122results about "Electrolytic organic material coating" patented technology

The invention discloses a bionic lantern frame composite internal fixing device and a preparation method, and relates to the technical field of orthopedic medical instruments, the bionic lantern frame composite internal fixing device comprises an implant and a multi-rod bridging structure, the multi-rod bridging structure is composed of a plurality of longitudinal connecting rods and transverse locking nails, and the implant is composed of a plurality of multi-level bionic structures; the multi-layer bionic structure comprises two hexagonal upper and lower layer structures which are symmetrically arranged and a middle spiral layer structure arranged between the two hexagonal upper and lower layer structures. According to the invention, inspired from honeycomb and ox horn macro-microstructure, the multi-level bionic structure prepared by adopting a coupling bionic technology has excellent mechanical properties and strong buffering and vibration absorbing capabilities, can be effectively matched with the mechanical properties of natural bones, and can effectively avoid secondary injury and stress shielding effect after implantation of a patient; the composite coating introduced through an electrochemical deposition method solves the problems that a single implant structure is insufficient in biocompatibility, insufficient in antibacterial property and weak in osteogenic differentiation capacity.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

A system includes a wire-holding fixture configured to be received in an EP station. The wire-holding fixture comprises terminals, and each terminal is electrically coupled to a respective working wire of a plurality of working wires. The working wires extend away from the wire-holding fixture. A set of EP stations is included, and each EP station is configured to receive the wire-holding fixture. A container is configured to hold an electropolymerization solution and positioned beneath the EP station such that the working wires is immersible. A board comprising a plurality of electrical contacts is included, and each electrical contact is configured to electrically engage a corresponding terminal. A controller is configured to apply a voltage to the working wires through the respective terminals and electrical contacts to initiate electropolymerization of the material from the electropolymerization solution to form a polymer layer on each working wire.

The application discloses a preparation method of a high-density and high-stability conductive polymer film based on electrochemical polymerization, and comprises the following steps: using an oxidant solution and a BFDO monomer solution to pretreat a formed foil to obtain a working electrode, then immersing the working electrode and a reference electrode into an electrolyte to perform electrochemical oxidation polymerization, and obtaining the high-density and high-stability conductive polymer film based on electrochemical polymerization. The pretreated formed foil containing N-type conductive polymer PBFDO is prepared by using a chemical in-situ polymerization method on the formed foil, and when the pretreated formed foil is applied in the field of capacitors, the conductivity and electron transport capacity of the capacitor can be improved, and the stability problem caused by the coupling of positive and negative charges in the traditional capacitor is greatly improved.

The invention belongs to the technical field of carbon fiber surface treatment, and particularly relates to a cross-linked polymer modified carbon fiber, a preparation method and a composite material. Aiming at the problem of insufficient interface bonding force between the existing polyarylsulfone / ketone thermoplastic sizing agent and the carbon fiber, the core of the invention is to apply a polyarylsulfone / ketone derivative of which a main chain or a side chain is provided with an electrochemically crosslinkable active group to the technical field of carbon fiber surface treatment. And constructing a covalent bond combined three-dimensional network structure coating on the surface of the carbon fiber in situ. According to the method, firm anchoring of the coating and the carbon fibers is achieved, and the interface load transmission efficiency and the interlayer shear strength of the carbon fiber / polyether-ether-ketone composite material can be remarkably improved. The method is mild in process condition, easy in parameter control and convenient in post-treatment, meets green manufacturing requirements, and has remarkable large-scale production advantages.

