42 results about "Viologen" patented technology

The invention relates to viologen-anthraquinone composite electrochromic liquid and a preparation method thereof, the viologen-anthraquinone composite electrochromic liquid comprises 1.2-2.5 parts by mole of viologen salt, 0.8-1.5 parts by mole of anthraquinone derivative and 8-12 parts by mole of electrolyte; the viologen salt is ethyl viologen tetrafluoroborate or heptyl viologen tetrafluoroborate or octyl viologen tetrafluoroborate; the anthraquinone derivative is 1-ethylamino-4-hydroxy anthraquinone or acid blue 43; the preparation method comprises the following steps: preparing an electrolyte solution; adding purple refined salt and anthraquinone derivatives according to the formula; fully dissolving the electrochromic material to form uniform and transparent initial liquid; and degassing the initial liquid to remove oxygen dissolved in the initial liquid. The electrochromic liquid has the advantages that after the purple refined salt and the anthraquinone derivative are added into the dissolving solution according to the proportion of the formula, the two color-changing materials are jointly dissolved in the electrolyte, and when the two color-changing materials are reduced at the same time, spectrum superposition absorbed by the two color-changing materials can cover the whole visible region, so that black and white switching of the electrochromic liquid is realized, and the use effect is good.

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 invention discloses viologen electrolyte containing a polycationic additive and a flow battery of the viologen electrolyte. Belongs to the field of flow batteries. According to the viologen electrolyte containing the polycationic additive, the polycationic additive is added into the viologen electrolyte, and the mass fraction of the polycationic additive in the viologen electrolyte is 0.01%-20%. The polycation additive forms dynamic association with a viologen molecule reduction state through multiple mechanisms such as electrostatic induction, cation-pi interaction and molecular chain coating, so that the aggregation and precipitation behaviors of the polycation additive in an aqueous solution are effectively interfered, the dispersion stability of the electrolyte is remarkably improved, and the cycle life of the battery is remarkably prolonged. The polycation additive has good water solubility and electrochemical inertness, and can stably exist in a system for a long time while the conductivity and reaction reversibility of the electrolyte are maintained. The additive is rich in source, simple and convenient to synthesize, low in cost and suitable for large-scale application of viologen flow batteries, and has a wide industrialization prospect and an energy storage market value.

The invention discloses a preparation method and photocatalytic application of a metal viologen derivative framework for catalyzing C-H bond activation oxidative coupling, and belongs to the technical field of photocatalytic materials. In the preparation method, Zn < 2 + > is selected as a metal node, a viologen derivative with an excellent oxygen activation function is selected as a ligand, and a metal viologen derivative framework Zn-bcbpy is obtained through coordination by a solvent evaporation method. The viologen derivative can effectively activate molecular oxygen to generate superoxide free radicals, and then selective activation of C-H bonds is achieved through a hydrogen atom transfer mechanism. Through optimization of reaction conditions, under irradiation of blue light, the reaction yield of the Zn-bcbpy catalytic substrate is 55%, the Zn-bcbpy catalytic substrate can be stably recycled for five times, and good photocatalytic response performance of the catalyst is proved through electrochemical and impedance experiments.

The present application relates to the field of microelectronics, and particularly relates to a single-molecule memristor based on a viologen derivative and a preparation method thereof.The single-molecule memristor based on the viologen derivative comprises an electrode pair and an organic functional molecule, the organic functional molecule is selected from a viologen derivative, and is assembled between the electrode pair through an amide condensation reaction.The organic functional molecule provided by the present application is modified in function on the basis of a viologen molecular structure, effectively reduces the energy barrier of a reversible redox reaction of a viologen unit, and thus significantly improves the performance of the single-molecule memristor;at the same time, the switching ratio of the device is also improved by an order of magnitude.The preparation method provided by the present application can ensure the stability and repeatability of the single-molecule device, and effectively improves the conductive stability and durability of a molecular junction of the organic functional molecule.The method is simple to operate and the reaction conditions are easy to control, and is conducive to realizing the large-scale production of molecular devices.

