101 results about "Iron doped" patented technology

The invention discloses an iron-doped manganous-manganic oxide material and a preparation method and application thereof.According to the iron-doped manganous-manganic oxide material and the preparation method and application thereof, manganese sulfate serves as a manganese source, DTPA ferric ammonium salt serves as a complexing agent and a doping agent, ammonia water serves as alkali liquor, ethyl alcohol serves as a dispersing agent, and the preparation process is optimized in a targeted mode; the iron-doped manganous-manganic oxide material with uniform particle size distribution is prepared, the doping uniformity of the iron element in large-size micron-sized manganous-manganic oxide particles is improved while the sulfur content in the material is reduced, and the product is good in particle size uniformity and high in tap density. In addition, the process provided by the invention also has the characteristics of simple flow, easiness in operation, low input cost, high economic benefit and large-scale popularization and application.

The invention relates to the technical field of electro-catalysis materials, and discloses an iron-doped copper oxide catalyst, a preparation method thereof and application of the iron-doped copper oxide catalyst in electro-catalysis of nitrate to synthesize ammonia. The method comprises the steps that CuCl2 serves as a metal precursor, ascorbic acid serves as a reducing agent, and Cu2O nanoparticles are obtained through a hydrothermal precipitation method; then, Cu2O is added into a solution containing FeSO4, sodium borohydride is added, centrifugal washing and drying are carried out, and the iron-doped copper oxide nitrate electroreduction catalyst which is rich in defects and uniform in metal dispersion is obtained through a programmed heating pyrolysis reduction method. The electro-catalytic material obtained by adopting the method disclosed by the invention has a relatively large catalytic active area and relatively abundant defect sites and oxygen vacancies, the nitrate adsorption and activation effects are improved, the supply of active hydrogen is promoted by constructing stable heterogeneous active sites, the product selectivity and Faraday efficiency in NO3RR are improved, and the electro-catalytic material has good durability.

The invention relates to the technical field of electrochemical wastewater treatment, and discloses a method for treating industrial wastewater through electrochemical enhanced hydrolytic acidification. Pollutant degradation is achieved by constructing a reaction system containing a heterojunction anode, a composite cathode and a charcoal particle electrode, the heterojunction anode forms a gradient conductive structure through a titanium matrix composite metal oxide and a conductive polymer, and the bioelectrochemical activity is enhanced by fixing a symbiotic flora of sulfur reducing bacteria and electroactive bacteria; modifying the composite cathode based on the activated carbon felt; the biochar particle electrode is subjected to iron doping modification to form a porous interface. The method utilizes electrochemical redox to destroy sulfur bonds and cyclic structures of biotin, couples microbial metabolism to realize deep mineralization, has efficient electron migration and biological membrane stability, significantly improves the conversion efficiency of organic matters, reduces sludge byproducts, and is suitable for efficient treatment of biotin-containing wastewater in the fields of medicine and chemical industry.

The invention provides an iron-doped copper nanocluster nano-enzyme, a preparation method thereof and application of the iron-doped copper nanocluster nano-enzyme to detection of penicillin sodium by a colorimetric method. According to the preparation method, PVP-K30 and metal chlorate are taken as initial raw materials, deionized water is taken as a solvent environment, and the iron-doped copper nanocluster nanoenzyme is prepared through oil bath heating synthesis and dialysis purification. When 3, 3 ', 5, 5'-tetramethyl benzidine-hydrogen peroxide reaction is catalyzed by the nano-enzyme, the nano-enzyme is found to have an excellent peroxidase simulation effect, and rapid colorimetric detection of penicillin sodium is realized. The nano-enzyme provides an important thought for the development of novel nano-enzymes, and has a potential application value for the detection of antibiotics in a complex matrix.

An iron-doped flexible supercapacitor electrode comprises a base body and electrode slurry, and the electrode slurry is bonded on the base body. The electrode slurry comprises 40-60 parts by weight of iron-doped graphite and 2-10 parts by weight of adhesive resin; the iron-doped graphite comprises ferric trichloride intercalated graphite with first-order intercalation and ferric trichloride intercalated graphite with second-order intercalation, and the particle size of the iron-doped graphite is 600-5000 meshes; and the electrode slurry forms a film on the substrate and then is treated by hydrogen peroxide. In the invention, ferric trichloride intercalated graphite is used as a main conductive filler, and eigenstate conductive macromolecules are used as a connecting agent; when hydrogen peroxide treatment is carried out, Fe < 3 + > on the graphite is used as a catalyst to catalyze decomposition of hydrogen peroxide, the decomposition of hydrogen peroxide generates water and O2, and the overflow of O2 enables the electrode slurry to form a porous structure; the graphite layer is stripped into wormlike graphite; therefore, the adsorption performance of the electrode slurry layer is improved.