The invention discloses a method for coating a Ca-Cur submicron modified material-doped PLA layer on the surface of an Ag-DCPD film layer, and relates to the technical field of biological coatings on the surfaces of medical materials. The method comprises the following steps: manufacturing an LPBF-NiTi alloy matrix by adopting a laser powder bed melting additive manufacturing technology, and carrying out pretreatment on the LPBF-NiTi alloy matrix; the pretreated LPBF-NiTi alloy matrix is subjected to electrochemical deposition in an electrolyte solution, and the LPBF-NiTi alloy matrix with the deposited Ag-DCPD film layer is obtained; the preparation method comprises the following steps: dissolving CaCl2 and curcumin in absolute ethyl alcohol, putting the solution into a closed container filled with (NH4) 2CO3, and carrying out constant-temperature reaction to obtain a Ca-Cur submicron modified material; polylactic acid is dissolved in dichloromethane, then the Ca-Cur submicron modified material is dispersed in the dichloromethane, and a leaching solution is obtained; and the LPBF-NiTi alloy matrix on which the Ag-DCPD film layer is deposited is subjected to repeated dipping and pulling in the leaching solution, and the LPBF-NiTi alloy matrix coated with the Ag-DCPD / PLA / Ca-Cur composite film layer is obtained. According to the invention, the corrosion resistance, the biocompatibility and the antibacterial and anti-inflammatory performance of the Ag-DCPD film layer are successfully improved.

The invention belongs to the technical field of photo-thermal evaporation materials, and discloses a composite photo-thermal material Fe / PANI / GF and a preparation method and application thereof. The preparation method of the composite photo-thermal material Fe / PANI / GF comprises the following steps: taking graphite felt (GF), and activating at high temperature to obtain activated graphite felt; uniformly depositing polyaniline on the surface of the activated graphite felt by adopting a constant current method or a cyclic voltammetry to obtain acid-doped polyaniline (PANIES / GF); and dipping the acid-doped polyaniline in a ferric salt solution or a ferrous salt solution, and dispersing and loading Fe on the PANI nano-particle layer through Fe-N coordination to obtain the composite photo-thermal material Fe / PANI / GF. The method shows wide application prospects in the fields of seawater desalination, high-salinity wastewater treatment, heat-assisted power generation, photo-thermal driven sterilization, soil remediation and the like, and an innovative scheme is provided for solving the problems that a traditional photo-thermal material is low in efficiency, poor in stability, high in cost and the like.

To provide a biocompatible article by grafting an organic coated film onto a conductive or semi-conductive surface.SOLUTION: There is provided a biocompatible article containing an organic coated film acceptable for ionic transportation with a conductive or semi-conductive surface or a part of the surface, electrically grafted to the surface or the part thereof, and electrically grafted to the surface or the part thereof by electric reduction of a solution containing at least one kind of diazonium salt, and a chain polymerizable functional group, and at least one kind of macro article which is a precursor material of the organic coated film.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of a bipolar plate composite coating based on a high-entropy alloy and a conductive polymer, which comprises the following steps: firstly, electro-depositing a layer of high-entropy alloy coating on the surface of a pretreated bipolar plate, and then continuously carrying out electro-polymerization to prepare a polymer coating, thereby forming the composite coating. Through the mode, according to the preparation method of the bipolar plate composite coating based on the high-entropy alloy and the conductive polymer, the comprehensive performance such as corrosion resistance and conductivity of a bipolar plate is effectively improved, the performance requirement for a metal bipolar plate is met, and the preparation method has a wide application prospect in the field of corrosion protection.

The invention relates to a multi-dimensional regulation metal organic framework composite electrode and a preparation method and application thereof, and the preparation method comprises the following steps: (1) placing a substrate in an electroplating solution, and carrying out pulse electrochemical deposition on the substrate to obtain a metal organic framework composite precursor; (2) putting the metal organic framework composite precursor obtained in the step (1) into conductive filler dispersion liquid, and performing ultrasonic treatment to obtain a metal organic framework composite precursor loaded with conductive filler; and (3) carrying out heat treatment on the metal organic framework composite precursor loaded with the conductive filler obtained in the step (2) to obtain the multi-dimensional regulation metal organic framework composite electrode, the on-off time ratio Ton / Toff of the pulse electrochemical deposition in the step (1) is (1-3): 1. The structure of the composite electrode is regulated and controlled through a pulse electrochemical deposition process, the composite electrode with excellent conductivity, high electrocatalytic activity and high stability is obtained, and the requirements of the fields of electrocatalysis, energy storage and the like are met.

