411 results about "Platinum nanoparticle" patented technology

The invention relates to gold-coated particles useful as fuel cell electrocatalysts. The particles are composed of an electrocatalytically active core at least partially encapsulated by an outer shell of gold or gold alloy. The invention more particularly relates to such particles having a noble metal-containing core, and more particularly, a platinum or platinum alloy core. In other embodiments, the invention relates to fuel cells containing these electrocatalysts and methods for generating electrical energy therefrom.

Disclosed herein is a counter electrode for a dye-sensitized solar cell, and a method of producing the same. In the dye-sensitized solar cell which includes a photoelectrode containing a photosensitive dye molecules, in which the counter electrode is positioned opposite to the photoelectrode, and an electrolytic solution interposed between the photoelectrode and the counter electrode, the counter electrode has an electron transfer layer. The electron transfer layer has a structure in which one or more conductive materials, selected from the group consisting of a conductive polymer, platinum nanoparticles, a carbon compound, inorganic oxide particles, and a conductive polymer blend, are sequentially laminated. In the counter electrode, the electron transfer layer promotes smooth electron transfer through an interface between the electrolyte, containing pairs of redox ions, and counter electrode. Thereby, energy conversion efficiency is significantly improved in comparison with a conventional dye-sensitized solar cell employing a counter electrode in which only a platinum layer is applied on a transparent conductive material.

A preparation method of polyaniline / graphene controllable load platinum nanoparticles comprises the following steps of: (1) preparing reduced grapheme; (2) synthesizing a polyaniline / reduced grapheme (PANI / rGNS) nanocomposite by a liquid-liquid interfacial method; (3) preparing a platinum loaded polyaniline / graphene (Pt / PANI / rGNS) nanocatalyst. The invention has the following advantages: by the adoption of the liquid-liquid interfacial polymerization method, the uniformly dispersed PANI / rGNS nanocomposite is synthesized, thus effectively preventing the agglomeration of the composite material,making for uniformly and controllably loading PtNPs on the surface of PANI / rGNS, solving the technical difficulty of metal particle agglomeration and realizing uniform and efficient loading of PtNPs;an electrochemical test result shows that the catalyst has excellent electrocatalytic activity for methanol oxidation and oxygen reduction and ultrasensitive detection of hydrogen peroxide (H2O2) andglucose can be also realized.

The invention discloses a preparation method of a two-dimensional titanium carbide / carbon nanotube loaded platinum particle composite material. The preparation method comprises the following steps: preparing two-dimensional titanium carbide by chemically peeling off an aluminum atomic layer in Ti3AlC2 by means of HF; and combining the two-dimensional titanium carbide with MWNTs by means of a solvothermal method, and meanwhile, loading the platinum nanoparticles to obtain the Ti3C2 / MWNTs-Pt nano composite material. The preparation method provided by the invention is simple, controllable in process, good in repeatability and low in cost, and industrial production on a large scale is facilitated. The prepared Ti3C2 / MWNTs-Pt nano composite material is large in specific surface area and good in electric conductivity, can be used as an anode catalyst of a direct methanol fuel cell, and shows excellent catalytic activity on methanol oxidation.

The present invention discloses a preparation method for a metal oxide / platinum nanoparticle composite catalyst. The method comprises steps of: using an atomic layer deposition method to grow platinum nanocatalyst particles and a metal oxide; by changing the number of atomic layer deposition cycles, depositing an oxide composite layer of a required thickness and nano particles of a required particle size, wherein both the oxide composite and the nano particles are combined to form the composite catalyst. By the method provided by the invention, the metal oxide / platinum nanoparticle composite catalyst can be prepared accurately and metal catalyst particles are anchored so as to increase thermal stability of the platinum catalyst at a high temperature. Besides, an oxide film and metal have a catalytic synergistic effect so that activity of the catalyst can be improved while sintering resistance of the catalyst is improved.