The invention discloses a preparation method of an iron-doped cerium-based perovskite type high-selectivity Cu ion capture stabilizing agent and application of the stabilizing agent in heavy metal pollution remediation, and the stabilizing agent is prepared through a sol-gel method and comprises the steps that cerous nitrate and citric acid are dissolved in water, and the mixture is heated and stirred to be gel-shaped; standing the gel solution in a drying oven at a constant temperature to obtain a Fe-Ce-PVSK precursor; grinding the precursor into powder, putting the powder into a quartz boat, and calcining in an air atmosphere through a horizontal tube furnace to obtain a product; and finally, washing to be neutral to obtain the iron-doped cerium-based perovskite stabilizing agent. Due to the high oxygen vacancy concentration and rich active sites, the stabilizing agent has high selectivity and high adsorption capacity and has specific capturing capacity on Cu < 2 + >. The preparation method has mild reaction conditions. The stabilizing agent can effectively reduce the bio-availability of heavy metals in a polluted matrix, promote healthy growth of plants, and realize pollution restoration and ecological function recovery at the same time.

The invention discloses an iron-doped lithium niobate material as well as a preparation method and application thereof, and belongs to the technical field of photoelectric materials. The preparation method of the material comprises the following steps: (1) mixing and grinding 10-100 mg of an iron salt precursor, 200-300 mg of lithium niobate and 500 mg of molten salt to obtain mixture powder; (2) calcining the mixture powder for 0.5-5 hours at the temperature of 350-800 DEG C; and (3) cooling the calcined mixture powder in air, and washing to remove the molten salt to obtain the iron-doped lithium niobate material. The iron-doped lithium niobate material prepared by the preparation method has a relatively stable structure, the light absorption capability is remarkably enhanced, and the application of the iron-doped lithium niobate material in the optical field is facilitated.

The invention belongs to the technical field of hydrogen production by electrocatalytic decomposition of water, and provides an iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst and application thereof in electrolyzed water. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst comprises a nickel substrate, wherein a porous catalytic activity layer of three-dimensional flower-shaped spherical nanoparticles formed by stacking two-dimensional nanosheets is loaded on the surface of the nickel substrate. The catalytic active layer comprises an iron-doped hexagonal stacked nickel hydroxide structure, the catalytic active layer comprises an iron-doped cubic stacked cerium oxide structure, and no iron with a crystalline structure exists in the catalytic active layer. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst disclosed by the invention shows excellent oxygen evolution performance in an oxygen evolution reaction of electrocatalytic water decomposition.

The invention is suitable for the technical field of environmental governance, and particularly relates to a Fe / Nv-PCN piezoelectric material preparation method, which comprises: in-situ synthesis of a PCN material: roasting urea to obtain the PCN material; synthesis of an Nv-PCN material: in a nitrogen atmosphere, roasting the PCN material to obtain the Nv-PCN material; ferric chloride (FeCl3. 6H2O) and ferrous sulfate (Fe2SO4. 7H2O) are used as iron sources to prepare Fe3O4 nano particles; the preparation method comprises the following steps: loading Fe3O4 nanoparticles on an Nv-PCN material by an in-situ coprecipitation method, cooling to room temperature after the reaction is finished, taking out, washing with deionized water and absolute ethyl alcohol in sequence, and drying in a closed state to obtain the Fe / Nv-PCN composite material. Through the synergistic effect of iron doping and nitrogen vacancy, the piezoelectric property and the catalytic activity are remarkably improved, the electron transmission capacity and the redox activity of the material are enhanced through iron doping, the energy band structure of the material is optimized through nitrogen vacancy, and the piezoelectric effect and the free radical generation efficiency are improved; the material has dual functions of adsorption and catalytic oxidation, and can degrade pollution for a long time.

