60 results about "Potassium hexachloroplatinate" patented technology

The invention discloses a three-dimensional porous gold-solver-platinum ternary alloy nanometer material as well as a preparation method and application thereof. The nanometer material comprises at least one three-dimensional porous gold-solver-platinum ternary alloy nanometer ball; each three-dimensional porous gold-solver-platinum ternary alloy nanometer ball is a nanometer ball having an alloyframework which is of a continuous structure; and a plurality of nanometer pore passages in three-dimensional distribution are arranged among the alloy frameworks. The preparation method of the nanometer material comprises the following steps: mixing potassium chloroplatinate, ascorbic acid and a gold@silver nanometer cube colloidal solution and reacting to prepare a gold@silver-platinum nanometercube colloidal solution; afterwards mixing the gold@silver-platinum nanometer cube colloidal solution with deionized water and performing laser irradiation to prepare a gold-silver-platinum ternary alloy nanometer ball colloidal solution; and finally adding an etching agent to remove some silver elements to obtain the three-dimensional porous gold-solver-platinum ternary alloy nanometer material.The three-dimensional porous gold-solver-platinum ternary alloy nanometer material disclosed by the invention is uniform in size and good in monodispersity, has a relatively large specific surface area and lots of active sites, has excellent electro-catalytic activity and stability on methanol and can greatly shorten the reaction time in a preparation process; and a processing process is simple and easy to operate.

The invention provides an industrialized production method of nano-gold antibacterial agent. The method comprises the following steps: (1) mixing a chloroauric acid solution with a solution containing aminopyrimidines and amino small molecules or a potassium chloroplatinate solution , obtain a mixed solution; (2) quickly add a solution of reducing agent to the mixed solution under stirring, and obtain the nano-gold antibacterial agent after fully reacting; wherein, the volume of the nano-gold antibacterial agent is more than 5L, It is preferably 5 to 100 L, and the addition time of the reducing agent is not more than 5 minutes, preferably not more than 1 minute, and more preferably 10 to 60 seconds. Also provided are the nano-gold antibacterial agent produced by the method, and the application of the method or the nano-gold antibacterial agent.

The invention relates to concave surface gold@silver platinum heterogeneous composite nanoparticles and a preparing method thereof. The method uses prefabricated gold nano-octahedrons as seeds, an ethylene glycol mixed solution containing the gold nano-octahedrons, potassium chloroplatinite, silver nitrate and ascorbic acid is heated in environmental atmosphere by adopting a seed growth method, such that silver and platinum are directionally deposited in six vertexes of the gold nano-octahedrons, and further the gold@silver platinum heterogeneous composite nanoparticles which are uniform in scale, adjustable in component and shaped like a concave surface are formed. The prepared gold@silver platinum heterogeneous composite nanoparticles have better dispersibility and stability in solutions such as water and ethylene glycol and are not agglomerated and deposited or deformed if being preserved at room temperature and environmental atmosphere for long term. The concave surface prepared gold@silver platinum heterogeneous composite nanoparticles obtained by the invention have excellent catalytic activity and optical absorption properties and are expected to have important application values in aspects of surface plasma optics, fuel cells, catalytic hydrogenation and the like.

The invention provides a nano enzyme with a nanometer cage core of a hollow gold-platinum alloy and a shell of a porous silicon dioxide, a preparation method and an application thereof, and belongs tothe field of nanometer materials. The preparation method comprises the following steps: etching a gold core platinum shell nanostructure through potassium hexachloroplatinate to obtain a nanocage ofhollow gold-platinum alloy; coating silicon dioxide on the surface of the nanocage through tetraethyl silicate; and obtaining the nano enzyme taking the nanometer cage, in a round rod shape, of the hollow gold-platinum alloy as a core, and a silicon dioxide shell as the periphery of the core. The length of the core is 80 to 100 nm, and the diameter is 20 to 25 nm. The shell is provided with a channel of 3 to 5 nm. The nano enzyme is negatively charged. The antigen can be bound by an attractive effect of positive and negative electric charges to form a nano enzyme label antigen complex, which is used for performing enzyme linked immunoassay. According to the nano enzyme with the nanometer cage core of the hollow gold-platinum alloy and the shell of the porous silicon dioxide, the preparation method and the application thereof, the cost of a reagent of the natural enzyme label antigen complex is reduced, the working environment of enzyme linked immunodetection is extended, the defects that the natural enzyme is easy to deactivate and denature, etc., are overcame, and the nano enzyme can be widely applied to various enzyme linked immunodetection.