The invention provides preparation and application of an alpha fetoprotein and carcino-embryonic antigen electrochemiluminescence sensor, and belongs to the technical fields of nano function material, clinical analysis, a bioseneor technology and electrochemistry. The characteristics that platinum nanoparticle @meso-porous silicon @ graphene nanocomposite (PtNPs@m-Si@GS) is strong in conductivity, good in stability, large in specific surface area, good in biocompatibility, strong in catalytic activity and the like are utilized in preparation; an alpha fetoprotein second antibody (anti-alpha fetoprotein (AFP)) and a carcino-embryonic antigen secondary antibody (anti-carcino-embryonicantigen (CEA)) are marked, so as to prepare the marked second antibodies Ru-PtNPs@M-Si@GS / anti-AFP and luminol-PtNPs@M-Si@GS / anti-CEA; and the sensitivity of the sensor is obviously improved. Compared with other single-channel electrode sensors, alpha fetoprotein and carcino-embryonic antigen can be simultaneously detected on a same electrode at one time; the detection efficiency is obviously improved; and the alpha fetoprotein and carcino-embryonic antigen electrochemiluminescence sensor has important scientific significance and application value on clinical early diagnosis of hepatic carcinoma.

The invention provides a catalyst used for preparing isobutene through isobutane dehydrogenation and a preparation method and application of the catalyst. According to the catalyst, magnesium aluminate spinels serve as carriers, platinum nanoparticles serve as active components, tin serves as a first addition agent, and alkaline metal or alkaline-earth metal serves as a second addition agent; by weight of the magnesium aluminate spinel carriers, the capacity of the platinum nanoparticles is 0.2-0.6 wt%, the capacity of the first addition agent is 0.01-2 wt%, and the capacity of the second addition agent is 0.5-2 wt%. The invention further provides the preparation method of the catalyst and application of the catalyst in the field of preparing isobutene through isobutane dehydrogenation. The catalyst used for preparing the isobutene through isobutane dehydrogenation has high isobutane conversion rate and high isobutene selectivity; moreover the catalyst has good high-temperature stability; meanwhile the catalyst can inhibit deposited carbon from forming, and therefore side reactions can be effectively inhibited.

The invention relates to gold-coated particles useful as fuel cell electrocatalysts. The particles are composed of an electrocatalytically active core at least partially encapsulated by an outer shell of gold or gold alloy. The invention more particularly relates to such particles having a noble metal-containing core, and more particularly, a platinum or platinum alloy core. In other embodiments, the invention relates to fuel cells containing these electrocatalysts and methods for generating electrical energy therefrom.

Metal oxide nanowires and carbon-coated metal nanowires are effective as supports for particles of an expensive catalyst material, such as platinum metal group catalyst. Such supported catalysts are useful when included in an electrode on, for example, a proton exchange membrane in a hydrogen / oxygen fuel cell. For example, tin oxide nanowires are formed on carbon fibers of carbon paper and platinum nanoparticles are deposited on the tin oxide nanowires. The nanowires provide good surfaces for effective utilization of the platinum material.

The invention relates to a preparation method and application of an electrochemical immunosensor for a biomarker, namely a recombinant proprotein convertase subtilisin kexin type 9 (pcsk9) protein for predicting and diagnosing cardiovascular diseases, and belongs to the technical field of electrochemical detection. The preparation method is characterized by comprising the following steps: firstly, performing nitrogen doping on a graphene nanobelt (n-gnrs), performing amination on a fullerene-palladium-platinum nanoparticle (n-C60 / pdpt) composite material and a staphylococcus aureus a protein (spa), and performing layer-by-layer self-assembling so as to immobilize a pcsk9 antibody (ab1); mixing the synthesized nanoparticle-poly-methylene blue (pt-pmb) with the pcsk9 antibody (ab2), and preparing a nano beacon, thereby obtaining the electrochemical immunosensor for pcsk9 protein detection. The electrochemical immunosensor has the advantages of being high in sensitivity, good in specificity and rapid and convenient in detection. A novel method for pcsk9 protein detection is provided, and useful information is provided for clinical prediction and diagnosis on cardiovascular diseases.

The invention relates to methods of preparing metal particles on a support material, including platinum-containing nanoparticles on a carbon support. Such materials can be used as electrocatalysts, for example as improved electrocatalysts in polymer electrolyte membrane fuel cells (PEM-FCs).

