36results about How to "Improve electrocatalytic activity" patented technology

The application discloses an electrolytic synthesis method of 3,6-dichloropicolinic acid, which comprises the following steps: S1, adopting a diaphragm electrolytic cell, taking an aqueous solution containing 3,4,5,6-tetrachloropicolinic acid and CO2 gas as the cathode liquid, taking an aqueous solution of alkali metal hydroxide as the anode liquid, taking a rhodium modified foam nickel electrode as the cathode, and taking a nickel-based material as the anode to perform an electrolytic reaction; and S2, after the reaction is completed, performing acid precipitation and filtration to obtain 3,6-dichloropicolinic acid. The cathode material is improved, the rhodium modified foam nickel electrode is used to replace the traditional silver mesh electrode, the three-dimensional porous structure of the foam nickel and the high catalytic activity of rhodium are utilized, the electrolytic efficiency is improved, the energy consumption is reduced, and meanwhile, the high product yield is maintained.

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The invention relates to the technical field of electrocatalysis, in particular to an oxygen / sulfur heterostructure oxygen evolution electrocatalyst and a preparation method and application thereof. Based on an in-situ oxidation strategy, a CuFeO layer is generated on the surface of CuFeS, and the CuFeS-coated CuFeO high-performance oxygen evolution electrocatalyst with a heterostructure is obtained. By constructing a sulfide-oxide heterojunction, a built-in electric field can be formed at an interface to promote charge separation and transfer, so that the electrocatalytic activity is remarkably improved. And on the other hand, the CuFeO layer on the outer layer serves as an armor, and the problem of oxidation of the surface of CuFeS is solved. The electro-catalytic performance and the long-term stability are obviously improved.

The application discloses a sludge resource utilization method and application thereof. The sludge resource utilization method comprises the following steps: performing electro-fermentation treatment on sludge to be fermented in an anode chamber of an electrolytic cell; and the anode electrode in the anode chamber comprises a carbon-based material modified by titanium oxide. The anode electrode of the electrolytic cell comprises the carbon-based material modified by titanium oxide, the hydrophilicity of the surface of activated carbon particles can be significantly improved by modifying the carbon material by titanium oxide, the biocompatibility and electrocatalytic activity of the material are improved, the growth of microorganisms is facilitated, the anaerobic fermentation speed of bacteria can be improved, the electro-fermentation process speed and treatment effect are optimized and improved, and the effective recovery of elements such as nitrogen, iron and phosphorus contained in the sludge is realized, so that the application prospect is good.

The application relates to an ionic liquid modified Cu-based bimetal electrode material and a preparation method and application thereof, and belongs to the technical field of material preparation. The method uses an in-situ reduction method to prepare the ionic liquid modified Cu-based bimetal electrode material, and the specific steps are as follows: copper salt and lanthanide chloride are dissolved in deionized water, and then ionic liquid is added after mixing; the mixture is stirred for 30 minutes under ice bath conditions. The above solution is slowly dropped into a sodium borohydride aqueous solution, the precipitate is extracted and filtered after the reaction is completed, the precipitate is washed with ethanol and water alternately for several times, and then the black solid is obtained after drying. The black solid is ultrasonically dispersed in a mixed solution of Nafion and isopropanol, then the dispersion liquid is uniformly coated on a gas diffusion electrode, and the electrode is pre-activated by a cyclic voltammetry method in a carbon dioxide-saturated electrolyte, so that the ionic liquid modified Cu-based bimetal electrode material is obtained. The electrode can be used as a high-efficiency electrode material to realize the conversion of carbon dioxide into ethylene under mild conditions. The Cu-based electrode material synthesis method has the characteristics of simple process and low cost, and is suitable for large-scale production and application.

This invention discloses the application of an electrode material for reducing intracellular resistance genes in drug-resistant bacteria. A platinum-doped dendritic TiO2 nanowire structure based on a three-dimensional material is formed by growing a micron-sized TiO2 backbone array and platinum-doped nano-sized TiO2 branches on the surface of a porous electrode. The prepared dendritic nanowire three-dimensional electrode material has a larger specific surface area, providing more reactive sites and strong electric field sites. Platinum doping enhances the conductivity and electrocatalytic performance of the nanowires. Furthermore, by combining it with chloride salts / oxidants, the electroporation and electrocatalysis of the nanowire electrode surface are coupled. The strong electric field confined at the nanowire tip induces perforation of the drug-resistant bacterial cell structure, strengthening the contact and reaction between the oxidant and the resistance gene. The high electrocatalytic activity confined at the nanowire tip induces the generation of strong oxidizing free radicals, achieving the goal of destroying the drug-resistant bacterial cell structure and efficiently reducing intracellular resistance genes.