The present invention refers to an electrolyte comprising a viologen compound or a salt or solvate thereof, wherein each of the nitrogen atoms of the viologen are substituted with one aryl group; wherein said aryl groups are equal or different; and wherein said aryl groups are optionally substituted. The present invention also relates to a redox flow battery comprising the electrolyte of the invention, to an energy storage and / or delivery system comprising said battery, to a method of storing and / or delivering electricity comprising said battery, to the use of said battery, to the use of an energy system comprising said battery and to the use of the use of the viologen compound or a salt or solvate thereof, wherein each of the nitrogen atoms of the viologen are substituted with one aryl group; wherein said aryl groups are equal or different; and wherein said aryl groups are optionally substituted as active species of an electrolyte.

This invention belongs to the field of materials synthesis catalysis, and provides a method for preparing a porous organic polymer-supported catalyst and its application in photocatalytic CO2 reduction. The method involves designing an amide-type POP with redox properties using viologen organic ligands, further synthesizing a series of porous organic polymer-supported Ir and Ru-based catalysts, and applying them to photocatalytic CO2 reduction reactions. The novel pyridine amide catalyst provided by this invention has the advantage of simple synthesis, and the porous organic polymer-supported catalyst synthesized from it has the advantages of novel structure and excellent performance. By introducing Ir / Ru metal, the directional movement of electrons within the framework is promoted, serving as the catalytic center for CO2 reduction, thereby improving the utilization rate of visible light and the efficiency of photocatalytic CO2 reduction.

The application provides a thermosetting viologen electrochromic solution and an electrochromic device. The thermosetting viologen electrochromic solution comprises the following components at the following concentrations: 1.5-4.5 g / mL of a diepoxy functional group molecule, 0.5-0.8 g / mL of an anhydride curing agent, 0.1-0.4 g / mL of a viologen compound, and 0.05-0.3 g / mL of a counter electrode material; the diepoxy functional group molecule is at least one selected from bisphenol f diglycidyl ether, bisphenol a diglycidyl ether and bisphenol s diglycidyl ether. The electrochromic device comprises a solid electrochromic layer formed by curing the thermosetting electrochromic solution. The application optimizes the formula, so that the electrochromic solution can achieve thermal curing while ensuring good electrochromic performance, solves the problems of easy leakage and poor safety of the viologen electrochromic device, and can be thermally cured and formed, avoiding the potential adverse effects of the ultraviolet curing method on the performance of the device.

The application discloses a synthesis method of an aldehyde group-containing N-arylated viologen molecule, and the method adopts a Nesmeyanov reaction to prepare the aldehyde group-containing N-arylated viologen molecule by reacting a pyridine compound and an asymmetric iodonium molecule containing an aldehyde group. The synthesis method provided by the application is simple in process, easy to purify, high in yield and strong in universality. The prepared molecule has excellent electrochemical performance and electrochromic performance. The introduction of the aldehyde group further expands the space of modification, provides unlimited possibilities for constructing various functional materials containing viologen, and is expected to be applied to multiple fields such as electrochromic, optical chromic, energy storage, adsorption, supramolecular chemistry, catalysis and sensing.

The invention belongs to the field of new energy materials, and particularly relates to a viologen electrolyte with multi-electron transfer capability, a preparation method and application of the viologen electrolyte in an aqueous organic flow battery. The preparation method comprises the following steps: reacting triethanolamine with phosphorus tribromide to generate a tris (2-bromoethyl) amine intermediate, condensing the tris (2-bromoethyl) amine intermediate with 4, 4 '-dipyridyl to generate a trinuclear viologen precursor, and finally performing quaternization and anion exchange to obtain a target product. The solubility of the prepared viologen electrolyte in an aqueous solution reaches up to 1.82 M, the theoretical charge capacity is 103 Ah L <-1 >, and the viologen electrolyte can perform highly reversible multi-electron redox reaction and shows excellent electrochemical performance. When the material is applied to the aqueous organic flow battery as a negative electrode active material, the battery shows the outstanding advantages of high coulombic efficiency, high energy density, long cycle life and the like.

