872 results about "Prussian blue" patented technology

The invention relates to composite aerogel of graphene/Prussian-blue complexes, and a preparation method and application thereof. The composite aerogel is in a three-dimensional network structure formed by graphene sheets. Particles of the Prussian-blue complexes are nano-scaled and attach to the graphene sheets. The preparation method of the composite aerogel includes adding metallic cyanide in graphene oxide suspension, allowing for dispersion to obtain suspension A, dissolving metal salt in aqueous solution containing reductant to obtain solution B, ultrasonically mixing the suspension A and the solution B, allowing for standing, and drying to obtain the composite aerogel. The composite aerogel is large in specific surface area and low in density and is highly conductive. The preparation method of the composite aerogel is simple to operate, low in cost and applicable to large-scale industrial production. The composite aerogel has excellent hydrogen storage performance, hydrogen peroxide catalytic reduction and electrochromic property.

A battery structure is provided for making alkali ion and alkaline-earth ion batteries. The battery has a hexacyanometallate cathode, a non-metal anode, and non-aqueous electrolyte. A method is provided for forming the hexacyanometallate battery cathode and non-metal battery anode prior to the battery assembly. The cathode includes hexacyanometallate particles overlying a current collector. The hexacyanometallate particles have the chemical formula A′_n, A_mM1_xM2_y(CN)₆, and have a Prussian Blue hexacyanometallate crystal structure.

The invention discloses a prussian-blue type sodium ion battery positive electrode material and a preparation method therefor. According to the material, iron ions in iron-nitrogen octahedron in prussian-blue crystal lattices are substituted by transitional metal elements from the interiors to the surfaces of crystal particles based on concentration gradient; the molecular formula of the positive electrode material is Na<x>M<y>Fe<1-y>[Fe(CN)<6>]<z>.nH<2>O, wherein M is a substituting element. The preparation method comprises the following steps of dissolving sodium ferrocyanide, ferrous chloride, and a mixture of substituting element chloride and ferrous chloride into deionized water separately to obtain each precursor solution; then performing a co-precipitation reaction to obtain a prussian-blue turbid liquid, wherein the substituting element is distributed from the interiors to the surfaces of the crystal particles based on concentration gradient; and performing centrifuging, washing and vacuum drying to prepare the positive electrode material. The positive electrode material has the characteristics of high capacity, high cycling stability, simple preparation and the like.

A system and method producing electrodes in an aqueous electrolyte battery that maximizes energy storage, reduces electrochemical decomposition of the electrolyte, and uses Prussian Blue analogue materials for both electrodes, with an anode electrode including an electrochemically active hexacyanometalate group having two possible redox reactions of different potentials. These potentials may be tuned by substituting different electrochemically inactive components.

Gadolinium⁺³ (Gd³⁺) containing (or incorporated) Prussian blue lattice contrast agents that can be used as an MRI contrast agent have unexpectedly improved r₁ relaxivities of 1 or 2 magnitudes higher than the commercial Gd³⁺-chelates as well as exceedingly, non-toxic, low release of the Gd³⁺ ions into an aqueous environment at a pH of about 2 to about 7.5. The Prussian blue lattice containing Gd³⁺ ions therein can be used for clinical diagnosis intravenously to human beings for medical imaging. The particle sizes of the doped Prussian blue lattices are of a nanosize scale and are very stable against agglomeration.

The invention discloses a Prussian blue positive electrode material and a sodium ion battery. The preparation method comprises that the salt solution of M creeps to the mixed solution of Na4Fe(CN)6 and a sodium salt, the obtained solution is heated in a protective atmosphere to obtain a Prussian blue intermediate, the intermediate solution is transferred into a high-pressure reaction kettle, and a heating reaction is performed at a certain temperature to obtain the Prussian blue positive electrode material, or the intermediate solution is subjected to high-temperature spray drying to obtain the Prussian blue material powder. According to the present invention, through the high-temperature and normal pressure reaction and the high-pressure and high-pressure heating reaction, the prepared material has advantages of perfect crystal structure, less defect and low water content, and can improve the specific capacity and the stability of the battery in the application as the sodium ion battery positive electrode material; and the preparation method is simple, and is suitable for continuous large-scale production.