The invention relates to the technical field of nano material preparation and application, in particular to a transition metal selenide catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, metal nickel salt, ferric salt, urea and ammonium fluoride are dissolved in deionized water, and a nickel-iron layered hydroxide nanosheet precursor is synthesized through a hydrothermal method; secondly, preparing an iron-doped nickel selenide catalyst by adopting a selenylation reaction; the electronic structure of nickel selenide is regulated and controlled by utilizing an iron doping strategy, and the catalytic performance is improved. The prepared iron-doped nickel selenide catalyst has good catalytic activity when being used for hydrogen evolution reaction and sulfur ion oxidation reaction. In a two-electrode sulfur ion oxidation coupling hydrogen production electrolytic tank, the current density of 10mAcm <-2 > can be output only by the voltage of 0.439 V, and the targets of efficient and energy-saving hydrogen production and sulfur ion oxidation upgrading into a high-added-value elemental sulfur product are achieved. The method has the advantages of simple and controllable preparation process, low raw material price, easiness in batch production and the like, and can be used as a catalyst for efficient water electrolysis hydrogen production and sulfur ion oxidation reaction.

The invention relates to the technical field of preparation of environmental functional materials, and discloses a directional synthesis method of magnetic porous iron-doped graphitized biochar, which is realized by the following steps: cooperatively inducing low-temperature graphitization by utilizing a biomass endogenous S < 2 > self-template and nano-diamond; performing double-complexing ultrasonic impregnation on the iron precursor to realize nanoscale dispersion; performing staged pyrolysis, pre-carbonizing in an inert atmosphere to construct a carbon skeleton, and synchronously completing iron reduction and graphitization in a reducing atmosphere; performing mixed pickling to synchronously remove the template and construct a passivation layer; and finally, carrying out magnetic separation to obtain the high-porosity and uniformly iron-doped magnetic graphitized charcoal. A graphitized porous structure is realized through cooperation of a low-temperature self-template and nano-diamond, iron agglomeration is inhibited through a double-complexing ultrasonic technology, a protective layer and active sites are synchronously constructed through mixed pickling and passivation, and three technical barriers of high-temperature collapse, iron particle inactivation and short cycle life of a traditional process are broken through.

The invention provides a method for processing nickel-iron alloy powder, comprising the following steps: S1, providing nickel-iron alloy powder; the nickel-iron alloy powder contains nickel, iron and chromium elements; S2, performing acid leaching on the nickel-iron alloy powder to obtain leaching residue and leaching liquid; cooling and crystallizing the leaching liquid to obtain solid crystals and a post-crystallization liquid; S3, performing chromium precipitation treatment on the post-crystallization liquid to obtain chromium precipitation residue and a post-impurity removal liquid; S4, performing nickel-iron separation on the post-impurity removal liquid to obtain a nickel precipitate and an iron separation liquid. The invention obtains a nickel precipitate and an iron separation liquid by processing the nickel-iron alloy powder, thereby reducing the iron doping in the nickel precipitate; the invention also effectively removes chromium before performing nickel-iron separation, thereby ensuring the acquisition of high-quality nickel products.

The invention discloses an iron-doped nickel-cobalt metaphosphate electrode material based on an oxide intermediate and a preparation method and application thereof, and relates to the technical field of supercapacitors, the preparation method comprises the following steps: preparing an electrolyte containing a nickel salt, a cobalt salt and an iron salt, and carrying out electro-deposition on a conductive substrate to obtain the iron-doped nickel-cobalt metaphosphate electrode material. A nickel-cobalt-iron layered double hydroxide precursor is obtained; sintering the nickel-cobalt-iron layered double hydroxide precursor to prepare an intermediate; and phosphating the intermediate by taking sodium hypophosphite as a phosphorus source to finish the preparation. The invention also discloses the iron-doped nickel-cobalt metaphosphate electrode material based on the oxide intermediate prepared by the method and an application of the iron-doped nickel-cobalt metaphosphate electrode material in preparation of a supercapacitor. Through a unique pre-oxidation process and substrate optimization, the electrochemical performance of the electrode material is remarkably improved, and the problems that an existing metaphosphate material is poor in conductivity and insufficient in active site are solved.

The invention discloses a method, a system and equipment for detecting the iron doping concentration in an iron-doped gallium nitride crystal. The method comprises the following steps: acquiring an image of the iron-doped gallium nitride crystal, and carrying out correction preprocessing on the image; calculating a chromaticity-brightness coordinate of the image after correction preprocessing in a CIExyY color space; wherein the chromaticity-brightness coordinate represents chromaticity information and brightness information of the iron-doped gallium nitride crystal; calculating an iron doping concentration corresponding to the chromaticity-brightness coordinate according to a preset correlation model; wherein the correlation model is a mapping model which comprises a mapping relation between the characterization chromaticity information and the iron doping concentration and a mapping relation between the characterization brightness information and the iron doping concentration. According to the method, rapid nondestructive detection of the iron doping concentration in the iron-doped gallium nitride crystal can be realized, the operation is simple and convenient, and the cost is low.