The application relates to a preparation method of an entropy-based oxide catalyst with high metallic property and application of the entropy-based oxide catalyst in hydrogen production by acidic electrolytic water, and belongs to the field of catalysis. A water-soluble salt containing at least Ru, Ir and A is uniformly mixed, hydrolyzed and reduced under water bath stirring condition by taking zinc oxide as a carrier and a sodium borohydride solution as a reducing agent, then the black powder of the medium-entropy alloy is formed through filtration, washing and drying, and finally the black powder is subjected to rapid incomplete oxidation under the condition of 300-500 DEG C and air atmosphere, and then is subjected to acid pickling, filtration, washing and drying to prepare the entropy-based oxide catalyst with high metallic property. The catalyst contains a large amount of Ir-Ir metal bonds and / or Ir-Ru metal bonds, and the proportion can reach 30%-40%. The mismatch between the metal atom fingerprint structure and the metal-oxygen atom coordination structure causes serious lattice distortion, induces unbalanced distribution of stress and strain, and promotes the kinetics of the acidic oxygen evolution reaction.

The application discloses a graphene composite high-entropy metal oxide coating titanium-based electrode and a preparation method and application thereof, and relates to the technical field of electrode materials, in particular to a graphene composite high-entropy metal oxide coating titanium-based electrode and a preparation method thereof.The preparation method of the graphene composite high-entropy metal oxide coating titanium-based electrode comprises the following steps: S1, pretreating a titanium base; S2, placing the pretreated titanium base in an electrodeposition liquid, wherein the electrodeposition liquid is a mixed liquid of an oxidized graphene solution and a high-entropy metal salt solution; S3, performing electrodeposition on the titanium base by taking the titanium base as an anode and a graphite electrode as a cathode; and S4, performing heat treatment on the titanium base with the coating deposited thereon in an inert gas atmosphere.The graphene composite high-entropy oxide is prepared by electrodeposition, and the process is simple and the preparation cost is low.The graphene composite high-entropy oxide coating titanium electrode prepared by the application can realize the removal of more than 85% of COD within 120 min when used for treating high-concentration wastewater with COD of 500-20000 mg / L, has excellent stability, and has a wide application prospect.

This invention relates to the field of electrode technology, and more particularly to symmetrical composite electrodes, their preparation methods, and applications. This invention utilizes a one-pot method for self-assembly of doped cubic lanthanum ferrite-based perovskite oxide and doped cubic fluorite-type cerium oxide, followed by in-situ precipitation of doped metal nanoparticles. The chemical formula of the doped cubic lanthanum ferrite-based perovskite is (La... 0.5 Sr 0.5 )[(Fe 0.9 Nb 0.1 ) 1.0‑x M x ]O 3‑δ The chemical formula of doped fluorite-type cerium oxide is Gd. 0.075 Ce 0.925‑y M y O 2‑δ The doped metal nanoparticles are elemental M. When a reducing gas is introduced, the metal nanoparticles M precipitate in situ. This heterogeneous structure of the metal particles is tightly bonded to the composite electrode material, exhibiting good dispersion, and the embedded structure ensures excellent electrode stability. As a symmetrical electrode for SOEC, this invention achieves superior catalytic activity for carbon dioxide reduction and methanol oxidation.

The invention relates to the technical field of electrocatalysts, in particular to a preparation method and application of a high-activity self-supporting ferro-nickel hydroxide (Fe-NiOOH) oxygen evolution reaction (OER) electrocatalyst, and the high-activity self-supporting Fe-NiOOH OER electrocatalyst is prepared through substrate pretreatment, metal salt ion exchange and vacuum drying. The electrocatalyst is prepared through an ion exchange method, the obtained target product Fe-NiOOH is of an amorphous amorphous structure, has good electrocatalytic activity and stability, especially has excellent OER catalytic performance under the alkaline condition, the preparation process is simple, the reaction condition is mild, the production cost is low, and large-scale industrial application can be achieved easily.