The invention discloses a Zr-doped nickel-based electrocatalyst based on a 4, 4 '-dipyridyl chelating ligand and a preparation method and application thereof.The Zr-doped nickel-based electrocatalyst is characterized in that Ni < 2 + > serves as a central metal ion, 4, 4'-dipyridyl serves as the chelating ligand, and a stable coordination structure is constructed; zr is introduced as a doping element, and the electron density and the coordination environment of the catalyst are regulated and controlled by adjusting the doping proportion of Zr; and carbon fiber paper is used as a load electrode. A supported catalyst is prepared by using a constant-current electrodeposition method under a three-electrode system, and the catalyst is directly deposited on the surface of carbon fiber paper to form a self-supporting structure. The preparation method is simple in process, can be amplified on a large scale, and does not need a high-temperature roasting or complex solvent heat treatment step. The obtained catalyst is used for preparing adipic acid by electrocatalytic oxidation of cyclohexanol under an alkaline condition, and shows excellent catalytic activity and selectivity. The invention provides a green, efficient and low-cost adipic acid electrocatalytic synthesized novel electrocatalytic material, and the novel electrocatalytic material has a good industrial application prospect.

A method for producing a stator includes: a coil preparation step of preparing a coil in which an insulating coating is formed on a conductor; a stator core preparation step of preparing a stator core around which the coil is wound; an insulating coating peeling step of peeling off the insulating coating at a portion of the coil to be welded; a carbonization step of carbonizing a surface of an end portion of the insulating coating on a side facing conductor exposed by the peeling; a coil arrangement step of arranging the coil on the stator core; a welding step of welding the conductors exposed by the peeling in a plurality of the coils; and an electrodeposition coating step of performing electrodeposition coating on the exposed conductor and the carbonized surface of the insulating coating in each of the plurality of coils using a resin material.

Briefly, a sensor for a continuous biological monitor is provided for measuring the level of a target analyte for a patient. The sensor has a working wire and a reference wire, where the working wire has an analyte limiting layer that passes more than 1 in 1000 analyte molecules from the patient to an enzyme layer. The enzyme layer has an enzyme entrapped in a polyurethane cross-linked with acrylic polyol. As free electrons are generated, a conductor transfers the electrons to the biological monitor. In some cases, the sensor may be constructed without the use of any expensive platinum.

The invention relates to a high-thermal-conductivity nitride whisker reinforced nitride ceramic-based composite material and a preparation method thereof, and the preparation method comprises the following steps: dissolving a carbon precursor and an aluminum salt in a solvent containing a supporting electrolyte to obtain a carbon precursor / aluminum salt electrolyte; placing a conductive substrate in a carbon precursor / aluminum salt electrolyte, performing electrochemical deposition to obtain an aluminum / carbon precursor substrate, cutting the aluminum / carbon precursor substrate into a frame-type aluminum / carbon precursor growth substrate, transferring the frame-type aluminum / carbon precursor growth substrate into a graphitization furnace, and performing gradient heating carbon thermal reduction nitridation reaction to obtain an aluminum nitride whisker / porous carbon composite frame after the reaction; mixing the nitride particle powder, a sintering aid and a dispersing agent to obtain mixed slurry; and filling the aluminum nitride whisker / porous carbon composite frame with the mixed slurry, carrying out dry-pressing molding to obtain a composite board, and carrying out hot-pressing calcination to obtain the nitride nanofiber toughened nitride ceramic substrate. Accurate regulation and control of the growth process of the aluminum nitride whiskers are achieved, and the problems that the length-diameter ratio of aluminum nitride nanofibers is low, and distribution is uneven are effectively solved.

The invention provides a covalent organic framework / conducting film composite material as well as a preparation method and application thereof, and belongs to the technical field of covalent organic framework materials. The conductive film is used as the substrate of the diaphragm, and the conductivity of the diaphragm is improved by utilizing the high conductivity of the conductive film, so that the electrochemical performance of the lithium-sulfur battery is improved; in addition, the conductive film has adsorption and catalysis effects on polysulfide, and shuttling of the polysulfide can be inhibited; cOFs are subjected to in-situ growth on the surface of the conductive film through two times of electrochemical deposition, polysulfide is limited in a pore channel by using a pore channel structure of the COFs, and shuttling of the polysulfide is inhibited; by adjusting the monomer concentration of two times of electrochemical deposition, the COFs structure is regular, and the electrochemical performance of the lithium-sulfur battery is further improved.