This invention discloses a parallel-interface engineered viologen-based defective carbon nitride composite material, its preparation method, and its applications, belonging to the field of energy catalysis and photochemical materials technology. The material comprises: a defective graphitic carbon nitride support; single-atom platinum catalytic sites supported on the support; and a selenium-containing viologen compound anchored by covalent bonds in a configuration parallel to the support surface. Through a bilateral covalent bonding strategy, viologen molecules are stably anchored in a parallel configuration to the single-atom platinum-modified defective carbon nitride surface, constructing a highly efficient and stable "electron bridge" structure, significantly enhancing interfacial bonding and photogenerated electron transport efficiency. This composite material exhibits excellent photocatalytic hydrogen evolution activity and efficient coupling ability with benzylamine oxidation under visible light, and its activity retention rate reaches over 92% after 144 hours of cycling. It provides a new paradigm for solving the problem of poor interfacial stability in photocatalysts and has significant application prospects in the field of solar fuel synthesis.

This invention discloses a homogeneous mixed redox electrolyte and an aqueous organic flow battery, belonging to the field of organic flow battery technology. The homogeneous mixed redox electrolyte can be used as either the positive or negative electrode. The positive electrode electrolyte incorporates at least two cyclic nitrile radical-based active materials, and the negative electrode electrolyte incorporates at least two viologen-based active materials. By introducing derivative molecules of the same type but different substituents or bridging atoms into the positive and negative electrode electrolytes, and utilizing the same charged groups or atoms in the substituents, the intermolecular distance is increased through electrostatic repulsion or weak interactions such as hydrogen bonds to stabilize the molecular structure, regulate the molecular distribution in solution, reduce molecular aggregation, and improve battery capacity and cycle stability. The introduction of charged active materials can enhance the battery's rate performance, facilitating higher power density and providing new ideas for the design and application of high-performance aqueous organic flow batteries.

This invention relates to the field of energy storage battery electrode technology, and discloses a highly stable organic polymer electrode, its preparation method, and a battery using the same. The electrode is composed of a bisvioletin side-chain functionalized polyaryl ether compound and nitrogen-doped carbon nanotubes. The organic polymer electrode of this invention, containing a bisvioletin side-chain functionalized polyaryl ether compound, has advantages such as high viologen content, high theoretical specific capacity, high thermal stability, and good flexibility. Sodium-ion batteries using this highly stable organic polymer electrode also exhibit high charge-discharge capacity and excellent cycle stability.

The application discloses an asymmetric viologen compound and application thereof in water-based flow batteries, and particularly relates to the following steps: taking 4,4'-dipyridine and iodomethane as starting materials, introducing hydrophilic groups such as phosphonic acid groups, sulfonic acid groups or quaternary ammonium salts into both ends of the dipyridine through two-step alkylation, and obtaining a high-purity target product after ion exchange. The derivative has high water solubility (>1.3 mol / L), low transmembrane permeability, a suitable redox potential and excellent electrochemical reversibility. The asymmetric viologen compound is used as a negative electrolyte active molecule, the TEMPO derivative is used as a positive electrolyte active molecule, a neutral salt is used as a supporting electrolyte, a titanium plate or a graphite plate is used as a current collector of the positive and negative electrodes, a graphite felt or a carbon felt is used as the positive and negative electrodes, a commercial anion exchange membrane is used between the positive and negative electrolytes, and a water-based flow battery is assembled. The preparation process is simple, raw materials are cheap and easy to obtain, and the application is suitable for large-scale energy storage systems.

The invention discloses transparent-green electrochromic hydrogel based on viologen derivatives as well as preparation and application of the transparent-green electrochromic hydrogel. The viologen derivative is shown as a formula (I), and a novel viologen derivative electrochromic material is synthesized by researching and developing a specific substituent to modify the N site of viologen. The viologen derivative is assembled into sodium carboxymethyl cellulose hydrogel, the hydrogel with the electrochromic property is obtained, the hydrogel is in a high-transmittance state in a neutral state, when external voltage is applied, the absorption peak value is obviously increased, the hydrogel is green in a reduction state, and the application prospect in the electrochromic field is wide; (I).