The invention relates to a preparation method of potassium chloroplatinite. The preparation method mainly comprises the following steps of: dissolving platinum with aqua regia; removing nitre and acid; adding potassium chloride; filtering to obtain potassium chloroplatinate precipitate; adding reductant solution; jointly processing by utilizing 200mW/cm<2> cosine ultrasonic wave under 20 to 25kHz and 200mW/cm<2> variable frequency ultrasonic wave under 35 to 40kHz, and continuously stirring at the same time, thus obtaining potassium chloroplatinite solution. According to the preparation method of the potassium chloroplatinite, the specific ultrasonic cavitation effect is utilized to promote the reaction process of reducing potassium chloroplatinate through potassium formate, thus the reaction time is shortened, the reaction is complete, and the yield of potassium chloroplatinite is increased.

Disclosed is a preparation method of a silicon negative electrode material of a lithium ion battery. The preparation method comprises the following steps of (1) putting cleaned silicon powder into a mixed solution of metal salt and HF to be subjected to deposition treatment; and (2) finally, performing oxidization treatment on the surface metal modified silicon powder to form an oxide layer on thesurfaces, not covered with metal particles, of the silicon particles, wherein metal salt is silver nitrate, gold potassium chloride, potassium hexachloroplatinate or copper nitrate. By virtue of thepreparation method, conductivity of silicon powder can be improved, the combination strength between silicon particles and a binder can be reinforced, and the cycle performance of the silicon negativeelectrode material can be greatly improved; and in addition, the preparation method is simple in process, low in cost, very suitable for large-scale industrial production and expected to accelerate development of the silicon-based negative electrode material of the lithium ion battery.

The present invention provides a platinum-palladium-gold nanometer mesoporous electrocatalyst and a preparation method thereof. A potassium chloroplatinate, a sodium chloropalladate and a chloroauricacid solution with concentrations of 5-40 mM, a hydrochloric acid with a concentration of 1-10 mM, and an ascorbic acid solution with a concentration of 0.02-0.5 mM are prepared; the solution of the potassium chloroplatinate, the sodium chloropalladate and the chloroauric acid with the total volume of 4 mL are mixed, the hydrochloric acid with 10-200 [Mu]L is added, and F127 between 10-100mg is added for complete dissolution by ultrasound; and finally, the ascorbic acid solution with 1-5mL is added to uniformly mix with the solution and put the solution into an ultrasonic washing unit for heating to a temperature in a range of 20-60 DEG C, after reaction for 1-6 hours, the solution is washed by pure water, and products are collected by centrifugation and dried to obtain a platinum-palladium-gold nanometer mesoporous electrocatalyst. The reaction time is short, the electrocatalytic methanol oxidation reaction performance is excellent.

The invention discloses a preparation method of a gold-platinum-silver material with an asymmetric structure. The preparation method mainly comprises the following steps of firstly, growing a gold nanorod by using a seed growth method, then cleaning the successfully grown gold nanorod to obtain a gold nanorod with higher purity, then taking the gold nanorod as a seed, adding a corresponding amount of surfactant and potassium tetrachloroplatinate, uniformly mixing, and controlling the reaction temperature, so that platinum successfully grows on the two ends of the gold nanorod, then cleaning a gold-platinum structure to obtain gold-platinum with higher purity, taking the gold-platinum as a new seed, adding a corresponding amount of the surfactant, silver nitrate and ascorbic acid solution, controlling the reaction temperature to finally obtain the asymmetric growth gold-platinum-silver material, and observing the growth condition through a transmission electron microscope. The gold-platinum-silver material with the asymmetric structure synthesized by the preparation method is uniform in growth; the preparation method has simple reaction conditions, high reaction rate and low cost.