The application provides a method for detecting the redox capacity of a non-homogeneous aqueous medium under different potential conditions, and belongs to the technical field of electrochemical analysis. The method system uses a reticular titanium-based ruthenium iridium oxide coating electrode as a working electrode, improves the upper limit of the sample addition amount of the existing mediated electrochemical analysis system from the mg level to the g level, solves the representativeness problem of the sample in the test of the non-homogeneous aqueous medium, and improves the precision of the redox capacity analysis from mmol e ‑ / kg to μmol e ‑ / kg. By regulating the applied voltage of the working electrode and adding different electronic mediator substances, the test of the redox capacity of the non-homogeneous aqueous medium under different potential conditions can be realized. The method has high sensitivity and good accuracy, in addition, the titanium-based ruthenium iridium oxide coating electrode has strong corrosion resistance, low cost, is convenient to process, and is simple to maintain, and has a good practical application prospect.

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

The invention relates to a bismuth oxide core-shell nanoparticle modified porous defect-rich carbon nitride material as well as a preparation method and application thereof. The method comprises the following steps: calcining urea in an air atmosphere to obtain the bismuth oxide core-shell nanoparticle modified porous defect-rich carbon nitride material; calcining in an atmosphere to obtain porous defect-rich carbon nitride; mixing an ethylene glycol liquid, a nitric acid solution, polyvinylpyrrolidone and the solid at room temperature to obtain a mixed solution, placing the mixed solution in a reaction kettle, carrying out water bath heating to generate a precipitate, filtering out the precipitate, and cleaning, drying and grinding the precipitate to obtain a powdery solid, the bismuth oxide core-shell nanoparticle modified porous defect-rich carbon nitride material is obtained. The material prepared by the invention is high in response capability to the sum.

The invention provides an electrochemical sensor constructed based on an NP-G-AuPd NFs composite material. The electrochemical sensor comprises a working electrode and a sensing material modified on the working electrode, the sensing material is a nitrogen and phosphorus co-doped graphene-AuPd nanoflower composite material. Therefore, when the AuPd NFs and the NP-G are mixed, the AuPd NFs and the NP-G can be embedded in the middle of the graphene, the graphene is stripped to present a single-layer yarn-shaped structure, the conductivity of the graphene can be enhanced, the larger specific surface area of the graphene is a good interface for loading the AuPd NFs, and the NP-G and the nano material are mixed to finally prepare the NP-G-AuPd NFs composite material with better conductivity. An electrochemical sensor based on the NP-G-AuPd NFs composite material is constructed to detect diclofenac sodium, and a DPV test result shows that the composite material has good electro-catalytic performance and can be used for determining an actual sample.

The invention belongs to the technical field of glycerol detection devices in fermentation, food analysis, clinical medicine and bioengineering, and relates to a preparation method of a glycerol biosensor. Cuprous oxide is etched through sodium sulfide, a hollow cuprous sulfide nanocube with nanosheets stacked layer by layer on the surface is synthesized, the conductivity and active sites of the material are increased, and rich binding sites are provided for loading glycerol-3-phosphate oxidase and glycerol kinase. The nano material is fixed on a glassy carbon electrode, and glycerol-3-phosphate oxidase and glycerol kinase are dropwise added on the electrode, so that the glycerol biosensor with high performance is obtained. The method has the advantages of simple preparation process and low cost, has higher performance in real sample detection, can be used for large-scale production, and can realize real-time monitoring of glycerol in fermentation liquor.

This invention relates to a method for preparing a composite PbO / ZnO three-dimensional porous lead-carbon battery additive, belonging to the field of lead-carbon battery technology. The invention involves pre-treating a titanium substrate by degreasing, followed by etching and activation in a nitric acid-hydrochloric acid mixture to obtain an activated titanium substrate. A three-dimensional hierarchical porous carbon, carbon black, and PVDF binder are mixed uniformly to obtain a mixture. N-pyrrolidone is added to the mixture, and the mixture is further mixed uniformly to obtain a three-dimensional hierarchical porous carbon slurry. The three-dimensional hierarchical porous carbon slurry is uniformly coated onto the surface of the activated titanium substrate and dried to obtain a carbon-based anode. Using a lead nitrate-zinc oxide mixed solution as the electroplating solution, the carbon-based anode is used as the anode, and a copper plate as the cathode. Electroplating is performed at 40–50°C with stirring for 1–2 hours. After electroplating, the anode is removed, washed with deionized water, and the electroplated layer is scraped off the titanium substrate surface and vacuum dried to obtain the composite PbO / ZnO three-dimensional porous lead-carbon battery additive. In this invention, PbO / ZnO is uniformly modified on the three-dimensional hierarchical porous carbon material, which, as a lead-carbon battery additive, can effectively inhibit the hydrogen evolution reaction.