The application discloses a flexible transparent aqueous zinc ion battery polyaniline / vanadium oxide composite positive electrode sheet and a preparation method thereof, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: using vanadyl sulfate aqueous solution as an electroplating solution, using a gold grid / PET as a working electrode, and using a platinum sheet as a counter electrode to construct a two-electrode structure; a vanadium oxide layer is deposited on the surface of the gold grid / PET by adopting a constant-voltage electrochemical deposition method, and a vanadium oxide / gold grid / PET is prepared; sulfuric acid and polyaniline are added into deionized water to prepare an electroplating solution, the vanadium oxide / gold grid / PET is used as the working electrode, the platinum electrode is used as the counter electrode, and a saturated calomel electrode is used as a reference electrode to construct a three-electrode structure; a polyaniline layer is deposited on the surface of the vanadium oxide / gold grid / PET by adopting a constant-voltage electrochemical deposition method, and the composite positive electrode sheet is obtained.

A digital nail system includes a client device, a color programming device, and an artificial nail assembly. The client device may include a nail color app for providing color options for programming the artificial nail assembly, with each color option having at least one corresponding color file associated therewith that includes a voltage list. The color programming device is configured to communicate with the client device to receive at least one corresponding color file corresponding to at least one user-selected color option, and is configured to generate programming voltages in the voltage list for the at least one corresponding color file.

The application provides a copper electrode based on a UiO-66-NH2 metal organic framework film, and a preparation method and application thereof, and relates to the fields of electrocatalysis and new energy materials. The electrode is composed of a rough metal copper substrate (rCu) and a continuous and uniform dense film of UiO-66-NH2 on the surface, the rCu is prepared by chemical oxidation of a commercial copper foil to generate CuO nanosheets and then electrochemical reduction, and the film is grown by cathodic electrodeposition for 20 minutes. The electrode is applied to the electrocatalytic reduction of nitrate to synthesize ammonia in a neutral medium, the enrichment of hydrated potassium ions in the film, the reconstruction of the interface water to build a rich-proton limited microenvironment, and the reduction of the activation energy of the rate-determining step. In a continuous flow system, the electrode can be stably operated at a current density of 800 mA cm ‑2 for more than 40 hours, and high-purity ammonium chloride can be recovered, so that the problems of insufficient proton supply, low selectivity and low activity in the prior art are solved.

A system includes a wire-holding fixture configured to be received in an EP station. The wire-holding fixture comprises terminals, and each terminal is electrically coupled to a respective working wire of a plurality of working wires. The working wires extend away from the wire-holding fixture. A set of EP stations is included, and each EP station is configured to receive the wire-holding fixture. A container is configured to hold an electropolymerization solution and positioned beneath the EP station such that the working wires is immersible. A board comprising a plurality of electrical contacts is included, and each electrical contact is configured to electrically engage a corresponding terminal. A controller is configured to apply a voltage to the working wires through the respective terminals and electrical contacts to initiate electropolymerization of the material from the electropolymerization solution to form a polymer layer on each working wire.

This invention relates to the field of steel-magnesium composite workpiece technology, and discloses a nano-injection molded steel-magnesium composite workpiece and its preparation method; including the following operation steps: Step 1: Degrease and wash the steel-magnesium composite workpiece with water, immerse it in an alkaline solution, wash it with water, perform pH gradient washing, immerse it in an acidic solution, wash it with water, and sonicate it in a chromate-nitric acid solution for 10~20s to obtain steel-magnesium composite workpiece A; Step 2: (1) Electrolyze the steel-magnesium composite workpiece A in an electrolyte, take it out, wash it with water, and dry it to obtain steel-magnesium composite workpiece B; (2) Wash the steel-magnesium composite workpiece B in hot water, activate it in a silane coupling agent solution, and perform nano-injection molding to obtain a nano-injection molded steel-magnesium composite workpiece. In this scheme, the potential difference on the surface of the steel-magnesium composite workpiece is improved and the surface roughness difference is reduced by the electrolyte to improve the interfacial bonding stability.