The invention discloses an imidazolium functionalized viologen derivative as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The core is that a 1, 2-dimethylimidazolium functional group is introduced to a viologen skeleton. According to the molecular design, through steric hindrance and an electrostatic shielding effect, intermolecular pi-pi accumulation and ionic association under high concentration are remarkably inhibited, so that high water solubility is realized, and meanwhile, the viscosity of the electrolyte is effectively controlled. The invention also provides a preparation method of the derivative. When being used as an active substance for an aqueous organic flow battery negative electrode electrolyte, the composite material shows high volume energy density, high power density, excellent rate capability and long cycle stability. According to the invention, the technical bottleneck that the viscosity of the traditional viologen derivative is greatly increased under high concentration is solved.

The invention discloses a polyacid cluster catalyst based on PAFs confinement self-reduction as well as a preparation method and application thereof, and belongs to the technical field of catalytic chemistry. The polyacid cluster catalyst is prepared by loading polyacid clusters in pores of PAFs through an impregnation method; wherein the PAFs is a porous skeleton containing a viologen cation group; the skeleton of the polyacid cluster is an anion skeleton. The catalyst provided by the invention has high heteropoly acid loading capacity, and nitrogen atoms on a PAFs skeleton can realize partial reduction of phosphomolybdic acid so as to improve the catalytic performance of the catalyst; the polyacid clusters are immobilized into the gaps of the PAFs, so that the uniform distribution of the molecular level of the polyacid clusters can be realized; the heterogeneous combination of the PAFs and the polyacid clusters can also be used for compounding heterogeneous photon-generated carriers, so that the photocatalytic performance is improved. The catalyst can be used as a heterogeneous photocatalyst, has outstanding catalytic performance in a reaction for catalytically degrading pollutants in a water body, and especially can complete the degradation efficiency of 85% or above within 70 min in a reaction for catalyzing tetracycline degradation.

The invention discloses a negative electrode material, a lithium ion battery and a formation method of the lithium ion battery, and relates to the technical field of lithium ion batteries. The negative electrode material comprises the following components in parts by weight: 90-96 parts of a negative electrode active material, 1-5 parts of a conductive agent, 0.5-1.5 parts of a dispersing agent, 1-3 parts of a binder and 0.5-1.2 parts of carboxylic acid group viologen. The negative electrode material provided by the invention can significantly improve the problem of poor cycle performance of a lithium ion battery at a low temperature.

This invention discloses a viologen-based electrochromic polymer, its preparation method, and its applications. The polymer has the chemical structure shown in Formula I. The polymer material of this invention can form a uniform thin film on a conductive substrate surface through electrochemical polymerization. When applied in electrochromic supercapacitors, it can achieve reversible color changes to visually reflect the energy storage state, while also possessing high specific capacitance and good cycle stability. This provides a new material option for the integration and practical application of electrochromic energy storage devices.

The application discloses a conjugated extended asymmetric viologen derivative, a preparation method and application thereof, and the viologen derivative comprises a compound shown in a general formula (I): wherein Ar is one of 1,4-phenylene, 1,5-naphthylene, anthracene, pyrene, tetramethylphenylene and tetrafluorophenylene; R1 is one of propionic acid, hexanoic acid, octanoic acid and 3-ethoxypropionic acid; and R2 is one of dodecyl, hexadecyl, octadecyl and 2-hexyldecyl. The application effectively solves the technical problems of a wide energy gap, a low conjugation degree, poor light emitting performance of a viologen electrochromic material in the prior art, and a fragile assembly structure and single performance of a viologen-pyrenium system.