The application discloses a preparation method of a copper-cobalt-doped carbon nitride electrocatalyst, and a product and application thereof. The copper-cobalt-doped carbon nitride electrocatalyst is prepared by taking 3-amino-1,2,4-triazole as a precursor, 1,10-phenanthroline as a ligand, and a copper source and a cobalt source as metal sources, and has a C3N5 carrier and Cu / Co dispersed in the carrier. The catalyst has rich active sites and excellent conductivity, and through the synergistic effect of copper and cobalt, the hydrogen evolution side reaction is inhibited, and the activity, selectivity and stability of the electrocatalytic reduction of nitrate to produce ammonia are improved. The problems of low activity, low faradic efficiency, poor stability and high cost of the existing electrocatalytic nitrate reduction ammonia catalyst are effectively solved. The preparation method adopts a non-noble metal + non-metal substrate, raw materials are easy to obtain, the preparation process is simple, and the cost is low, and thus the method can realize large-scale production. The obtained catalyst is suitable for the field of electrocatalytic reduction of nitrate to produce ammonia, can realize water nitrate pollutant treatment and high-value ammonia resource recycling, and has dual benefits of environmental protection and economy.

The invention relates to the technical field of novel electro-catalysis materials, and discloses a fullerene modified carbon loaded amorphous niobium oxide nano island confinement osmium-based ultra-small cluster electro-catalyst as well as a preparation method and application of the fullerene modified carbon loaded amorphous niobium oxide nano island confinement osmium-based ultra-small cluster electro-catalyst. Amorphous niobium oxide (NbOx) and osmium (Os) clusters are uniformly loaded on the carbon substrate material, the amorphous niobium oxide is in a nano island form, and the average particle size of the osmium (Os) clusters is 0.8-1.2 nm. The ultrathin nano carbon sheet FDC prepared by modification of fullerene has the characteristics of excellent conductivity and high specific surface area, so that active components are fully exposed, the phase interface contact area is increased, and the heterogeneous catalysis behavior is greatly promoted. The electrocatalyst has excellent electrocatalytic activity and stability, the active components of the electrocatalyst have the characteristics of small particle size, uniform particle distribution and the like, and the problems of reduction of catalytic performance and the like caused by reduction of active sites due to overlarge particles of the active components in the electrocatalyst with a composite structure are solved.

The application discloses a nickel alloy nano electrode and a preparation method and application thereof, and relates to the technical field of battery technology, and specifically discloses a nickel alloy nano electrode and a preparation method and application thereof.

The application relates to a preparation method of an ultrasonic-assisted carbon quantum dot modified graphite carbon nitride material and application thereof, and belongs to the technical field of hydrogen peroxide electrocatalyst synthesis. The preparation method of the ultrasonic-assisted carbon quantum dot modified graphite carbon nitride material comprises the following steps: placing urea in an aluminum crucible with a cover, heating to 500-600 DEG C at a heating rate of 5-10 DEG C / min, calcining for 2-3 h, grinding and collecting a yellow product, marking the product as g-C3N4; dispersing the obtained g-C3N4 in a KOH solution, performing ultrasonic peeling for 8-16 h to obtain supernatant, centrifuging and collecting the supernatant to obtain a sample, and washing and drying the sample with deionized water for multiple times to obtain a carbon quantum dot (CQDs) modified graphite carbon nitride material. The carbon quantum dot modified graphite carbon nitride catalyst is obtained by introducing the carbon quantum dots, and can be applied to a hydrogen peroxide electrocatalytic reaction as a catalyst.

