132 results about "Polyoxometalate" patented technology

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a metal organic framework packaged polyoxometallate coated ternary positive electrode material and a preparation method thereof. The preparation method of the ternary positive electrode material comprises the following steps: a) preparing metal A salt into a metal A salt solution; the preparation method comprises the following steps: preparing an ammonium molybdate compound into an ammonium molybdate compound solution, heating the ammonium molybdate compound solution to boiling, dropwise adding a metal A salt solution, and after dropwise adding, carrying out a constant-temperature reaction, filtering and recrystallizing to obtain Anderson type polyoxometallate; b) dissolving Anderson type polyoxometallate, a metal B salt and an organic ligand in water, and reacting at a certain temperature to obtain polyoxometallate packaged by a metal organic framework; and c) mixing a positive electrode material and the polyoxometallate packaged by the metal organic framework prepared in the step b) according to a ratio, and carrying out ball milling to obtain the ternary positive electrode material coated by the polyoxometallate packaged by the metal organic framework.

The present disclosure provides a process for the separation and purification of radium and actinium from acidic solution using composite adsorbents. The process includes preparing polyoxometalates (POMs)-based mesoporous composite metal-infused resins using phosphate recovered from waste buffer solution. The resins are prepared using a modified sol-gel technique to form inorganic composite metal-oxide clusters. Embodiments of the resins include silica-coated composite metal oxide particles, including antimony-vanadium oxide particles, and tungsten-doped mesoporous titanium oxide particles. The resins have differing adsorption affinities for actinium, radium, and other metal ions and may thus be utilized for selectively separating radium and actinium from irradiated thorium targets.

The present invention relates to a battery comprising an electrochemical cell for electrical energy storage (EES), which is capable of operating in an electrical energy delivery mode in which it generates electrical energy by oxidation of a redox active species and reduction of oxygen in an oxygen reduction reaction (ORR) and eventually in an electrical energy storage mode in which it consumes electrical energy to reduce a redox active species and generates oxygen in an oxygen evolution reaction (OER), wherein the electrochemical cell is a hybrid redox flow cell comprising a negative half-cell (1), a positive half-cell (2), a negolyte (3A) with a polyoxometalate (POM) as redox active species in the negative half-cell (1), a membrane (4) disposed between the negative half-cell (1) and the positive half-cell (2), a negative electrode (5) in the negative half-cell (1), a positive electrode (6) in the positive half-cell (2), characterised in that the polyoxometalate (POM) is capable of multiple electron transfer, an inlet (7) and an outlet (8) connect the negative half-cell (1) with an electrolyte tank (9) via conduits (10) equipped with a pump (11), so that the battery may be charged by provisioning the tank (9) with charged negolyte, or recharged by replacing discharged negolyte with charged negolyte, the positive electrode (6) is equipped with an oxygen reduction reaction (ORR) and eventually an oxygen evolution reaction (OER) catalyst or with a bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).

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 belongs to the field of photocatalyst and precious metal recovery, and particularly relates to a method for recovering precious metal through photocatalysis. Comprising the following steps: under an illumination condition, in an oxygen-containing environment, in a first solvent added with polyoxometallate and a noble metal-containing material, catalyzing the dissolution of noble metal in the noble metal-containing material by the polyoxometallate to generate a noble metal organic or inorganic coordination compound, so as to obtain a first reaction solution; and polyoxometallate obtained after liquid removal of the first reaction liquid and a precious metal organic or inorganic coordination compound are placed in water containing an electron sacrificial agent, and reduced and recycled precious metal is obtained under the illumination condition. According to the method, polyoxometallate is adopted as the catalyst, the method can be carried out under the illumination condition, no toxic solvent is needed, heavy metal pollution and secondary ecological risks are avoided from the source, the precious metal recovery rate is high, economical efficiency and environmental friendliness are high, and the application prospect is wide.

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.

A polyoxometalate compound with a polyoxometalate cluster includes Group 5 elements. A formulation is provided that includes the polyoxometalate compound, and a method is provided for preparing an optical metal oxide layer using the formulation and polyoxometalate compound. The obtained optical metal oxide layers are particularly suitable for applications in optical devices such as, for example, in augmented reality (AR) and / or virtual reality (VR) devices.

