70 results about "Polyoxometalate" patented technology

The invention relates to a solar cell and a preparation method thereof. The solar cell comprises a light absorption layer, a hole modification layer and a hole transmission layer which are arranged in a stacked mode. The hole modification layer is located between the light absorption layer and the hole transmission layer; the material of the hole modification layer comprises at least one of self-assembled monomolecular layer materials and at least one of polyoxometallate. According to the solar cell, the hole extraction capability of the hole transport layer can be improved, the hole mobility of an interface is improved, and the high photoelectric conversion efficiency of the solar cell is further achieved.

The invention is applicable to the technical field of catalyst preparation, and provides a nano composite material for producing H2O2 through photocatalysis and a preparation method, the nano composite material comprises titanium dioxide, nitrogen-doped carbon quantum dots and polyoxometallate, and the general formula is TiO2 / NCDx / POMy; wherein x is an integer from 1 to 4, and y is an integer from 10 to 100. According to the method, through the synergistic effect of the titanium dioxide, the nitrogen-doped carbon quantum dots and the polyacid, the self limitation and defects of the titanium dioxide in the photocatalytic H2O2 production process are effectively overcome, and the H2O2 yield is remarkably improved. Meanwhile, the composite material can still keep stable catalytic performance in a wide pH range, and a new thought is provided for solving the problem that titanium dioxide is limited by the pH environment in the process of producing H2O2 through photocatalysis.

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The application discloses a preparation method and application of PTFE catalytic filter material, and the preparation of the PTFE catalytic filter material comprises MnCeTi catalyst preparation, PTFE catalytic fiber preparation, heteropoly acid functionalization and needling. The three-dimensional flower-shaped spherical structure of the prepared PTFE catalytic filter material is used to optimize the mass transfer and conversion channel of pollutants, the intermetallic interaction of Mn, Ce and Ti is used to regulate the surface acid sites and active sites of the catalyst, the surface oxygen vacancies, acid sites and other characteristics are further optimized through the heteropoly acid functionalization, and the low-temperature catalytic dioxin performance of the PTFE catalytic filter material is effectively improved. Meanwhile, the heteropoly acid can form polyoxometalate on the surface of the catalyst, the adhesion strength of the catalyst and the filter material is strengthened, the loss problem of the catalyst in the use process is effectively relieved, and the prepared PTFE catalytic filter material has high efficiency and long-term use performance.

The application discloses a preparation method and application of a polyacid tannic acid modified ultrafiltration membrane, and the preparation method comprises the following steps: preparing a casting solution containing a high molecular film forming material and a solvent; adding a polyoxometalate into the casting solution, uniformly mixing, and obtaining a polyacid modified casting solution; scraping and coating the polyacid modified casting solution to form a liquid membrane, pre-evaporating, immersing into a coagulation bath containing tannic acid to perform phase inversion and film forming, and obtaining the polyacid tannic acid modified ultrafiltration membrane. Through the synergistic effect of the polyacid blending regulation of the membrane pore structure and the in-situ coordination modification of the tannic acid phase separation, the simultaneous improvement of the permeation flux and the retention rate is realized, the pure water flux of the obtained ultrafiltration membrane reaches 221.37 LMH, the bovine serum albumin retention rate reaches 96.17%, and the preparation process is simple, efficient, and has a good large-scale application prospect.

POM particles are suitable as photocatalytic or electrocatalytic catalyst in the production of hydrogen and a method of producing such POM particles. The POM particles are produced by subjecting a heteropoly acid with the chemical formula HzXY12O40, or a hydrate thereof, to acidic conditions in the presence of a polyvalent cation, wherein z=3 or 4, X is selected from the group consisting of P, Si, Ge, As, Sb and V, and Y is selected from the group consisting of W, Mo and V.

The application discloses a kind of high-efficiency heterogeneous catalyst for CO2 ring addition preparation cyclic carbonate and its preparation method and application, belong to catalyst technical field.The high-efficiency heterogeneous catalyst is transition metal doped polyoxometalate coordination polymer, chemical general formula is C 16 H 58 M2N2Na2O 48 V 10 Wherein, M is selected from Co 2+ , Ni 2+ , Cu 2+ Or Zn 2+ Its preparation method is: sodium vanadate, transition metal acetate and bis (2-hydroxyethyl) amino (trihydroxymethyl) methane ligand are dissolved in water with pH being 1~3, stirring reaction, after filtration, crystallization is stationary, and is obtained.In the ring addition reaction of CO2 and epoxide, the catalyst and cocatalyst tetrabutylammonium bromide synergistic effect, catalytic yield can be up to 98.2%, selectivity is more than 99%, and catalytic activity still remains at 88% after recycling five times.