This invention discloses a class of chiral viologen derivatives for improving electrolyte solubility, their synthesis method, and their application in flow batteries, belonging to the field of flow energy storage technology. This invention prepares optical isomers and racemates through a chiral resolution strategy, which can improve the solubility of viologen molecules. Simultaneously, the introduction of dihydroxyl groups increases the number of hydrogen bonds between the molecule and water. This approach significantly improves the water solubility of the molecule and enhances the theoretical capacity and volumetric energy density of the electrolyte. It can be used in high-capacity, high-power, long-life neutral aqueous organic flow batteries, making it highly suitable for large-scale energy storage.

The invention provides a zwitterionic electrolyte additive suitable for a viologen-based aqueous organic flow battery, an electrolyte and a battery. The invention relates to the technical field of flow batteries, in particular to a zwitterionic electrolyte additive suitable for a viologen-based aqueous organic flow battery, an electrolyte and a battery. The additive is of a monomolecular amphoteric structure, and contains a cationic group and an anionic group at the same time; the anionic group can generate electrostatic interaction with viologen cations, and the cationic group can interact with a free radical or lone pair electronic structure in a viologen reduction state to synergistically inhibit pi-pi accumulation. When the additive is added into the electrolyte, viologen can be effectively prevented from being gathered and precipitated, the cycling stability is improved, and the electrochemical reversibility is not influenced. The electrolyte comprises a viologen compound, a supporting electrolyte, a solvent and the additive, is preferably used for a negative electrode side, remarkably reduces the capacity fading rate, and is suitable for a high-performance aqueous organic flow battery system.

The application discloses a kind of based on organic polymer-silica synergic modification porphyrin electrochromic device and preparation method thereof, it relates to a kind of electrochromic device and preparation method thereof.The application is to solve the problems that porphyrin electrochromic electrolyte is easily led to the entanglement of polymer chain by using single organic polymer modification, ion transmission is blocked, conductivity is limited to improve, and using single silica modification is easily agglomerated, interface compatibility with porphyrin solution is poor, and cannot continuously improve response speed.The device is sequentially from bottom to top first substrate, first conductive layer, electrochromic layer, second conductive layer and second substrate;Method: one, the preparation of device cavity frame;Two, the preparation of gel;Three, the preparation of electrochromic gel;Four, electrochromic gel is filled into device cavity frame, finally heat treatment.The application is used for based on organic polymer-silica synergic modification porphyrin electrochromic device and preparation.

The invention relates to a folded viologen compound, a preparation method thereof and application of the folded viologen compound in an aqueous flow battery. The invention provides and synthesizes a class of double viologen compounds with'folding 'spatial conformation for the first time. The molecule is covalently connected with two viologen units through a flexible bridging group, so that the molecule can carry out efficient two-electron storage and also can carry out efficient reversible two-electron reaction, and the volume energy density of a battery is favorably improved. More importantly, in a two-electron reduction state, free radicals generated on the two viologen units can be subjected to intramolecular or intermolecular interaction (such as forming a free radical-free radical bond) through space approaching, so that the reaction activity of a substance in the reduction state is remarkably reduced, the reaction rate of the substance with oxygen is slowed down, and the oxygen-oxygen conversion efficiency is improved. And the stability of the electrolyte in the air is fundamentally improved. The preparation method provided by the invention has the advantages of simple steps, high yield, high product purity and good application prospect.

This invention discloses an electrochromic device and its fabrication method. The electrochromic device includes an electrochromic layer and a first electrode layer and a second electrode layer acting on two opposite surfaces of the electrochromic layer. The electrochromic layer is made of viologen, and the first electrode layer and / or the second electrode layer contains a transition metal material selected from one or more of nickel, copper, silver, palladium, zinc, molybdenum, niobium, and palladium. This invention uses a transparent conductive film based on a transition metal (such as nickel or palladium) that readily donates electrons, greatly increasing the duration of the colored state without affecting the conductivity, thus achieving large-area, uniform, and rapid color change.