The disclosure relates to iron-doped potassium titanate nanotube catalysts, and methods of making and using such catalysts. The catalysts can be used in the hydrogenation of carbon dioxide (CO2) for the production of light olefins.

This invention discloses iron-doped copper hierarchical nanosheets, their preparation, and their application in the electro-oxidation of formaldehyde for hydrogen evolution, relating to the field of hydrogen energy technology. The preparation method of the iron-doped copper hierarchical nanosheets includes the following steps: using a copper mesh as a substrate, in-situ growth of Cu(OH)₂ nanowire arrays is performed by chemical oxidation; the Cu(OH)₂ nanowires undergo ion exchange in an aqueous solution of ferric nitrate to form a hierarchical Fe-Cu(OH)₂ structure. x Nanosheets; Fe-Cu(OH)₂ calcined at high temperature in air atmosphere. x Nanosheets are transformed into Fe-CuO nanosheets; the Fe-CuO nanosheets are then electrochemically reduced to Fe-Cu nanosheets, resulting in an Fe-Cu nanosheet array grown on a copper mesh. The Fe-Cu nanosheet array electrode in this invention exhibits superior formaldehyde electro-oxidation hydrogen evolution performance and significantly broadens the potential window for the electro-oxidation of pure Cu metal formaldehyde, making it suitable for low-energy-consumption electrochemical hydrogen production from formaldehyde.

The invention provides a self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst, a preparation method thereof and a hydrogen production method, and relates to the field of catalysts. The self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst comprises a conductive nickel substrate and a core-shell electrocatalyst arranged on the surface of the conductive nickel substrate, a core in the core-shell electrocatalyst comprises iron-doped nickel sulfide nanosheets, and a shell comprises nickel-cobalt layered double hydroxides. The core and the shell are tightly connected through strong chemical bonding, so that the material keeps structural integrity under a harsh electro-catalysis working condition, and active components are effectively prevented from falling off; the iron-doped nickel sulfide nanosheet with excellent conductivity is used as a natural framework, an efficient electron transmission path is provided for an external nickel-cobalt layered double-metal hydroxide shell layer, the internal resistance of the electrode is remarkably reduced, and reaction kinetics is accelerated.

The present technology relates to electrochemically active materials comprising a lithium-substituted iron-doped tunnel-type oxide of sodium, manganese, and at least one metallic element of formula NaaLibFecMndMeO2, wherein a is a number such that 0<a<0.22; b is a number such that 0.18<b<0.40 and is such that a+b is 0.38<a+b<0.62; c is a number such that 0<c≤0.40; d is a number such that 0.44 s d<1; e is a number such that c+d+e=1; and M is selected from manganese (Mn), titanium (Ti), vanadium (V), nickel (Ni), cobalt (Co), chromium (Cr), molybdenum (Mo), zirconium (Zr), tin (Sn), ruthenium (Ru), other similar metals, and a combination of at least two thereof. Also described are electrode materials, electrodes, electrochemical cells, and batteries comprising said electrochemically active materials.

The invention discloses an iron-molybdenum double-site synergistically enhanced electro-Fenton system and a method for synchronously removing heavy metal and organic pollutants in water through the iron-molybdenum double-site synergistically enhanced electro-Fenton system. The electro-Fenton system comprises a metal anode and a cathode, and the cathode comprises a graphite oxide felt loaded with iron-doped molybdenum disulfide microspheres; the iron-doped molybdenum disulfide microspheres comprise a nanosheet structure formed by iron, molybdenum and sulfur, and the content of Fe in the iron-doped molybdenum disulfide microspheres is 0.5-4 wt%. According to the preparation method, an electro-catalysis system is constructed by three-dimensional iron-doped molybdenum disulfide graded microspheres (Fe-MoS2HS) and graphite oxide felt (GF), H2O2 is synergistically activated by utilizing Fe-Mo double sites, a composite oxide species of. OH and < 1 > O2 is formed, valence state circulation of Fe < 3 + > / Fe < 2 + > and Mo < 6 + > / Mo < 4 + > is combined, the bottlenecks of catalytic efficiency and stability in the prior art are broken through, and the preparation method has the advantages that the preparation method is simple and easy to implement, and the application prospect is wide. The efficient and synchronous removal of heavy metals and organic matters is realized (the removal rate is greater than or equal to 95%), the energy consumption is reduced by more than 40% compared with that of the traditional electro-Fenton, and the method has remarkable technical advancement and practicability.