The application discloses a preparation method of a dual-mode CD122 gene thalassemia detection self-powered biosensor, successfully applies an enzyme biological fuel cell (EBFC) to dual-mode detection of CD122 gene thalassemia, realizes quantitative analysis through changes of EBFC output voltage and changes of electrolyte color (RGB Blue value), and mainly concentrates on a cathode of the EBFC in the self-powered design. When CD122 exists, an electrode starts catalytic hairpin self-assembly (CHA) amplification, realizes recycling of CD122, and provides a binding site for subsequent hybridization chain reaction (HCR) amplification, at this time, methylene blue (MB) adsorbed by a biological cathode increases, and an electric signal is enhanced, and meanwhile, electrolyte color becomes lighter (RGB Blue value becomes larger). The self-powered CD122 dual-mode biosensor based on the EBFC disclosed by the application can realize simple, rapid, sensitive and efficient detection of a target.

The invention belongs to the technical field of nano material preparation, and provides a preparation method of a biomass-derived molybdenum carbide-based electrochemical hydrogen evolution catalyst. Specifically, biomass Chinese yam with a wide source is used as a carbon and nitrogen source, a molybdenum-based precursor is obtained through simple impurity removal, airing, grinding and hydrothermal reaction with ammonium molybdate, then the precursor is roasted in an inert atmosphere, and the biomass nitrogen-doped carbon-molybdenum carbide nano composite catalyst is prepared by adjusting the carbonization temperature and the carbon-molybdenum ratio of reaction raw materials. The molybdate and the common biomass Chinese yam are adopted as raw materials, the source is wide, the price is low, the preparation method is simple and safe, and the controllability of the preparation process is high. In the prepared composite material, molybdenum carbide particles are good in dispersity on biomass carbon, and the composite material has good electrochemical activity and stability when being applied to an electro-catalysis water desorption hydrogen desorption reaction.

This invention discloses a Ru / VN-C / C self-supporting electrocatalytic material for hydrogen evolution, its preparation method, and its application. The preparation method includes: using an integrated process of precursor impregnation and high-temperature nitridation conversion to construct a vanadium nitride (VN) active layer in situ on the surface of a C / C three-dimensional conductive framework, obtaining a VN-C / C self-supporting electrode; preparing a ruthenium-containing precursor solution; immersing the obtained VN-C / C self-supporting electrode in the ruthenium-containing precursor solution obtained in step five, and performing reduction treatment under xenon lamp irradiation to reduce and load Ru in situ on the VN surface; after treatment, removing the sample, washing, and drying to obtain the Ru / VN-C / C self-supporting electrocatalytic material for hydrogen evolution; exhibiting strong interfacial bonding and excellent conductivity; using photoreduction to load highly dispersed Ru to regulate the electronic structure and improve hydrogen evolution kinetics; having no binder on the electrode, high utilization of active sites, and good stability under high current density; and possessing a simple process and controllable conditions, suitable for large-scale preparation, with broad prospects for industrial application.

This invention discloses a method for preparing a cobalt tetroxide / copper oxide-cuprous oxide composite catalyst for electro-reduction of nitrate to ammonia, comprising the following steps: (1) adding sodium hydroxide and ammonium persulfate to water to obtain solution A; (2) immersing pretreated copper foam in solution A to obtain copper foam with copper hydroxide on its surface; removing the copper foam from solution A, washing and drying it; (3) adding cobalt salt and urea to water to obtain solution B; (4) placing the copper foam with copper hydroxide on its surface from step (2) into solution B and performing a hydrothermal reaction at high temperature; washing and drying the solid after the reaction; (5) calcining the dried product at 320~360℃ for 1.5~2h to obtain the cobalt tetroxide / copper oxide-cuprous oxide composite catalyst. The composite catalyst prepared by the method of this invention has good catalytic activity and can achieve excellent ammonia Faradaic efficiency and high ammonia yield when electrocatalyzing nitrate reduction reaction under a specific window voltage.

This application provides an electrochemical sensor for detecting luteolin, comprising a working electrode and a sensing material modified on the working electrode; the sensing material is a Co-N / C nanomaterial. The Co-N / C nanomaterial prepared in this application possesses a unique structure and excellent electrocatalytic activity, which can significantly enhance the electrochemical response signal to luteolin, thereby achieving highly sensitive detection of luteolin. Simultaneously, this sensor exhibits good selectivity, effectively avoiding interference from other coexisting substances in the sample.