The invention discloses a preparation method of a nitrogen-doped carbonized bacterial cellulose loaded nano-platinum electrode material. The material is obtained through the following steps: taking bacterial cellulose as a carbon source, soaking in a urea solution, and preparing nitrogen-doped carbide bacterial cellulose after freeze drying and carbonization. In-situ reduced and loaded nano-platinum particles on fiber are extremely high in methanol oxidation activity. According to the nitrogen-doped carbonized bacterial cellulose prepared by using a soaking-freeze-drying-carbonization technology, the method is mild, the material sources are abundant, the cost is low, and the controllability is high; meanwhile, the content and variety of doped nitrogen can be further regulated and controlled by changing the carbonization temperature; for the nano-scale carbonized bacterial cellulose fiber obtained after carbonization, the original three-dimensional network structure characteristics of the bacterial cellulose can be maintained, the bacterial cellulose is large in specific surface area and is a carbon carrier material with excellent performance, the nano-platinum particles are loaded by using the bacterial cellulose, the dimensions of the nano-platinum particles in an obtained compound are only 2.0 nm, the distribution is uniform, and the utilization rate of metallic platinum can be improved to a great extent.

The invention discloses a branched gold-platinum dual-metal nanoparticle as well as a preparation method and application thereof. The gold-platinum dual-metal nanoparticle has photo-thermal / radio-sensitization combined treatment performance and structurally contains gold-platinum nanoparticles and polyethylene glycol, wherein the gold-platinum nanoparticles are used for photo-thermal / radio-sensitization combined treatment, and polyethylene glycol is used for the surface modification of a thioctic acid terminal of a hydrophilic polymer. The gold-platinum dual-metal nanoparticle can be applied to the photo-thermal / radio-sensitization combined treatment and has the advantages of simplicity in preparation, low cost and remarkable treatment effect.

The invention relates to a platinum supported catalyst based on a porous graphene / nano ceramic sandwiched structure and a preparation method thereof. The platinum supported catalyst includes a porous graphene / nano ceramic carrier with a sandwiched structure and platinum nanoparticles uniformly deposited on the surface of the carrier; the porous graphene / nano ceramic carrier with the sandwiched structure takes porous graphene as a surface layer, and a nano ceramic as a core material is inserted into porous graphene sheet layers. Nanopores in the porous graphene are beneficial for axial transport and electron and proton conduction of water and reaction gas, so that the catalyst component utilization rate is improved, and the use amount of platinum is reduced; the porous graphene / nano ceramic sandwiched structure effectively provides platinum loading sites, migration aggregation of the platinum nanoparticles on the surface of the carrier is limited, and the stability of the catalyst is improved.

A preparing method of a platinum nanometer particle / titanium dioxide nanotube array, an electrode, a non-enzymatic glucose sensor and a composite material are disclosed. The method includes S1), pretreating a titanium sheet, S2) preparing a TiO2 nanotube array through an anodizing manner, S3) preparing a biomimetic polydopamine coating on TiO2 nanotubes through adopting an electropolymerization manner, S4) based on the polydopamine coating and by utilizing the reducibility of itself, loading platinum nanometer particles onto the surface of the titanium dioxide nanotubes and S5) performing performance testing of the non-enzymatic glucose sensor by utilizing the prepared working electrode. According to the platinum nanometer particle / titanium dioxide nanotube array, a composite of the platinum nanometer particles and the titanium dioxide nanotubes is prepared through reduction by adopting a polydopamine electropolymerization manner. The platinum nanometer particle / titanium dioxide nanotube array can be used for manufacturing the non-enzymatic glucose sensor finally. Through a manner of reducing the platinum nanometer particles by the electropolymerization-loaded biomimetic polydopamine, problems that auto-agglutination in traditional polydopamine dipping methods is long in time, poor in uniformity, and the like are overcome.