The invention discloses a conductive polymer coated Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The conductive polymer coated Prussian blue sodium ion battery positive electrode material comprises an inner core layer and an outer coating layer; the inner core layer is a Prussian blue analogue; and the outer coating layer is made of a conductive polymer. The conductive polymer is polymerized in situ on the surface of the Prussian blue analogue, so that a core-shell structure with a bulk phase material being the Prussian blue analogue and the surface coated with the conductive polymer is realized, the ionic conductivity and the electron conductivity of the material are improved, meanwhile the cycling stability and the rate performance of thematerial are also improved, and a new way is provided for large-scale application of the Prussian blue analogue to a sodium ion battery.

The invention discloses a method for preparing a hierarchical bimetallic composite oxide denitrification catalyst by employing a prussian blue analogue as a precursor, and belongs to the technical field of hierarchical material preparation and environmental protection. The preparation method comprises the following steps of (a) preparing the prussian blue analogue, wherein the shape and size of the prussian blue analogue are controlled by controlling the reaction temperature, reaction time and the concentration and ratio of reagents under the condition that polyvinylpyrrolidone is used as a surfactant; and (b) calcining the prussian blue analogue prepared in the step (a) by controlling the temperature to obtain the hierarchical bimetallic composite oxide denitrification catalyst. According to the method, due to the combined action of a hierarchical porous structure and highly uniformly dispersed active ingredients, the catalyst has high catalytic activity and a wide active temperature interval, and can be used for the selective catalytic reduction removal of ammonia of nitrogen oxide in flue gas emitted by various movable source and fixed sources.

The invention provides a method for synthesizing a high-sodium iron-based Prussian blue electrode material. The high-sodium iron-based Prussian blue electrode material comprises the following raw materials in percentage by mole: 25-43 percent of iron ion-containing metal salt, 25-43 percent of ferricyanide ion-containing metal salt and 14-50 percent of a complexing agent. The method comprises the following steps: 1, adding the iron ion-containing metal salt and the complexing agent into a container according to the ratio of the raw materials, adding a solvent, mixing, thereby obtaining a solution A; 2, adding the ferricyanide ion-containing metal salt into the container according to the ratio of the raw materials, adding the solvent, mixing, thereby obtaining a solution B; 3, mixing the solution A and the solution B, and reacting for 2-24 hours; and 4, respectively washing the obtained materials for several times by using water and ethanol, removing the impurities, drying, thereby obtaining the high-sodium iron-based Prussian blue electrode material. The obtained material serves as a sodium ion battery cathode material and has excellent electrochemical performance. The method is low in cost, readily available in raw materials, simple in process and easy for industrial production.

The invention discloses a method for preparing a nanometer Co-Fe prussian-blue complex-carbon nano tube composite hydrogen peroxide sensor, which comprises the following steps of: a, preparing Co-Fe prussian-blue complex nano particles; b, performing surface pretreatment on a glassy carbon electrode; c, mixing the Co-Fe prussian-blue complex nano particles and an acidized multi-walled carbon nano tube ultrasonically for 30 to 60 minutes; and d, dropping and coating the ultrasonically-mixed solution in the step c on the glassy carbon electrode, and drying by using an infrared lamp to obtain the novel hydrogen peroxide sensor. In the nanometer Co-Fe prussian-blue complex-carbon nano tube composite hydrogen peroxide sensor prepared by the method, the linear range response to H2O2 is between 1 micrometer and 1.1 millimeters, the detection limit is 0.25 micrometer, and the sensitivity is 255 micro A mM<-1>cm<-2>, so the method is high in sensitivity and low in detection limit.

The invention discloses novel Prussian blue mesocrystals and a preparation method thereof, and belongs to the technical field of the preparation of inorganic materials. The Prussian blue mesocrystals with novel hierarchical self-assembly structures are prepared by mixing ferrocyanide salt serving as a raw material with inorganic acid at a specific concentration through hydro-thermal treatment. The prepared integral mesomorphous particles are in shapes of scobinate octahedrons, similar octahedrons, similar spheroids and great lake rocks and consist of numerous small-scale crystals, and all the small-scale crystals are nanorods and nanocubes of between 150 and 250 nm. The Prussian blue mesocrystals can be applied in the field of catalysis due to larger specific surface areas and a mass of pore spaces; and the invention has the advantages of novel morphology of product particles, low cost, simple equipment, easy operation and the like.