This disclosure relates generally to solution processed low temperature metal oxide, metal bronze or polyoxometalate materials as charge storage material used in electrochromic devices, charge storage material and electrochromic devices comprising the materials and methods of making and using the same.

The disclosure relates to a dopant complex. The dopant complex is formed of a dopant ion component comprising a metal cation, and polyoxometalate. The disclosure relates also to an electronic component (1). The electronic component (1) comprises a transparent layer (11) and a dopant layer (12). The transparent layer (11) is in direct contact with the dopant layer (12). The transparent layer (11) comprises transparent conductor material. The dopant layer is formed of a dopant complex as described above. The disclosure relates also to use of the dopant complex as described above for improving the aging resistance of an electronic component (1) comprising a transparent layer (11) comprising transparent conductor material, and a dopant layer (12) formed of the dopant complex, by covering the transparent layer (11) by the dopant layer (12), wherein the transparent layer (11) is in direct contact with the dopant layer (12).

The application relates to a preparation method of high-quantum-yield tetraphenyl ethene oxonium salt / polyoxometalate fluorescent nanomaterial and application of the nanomaterial in a white light LED lamp. 10 The self-assembly in an aqueous solution is convenient and fast, and a novel fluorescent nanomaterial with environment-friendly characteristics is prepared. The fluorescent material has good light emitting properties, and the fluorescence quantum yield is 39.88%, which is increased by 2.18 times compared with that of original TPE-1. Through mixing of a low amount of the fluorescent material and commercial fluorescent powder, a white light fluorescent powder under 365nm can be obtained, and the fluorescent powder can be used for LED lamp manufacturing.

Gels and aerogels are provided that comprise one or more polyoxometalate (POM)– complexed nanocrystal cores formed from metal oxides, metal hydroxides, and / or metal oxyhydroxides. Coordination of the nanocrystal surfaces by POM cluster anions imparts enhanced structural stability, surface accessibility, and electronic tunability relative to non- complexed materials. As a result, the POM-complexed nanocrystals exhibit improved performance in chemical, electrochemical, photochemical, and photoelectrochemical processes. Conversion of the POM–nanocrystal complexes into gel and aerogel architectures further enhances reactivity and functional versatility by providing interconnected, high-surface- area networks that retain exposed, catalytically active inorganic surfaces.

This invention discloses a chemiluminescence gas sensor based on polyoxometalates (POMs), and relates to its fabrication method and application. The sensor is suitable for detecting ammonia at room temperature. The gas sensor includes an adapter base and a sensing element, wherein the sensing element consists of interdigitated electrodes and a sensitive material loaded on the electrode surface. This sensitive material is a composite material of POMs and SnO2. POMs, as excellent electron acceptors, possess good redox properties, thermal stability, and photosensitivity. When combined with SnO2, they can effectively suppress electron-hole recombination, thereby significantly improving the gas-sensing performance of the semiconductor material. Compared with existing technologies, the sensor provided by this invention exhibits high response characteristics to ammonia at room temperature, while also demonstrating excellent selectivity and repeatability.

The invention discloses a transition metal atom doped molybdenum disulfide nanosheet as well as a preparation method and application thereof, and relates to the technical field of nano materials. A molybdenum-containing multi-metal oxygen cluster is used as a precursor, a transition metal atom doped molybdenum disulfide nanosheet electrocatalyst with high activity sites is prepared through a hydrothermal method, a battery diaphragm is modified by the transition metal atom doped molybdenum disulfide nanosheet electrocatalyst, and the purposes of sulfur fixation and polysulfide conversion reaction promotion are achieved at the same time. The preparation method of the nanosheet is simple and easy to implement, the polysulfide shuttling inhibition effect and the catalytic effect are obvious, and the cycle performance of the battery is obviously improved.