The invention discloses a preparation method and application of platinum-modified metal organic material MOF 2-Pt-FA as a two-way enhanced photodynamic therapy drug. The preparation method is as follows: first, a two-dimensional MOF nano-sheet with Cu(II) as an active center is prepared, then a platinum nanoparticle is deposited on the surface of MOF 2, and then poly(ethylene glycol)-folic acid ismodified on the surface of MOF 2-Pt to enhance targeting and compatibility to obtain a nano-drug; after the targeted cell uptake of the nano-drug, Cu(II) in the MOF 2 can reduce a concentration of GSH, and thereby the level of light-triggered reactive oxygen species generated by MOF is enhanced; in addition, the platinum nanoparticle in the prepared drug has the catalase-like activity, and can decompose H2O2 in cells into O2 to alleviate the hypoxic environment of tumors; and experiments show that the combination of GSH exhaustion and hypoxia relief can significantly improve PDT efficiency. The metal organic nanomaterial disclosed in the invention can be used as a nano-drug for photodynamic therapy, and has the clinical potential for treating tumors.

The invention discloses a redispersable nanoparticle powder material preparation method. The method comprises the following steps: 1, dispersing polar nanoparticles in water through mechanical stirring or ultrasonic dispersion; 2, gelating a uniformly-dispersed nanoparticle / water suspension to obtain a nanoparticle hydrogel material; 3, carrying out alcohol solvent displacement of the nanoparticle hydrogel material to obtain a nanoparticle alcogel material; and 4, carrying out supercritical carbon dioxide drying of the nanoparticle alcogel material to obtain a solid nanoparticle powder material. The obtained solid nanoparticle powder material can be easily redispersed in water and a plurality of polar solvents. The method does not change the structure or properties of the nanoparticles, and the prepared redispersable nanoparticle powder material is easy to preserve and transport and is convenient to use.

The invention relates to nanowire supported catalysts for fuel cell electrodes. Metal oxide nanowires and carbon-coated metal nanowires are effective as supports for particles of an expensive catalyst material, such as platinum metal group catalyst. Such supported catalysts are useful when included in an electrode on, for example, a proton exchange membrane in a hydrogen / oxygen fuel cell. For example, tin oxide nanowires are formed on carbon fibers of carbon paper and platinum nanoparticles are deposited on the tin oxide nanowires. The nanowires provide good surfaces for effective utilization of the platinum material.

Conducting metal oxide and nitride nanoparticles that can be used in fuel cell applications. The metal oxide nanoparticles are comprised of for example, titanium, niobium, tantalum, tungsten and combinations thereof. The metal nitride nanoparticles are comprised of, for example, titanium, niobium, tantalum, tungsten, zirconium, and combinations thereof. The nanoparticles can be sintered to provide conducting porous agglomerates of the nanoparticles which can be used as a catalyst support in fuel cell applications. Further, platinum nanoparticles, for example, can be deposited on the agglomerates to provide a material that can be used as both an anode and a cathode catalyst support in a fuel cell.

The invention discloses a ternary carbon loaded palladium tin platinum nanoparticle catalyst and a preparation method thereof. The preparation method includes: dissolving a palladium-containing metal salt and a tin-containing metal salt in ethylene glycol, with the palladium and the tin being in an atom ratio of 1:1, adding a platinum metal salt, with the platinum atom and the palladium atom or the tin atom being in a ratio of 0.001:1-0.8:1, finally adding nanoscale carbon powder as a carrier of metal nanoparticles, conducting ultrasonic dispersion to obtain a uniform mixed solution, and then adding a sodium borohydride solution into the mixed solution in a dropwise manner, thus obtaining the highly dispersed ternary carbon loaded palladium tin platinum nanoparticle catalyst. In the invention, ethylene glycol is adopted as the solvent due to its high viscosity, so that the metal ion reduction and precipitation process can be more uniform, and palladium tin platinum nanoparticles with better dispersibility can be generated. The ternary palladium tin platinum nanoparticles prepared in the invention have a particle size of 2-5nm, and electrochemical tests show that the nanoparticles present obvious activity in electrocatalytic oxidation of ethanol and formic acid. The method provided in the invention is simple, and is suitable for large-scale preparation of anode catalyst materials for direct ethanol and formic acid fuel cells.

