalytic activity under the irradiation of visiblelights, and can be used for catalyzing photodegradation of water to produce hydrogen. The preparation method has the advantages of low requirements of preparation conditions, simplicity in operation,cheap and easily available raw materials, environmental protection, high visible light catalysis efficiency, and broad application prospect in the photocatalysis field.

The preparation method of Pt-Ru series CO resistant electrode catalyst is characterized by that it uses carbon nano tube as carrier, utilizes the in-situ chemical reduction homogeneous precipitation method and makes the ions of Pt, Ru and Sn into compounding ion respectively (called complex ion for short), then it uses two kinds of three kinds of complex ions and mixes them together to obtain metastable colloid, them adopts cheap reduction agent formaldehyde (or sodium borohydride or ethyl alcohol or hydrogen gas) to make the metastable colloid be reduced and deposited on the activated carbonnano tube so as to obtain the invented electrode catalyst for proton-exchange membrane fuel cell. It possesses good electric catalytic activity and resistance to Co, and features large specific area,high porosity, good dispersion property and low ptatinum use level.

The invention discloses a fuel cell catalyst taking multi-element compound as a carrier and a preparation method thereof, relating to a fuel cell catalyst and a preparation method thereof. The fuel cell catalyst of the invention adopts the mixed material of a granular carbon material (C1) and a linear carbon material (C2) as a carbon basal material; a precipitation thermal decompositing method is carried out on the two basal materials to prepare a compound carrier MOx-(C1+C2) of a carbon carrier and an oxide; an in-situ chemical reduction method is carried to prepare a Pt / MOx-(C1+C2) catalyst; MOx is CeO2, SnO2, Co3O4 or NiO; C1 is carbon black, carbon microsphere or mesoporous carbon; C2 is carbon fiber or carbon nanometer tube; the linear carbon material is combined with the granular carbon material to form a three-dimensional compound network structure, so as to increase the three-phase reaction activity area of the catalyst; and the doped metal oxide enhances the anti-CO capacity of the catalyst, and improves the use ratio of platinum.

The invention belongs to the technical field of function materials, and specifically relates to a Raman strengthening active microsphere and a preparation method and an application thereof. The Raman strengthening active microsphere provided by the invention has a core-shell structure, the core of the Raman strengthening active microsphere is a melamine resin microsphere, and the shell is uniform and compact silver nanometer granules. The preparation method comprises the steps of firstly preparing uniform melamine-oxymethylene microsphere through fasculation, then utilizing a reducing agent to restore silver nitrate through a normal position chemical reduction method, and uniformly and compactly depositing the generated silver nanometer granules onto the surface of the melamine resin microsphere, so as to prepare the MF / Ag-NPs composite microsphere. The raman strengthening active microsphere utilizes a single microsphere as a raman strengthening base material, and is used for detecting Raman. The single Raman strengthening active base material microsphere provided by the invention has the characteristics of high stability and high Raman strengthening property. The method provided by the invention has the advantages that the operation is simple, the process is controllable, and the prepared composite microsphere can be used for analyzing and detecting organic contaminants such as pesticide residue of a single microsphere in a Raman manner.

Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.

The invention discloses a preparation method of an antibacterial dressing for promoting wound healing, comprising the following steps of: carrying out pretreatment on flocculent bacterial cellulose obtained by utilizing a dynamic zymotechnics, and then uniformly implanting nano silver on the bacterial cellulose surface by utilizing an in-situ chemical reduction method to obtain a bacterial cellulose nano silver composite material; and placing the bacterial cellulose nano silver composite material into a hyaluronic acid solution for dipping, dehydrating the bacterial cellulose for adsorbing hyaluronic acid, and carrying out a coupling reaction by utilizing carbodiimide to form a bacterial cellulose / hyaluronic acid-loaded nano silver composite material. The composite material has the effects of a controlled release bacteriacide for controlling wound infection and interaction between cells and a substrate and promoting wound healing. In the invention, a composite film is prepared through bacterial cellulose / hyaluronic acid-loaded nano silver, high flexibility of a bacterial cellulose substrate and favorable skin adhesiveness are exerted, and the antibacterial dressing has the antibacterial effect of promoting wound healing and can be used for preparing multipurpose drug wound dressings for accelerating wound repairing.