The invention provides a molecular classifier for detecting gastric cancer miRNA. A preparation method of the molecular classifier comprises the following steps: depositing a PABA modification layer on the surface of a screen-printed electrode; activating carboxyl on the surface of the para aminobenzoic acid modification layer by adopting an EDC / NHS composite system; carrying out amination modification on an MXene material, and coating the surface of the activated para aminobenzoic acid modification layer with the modified MXene material to form an MXene functional layer; depositing gold nanoparticles on the surface of the MXene functional layer to obtain an electrochemical activity sensing interface; a signal reporter molecule is combined with an aptamer probe, the signal reporter molecule is a DNA tetrahedron-methylene blue complex, and the combined complex is dropwise added on the surface of an electrochemical activity sensing interface, so that the aptamer probe is combined on the surface of the electrochemical activity sensing interface. The molecular classifier can be used for preparing gastric cancer miRNA detection products, and the problems that in the prior art, a classifier is high in complexity and high in signal leakage risk are solved.

The application discloses a method for coating a PLA layer of Ag-DCPD film layer surface with doped Ca-Cur submicron modified material, and relates to the technical field of medical material surface biological coating. The method comprises the following steps: an LPBF-NiTi alloy base is manufactured by using a laser powder bed fusion additive manufacturing technology and is pretreated; the pretreated LPBF-NiTi alloy base is subjected to electrochemical deposition in an electrolyte solution to obtain an LPBF-NiTi alloy base with a deposited Ag-DCPD film layer; CaCl2 and curcumin are dissolved in anhydrous ethanol, and are placed in a sealed container containing (NH4)2CO3 for constant-temperature reaction to obtain Ca-Cur submicron modified material; polylactic acid is dissolved in dichloromethane, and then the Ca-Cur submicron modified material is dispersed in the polylactic acid to obtain a leaching solution; the LPBF-NiTi alloy base with the deposited Ag-DCPD film layer is repeatedly immersed and pulled in the leaching solution to obtain an LPBF-NiTi alloy base coated with an Ag-DCPD / PLA / Ca-Cur composite film layer. Through the method, the corrosion resistance, biocompatibility and antibacterial and anti-inflammatory performance of the Ag-DCPD film layer are successfully improved.

The application belongs to the technical field of electrolysis of water, and particularly relates to a NiFe bimetallic MOF self-supporting bifunctional electrode for electrolysis of water and a method for electrolysis of water. The electrode takes foamed nickel as a substrate, and the surface of the substrate is uniformly coated with NiFe bimetallic MOF. The coating method comprises the following steps: two pieces of foamed nickel after cleaning and pretreatment are taken as anodes, one piece of foamed nickel after cleaning and pretreatment is taken as a cathode, and the anodes and the cathode are immersed in an electrolyte; under the condition of a constant current of 14-16 mA of a direct current power supply, electrodeposition is performed for 15-55 min; the area of the anode foamed nickel is larger than that of the cathode; in the electrolyte, N,N-dimethylformamide is taken as a solvent, and nickel salt, iron salt, 1,3,5-benzene tricarboxylic acid and triethylamine hydrochloride are uniformly dissolved in the solvent; the molar ratio of Ni to Fe is 40-75:1; and the concentration of triethylamine hydrochloride is 0.01-0.1 mol L⁻¹. The application adopts a double-anode electrodeposition process to improve deposition uniformity, fully expose active sites and reduce electrodeposition energy consumption; and the synergistic effect of the Ni-Fe bimetallic MOF optimizes the HER and OER catalytic performance of the electrode.