The invention discloses a preparation method and application of activated carbon for recycling gold and belongs to the field of wet metallurgy and precious-metal recovery. The method disclosed by the invention comprises the following steps: weighing a certain amount of activated carbon, washing to remove ash in the activated carbon by using deionized water, filtering and drying; stirring and dipping the activated carbon at normal temperature by using a transition metal salt solution, washing, filtering and drying; stirring and dipping at normal temperature by using ferrous cyanate ([Fe(CN)6]4-) salt solution in a certain concentration range, generating a Prussian blue analogue compound on the surface of the activated carbon, washing and filtering; and drying the filtered activated carbon for later use. According to the activated carbon prepared by the method, gold ([Au(S2O3)2]3-) in thiosulfate solution can be recycled, the highest recovery rate can be 100 percent, and the maximum capacity of the activated carbon can be 1.27kg/t.

The invention relates to a Prussian blue analogous positive material for sodium-ion batteries and a preparation method of the positive material and belongs to the technical field of sodium-ion batteries. The chemical composition of the positive material is Na2Ni0.4Co0.6Fe(CN)6. The preparation method of the positive material comprises the following steps: respectively dissolving nickel salt, cobalt salt and sodium ferrocyanide in water to prepare a nickel salt solution, a cobalt salt solution and a mother solution which are same in concentration; simultaneously adding the nickel salt solution and the cobalt salt solution into the mother solution, subsequently stirring in dark places at room temperature; then ageing at the room temperature; subsequently centrifuging and carrying out solid-liquid separation, firstly washing while centrifuging, subsequently washing by using absolute ethyl alcohol, and finally drying to prepare the positive material. The positive material has a plurality of characteristics of high capacity, high cycling stability and high coulombic efficiency and serves as novel low-cost and environmentally-friendly energy storage positive material for the sodium-ion batteries; the raw materials used by the method are widely distributed in the nature, are low in cost and are environmentally-friendly; the method is simple and is liable to control; the prepared positive material is stable in performance.

The invention discloses a potassium-sodium-manganese-iron-based Prussian-blue electrode material, and a preparation method and application thereof, belonging to the technical field of synthesis of new-energy materials. According a technical scheme in the invention, the potassium-sodium-manganese-iron-based Prussian-blue electrode material has a general chemical formula of K<x>Na<y>MnFe(CN)<6>, wherein x and y are both more than 0 and less than 2; and the material has a cubic structure and a particle size of 10 to 200 nm. The invention also discloses the preparation method for the potassium-sodium-manganese-iron-based Prussian-blue electrode material and application of the material to the positive electrode of a sodium-ion battery. The potassium-sodium-manganese-iron-based Prussian-blue electrode material prepared in the invention has the cubic structure and a particle size of 10 to 200 nm; the nanometer three-dimensional structure of the material leads to increase in the specific surface area of the material and effective reduction in transfer distance of ions or electrons in the electrode material, so the rate performance and cycle stability of the electrode material are improved; and the electrode material has excellent electrochemical performance as a positive electrode material for the sodium-ion battery.

The invention discloses a preparation method and application of a hollow Prussian-blue nanometer cube. The preparation method for the hollow Prussian-blue nanometer cube comprises the following steps: step 1, heating polyvinylpyrrolidone hydrochloric acid solution containing potassium ferricyanide and preparing a Prussian-blue nanometer cube of a solid structure by using a slow chemical aging method; and step 2, dispersing the Prussian-blue nanometer cube prepared in the step 1 and polyvinylpyrrolidone in a hydrochloric acid solution at the same time, carrying out a hydrothermal reaction and then carrying out centrifugation, washing and drying so as to obtain the hollow Prussian-blue nanometer cube. According to the invention, the uniform cubic morphology of the prepared Prussian-blue nanometer material is guaranteed by using the slow chemical aging method and controllable acid etching under hydro-thermal conditions is carried out, so Prussian-blue forms a unique hollow cubic morphology; and thus, catalytic activity of the material is improved. The prepared hollow Prussian-blue nanometer cube shows excellent electrochemical catalysis response in application to a hydrogen peroxide sensor.

The invention provides a sodium-ion battery positive material. The sodium-ion battery positive material contains a compound of a prussian blue compound KnAa[B(CN)x]b and a metal material, wherein A and B are transition metals, n ranges from 0 to 2, a ranges from 1 to 4, x ranges from 1 to 8, b ranges from 0.5 to 4, and the content of metals is 0-80wt.%. The electrochemical performance of the prussian blue compound compounded with the metal material is obviously improved. Compared with the positive material of a single electron transfer sodium-ion battery, the material disclosed by the invention has higher capacity and better cycling stability. In addition, the invention also provides a preparation method of the sodium-ion battery positive material and application of the sodium-ion battery positive material in energy storage elements.