The invention relates to a preparation method of a proton exchange membrane fuel cell carbon-supported metal electrocatalyst. The active component of the electrocatalyst is Pt-Ag-Co, an atom ratio of Pt:Ag:Co is 20:1:0.01-1:20:0.01, and the mass percentage content of the active component is 10-50%. The preparation method comprises the following steps: 1, dissolving processed carbon powder in an alcohol solvent, carrying out ultrasonic treatment to obtain a uniform slurry, adding an Ag and Co precursor solution to the slurry, and mixing; 2, reducing a mixed solution obtained in step 1 by sodium borohydride for 10-24h, washing, and drying to obtain Ag-Co / C; 3, dissolving the Ag-Co / C by alcohol, and carrying out ultrasonic treatment to obtain a slurry; and 4, processing a Pt precursor through an in situ chemical reduction homogeneous precipitation process to prepare complexing ions, processing to prepare a colloid, and carrying out reduction deposition on the colloid in the slurry obtained in step 3 by using a reducing agent formaldehyde in order to prepare the Pt-Ag-Co / C catalyst. The method has the advantages of simple process, low cost and easy enlarged production, and the catalyst has good catalysis activity, and has better durability than commercial Pt / C electrocatalysts and binary Pt-Ag / C electrocatalysts.

The invention discloses a nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and a preparation method and an application thereof. The preparation method for synthesizing the porous cobaltosic oxide heterogeneous persulfate catalyst by using a nano zero-valent iron modified yeast template technology comprises the following steps: firstly, synthesizing cobaltosic oxide microspheres with high specific surface area and porosity in a high-temperature environment by using Saccharomyces cerevisiae as a biological template; and loading nano zero-valent iron on the surface by an in-situ chemical reduction technology. The synthesized final catalyst is a heterogeneous iron-cobalt bimetallic composite material, and can effectively catalyze peroxydisulfate, whichhas a symmetrical structure and is difficult to activate, through the synergistic circulation effect between ions with different valence states of cobalt and iron. A generated active free radical group (SO4<.-> / .OH) can quickly and efficiently attack tetracycline molecules of antibiotics, and finally mineralize the tetracycline molecules into carbon dioxide and water molecules, so that the catalyst has certain practical application values.

The invention belongs to the technical field of functional materials, and relates to a preparation method and application of a Raman enhancer. The Raman enhancer is a microsphere with a Raman enhancement effect, PS microspheres form the core, and Au / Cu nanoparticles form the shell. The preparation method comprises the following steps: preparing the PS microspheres, depositing Cu on the surfaces of the PS microspheres to obtain Cu-PS by virtue of an in-situ chemical reduction method after activation treatment, and reducing chloroauric acid with sodium citrate to generate a gold nanoparticle for deposition on the Cu-PS, thereby preparing a Au / Cu-PS composite microsphere. According to the prepared Au / Cu-PS composite microsphere, the Au / Cu nanoparticles are non-uniformly distributed on the surface of the PS microsphere to form relatively many hotspot positions, and after a background signal is cancelled through a program, so that a Raman signal can be greatly enhanced. The preparation method is easy to operate and controllable in process, and the prepared Au / Cu-PS composite microsphere can be used for Raman detection in food safety and environmental safety.

The invention provides a flexible base material and a preparation method thereof. Compared with the prior art that a sputtering(or chemical plating) / electric plating method is utilized to prepare the adhesive-free flexible base material, the method utilizes a normal position chemical reduction / electric plating method to prepare the flexible base material on an insulation base material containing a surface layer, and the surface layer contains nanometer particles with micropore structure. First, a middle layer is subjected to the normal position chemical reduction, partial metal particles are infiltrated into micro pores of the nanometer particles to enable physical anchoring fit to be formed between the middle layer and the insulation base material and improve peeling strength. Further, the peeling strength is not reduced after high temperature processing. Second, the particles are in nanometer grade, the insulation base material infiltrated in the middle layer is shallow, interface is smooth, etching performance is good, and manufacture of a fine line is facilitated. Finally, the normal position chemical reduction method can control thickness of the middle layer by adjusting density of oxygen liquid and reduction liquid and spraying time to further prepare the adhesive-free flexible base material with any thickness without special devices, and the preparation process is simple.