A method for handling a dispersion for electrolytic deposition is used in the case where an electrolytic deposition film is formed on a support with conductive properties by anionic electrolytic deposition, and the method includes: adjusting the concentration of an organic acid contained in the dispersion for electrolytic deposition by subjecting the dispersion for electrolytic deposition to an anion exchange treatment.An electrolytic deposition device (10) is used in the case where an electrolytic deposition film is formed on a support with conductive properties by anionic electrolytic deposition, and the electrolytic deposition device includes: an electrolytic deposition container (20) in which an electrolytic deposition dispersion is stored and into which a support and a counter electrode are immersed; an anion exchange device (30) to subject the electrolytic deposition dispersion to an anion exchange treatment; and a circulation device for the electrolytic deposition dispersion (40) to circulate the electrolytic deposition dispersion between the electrolytic deposition container (20) and the anion exchange device (30).

Method of preparing polycyclic aromatic hydrocarbons in a molecular form and in the form of a coating, using aromatic precursors and the process of their oxidation, is characterised in that the electrochemical oxidation of naphthalene is carried out in a three-electrode system, where the working electrode is a platinum electrode with a surface of 0.5-5 cm2, preferably 2 cm2, the reference electrode is a silver electrode Ag|0.001M Ag+, (C4h9)4N+, PF6 II with a potential of 0.197 V against ferrocene, and the counter electrode is a platinum mesh located in a separate electrode space filled with a supporting electrolyte and closed with a porous PTFE electrolytic key, with a surface area corresponding to half the surface area of the working electrode, where the geometry of the system ensures parallelism of the working electrode and the PTFE membrane closing the space of the counter electrode and their positioning opposite each other, and the distance of the working electrode from the PTFE membrane is 0.2-2.0 cm, preferably 0.5 cm, and the distance between the working electrode and the counter electrode is 0.5-2.5 cm, preferably 1 cm, the solvent is dry acetonitrile with a water content below 10 ppm, stored in an inert, anhydrous and oxygen-free atmosphere, and a flow of dry protective gas is used, preferably argon with a purity higher than 5.0, passed through a scrubber filled with dry acetonitrile with a water content below 10 ppm, and the supporting electrolyte is tetrabutylammonium hexafluorophosphate at a concentration of 0.1 mol / l in dry acetonitrile, wherein the initial concentration of naphthalene in acetonitrile is 1-10 mmol / l, preferably 6 mmol / l, and a potential is imposed in the range of 1.3-2.0 V vs RE, preferably 1.6 V vs RE, and then the oxidation is carried out under potentiostatic conditions by passing a charge Q = 1-20 C / cm2 of the working electrode surface, preferably 5 C / cm2, at room temperature under normal pressure for 20-400 minutes, preferably for 100 minutes, as a result of which a smooth and tight coating containing polycyclic aromatic hydrocarbons is obtained on the surface of the working electrode, which coating adheres tightly to the electrode surface and has a thickness in the range of about 10-100 nm, preferably about 30 nm, conducts electric current and has an energy gap in the range of 2.0-2.5 eV, and in the solution polycyclic aromatic hydrocarbons are obtained in a molecular form with masses reaching about 2400 Da, composed of phenyl fragments with a mass of 74 Da, which are obtained in a powder form by evaporating the solvent, and exhibit an energy gap in the range of 2.0-2.5 eV. Coating containing polycyclic aromatic hydrocarbons is characterised in that it is deposited on a platinum surface, it is smooth and continuous, has a thickness in the range of 10-100 nm, preferably about 30 nm, conducts electric current and has an energy gap in the range of 2.0- 2.5 eV. Polycyclic aromatic hydrocarbons in a molecular form are characterised that they have a mass reaching about 2400 Da and are composed of phenyl fragments with a mass of 74 Da, exhibit solubility in dry acetonitrile, and have an energy gap in the range of 2.0-2.5 eV. Polycyclic aromatic hydrocarbons in the form of smooth conducting coatings, either solution or powder, are prepared under normal conditions, without the need to use high temperatures, reduced pressure or strong oxidants, which significantly reduces production costs and is environmentally friendly.

A redox-active, conductive, polycationic, and coordinating polymer with a coordinative redox deposition for oxygen evolution reaction (OER) electrodes. The electrodes can contain low loadings of earth-abundant catalysts and are highly active and stable under harsh conditions. The preparatory methods described herein are straightforward and can be utilized to prepare electrodes with different supports and metal ion precursors. Polycarbazole (PCz) provides a highly conductive, stable support for the OER catalysts. XPS and UV-vis studies indicate that the deposition proceeds by coordination to the nitrogen sites in PCz. PCz is believed to provide a local high [OH-] for the turnover limiting step in the OER.