The invention discloses a nanometer photo-catalyst used in producing hydrogen by decomposing water under visible light response and application of the nanometer photo-catalyst. The catalyst is a nanocomposite which is formed by taking a one-dimensional organic semiconductor nanofiber as a framework, coating the surface of the framework with an inorganic semiconductor titanium dioxide nanolayer and uniformly loading platinum nanoparticles, wherein the organic semiconductor nanofiber is prepared by self-assembling super molecules of perylene diimide and cycle-expanding derivatives, naphthalene diimide derivatives or hexabenzobenzene diimide derivatives with the photochemical stability, D-A structures and visible light response, then titanium dioxide is directly loaded in situ in a body phase organic solution and platinum is reduced and deposited through ultraviolet light in a photo-catalysis aqueous solution system. The catalyst is novel in structure, low in cost and available; the preparation process of the catalyst is simple, environmentally-friendly, low in energy consumption and suitable for preparation in scales; the catalyst is capable of decomposing water in the visible light to prepare the hydrogen, has the actual and wide application prospects in preparation of the hydrogen through decomposing the water in solar light and provides a novel idea and an important reference for forming an efficient photo-catalyst responding to the visible light.

A platinum-carbon electrocatalyst material comprising a carbon support having a minimum BET surface area of 1000 m2 / g, a nitrogen content of at least 2.5 weight percent, which is present in the form of pyridine, pyridone or pyrrole, a phosphorous content of at least 3 weight percent, which is present in the form of phosphate and phosphonate, and a plurality of platinum nanoparticles dispersed on the carbon support having a maximum average particle diameter of 1.5 nm.

The invention relates to a modified glassy carbon electrode (GCE) capable of simultaneously determining dopamine and uric acid in the presence of ascorbic acid as well as a preparation method and an application thereof, and belongs to the technical field of electrochemical analysis and detection. The modified GCE is modified by platinum nanoparticles-cobalt phthalocyanine-multi-walled carbon nanotubes (MWCNTs), wherein, the cobalt phthalocyanine is formed on the MWCNTs in situ, and the platinum nanoparticles are formed on the cobalt phthalocyanine in situ. The preparation method comprises the following steps: preparing a cobalt phthalocyanine-MWCNTs composite material by an in-situ synthesis method; then adsorbing the platinum nanoparticles onto the surface of the cobalt phthalocyanine-MWCNTs by a chemical reduction method; and finally obtaining the GCE modified by the platinum nanoparticles-cobalt phthalocyanine-MWCNTs by a dispensing method. The modified GCE prepared by the method is taken as a novel electrochemical biological sensor and can simultaneously detect the dopamine and the uric acid in the presence of the ascorbic acid. The preparation method is simple, fast and easy to operate and good in selectivity.

The invention relates to a preparation method of a supported platinum titanium dioxide catalyst based on strong interaction of metal and a carrier and an application of the supported platinum titaniumdioxide catalyst in selective hydrogenation reaction. The catalyst is prepared by taking titanium dioxide as a carrier and a platinum compound as a precursor through an ultraviolet light reduction method, and after hydrogen atmosphere reduction, platinum nanoparticles and the titanium dioxide carrier generate strong metal carrier interaction. The characterization results show that the catalyst contains platinum single atoms and platinum nanoparticles loaded on the surface of a carrier, after reduction, the platinum nanoparticles are embedded by the carrier, and the single atoms stably exist,so that the nanoparticles are prevented from further agglomeration to influence the reaction performance, and meanwhile, a Pt-Ti interface is increased. The catalyst is applied to a selective hydrogenation reaction, and the selectivity is greatly improved. The preparation method provided by the invention is simple and easy to implement, the exposed active sites can be regulated and controlled, theactivity and selectivity of the reaction are improved, and the preparation method has an excellent application prospect.

The invention provides a preparation method of loading-type or no-loading-type platinum millimicron electric accelerant basing on metal cluster composition means. It is characterized by: carbon monoxide and precursor of accelerant reacts in conditions of alkaline and 0-100DEG C to preparing the metal cluster composition solution, namely component (A); adding different carbon carrier or carbon carrier with scattering surfactant under the protection of inactive gas or CO or mixing gas of said both, stirring, removing the solution under the protection of inactive gas or CO or mixing gas of said both and 30-120DEG C, getting component (B); water washing and drying component (B) and preparing the carbon-loading or no-loading-type platinum millimicron particle accelerant component (C), the diameter of platinum millimicron particle in component (C) is small and the distribution of particle size is very narrow. The particle size of millimicron Pt accelerant which prepared by the component (C) under the protection of inactive gas or H2 or CO or mixing gas of said three and 100-500DEG C is ranged from 1.8nm to under 20nm and the distribution is narrow, it applies to cathodic electric accelerant of proton exchange membrane fuel cell.