The preparation method of Pt-Ru series CO resistant electrode catalyst is characterized by that it uses carbon nano tube as carrier, utilizes the in-situ chemical reduction homogeneous precipitation method and makes the ions of Pt, Ru and Sn into compounding ion respectively (called complex ion for short), then it uses two kinds of three kinds of complex ions and mixes them together to obtain metastable colloid, them adopts cheap reduction agent formaldehyde (or sodium borohydride or ethyl alcohol or hydrogen gas) to make the metastable colloid be reduced and deposited on the activated carbon nano tube so as to obtain the invented electrode catalyst for proton-exchange membrane fuel cell. It possesses good electric catalytic activity and resistance to Co, and features large specific area, high porosity, good dispersion property and low ptatinum use level.

The invention belongs to the technical field of functional materials, and specifically relates to magnetic composite microspheres with a Raman-enhanced characteristic as well as a preparation method and application thereof. The magnetic composite microspheres take ferroferric oxide / carbon composite microspheres as cores and silver nanoparticles as shells. The preparation method of the magnetic composite microsphere comprises the following steps: firstly, preparing the magnetic ferroferric oxide / carbon composite microspheres; then, reducing silver nitrate liquor by using a reducer to prepare the ferroferric oxide / carbon / silver nanoparticle composite microsphere with uniform and compact silver nanoparticles on the surfaces through an in-situ chemical reduction method. The magnetic composite microspheres provided by the invention have the characteristics of high magnetic responsiveness, high stability, high Raman-enhanced characteristic and high recovery rate. The preparation method is simple in operation and controllable in process, and the prepared magnetic composite microspheres can be used for Raman analysis and detection of trace persistent organic pollutants in food safety and environment.

The invention discloses a preparation method for a three-element oxide composite material and an application in the field of super capacitors. According to the method, an in-situ chemical reduction method is employed to prepare a Co-Ni-B alloy material in solution, then the alloy and potassium permanganate realize oxidation reduction reaction to acquire a Co3O4-Ni3O4-MnO2 ternary oxide. Through the method, strong reductibility of the Co-Ni-B alloy and strong oxidizability of the potassium permanganate are utilized to realize oxidation reduction reaction of the two, the Co-Ni-B is oxidized to be Co3O4-Ni3O4, the potassium permanganate is reduced to be MnO2, the method is simple, an application scope is wide, and manufacturing cost is low; the three oxides are composed together, under the synergistic effect among the materials, excellent electricity storage property is realized, the three-element oxide composite material can be applied to the super capacitors, excellent electrical performance is realized, moreover, the method is applicable to mass-scale production, and the application effect is good.

Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.

The invention belongs to the technical field of corrosion inhibition of ocean engineering concrete structure metal materials, and particularly relates to a photo-anode film for reinforcing steel bar photoelectric cathode protection and a preparation method and application thereof. The preparation method comprises the following steps: with ferric salt and urea as raw materials, preparing Fe2O3 on a conductive surface of a clean conductive substrate through a hydrothermal method; making polyaniline deposited on the surface of Fe2O3 through an electrochemical synthesis method to prepare a Fe2O3-PANI composite photo-anode film; and preparing the Ru-Fe2O3-PANI composite photo-anode film on the surface of the Fe2O3-PANI composite photo-anode film through an in-situ chemical reduction method. According to the technical scheme, efficient photoelectric cathode protection of the ocean engineering concrete reinforcement can be achieved, and the durability of an ocean engineering concrete structure is improved.