The invention belongs to the technical field of catalysts, and particularly relates to a Cu-POM type catalyst and a preparation method and application thereof. The Cu-POM type catalyst provided by the invention is Anderson type polyoxometallate taking Cu as the center, and the Cu-POM type catalyst is prepared by connecting metal element copper with the polyoxometallate through the steps of oil bath, filtration, crystallization and the like. The Cu-POM prepared by the invention is used as a catalyst for esterification reaction, and has the advantages of low cost, simple synthesis conditions, low toxicity and the like; the catalyst is used for catalyzing ester synthesis, the yield is high, high catalytic efficiency can be achieved, the green and environment-friendly principle is met, meanwhile, Cu-POM has high stability and high activity, and multi-batch recycling can be achieved.

The invention discloses an MOFs confinement platinum-molybdenum-based polyacid cluster catalyst and a precise preparation method and application thereof. The catalyst comprises zirconium-based MOFs, a Pt-containing molybdenum-based polyacid cluster or a Pt-free molybdenum-based polyacid cluster is dispersed in a pore channel of the zirconium-based MOFs, and Pt is deposited on the Pt-free molybdenum-based polyacid cluster. The catalyst has the characteristics of high atom utilization rate, mild reaction conditions, high carbon dioxide conversion rate, excellent stability and high methanol selectivity, shows better performance than commercial CuZnAl2O3 under the same conditions, and has wide industrial application prospects.

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 invention discloses a transition metal doped polyoxometallate cluster as well as a preparation method and application thereof. The chemical formula of the transition metal doped polyoxometallate cluster is Na34 [Co19 (OH) 12 (SiW10O37) 6]. 46H2O, and the molecular structure unit of the transition metal doped polyoxometallate cluster comprises [Co19 (OH) 12 (SiW10O37) 6] 34-subunit, 34 sodium ions and 46 lattice water molecules, wherein the [Co19 (OH) 12 (SiW10O37) 6] 34-subunit is centrosymmetric; the subunit is composed of a giant [Co19 (OH) 12] 26 < + > nanosheet and six [alpha-SiW10O37] 10 <-> in a coordination manner. The invention provides a transition metal doped polyoxometallate cluster containing a [Co19 (OH) 12] 26 < + > subunit, and the transition metal doped polyoxometallate cluster shows excellent OER (Optical Error Rate) 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.

The invention belongs to the technical field of synthesis of functional crystalline compounds, and discloses a rare earth-polyacid-based compound as well as a preparation method and application thereof. The chemical formula of the rare earth-polyoxometalate compound is [Dy (DMF) 8] [PMo12O40], and the cell parameter is # imgabs0 #. The preparation method comprises the following steps: sequentially adding an H3 [PMo12O40] solution as a lower solution, an organic solvent as a middle buffer layer solution and a mixed solution of Dy (NO3) 3.6 H2O and 4-hydroxyazobenzene-2-carboxylic acid as an upper solution C into a container, keeping a layered state, standing until crystal particles appear on the middle layer of the container, and drying to obtain the rare earth-polyoxometalate compound. The crystal particles are the rare earth-polyacid group compound. The material has excellent electro-catalysis characteristics and can be applied to detection and oxidation reduction of nitrite.

The present invention relates to the technical field of lithium-ion battery materials, and specifically relates to a polyoxometalate intercalated hydrotalcite aramid-coated lithium-ion battery separator and a preparation method thereof. The preparation method is as follows: preparing polyoxometalate intercalated hydrotalcite by a peeling and recombination method: adding hydrotalcite into formamide, vigorously stirring under the protection of an inert gas to obtain a suspension, centrifuging the suspension to obtain exfoliated hydrotalcite lamellae, then adding a polyoxometalate aqueous solution to the exfoliated hydrotalcite lamellae and stirring for self-assembly, and finally performing solid-liquid separation to obtain polyoxometalate intercalated hydrotalcite; mixing the polyoxometalate intercalated hydrotalcite with an aramid slurry uniformly to obtain a polyoxometalate intercalated hydrotalcite aramid-coated slurry; coating the polyoxometalate intercalated hydrotalcite aramid-coated slurry on the surface of a base film, passing through a coagulation bath and then drying to obtain a polyoxometalate intercalated hydrotalcite aramid-coated lithium-ion battery separator. The lithium-ion battery separator has higher thermal stability, and the preparation method is simple and has strong practicability.

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.