The application discloses iron-doped biochar loaded CuS, a preparation method thereof and application of the iron-doped biochar loaded CuS in removal of orange G by activated peroxodisulfate. The iron-doped biochar loaded CuS comprises porous biochar, and Fe2O3 particles, CuS and FeS loaded on the surface and in the pores of the porous biochar. In the application, transition metals are used to improve the surface properties of BC, introduce new active sites, obtain modified biochar, and then load CuS on the surface of the modified biochar, so that the PS catalyst with multiple active sites can be obtained, and the problems of low catalytic performance of original BC and agglomeration and deactivation of CuS can be solved.

The application aims to provide an organic cation-mediated iron-doped molybdenum disulfide nanosheet self-assembly method and application thereof, and belongs to the technical field of analysis and detection. The method uses polydiallyldimethylammonium chloride as intercalation ions, polyvinylpyrrolidone as stabilizer, and both of them cooperatively control the self-assembly of iron-doped molybdenum disulfide nanosheet. First, the iron-doped molybdenum disulfide nanosheet is prepared by using a hydrothermal synthesis method; then, the PDDA is used as intercalation agent, the PVP is used as stabilizer, and the homogeneous dispersed Fe-MoS2 nanosheet is obtained. Finally, the three-phase liquid-liquid self-assembly method is combined to realize the large-area and single-layer self-assembly of the Fe-MoS2 nanosheet. The method provides a new way for the macroscopic controllable assembly of two-dimensional materials, and combined with the noble metal SERS substrate, the rapid identification and detection of drug molecules can be realized.

This invention discloses an iron-doped cerium-based thermally conductive and microwave-absorbing nanomaterial, its preparation method, and its application, belonging to the field of thermal conductivity-microwave absorption technology. This invention utilizes a one-step hydrothermal method to prepare, for the first time, polycrystalline iron-doped cerium-based composite nanorods / wires, which are Fe... 0 ,Fe 2+ ,Fe 3+ A novel co-doped Ce(OH)3 / CeO2 core-shell composite exhibits a novel structure and formation mechanism. The size and aspect ratio of iron-doped cerium-based composite polycrystalline nanorods / wires can be further controlled by altering the molar ratios of strong base to cerium salt, iron salt to cerium salt, reaction temperature, and reaction time. The resulting material possesses excellent thermal conductivity and microwave absorption properties. The preparation method disclosed in this invention is simple to operate and produces novel product morphologies, overcoming the limitations of previous preparation methods, such as harsh reaction conditions, difficulty in controlling product morphology, and poor experimental repeatability. It has good potential for industrial application.

A tantalum capacitor according to an embodiment of the present disclosure includes: a tantalum body; a tantalum wire connected to the tantalum body; a conductive polymer layer disposed on the tantalum body; and a first reinforcement layer disposed on the conductive polymer layer and including iron (Fe) doped carbon nanotubes.

The application discloses a preparation and application of an iron-doped titanium suboxide electrode. The iron-doped titanium suboxide electrode is prepared by mechanically treating an iron compound and titanium suboxide, is used as an anode, and is used for synthesizing a disinfectant with natural seawater as an electrolyte and being coupled with photovoltaic technology, so that a solar energy driven electrolysis device is successfully constructed, the disinfectant with active components of hypochlorous acid is synthesized, and pathogenic bacteria in ballast water are killed. The electrode is composed of non-noble metal elements, and the price is much lower than that of a commercial size stable anode composed of noble metals ruthenium and iridium, and the electrode shows a reaction activity which is significantly higher than that of the commercial size stable anode, and the problem that high-abundance chlorine ions in seawater are difficult to be selectively oxidized to hypochlorous acid is solved. The electrode is stable in chemical properties, friendly to the environment, and cannot cause secondary pollution, and can be driven by solar energy to electrochemically synthesize a disinfectant without depending on power resources in ocean navigation, so that disinfection and sterilization of ship ballast water are realized, and the electrode is very worth promoting.