The invention relates to an experimental facility and method for remediating a saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source based on zero-valent iron-PRB reduction. The experimental facility comprises a water supply device, a cylinder simulator, a sampling device and a waste liquid collecting device which are sequentially connected. According to the method, specific to pollution caused by the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source, a zero-valent iron-PRB is mounted near the pollution source, reductive degradation is carried out on a dissolved-state DNAPL ingredient flowing through a wall body, and the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source is remediated. Simulation experiments show that dissolution rate of the DNAPL pollution source can be increased by mounting the zero-valent iron-PRB near the pollution source, existence time of the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source in an underground environment is shortened, and a design thought and key technical parameters are provided for study of in situ chemical reduction remediation.

The invention discloses a polycarbonate / silver composite surface-enhanced Raman substrate and a preparation method. The substrate is obtained by arranging a poly(bisphenol A) carbonate thin-film dopedwith silver nano-particles on a substrate surface; the preparation method is as follows: arranging the poly(bisphenol A) carbonate thin-film doped with silver nano-particles on the substrate surface;and then reducing a layer of homogeneous silver nano-particles on the thin-film surface by adopting an in-situ chemical reduction method, thereby obtaining the surface-enhanced Raman scattering substrate. The surface-enhanced Raman substrate is simple in preparation, low in cost, and has good surface-enhanced Raman effect and stability.

The invention relates to the field of catalysts, and particularly discloses a nitrogen-doped graphene-carbon nanotube composite catalyst and a preparation method thereof. The invention discloses the nitrogen-doped graphene-carbon nanotube composite catalyst. The catalyst comprises a carbon carrier and noble metal loaded on the carbon carrier; the carbon carrier is composed of nitrogen-doped reduced graphene oxide and a nitrogen-doped carbon nanotube; the preparation method comprises the following steps: mixing nitrogen-doped reduced graphene oxide with a noble metal precursor solution, and depositing noble metal on the nitrogen-doped reduced graphene oxide to obtain noble metal-loaded nitrogen-doped reduced graphene oxide; and combining the nitrogen-doped carbon nanotube with the noble metal-loaded nitrogen-doped reduced graphene oxide through an in-situ chemical reduction method to obtain the nitrogen-doped graphene-carbon nanotube composite catalyst. The nitrogen-doped graphene-carbon nanotube composite catalyst provided by the invention can be used for a fuel cell, and has the advantages of high catalytic activity and high stability; in addition, the preparation method has the advantages of being simple, large in yield and suitable for batch production.

The invention relates to a core-shell-structured silver-based heat-conductive rubber composite material and a preparation method thereof. The composite material comprises a rubber matrix, a vulcanizerand core-shell-structured silver-based heat-conductive filler. The core-shell-structured silver-based heat-conductive filler is prepared through subjecting dopamine to self-polymerization on the surface of high-heat-conductivity inorganic filler so as to form a polydopamine functional layer, putting the heat-conductive filler, of which the surface is coated with a polydopamine layer, into a silver plating solution, adding a reducer glucose solution, and depositing and coating the surface of the high-heat-conductivity inorganic filler with silver nanoparticles by an in-situ chemical reductionmethod. The rubber composite material with high coefficient of thermal conductivity and low dielectric constant is prepared through adding the core-shell-structured silver-based heat-conductive fillerinto the rubber matrix. The composite material is excellent in heat-conducting property and can be applied to electronic packaging materials. The preparation method is simple, convenient, effective and controllable in operation and is economical and environmentally friendly.

The invention discloses a nano zero-valent iron modified porous cobalt tetraoxide heterogeneous persulfate catalyst and its preparation method and application. The preparation method of the nano zero-valent iron modified yeast template method to synthesize porous cobalt tetroxide heterogeneous persulfate catalyst includes using Saccharomyces cerevisiae as a biological template to first synthesize cobalt tetroxide microspheres with high specific surface area and porosity in a high temperature environment, and then Nanoscale zero-valent iron is loaded on its surface through in-situ chemical reduction method. The final catalyst synthesized is a multiphase iron-cobalt bimetallic composite material, which can effectively catalyze peroxodisulfate with a symmetrical structure that is difficult to activate through the cooperative circulation between cobalt and iron ions in different valence states. The generated active free radicals (SO 4 ·‑ / ·OH) can quickly and efficiently attack the oxidative biotetracycline molecules, and ultimately mineralize them into carbon dioxide and water molecules, which has certain practical application value.