The invention belongs to the technical field of fuel cells, and discloses a Preyssler type polyacid crystalline material with high proton conductivity, the structural formula of the Preyssler type polyacid crystalline material is [Zn4 (H2O) 8 (H7P5W30O110) (btp) 4]. 6H2O, and the asymmetric unit of the Preyssler type polyacid crystalline material comprises an independent Zn (II) ion, a quarter {P5W30} unit, two half btp ligands, two coordinated water molecules and two free water molecules. The compound is a proton conduction material with great potential, the proton transmission mechanism of the compound and the proton transmission mechanism of the composite membrane follow a jumping mechanism, and the stable three-dimensional frame structure of the compound is beneficial to large-scale commercial application of proton exchange membrane fuel cells.

The invention is suitable for the technical field of adsorption materials, and provides a preparation method and application of an ion skeleton with selective adsorption. According to the invention, a series of ion skeletons with microporous structures are constructed by using the Anderson type polyoxometalate modified by the triol ligand and Na < + >, and the skeletons show excellent heat, humidity and organic solvent stability and are very suitable for being used as gas adsorbents. Especially, the composite material shows very strong adsorption capacity on SO2, NH3 and other polar bond gases, almost has no adsorption on non-polar or weak-polar gases, and shows high selectivity. The invention not only provides a new material and thought for selective adsorption of gases with polar bonds, is expected to be further expanded to adsorption treatment of more toxic gases, but also remarkably widens the application range of the polyoxometalate in the field of gas adsorption, and points out a new direction for development of innovative gas adsorbents.

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.

The application discloses a perovskite phase additive, a perovskite thin film, a solar cell and a preparation method, a battery assembly and a power utilization device thereof. The perovskite phase additive comprises a heterometallic substituted polyoxometalate. The perovskite thin film and the perovskite active layer of the solar cell are doped with the perovskite phase additive. The heterometallic substituted polyoxometalate utilizes adjustable energy levels, multi-site coordination and gradient redox activity, can realize the synergistic effect of defect passivation, crystallization regulation and stability improvement of the perovskite thin film, and thus improves the photoelectric efficiency and working stability of the device.

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.

The present invention discloses a two-dimensional polyoxometalate nanomaterial and a preparation method and application thereof. The two-dimensional polyoxometalate nanomaterial has a lamellar structure, and the lamellar structure is composed of polyoxometalate clusters arranged in a hexagonal shape. The material has good electron transmission capability and excellent thermal / chemical stability, and at the same time has a porous lamellar structure and a large specific surface area. When applied to a photodetector, it has excellent photoelectric detection performance in different acid-base environments, exhibits excellent photoelectric response speed, and has good long-term stability in harsh application environments.

The invention belongs to the field of energy storage, and particularly relates to a high-performance NASICON type oxide electrolyte and a preparation method thereof. The electrolyte takes an NASICON type oxide as a matrix and contains polyoxometallate accounting for 0.1-20% wt of the NASICON type oxide, the electrolyte can effectively improve the sodium affinity and intrinsic ionic conductivity of the NASICON solid electrolyte, and the interface impedance of the prepared sodium symmetric half cell at room temperature is smaller than 20 omegacm < 2 > and is as low as 16.7 omegacm < 2 >. According to the invention, the reaction between the NASICON and the additive is more uniform by adding the polyoxometallate in situ, a uniform and stable structure is formed, and the sodium ion conductivity of the NASICON solid electrolyte is effectively improved.

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.

The utility model relates to the technical field of vacuum distillation, and discloses a polyzirconoxane vacuum distillation device which comprises a fixing plate, the top of the fixing plate and the top of a refrigerant fluid storage box are fixedly connected with a water suction pump, the top of the fixing plate is fixedly connected with a distillation barrel, and the right side of the exterior of the distillation barrel is fixedly connected with a condensation assembly. A collecting tank is fixedly connected to the right side of the exterior of the condensing assembly, a supporting column is fixedly connected to the top of a fixing plate, a purifying assembly is fixedly connected to the front side of the collecting tank, a heating assembly is fixedly connected to the top of the fixing plate, and a water blocking plate is fixedly connected to the inner wall of the collecting tank. According to the utility model, the refrigerating fluid in the refrigerating fluid storage tank is pumped by the water pump, so that the condensing pipe is cooled, water vapor is quickly condensed into fluid, the fluid flows into the collecting tank and flows into the bottom of the tank through layer-by-layer drainage of the water blocking plate, and meanwhile, the water blocking plate plays a role in blocking the re-evaporation of the condensed polyzirconoxane fluid.

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.