The invention discloses a preparation method of a nanogold-platinum composite material in mesoporous silica. The preparation method comprises the following steps of firstly, preparing a gold nanorod raw material, re-dispersing and adding the gold nanorod raw material to a tetraethoxysilane (TEOS) solution according to a certain mode, growing mesoporous silica on the surface of a gold nanorod, then heating the mesoporous silica coated gold nanorod in an oil bath at 60 DEG C, starting a corrosion process by adding a corresponding amount of hydrochloric acid, then adding a large amount of cold methanol to finish corrosion, centrifuging a product, dispersing obtained precipitate in an aqueous solution, and finally, adding a corresponding amount of potassium tetrachloroplatinate solution, adding a corresponding amount of ascorbic acid solution, stirring for 1 minute, uniformly mixing, and standing for 2 hours to obtain a final product. The nanogold-platinum composite material in the mesoporous silica prepared by the preparation method grows uniformly; the preparation method has the advantages of simple reaction conditions, high reaction rate and low cost.

The invention provides a catalyst carrier applied to a direct methanol fuel cell, and also provides an electrochemical sensor applied to the direct methanol fuel cell. A cleaned substrate electrode isput into the catalyst carrier prepared by using the method to carry out electro-deposition, and then is put into a potassium hexachloroplatinate aqueous solution to carry out electro-deposition to obtain a final product. According to the method disclosed by the invention, graphene oxide and polyethyleneimine are doped to form an intercalated composite material so as to obtain the catalyst carrier, and the catalyst carrier is deposited on the surface of a glass carbon electrode, a catalyst platinum is subjected to electro-deposition to obtain the electrochemical sensor; catalytic oxidation reaction on methanol is carried out by adopting a tri-electrode system, and thus, the catalysis effect is obvious. The methanol solutions with different concentrations are detected by using the electrode, a result shows that the catalytic oxidation peak height and the concentration of the methanol appear a linear reaction, and the linearity is good when the concentration of the methanol is between 0.02M and 2.0M, and R2 is equal to 0.996. The catalyst carrier can be used as the electrochemical sensor for detecting the methanol in the solution.

The invention discloses a preparation method for potassium chloroplatinite. The preparation method comprises the following steps: 1) dissolving spongy platinum in aqua regia for denitration, thereby acquiring a chloroplatinic acid solution; 2) dropwise adding the chloroplatinic acid solution into a potassium chloride solution and reacting; 3) washing the potassium chloride solution with ethyl alcohol, and then drying, thereby acquiring potassium chloroplatinate; 4) uniformly mixing deionized water and potassium chloroplatinate, thereby forming a turbid liquid; dropwise adding hydroxylamine hydrochloride solution and potassium hydroxide solution in turn; removing platinum black by filtering under a heat state after the ending of reaction, thereby acquiring the potassium chloroplatinite solution; 5) performing rotary evaporation on the potassium chloroplatinite solution, and then cooling and filtering, and vacuum-drying, thereby acquiring solid potassium chloroplatinite. According to theinvention, hydroxylamine hydrochloride is used as a reducing agent for reducing potassium chloroplatinate, potassium hydroxide is used for neutralizing excessive acid in the system, and potassium chloroplatinate is completely reduced to potassium chloroplatinite, so that high-purity potassium chloroplatinite is prepared. The quality purity of the prepared potassium chloroplatinite is more than orequal to 99.5%, potassium chloroplatinate residue is less than or equal to 0.04% and yield is above 92.2%.