The invention discloses a preparation method and application of a Cd / CdS heterojunction visible light catalyst rich in sulfur vacancies. Using CdS prepared by solvothermal method as the precursor, the intermediate CdO / CdS composite material was synthesized by heat treatment method and directly obtained by in-situ chemical reduction method of sodium borohydride. The Cd / CdS composite visible light catalyst prepared by the present invention contains a large number of sulfur vacancies, which greatly improves the absorption and utilization of visible light by the catalyst, and the highly conductive Cd and CdS have closer contact, thereby photogenerating electron-vacancies. The holes can be separated better and the photocatalytic efficiency is higher. The heterojunction photocatalyst has high stability, exhibits excellent photocatalytic activity under visible light irradiation, and can be used to catalyze the photolysis of water to produce hydrogen. The invention requires low preparation conditions, is simple to operate, and has cheap and easily available raw materials. It is environmentally friendly and has high visible light catalytic efficiency. It has broad application prospects in the field of photocatalysis.

The invention discloses a polytrifluoropropyl methyl siloxane / silver composite surface enhanced Raman substrate and a preparation method thereof. According to the method, by means of the enrichment effect of polytrifluoropropyl methyl siloxane on nitrobenzene pollutants, a sol-gel method and an in-situ chemical reduction method are combined to form silver nanoparticles on the surface of a polytrifluoropropyl methyl siloxane film, wherein the silver nanoparticles are uniform in particle size and compact in arrangement; and therefore, the polytrifluoropropyl methyl siloxane / silver composite surface enhanced Raman substrate can be prepared. The polytrifluoropropyl methyl siloxane film in the composite surface enhanced Raman substrate has a good enrichment effect on nitro pollutants in water and does not cause any interference to measurement. The polytrifluoropropyl methyl siloxane / silver composite surface enhanced Raman substrate has the advantages of good repeatability, controllable process, high sensitivity and low cost, and can be used for the surface-enhanced Raman spectroscopy measurement of various substances.

The invention discloses a fuel cell catalyst taking multi-element compound as a carrier and a preparation method thereof, relating to a fuel cell catalyst and a preparation method thereof. The fuel cell catalyst of the invention adopts the mixed material of a granular carbon material (C1) and a linear carbon material (C2) as a carbon basal material; a precipitation thermal decompositing method iscarried out on the two basal materials to prepare a compound carrier MOx-(C1+C2) of a carbon carrier and an oxide; an in-situ chemical reduction method is carried to prepare a Pt / MOx-(C1+C2) catalyst; MOx is CeO2, SnO2, Co3O4 or NiO; C1 is carbon black, carbon microsphere or mesoporous carbon; C2 is carbon fiber or carbon nanometer tube; the linear carbon material is combined with the granular carbon material to form a three-dimensional compound network structure, so as to increase the three-phase reaction activity area of the catalyst; and the doped metal oxide enhances the anti-CO capacity of the catalyst, and improves the use ratio of platinum.

The invention provides a method for preparing a macromolecular material / graphene nanometer composite material by adopting continuous mixing in-situ reduction as well as the application thereof, and relates to the technical fields of a macromolecular material / graphene nanometer composite material and preparation thereof. The used equipment is water assisted melting and mixing extrusion equipment. The preparation method of the nanometer composite material comprises the following steps: pre-mixing a macromolecular material and a GO powder, adding the mixture into the water assisted melting and mixing extrusion equipment to perform mixing extrusion, dissolving a green and non-toxic chemical reducing agent into water to obtain a chemical reducing agent aqueous solution, injecting the obtained solution into macromolecular material melt in an extruding machine by virtue of a metering pump to perform mixing, adding water to promote stripping and dispersing of GO, in-situ chemical reduction andin-situ thermal reduction, and finally preparing a macromolecular material / reduced graphene oxide (RGO) nanometer composite material. In the nanometer composite material prepared by the method, the striping and dispersing of the RGO are good and the reduction degree is high; furthermore, the nanometer composite material has a relatively good dielectric property and mechanical property.