This invention discloses an electrochemical immunosensor based on a MoS2 / Ti3C2@NiCo2O4 composite material and its preparation method. The sensor uses a glassy carbon electrode as a substrate, sequentially modified with MoS2 / Ti3C2 nanohybrid material and nanoflower-like NiCo2O4, and then cross-linked and immobilized with NSE antibodies using a cross-linking agent. The highly conductive Ti3C2 and MoS2 composite form a hierarchical porous structure, increasing the specific surface area and electrocatalytic activity; the introduction of NiCo2O4 further synergistically enhances the material's catalytic performance, stability, and targeted recognition ability. This sensor utilizes the principle of antigen-antibody specific binding leading to changes in interfacial electron transfer impedance for detection. Experiments show that its detection linearity for NSE ranges from 1 pg / mL to 400 ng / mL, with a detection limit as low as 0.12 pg / mL, and it exhibits good selectivity, stability, repeatability, and clinical sample detection capability. This invention provides a highly efficient and accurate potential detection tool for the early screening of small cell lung cancer.

The invention provides a flexible magnetic response iron-based bimetallic carbon nanofiber membrane as well as a preparation method and application thereof. The flexible magnetic response iron-based bimetallic carbon nanofiber membrane comprises a porous carbon-based membrane formed by interweaving carbon fibers and an iron-based bimetallic compound loaded on the carbon fibers, wherein the composition of the carbon fiber comprises a carbon nano tube, and the iron-based bimetallic compound is selected from FeCo, FeNi, FeMn, FeSm, FeY or FeNd; the membrane has excellent conductivity, magnetic responsiveness and electrocatalytic activity. Under the action of an external magnetic field, reversible conversion and lithium ion diffusion of polysulfide are cooperatively regulated and controlled by a magnetic catalytic effect (MCE) induced by a magnetic phase of the iron-based bimetal and a magnetohydrodynamic effect (MHD), and rapid electron transmission and interface stability improvement are realized. The membrane can be respectively used as a positive electrode membrane reactor and a lithium negative electrode interface protection layer of a lithium-sulfur battery, and dual enhancement of electrochemical reaction kinetics and pole piece structure stability is realized.

The application relates to a preparation method of an N, P co-doped Fe-based electrocatalyst and application thereof. The preparation method of the embodiment comprises the following steps: preparing a mixture of FeN2P1 metal organic complex, a carbon carrier and dicyanodiamine; and baking the mixture under an inert atmosphere, wherein the baking process comprises the following steps: firstly, heating to 500-550 DEG C and keeping for 1-3 hours, and then heating to 700-900 DEG C and keeping for 1-3 hours, so as to obtain the N, P co-doped Fe-based electrocatalyst. The Fe-based electrocatalyst prepared by the application has excellent catalytic activity and stability for ORR and OER reactions.

This invention belongs to the field of electrocatalytic materials technology, and discloses a PAN-modified NiCoP / NF catalyst for urea-assisted seawater electrolysis and its preparation method. The method uses nickel foam as a support, synthesizes a NiCo precursor via a melt method, and then obtains the catalyst through PAN solution impregnation and one-step phosphating. By controlling the PAN concentration, the morphology and structure of the catalyst can be optimized, achieving a concentration of 0.05 g / mL. 1 A preferred structure was obtained by combining fine nanorods (20-50 nm in diameter) with an appropriate amount of amorphous carbon layer. The material exhibited excellent hydrogen evolution activity in alkaline seawater electrolyte, at 10 mA cm⁻¹. 2 The overpotential at the specified current density is 44 mV. In an alkaline seawater-urea mixed electrolyte, the overpotential of the urea oxidation reaction at the same current density is 1.32 V, which is significantly lower than the overpotential of the oxygen evolution reaction by 180 mV, demonstrating the dual advantages of high efficiency, energy saving, and wastewater resource utilization. This invention features a simple process and controllable structure, showing promising application prospects in the fields of hydrogen production through water electrolysis and urea wastewater treatment.

The invention discloses an electrochemical sensor as well as a preparation method and application thereof, and relates to the technical field of sensors. The electrochemical sensor comprises a working electrode, a reference electrode and a counter electrode, wherein the surface of the working electrode of the electrochemical sensor contains a nano composite material; the nano composite material comprises a nitrogen-doped carbon-coated ferric oxide material and conductive nano particles. The electrochemical sensor disclosed by the invention has high sensitivity and high stability, has strong adsorption capacity on a target object when being applied to the field of detection, is small in relative standard deviation of test results obtained after being placed for different days, is particularly suitable for detection of 2, 4-dichlorophenol, and has the advantages of wide detection linear range, high sensitivity and the like.