The application discloses a crystal material based on a cadmium-viologen complex, a preparation method and application of the crystal material. II (Btybipy)Cl4; wherein Btybipy is a double 1-(thienyl)-3-methyl-4,4'-bipyridyl-1-onium. II The application is connected with a cadmium-viologen complex with chlorine as a counter anion to form a zero-dimensional crystal material. (Btybipy)Cl4 is a zero-dimensional structure, and has the advantages of simple synthesis method and convenient purification; the viologen compound is used as a nitrogen-containing ligand, the viologen ligand has good water solubility, is beneficial to crystallization of the crystal material, and improves a synthesis yield; the synthesized crystal material is sensitive to light and a solvent, can occur a photochromic phenomenon, and can be applied as an ion sensing material.

The invention discloses an N-ortho-position modified viologen electrochromic material, which is characterized in that an n-butyl or phenyl substituent group is introduced to the N-ortho position of a pyridine ring of ethyl viologen, so that the viologen electrochromic material is formed; the structural general formula of the viologen electrochromic material is as follows: 2, 2 ', 6, 6'-tetrasubstituted (R)-1, 1 '-diethyl-[4, 4'-bipyridyl]-1, 1 '-dionium hexafluorophosphate, wherein R is n-butyl or phenyl. The invention further discloses a preparation method and application of the N-ortho-position modified viologen electrochromic material. By introducing an n-butyl or phenyl substituent to the N-ortho position of a pyridine ring of ethyl viologen, the electrochemical cycle stability of the material is remarkably improved, and the key problem that the viologen material is prone to photooxidative degradation in long-term electrochemical cycle is solved.

The application discloses a negative electrode composite material and a preparation method and application thereof, and belongs to the technical field of battery materials.The negative electrode composite material comprises a negative electrode active material and graphite; the negative electrode active material comprises a silicon-based material, a soft carbon coating layer coated on the surface of the silicon-based material, and a polymer coating layer coated on the outer surface of the soft carbon coating layer; the polymer coating layer is obtained by esterification reaction grafting of carboxyl in a viologen compound and hydroxyl on the surface of the silicon-based material and hydroxyl on the surface of the soft carbon coating layer; the polymer in the polymer coating layer has a self-polymerization reaction in the charging and discharging cycle process of an electrochemical device, and has a self-repairing performance; and the negative electrode composite material provided by the application improves the cycle performance of a secondary battery by coating the viologen compound containing carboxyl on the outer surface of the silicon monoxide with the soft carbon coating to form the polymer coating layer.

The application provides a freezing history indicator, which comprises a diaryl viologen and a guanidine macrocycle, the diaryl viologen has a structure as shown in the figure, R is a methanethiol group, a methoxy group, a nitrogen-nitrogen dimethyl group or other electron-donating groups, and the guanidine macrocycle has a structure as shown in the figure; the freezing history indicator has low cost, can indicate the sample alone after being packaged, and has obvious fluorescence color contrast before and after freezing; the fluorescence color remains unchanged after the indicator is recovered to normal from freezing, and the indicator does not recover to the normal state before freezing, so that the display effect is good, and whether the substance has experienced the freezing process can be clearly indicated; the technology is based on materials with low cost, small dosage, easy preparation and portable labels, and can be used for following the product to detect the freezing history of the whole logistics process.

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a preparation method and application of an ion-electron coupled high-activity graphite felt electrode. The preparation method comprises the following steps: taking PDDA (poly (diallyldimethylammonium chloride)) containing nitrogen positive ions as an ion active component and a binder, and tightly attaching CNTs (carbon nanotubes) as an electronic active component to the surface of graphite felt fibers, so as to obtain the ion-electron coupled high-activity graphite felt electrode PDDA-CNTs-GF. The PDDA-CNTs can obviously increase the electrochemical active area and the electrocatalytic activity of the graphite felt. When the PDDA-CNTs-GF is applied to the viologen-based aqueous organic flow battery, the electrode reaction kinetics can be effectively improved, and the battery performance is improved. The method disclosed by the invention is simple, low in cost, suitable for large-scale production and beneficial to promoting the development of a novel energy storage system, and has a wide application prospect.