This invention discloses a method for screening catalysts for the oxygen evolution reaction based on electrochemiluminescence quenching. The catalyst to be tested is loaded onto the working electrode, and then Ru(bpy)3 is added. 2+ In the electrolyte of / Hepes, applying an anodic potential to excite ECL accelerates the OER to generate O2, and O2 quenches the ECL signal. The signal intensity is negatively correlated with the catalytic activity. This method can be used for parallel detection on a single-electrode imaging array, achieving high throughput, visualization, and quantitative screening. It is applicable to various OER catalysts such as polyoxometalates and oxides, and has the advantages of being fast, low-cost, and easy to operate.

The application discloses a TiO2 photocatalytic sterilization material modification preparation method and application, and comprises a substrate and TiO2 nanostructure grafted with polyoxometalate; the TiO2 nanostructure is firmly anchored between the substrate through a chemical bond; and the TiO2 nanostructure is grafted with the polyoxometalate through dopamine assistance; the substrate is loaded with a TiO2 nanorod array, the nanorod has a length of 0.2 mu m to 10 mu m and a diameter of 100 nm to 500 nm, and after the nanorod surface is coated with dopamine, the dopamine surface is loaded with grafted organic molecular chains linked with polyoxometalate particles. The TiO2 nanostructure grafted with the polyoxometalate is constructed on the substrate, the photocatalytic sterilization performance of the photocatalytic material is effectively improved, and the utilization efficiency of sunlight is improved.

The invention discloses an oxidation-reduction heterogeneous cluster framework material as well as a preparation method and application thereof, and belongs to the technical field of framework materials and catalysis. The oxidation-reduction hetero-cluster framework material provided by the invention comprises a polyoxometallate unit and a transition metal cluster unit, the polyoxometallate unit and the transition metal cluster unit are connected through a bridging unit. The polyoxometallate unit is used as an oxidizing unit, the transition metal cluster unit is used as a reducing group, the polyoxometallate unit and the transition metal cluster unit are connected through the bridging unit to obtain the oxidation-reduction heterogeneous cluster frame material, photo-generated charge separation and substrate mass transfer are facilitated, multi-step reactions can be catalyzed, and the reaction efficiency is improved. The catalytic activity and the cycle performance are good; particularly, the carbon-hydrogen bonds can be effectively subjected to photocatalytic oxidation, so that one-pot photocatalytic oxidative imidization of the carbon-hydrogen bonds can be realized under mild conditions.

The application discloses a kind of plasma electron sponge nanochannel composite membranes and preparation method and application thereof, the composite membrane includes a layer of self-assembled arrangement plasma electron sponge film and a layer of membrane material with large pore structure, part of the pore in the self-assembled arrangement plasma electron sponge film and part of the large pore in the membrane material with large pore structure are communicated correspondingly, and electron sponge refers to polyoxometalates (POMs). The application first uses plasma electron sponge nanomaterial as functional material to make nanochannel composite membrane, and plasma electron sponge has excellent and stable performance, mild preparation condition, simple operation and green environmental protection. In addition, the plasma electron sponge nanochannel composite membrane prepared by the application can be used as ion selective membrane in salinity gradient energy conversion, and has the advantages of excellent and stable performance, high conversion power and green environmental protection.

The present invention relates to a catalytic article comprising a substrate and a catalytic composition disposed on the substrate, the catalytic composition comprising a support material on which one or more platinum group metals (PGMs) and a Ta-polyoxometalate (POM) are supported.

The invention provides a synthesis method of N-pyridine oxide, a catalyst and application of the catalyst, and belongs to the technical field of chemical engineering, the method comprises the following steps: firstly, preparing a cerium (IV) interlayer polyoxometallate embedded layered double hydroxides (LDHs) catalyst; putting the prepared catalyst and water into a flask, adding pyridine, dropwise adding 27.5% hydrogen peroxide, performing oxidation reaction with hydrogen peroxide, centrifuging to remove the catalyst, extracting and concentrating filtrate to obtain a crude product, and performing column chromatography gradient elution to obtain white N-pyridine oxide. The N-pyridine oxide obtained by the synthesis method is high in yield and purity, different products are obtained by independently controlling each step of reaction, the operability is high, the generation of side reaction products is reduced, the method has economic adaptability, and a catalytic oxidation mode is adopted, so that the reaction time is shortened, and the reaction yield is improved.