The invention discloses an MOF oxygen evolution catalyst, a preparation method, an application and an electro-catalysis water decomposition method, the catalyst comprises a porous conductive carrier and an active component, the active component is loaded on the porous conductive carrier, the active component comprises an organic ligand compound containing a plurality of carboxylate radical groups and metal ions, and the metal ions are loaded on the porous conductive carrier. The carboxylate radical groups are connected with metal ions through coordination bonds; the metal ions comprise at least one of cobalt and titanium. In the embodiment of the invention, the prepared MOF oxygen evolution catalyst with high catalytic activity is an MOF catalyst material directly generated in situ on a porous conductive carrier through an electrochemical method, MOF grown in situ on a cathode is tightly combined with the carrier, the conductivity and the catalytic activity are good, metal ions are introduced into a metal-organic framework to serve as dissimilar metal nodes, and the performance of the catalyst is improved. The metal-oxygen bond is enhanced, the MOF is endowed with excellent stability, and the OER catalytic activity is improved.

A test piece 14 and a counter electrode 13 having a shape conforming to the shape of a film formation surface 14A of the test piece 14 are arranged close to each other, and a film of a conductive polymer is formed on the test piece 14 by electrolytic polymerization. The method involves preliminarily obtaining conditions of the voltage and integrated current value under which a desired film thickness is obtained by electrolytic polymerization, and conducting electrolytic polymerization until the integrated value of current flowing between the counter electrode 13 and the test piece 14 reaches the integrated current value, while keeping a constant voltage between the counter electrode 13 and the test piece 14.

The invention relates to the technical field of stainless steel elbows, in particular to a plastic-coated stainless steel reducing elbow for pipe fitting connection and a preparation method of the plastic-coated stainless steel reducing elbow. A reinforcing piece is arranged at the turning position of the inner wall of the reducing elbow body, one end of the reinforcing piece is rotationally connected with the reducing elbow body, a sliding rod is arranged on the side wall of the reducing elbow body in a sliding and sealing mode, one end of the sliding rod makes contact with the reinforcing piece, the other end of the sliding rod is sleeved with a limiting cylinder, and the side wall of the limiting cylinder is in threaded connection with a threaded column. The reducing elbow main body is prepared from the following raw materials: 17.0 to 18.5 percent of chromium, 9.2 to 12.4 percent of nickel, 0.2 to 1.0 percent of manganese, 0.1 to 0.5 percent of silicon, 0.2 to 0.5 percent of titanium and the balance of iron. According to the reinforcing piece of the stainless steel reducing elbow, the flow speed of fluid can be reduced, abrasion of the fluid to the turning position of the reducing elbow is reduced, corrosion resistance is excellent, corrosion of acid, alkali, salt and other corrosive media can be effectively resisted, the mechanical strength is excellent, maintenance is not needed, meanwhile, the service life is long, and the replacement cost can be effectively reduced.

The application discloses a method for electroplating a Ni-P-Fe2O3-PTFE composite lubricating layer on the surface of an aluminum nitride base material, which comprises the following steps: performing composite acid liquid micro-etching and roughening treatment on the base material; preparing a gradient transition layer with gradually changed phosphorus content; performing electroplating in a plating solution containing modified Fe2O3 particles and PTFE by adopting a periodic reverse current and intermittent ultrasonic coupling process; and finally performing two-stage heat treatment. By constructing a unique structure of a PTFE lubricating network and Fe2O3 interface pinning, the application synchronously realizes strong combination (Lc2> 50 N) of the plating layer and the base material, high hardness (HV> 400), low friction (μ< 0.12) and excellent wear resistance, effectively solves the problem of the contradiction between poor combination of the metal lubricating layer on the surface of the aluminum nitride and performance, and the process is stable and controllable and suitable for complex-shaped parts.