The invention belongs to the field of nanomaterials, and discloses a nickel-cobalt bimetallic phosphide electrocatalyst as well as a synthesis method and an application thereof. The Prussian blue analogue precursor synthesized through simple aging reaction is further subjected to low-temperature phosphating reaction, and a NiCoP multi-hollow porous nanocube electrocatalyst is obtained. The seriesof bimetallic phosphides have lower charge transfer resistance and reaction barrier for oxygen evolution reaction, and have superior performance in electrocatalytic oxygen evolution reaction. Besides,the catalyst is low in cost and convenient to operate, adopts a simple process and has superior catalytic performance, and basic application research is provided for the materials in the field of electrocatalysis.

The invention relates to a porous nitrogen-doped carbon supported cobalt nano-material, a preparation method and application thereof. The preparation method comprises the steps of dissolving a cobaltsource in a sodium citrate solution, having a hybrid reaction with cobalt potassium cyanide to obtain a Prussian blue similar nanocube; mixing and stirring with a dopamine aqueous solution in a buffering solution to obtain a dopamine coated cobalt-based Prussian blue composite material; after drying, annealing and roasting at a high temperature; then adding inorganic acid in a reaction kettle foracid-pickling to obtain the porous nitrogen-adopted carbon supported cobalt nano-material. The result shows that the material has a relatively good electronic transmission performance, a huge specificsurface area, good stability and many active site, has relatively good electrocatalytic activity in alkaline electrolyte and can serve as a three-function catalyst for oxygen precipitation, hydrogenprecipitation and oxygen reduction reaction.

A battery is provided with a hexacyanometallate cathode. The battery cathode is made from hexacyanometallate particles overlying a current collector. The hexacyanometallate particles have the chemical formula A_XM1_MM2_N(CN)_Z.d[H₂O]_ZEO.e[H₂O]_BND. where A is a metal from Groups 1A, 2A, or 3A of the Periodic Table, where M1 and M2 are each a metal with 2+ or 3+ valance positions, where “ZEO” and “BND” indicate zeolitic and bound water, respectively, where d is 0, and e is greater than 0 and less than 8. The anode material may primarily be a material such as hard carbon, soft carbon, oxides, sulfides, nitrides, silicon, metals, or combinations thereof. The electrolyte is non-aqueous. A method is also provided for fabricating hexacyanometallate with no zeolitic water content in response to dehydration annealing at a temperature of greater than 120 degrees C. and less than 200 degrees C.

The invention discloses prussian blue nano-scale hollow olivary microballoons, and belongs to the technical field of prussian blue materials. A preparation method of the prussian blue nano-scale hollow olivary microballoons comprises the following steps that 1, acrylamide as a monomer, N,N'-methylenebisacrylamide as a cross-linking agent, ammonium persulfate as an initiator and ethanol as a solvent are prepared into crosslinked polyacrylamide hydrogel microballoons by a dispersion polymerization technology; 2, hydrogel microballoon/ethanol suspending liquid is added with a Fe<3+> salt aqueoussolution; 3 the mixed solution obtained by the step 2 is stirred violently for one night so that the crosslinked polyacrylamide hydrogel microballoons swelled by Fe<3+> deform; 4, a potassium ferrocyanide aqueous solution is added dropwisely into the mixed solution treated by the step 3 to form prussian blue shells; and 5, the solvent is removed so that the prussian blue nano-scale hollow olivarymicroballoons are obtained. The preparation method of the prussian blue nano-scale hollow olivary microballoons has the advantages of simple operation, low cost, good adaptability for large-scale production, and controllability of microballoon sizes. The prussian blue nano-scale hollow olivary microballoons have nano-scale short axis sizes and micron-scale long axis sizes, and can be utilized widely for drug slow release, sensors, electrode materials and the like.