Disclosed are coatable compositions comprising a metal-(meth)acrylate hybrid material that, upon curing, forms a metal-polymer hybrid layer having a relatively high refractive index. The curable metal-(meth)acrylate hybrid composition comprises a photoinitiator, a polyoxometalate, and one of a hydroxyl-functional (meth)acrylate or a mixture of a hydroxyl-functional (meth)acrylate and an aromatic (meth)acrylate. The printable, solvent-free composition forms, upon coating, an optically transparent and metal-polymer hybrid layer having a refractive index of at least 1.52.

Complexes of polyoxometalate (POM) cluster anions and nanoparticle (NP) cores, are disclosed, featuring inherent thermodynamic stability at least due to covalent bonds, which attach the POMs to the NP cores. The nanoparticles coprise a plurality of crystalline, polycrystalline or amorphous metal-oxide, metal oxyhydroxide and / or metal hydroxide compounds. The POM and NP, each independently, may comprise one, two, three or more different metal cations, particularly transition or main group metal cations. These complexes are highly soluble in water and inherently stable to oxidation and hydrolysis in a broad pH range. As such, the complexes are usfule, inert alia, as improved soluble water-oxidation catalysts and stabilizers of metastable crystals.

The application belongs to the technical field of agricultural fungicidal active ingredients, and particularly relates to a copper-tungsten polyoxometalate and a preparation method and application thereof in the field of agricultural fungicides. The existing agricultural fungicidal POM compounds have defects such as insufficient targeted bacteriostatic activity and insufficient preparation stability. The application provides a copper-tungsten polyoxometalate compound Cu-W-POMs, which exhibits excellent fungicidal activity and can effectively inhibit the cucumber fusarium wilt pathogen. Meanwhile, the compound also has a good inhibitory effect on crop disease pathogenic bacteria such as soybean seed rot, pear black spot and apple anthracnose. In particular, the compound can be used for preparing an agricultural fungicide to prevent and control cucumber fusarium wilt and other crop diseases.

The invention relates to the technical field of electrocatalytic materials, and mainly discloses an anti-poisoning electrocatalytic ammoxidation catalyst based on a bimetallic-polyoxometallate interface and a preparation method thereof, and the catalyst is a composite material formed by in-situ growth on a pretreated nickel foam substrate through a hydrothermal method. In the bi-metal-POM structure constructed by the invention, a phosphotungstic acid anion skeleton provides a stable oxygen bridge coordination environment, Cu and Ni active centers can be anchored on the atomic scale, and agglomeration and dissolution under high potential are prevented; heterogeneous bimetal sites formed by Cu and Ni in a POM framework can realize electronic coupling regulation and control through an oxygen bridge, and through bimetal-POM interface electronic regulation and control, the method does not need an additional reducing agent or template agent, is simple in process and high in controllability, and can be expanded to a metal-PTA system of Co, Fe and the like by replacing precursor metal salt, so that the method is suitable for industrial production. The obtained catalyst can keep a uniform structure and stable electro-catalytic performance.

The invention discloses transition metal sulfide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving a molybdenum source in deionized water to obtain a solution A; (2) dissolving other metal sources in deionized water to obtain a solution B; (3) adding the solution B into the solution A, reacting, filtering, washing and drying to obtain a polyoxometallate precursor; (4) adding the polyoxometallate precursor and a sulfur source into a sealed high-temperature-resistant container, uniformly mixing, sealing in vacuum, normal pressure or pressurization, and calcining; and (5) washing and drying to obtain the transition metal sulfide. The method better inherits the morphology advantage of the precursor, the reaction time is short, the technological process is simple and safe, the use of a high-pressure closed environment and a toxic solvent is avoided, the operation risk is low, the energy consumption is low, and the problems that the emission of harmful gas is large and the utilization rate of a sulfur source is low in the vulcanization process are effectively solved; the transition metal sulfide in the sodium ion battery is good in battery rate capability and high in long-cycle constant-current charge-discharge performance stability.