The invention discloses a preparation method of platinum nanoparticles, which comprises the following steps: dissolving glucose and ascorbic acid in water, wherein the concentration of the ascorbic acid is 0.01-0.2mol / L, and the molar ratio of the glucose to the ascorbic acid is 1-15:1; then, adding chloroplatinic acid in a water bath at 60-90 DEG C and reacting for 3-60 minutes to obtain platinum nanoparticles, wherein the molar ratio of the chloroplatinic acid to the ascorbic acid is 1:25-200; and transferring the obtained platinum nanoparticles into a water bath at 50-55 DEG C, adding the chloroplatinic acid of which the molar weight is 0.3-2 times the molar weight of the chloroplatinic acid added in the first time, and regulating the duration time of the water bath to regulate and control the sizes of the platinum nanoparticles. Platinum nanoparticles which have good dispersibility can be prepared under optimal conditions by adopting the method of the invention, and the average particle diameter of the platinum nanoparticles is less than 10nm; the reagents used are nontoxic and harmless; and the invention has the advantages of mild reaction conditions and low cost and can realize regulation and control of the sizes of the nanoparticles.

The invention discloses an efficient and economic method for establishing a multifunctional Pt@BP metal nano doped material. The material is synthesized from black phosphorus nanosheets and K2PtCl4 under ultrasonic assistant by using a one-pot method. In addition, the invention further discloses a preparation method and application of the composite material. By adopting the prepared composite material, a photodynamic anti-tumor treatment effect of a two-dimensional nano material is achieved, and the anti-tumor activity of the material is greatly improved. In addition, the prepared material canbe a platform which has prospects in anti-tumor treatment and catalysis application, and moreover, application of a BP nano doped material in other fields is promoted.

The invention provides a nickel nitride nanometer composite electrocatalytic material, and a preparation method and application thereof. The structure of the nickel nitride nanometer composite electrocatalytic material belongs to a hexagonal crystal system, and the nickel nitride nanometer composite electrocatalytic material has a particle size of 100-200 nm. The preparation method comprises the following steps: preparation of a nickel nitride nanomaterial; sintering of nickel nitride nanomaterial; and deposition of platinum nanoparticles. The catalyst is prepared by compounding the nickel nitride nanomaterial and metal platinum particles (Ni3N / Pt); nickel nitride has high electrical conductivity and can form an electronic channel without hindrance by the Schottky barrier after compoundingwith Pt; and appropriate metal hydroxide catalytic active sites are cooperatively utilized so as to effectively improve electron transfer efficiency during electrolysis of water, so startup overpotential and the consumption of the precious metal Pt in electrolysis of water for hydrogen production can be reduced.

The invention relates to a preparation method and application of an electrochemical sensor for achondroplasia prenatal diagnosis gene-fibroblast growth factor receptor 3 (FGFR3) gene polymorphism detection, belonging to the technical field of electrochemical detection. The preparation method is characterized by comprising the following steps: synthesizing a Hemin-MOFs composite material, reducing platinum nanoparticles onto the Hemin-MOFs composite material, and mixing a single-strand DNA signal probe with the composite material to obtain a biological signal probe; and carrying out layer-by-layer self-assembly by using reducible graphene oxide tetraethylenepentamine, nano gold and avidin to fix the biotinylated DNA capture probe, thereby preparing the electrochemical sensor for FGFR3-1138G>A gene polymorphism detection. The sensor is successfully used for detecting FGFR3-gene single base mutation. The sensor has the advantages of high sensitivity and high specificity, and is quick and convenient for detection. The invention provides a new detection method for prenatal noninvasive diagnosis of achondroplasia.