The present application relates to the technical field of catalyst, in particular to a kind of iron-doped manganese oxide catalyst and its preparation method and application.The present application is modified by sulfuric acid, manganese salt compound is dissolved in sulfuric acid aqueous solution, ferrous sulfate and potassium permanganate are added, stirring treatment is carried out, the product after treatment is separated, after washing multiple times, Fe / MnO2 Solid is obtained.The method enhances Fe-Mn bimetallic synergistic effect by sulfuric acid medium, significantly increases the number of active oxygen species on the surface of catalyst, so as to realize the efficient catalytic oxidation of toluene at low temperature.The preparation method of the present application is simple, low in energy consumption and cost saving.Under the condition of toluene concentration 2000mg / m 3 , space velocity 60000mL / (g·h), the catalyst prepared can realize toluene conversion rate ≥90% at 220℃~260℃, and has good industrial application prospect.

A high electron mobility transistor includes a substrate, a nucleating layer, a buffer layer, a channel layer and a barrier layer stacked in sequence, the buffer layer includes a first buffer region, a second buffer region and a third buffer region, the first buffer region includes a first nitride stack layer and a second nitride stack layer, the first nitride stack layer is disposed on the nucleating layer, and the second nitride stack layer is disposed on the channel layer. The second nitride stacking layer is arranged on the first nitride stacking layer; the second buffer region is arranged on the first buffer region and is doped with carbon and iron; the third buffer region is arranged on the second buffer region and is doped with carbon and iron; the carbon doping concentration of the third buffer region is greater than the iron doping concentration, the second nitride stack layer is doped with carbon and iron, and the carbon doping concentration of the second nitride stack layer is greater than the iron doping concentration.

The application provides a multifunctional nano drug delivery system based on iron-doped MOF and a preparation method and application thereof. The system comprises: an Fe / MOF core loaded with a chemotherapeutic drug and an HO-1 inhibitor; a PDA coating layer coated on the surface of the Fe / MOF core for providing near-infrared light heat conversion capability and surface modification interface; and E3 aptamer covalently coupled on the PDA coating layer, constituting a synergistic nano platform with active targeting, pH / NIR dual-responsive drug release, chemical kinetics therapy, ferroptosis sensitization, photothermal therapy and immune regulation functions. The nano system can realize efficient accumulation at the tumor site through active targeting mediated by E3 aptamer, and controllably release drugs under an acidic microenvironment or near-infrared light. A new strategy for multi-mechanism synergistic treatment is provided to overcome the multiple drug resistance and immunosuppression of mCRPC, and has important clinical application prospects.

The invention relates to a modified polydopamine composite material, a preparation method, application and a sensor. The modified polydopamine composite material comprises modified polydopamine and an iron-doped molybdenum oxide wrapping the modified polydopamine, the modified polydopamine is obtained by modifying polydopamine with 4-amino-2, 2, 6, 6-tetramethylpiperidinooxy free radicals (TEMPO-NH2), and the modified polydopamine is obtained by modifying the polydopamine with the 4-amino-2, 2, 6, 6-tetramethylpiperidinooxy free radicals (TEMPO-NH2). The invention also provides a preparation method of the modified polydopamine composite material. The invention also provides an application of the modified polydopamine composite material as a quenching agent. The invention also provides a sensor which comprises the modified polydopamine composite material disclosed by the invention. The invention solves the problem of low accuracy of the test result caused by unstable quenching effect when the existing electrogenerated chemical quencher is used for the sensor.

A hybrid energy system and process of preparation thereof to generate hydrogen and electricity simultaneously, which is cost effective. Provided is an iron-doped hollow carbon nanorod (FeHCNR) by utilizing polydopamine (PDA), as a potential bifunctional catalyst for empowering both hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). Further provided is a method of preparation of FeHCNR and use thereof in hybrid battery system for simultaneous generation of electricity and hydrogen.

The present invention discloses a graphene quantum dots (GQDs)-loaded iron-doped titanium-based metal-organic framework photocatalyst, a preparation method thereof, and an application thereof. The preparation includes the following steps: Step 1, dissolving a titanium source, an iron source, and 2-aminoterephthalic acid in a mixed solution of N,N-dimethylformamide and methanol for a mixed reaction, and washing and drying the product to obtain an iron-doped titanium-based metal-organic framework; Step 2, mixing and pyrolyzing citric acid monohydrate and graphite powder to obtain GQDs; Step 3, obtaining the iron-doped titanium-based metal-organic framework photocatalyst by ball-milling and mixing the iron-doped titanium-based metal-organic framework with the GQDs. Based on the support of the metal ion doping strategy, GQDs can further improve the photocatalytic performance of MOFs. The obtained catalyst has excellent catalytic activity and photo-stability. Moreover, the preparation method of the present invention is simple and easy to implement, providing a new option for the screening of catalysts for removing pollutants in the water environment and an important reference for the preparation of efficient photocatalytic materials.