This invention discloses a method for preparing a heterogeneous Fenton catalyst, the resulting catalyst, and its applications. The method for preparing the heterogeneous Fenton catalyst includes the following steps: (1) ammonium leaching treatment of iron-containing waste catalyst after high-temperature calcination to obtain a leachate and a leaching residue; (2) optionally, treating the leaching residue obtained in step (1) with a Fe leaching agent to obtain a catalyst precursor; (3) mixing the leaching residue obtained in step (1) or the catalyst precursor obtained in step (2) with additives and polyoxometalates, molding, drying, and calcining to obtain the heterogeneous Fenton catalyst. This invention utilizes an iron-containing waste catalyst to prepare a heterogeneous Fenton catalyst. The preparation process is simple, not only making full use of the iron-containing waste catalyst, saving resources, and benefiting environmental protection, but also producing a heterogeneous Fenton catalyst with high added value, effectively removing organic matter such as phenol from water.

The invention relates to the technical field of proton exchange membranes, and provides a sulfonated polyether-ether-ketone hybrid proton exchange membrane as well as a preparation method and application thereof. The sulfonated polyetheretherketone hybrid proton exchange membrane provided by the invention comprises a sulfonated polyetheretherketone membrane and a hybridization agent hybridized in the sulfonated polyetheretherketone membrane, the hybridization agent is a covalent grafted polyoxometalate cluster; the covalent grafted polyoxometalate cluster is an absent polyoxometalate cluster grafted by polyethylene glycol monomethyl ether trimethoxy propyl silane. The covalent grafted polyoxometalate is added into the SPEEK membrane as a hybridizing agent, the covalent grafted polyoxometalate has good compatibility with SPEEK, the proton conductivity of the membrane is improved, the vanadium ion permeability of the membrane is reduced, and the mechanical property and dimensional stability of the membrane are improved. In conclusion, the sulfonated polyether-ether-ketone hybrid proton exchange membrane prepared by the method has wide application prospects in the fields of fuel cells, all-vanadium redox flow batteries and the like.

The invention relates to the technical field of solid-state batteries, in particular to a substituted polyoxometallate solid-state electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing phosphotungstic acid hydrate with water, and adjusting the pH value to obtain an H3 [PW11O40] 2-solution; then mixing with soluble copper salt to adjust the pH (Potential of Hydrogen), so as to obtain an H3 [CuPW11O40] solution; and mixing with a lithium salt to adjust the pH value, and carrying out hydrothermal reaction to obtain the electrolyte. According to the method, metal ions are introduced through step-by-step acidification, crystallization is promoted hydrothermally, and a product with a nanorod structure is synthesized, so that the problems of uncertain product structure and low crystallinity of a traditional step-by-step acidification method are solved. The general chemical formula of the electrolyte is Li3CuPW11O40, the electrolyte has a three-dimensional continuous lithium ion transmission path, the ionic conductivity at room temperature reaches 0.9-1.0 mS / cm, and the activation energy is 0.1-0.2 eV. And a continuous lithium ion transmission network can be constructed in a solid-state battery, and the method is suitable for large-scale production.

Methods for cracking a polyolefin are provided which comprise heating a blend comprising a polyolefin and an unsupported acidic polyoxometalate in a reaction zone of a reactor chamber, the reaction zone at a reaction temperature, while flowing a gas through the blend, to induce carbon-carbon bond cleavage in the polyolefin and form a processed blend comprising cracked hydrocarbons; passing at least a portion of the processed blend to a reflux zone of the reactor chamber, the reflux zone at a reflux temperature; and collecting the cracked hydrocarbons.

The invention relates to the technical field of Keggin type polyacid compounds, and particularly discloses a Keggin type polyacid complex modified by a naphthalene diimide ligand as well as a preparation method and application of the Keggin type polyacid complex. The molecular formula of the Keggin type polyacid complex is Cu2 (H2O) 6 [BBPT] 3 [H4W12O40]. 3H2O. The invention also discloses a preparation method of the Keggin type polyacid complex. The Keggin type polyacid complex provided by the invention has excellent photocatalytic activity, when the Keggin type polyacid complex is applied to a photocatalytic CO2 reduction reaction, after illumination is performed for 9 hours, the CO yield is 1781 nmol, the mass normalization CO output rate is 6.59 nmol.mg <-1 >. H <-1 >, the CO product selectivity is about 99.7%, CO2 is efficiently and selectively reduced into CO, and the Keggin type polyacid complex has a wide application prospect in the field of solar-driven CO2 resource utilization.