The invention relates to an electrolyte for an aqueous zinc ion secondary battery and preparation method and application of electrolyte, and belongs to the technical field of batteries. The electrolyte comprises a soluble zinc salt, a nickel salt, a pH buffer agent and deionized water, wherein the concentration of the zinc salt is (1-3)mol/L, the concentration of the nickel salt is 0.1-0.4 thousandth of the concentration of the zinc salt, the concentration of the pH buffer agent is 0.1mol/L, and a negative ion contained in the nickel salt and a negative ion contained in the zinc salt are samein constituent. By simultaneously introducing the buffer agent and nickel ions into the electrolyte, the decomposition of the electrolyte in the charge-discharge process can be remarkably reduced, thecoulombic efficiency and the cycle stability of a Prussian blue zinc ion battery are improved, and the problems of electrolyte decomposition and relatively poor battery cycle stability of a Prussianblue positive electrode aqueous zinc ion battery system in the prior art are solved. Moreover, the electrolyte is simple in formula and low in cost, is green and environmental-friendly and is suitablefor the field of energy storage on a large scale.

The invention provides a negative electrode material of a lithium ion battery. The negative electrode material is an in-situ compound of a prussian blue derivative and a high-conductivity carbon material and has high specific capacity per gram and excellent rate property, and the lithium ion battery applying the material has favorable cycle stability. Meanwhile, the invention provides a preparation method of the material. With a low-cost raw material and low-energy consumption synthesis circuit, the material and the preparation process has excellent economic characteristics.

The invention discloses a preparation method and application of 2-mercaptobenzothiazole modified activated carbon, belonging to the fields of wet metallurgy and precious metal recovery. The preparation method comprises the steps of dissolving 2-mercaptobenzothiazole as an activated carbon modifying agent with an organic solvent or a strong base solution, and preparing 2-mercaptobenzothiazole modified activated carbon by virtue of an impregnation method, wherein the 2-mercaptobenzothiazole modified activated carbon is used for adsorbing Au(S2O3)2<3->. According to the preparation method, the disadvantages that cyanogen is polluted during adsorption recovery of activated carbon supported copper cyanide complex ions (Cu(CN)4<2->), a modifying process of loaded prussian blue is complicated, and continuous adsorption is difficultly realized, and the like are solved; the modified activated carbon is capable of adsorbing gold in thiosulfate gold leaching and has the advantages of multistage adsorption capacity and the like.

The invention relates to a hollow mesoporous prussian blue nano photo-thermal diagnosis and treatment agent with an ultrasound contrast function, and a preparation method of the hollow mesoporous prussian blue nano photo-thermal diagnosis and treatment agent. The hollow mesoporous prussian blue nano photo-thermal diagnosis and treatment agent comprises prussian blue nano particles and a thermo-sensitive type phase-change material, wherein the surfaces of the prussian blue nano particles are provided with mesopores; the internal parts of the prussian blue nano particles are hollow; and the thermo-sensitive type phase-change material is loaded in the prussian blue nano particles and comprises a fluorocarbon compound and/or menthol.

The invention discloses a preparation method of a prussian blue analogue nano-material and a use of the prussian blue analogue nano-material in a sodium-ion battery. The preparation method at least utilizes a metal M-containing salt and potassium ferrocyanide as raw materials and a coprecipitation method to prepare a prussian blue analogue nano-material. The prussian blue analogue nano-material has a chemical formula of MHCNFe, wherein metal M represents at least one of Ni, Cu, Fe and Co. The preparation method has simple processes, utilizes cheap raw materials and is suitable for large scale industrial production. The prussian blue analogue nano-material has uniform nanoscale and grain sizes, is used as a sodium-ion battery negative electrode active material and has high cycling stability.

The invention relates to a Prussian blue-based intelligent pH-triggered MRI drug release-monitoring synergetic nanometer diagnosis and treatment agent and a preparation method thereof. The nanometer diagnosis and treatment agent comprises hollow Prussian blue nanometer particles with mesopores. The surfaces of the hollow Prussian blue nanometer particles with mesopores are coated with KxMny[Fe(CN)6]z, wherein x is greater than or equal to 0.05 and less than or equal to 0.3, y is greater than or equal to 0.5 and less than or equal to 0.98 and z is equal to 1. The nanometer diagnosis and treatment agent comprises hollow mesoporous nanometer particles with core-shell structures. The HMPB-Mn nanometer diagnosis and treatment agent is used for tumor part pH-sensitive MRI and pH-sensitive drug release control in chemotherapy. Through combination with thermotherapy, MRI-guided thermotherapy-chemotherapy combined treatment on tumors is realized.