360 results about "Iron doped" patented technology

The invention belongs to the technical field of electrocatalysis and particularly relates to an iron-doped bimetal phosphide electrocatalyst and a preparation method and application thereof. A hydroxide precursor synthesized by a hydrothermal reaction undergoes a phosphating reaction at a low temperature to produce a Ni1CoxFeyP nanosheet array electrocatalyst. The bimetal phosphide has low chargetransfer resistance and a reaction barrier for a hydrogen evolution reaction and has superior performances in the electrocatalytic hydrogen evolution reaction. The catalyst has a low cost. The preparation method is easy to operate and has simple processes. The electrocatalyst has excellent catalytic performances and provides the basic application research for the material in the field of electrocatalysis.

The invention provides an iron-doped tungsten trioxide photocatalyst. The photocatalyst comprises tungsten trioxide powder particles, and the tungsten trioxide powder particles comprise iron oxide with different contents and states. The photocatalyst of the invention has a significantly increased photocatalytic rate. The invention also provides a preparation method of the iron-doped tungsten trioxide photocatalyst; tungsten-containing and iron-containing compounds are used as precursors; the raw materials are finally transformed into forms of WO3 and iron oxide by processes of mixing the two compounds, grinding, high-temperature calcining and the like; and the iron oxide is distributed in WO3 in different forms so as to obtain the iron-doped tungsten trioxide photocatalyst. The raw materials used by the invention have low cost, and the equipment is simple and easy to operate; when the obtained photocatalyst is compared with simple tungsten trioxide and iron oxide, the photocatalytic activity in ultraviolet light and visible light is increased by several times.

The invention relates to an activated carbon fiber-loaded iron doped titanium dioxide photocatalyst and a preparation method thereof, belonging to photocatalyst and the preparation method thereof. The invention aims at providing the titanium dioxide photocatalyst which is loaded on an activated carbon fiber and is directly combined with iron, and the photocatalyst enables the iron doped titanium and the activated carbon fiber to cooperate with each other to act and has stronger capability of degrading and decomposing organic contaminant and better reusability. The photocatalyst is prepared from the activated carbon fiber to which titania and iron are attached, wherein the content of the iron is 0.01 to 0.15 percent according to mass percent; the preparation method is as follows: preparing colloidal sol containing iron and titanium, attaching the colloidal sol to the activated carbon fiber, and calcinating the activated carbon fiber at the constant temperature ranging from 900 to 950 DEG C; or preparing the colloidal sol into gel, and obtaining the finished product by calcinating the gel. The invention can be used for degrading organic contaminant in wastewater.

The invention discloses a thermal sensitive ceramic resistance material, a resistance element and a preparation method of the resistance element. The thermal sensitive ceramic resistance material is formed by iron doped with BaTiO3, and the molecular formula is BaTi FeO3; wherein x equals to 0.1 to 1; and the principal crystalline phase of the material is a hexagonal structure. The material of the invention is characterized by simple component design, wide regulating range of components and wide source of raw materials and is suitable for the preparation techniques of multiple ceramic materials; the material only contains one transition metal element of iron and the sintering temperature is lower than the volatilization temperature of the ferriferous oxide, thus effectively avoiding the volatilization problem of the principal component elements at high temperature in the preparation process. The material of the invention has good material constant value, is characterized by good stability, good consistency, good repetitiveness and controllable electrical characteristics such as resistance value, material constant, resistance temperature coefficient and the like, and is applicable to the temperature measurement, control and circuit compensation of automobiles, refrigerators and the like.

The invention discloses a preparation method for an iron-doped tungsten trioxide photoelectrode. The preparation method comprises the following steps: firstly, preparing an amorphous tungsten oxide film: feeding an ITO (Indium Tin Oxide) conductive glass as a work electrode, a platinum gauze electrode as a counter electrode and a saturated calomel electrode as a reference electrode into electrolyte for electrodeposition to obtain the amorphous tungsten oxide film and drying the amorphous tungsten oxide film for later use; secondly, doping iron by using an impregnating method: feeding the amorphous tungsten oxide film obtained in the first step into 0.005mol / L Fe(NO3)3 solution and impregnating for 20-40 minutes to obtain an iron-doped tungsten oxide film, taking out the iron-doped tungsten oxide film and flushing the iron-doped tungsten oxide film with distilled water and drying the iron-doped tungsten oxide film in air; and thirdly, calcining: feeding the iron-doped tungsten trioxide photoelectrode in the second step into a muffle furnace, calcining the iron-doped tungsten trioxide photoelectrode at high temperature of 450DEG C for 3 hours, cooling the calcined iron-doped tungsten trioxide film at room temperature and then taking out to obtain the iron-doped tungsten trioxide photoelectrode. The photoelectric conversion efficiency and the photoelectric catalytic activity of the iron-doped tungsten trioxide photoelectrode are remarkably improved; the adopted experiment equipment is simple and easy to operate; and the used raw materials are abundant in natural word and low in cost and also have the advantages of environment friendliness and the like.

The invention relates to an X-shaped zeolite molecular sieve and a method for preparing thereof, relating to a field of zeolite molecular sieve material; The X-shaped zeolite molecular sieve is a magnetic iron-doped X-shaped zeolite molecular sieve; magnetic ferroferric oxide is formed in the zeolite lattice, wherein, quality percentage of Fe occupying the molecular sieve is 1.89 percent to 3.48 percent. The preparing method comprises the steps that, iron-doped X-shaped zeolite molecular sieve is firstly compounded and then the magnetized magnetic iron-doped X-shaped zeolite molecular sieve is prepared through hydrogen reduction; the method results in a structure of Fe3O4 formed in frame of the iron-doped X-shaped zeolite molecular sieve. The magnetic iron-doped X-shaped zeolite molecular sieve has strong magnetism and magnetic stability, which not only solves the problem that the existing powdery zeolite molecular sieve is difficult to be recycled in reaction solution, and further improves absorption property of the sieve, but also enlarge application range of the zeolite molecular sieve, thereby allowing the zeolite molecular sieve to be applied to catalytic reaction in which iron acts as the catalyst.

The invention discloses a preparation method of an iron-doped nickel based composite for electrochemical oxygen evolution. The method mainly comprises the steps that the surface of a metallic nickel substrate is cleaned, an alkaline electrolyte is prepared, the concentration of metallic alkaline compounds is 100-300 g / L, and the pH value is controlled to be higher than 14; then the cleaned nickel substrate is used as a working electrode to be soaked in the alkaline electrolyte, a metallic iron electrode with the same area is used as a counter electrode and is added into the alkaline electrolyte with the nickel substrate, and excess iron elements are added into the alkaline electrolyte at the same time; and finally, the surface of the nickel electrode is subjected to cyclic polarization for 1-24 hours through an electrochemical technology, and then the iron-doped nickel based compound composite on the surface of the nickel substrate can be obtained. The method is low in raw material cost, simple in process, easy to operate, low in production cost and short in production cycle, has the high electrochemical oxygen evolution catalytic activity and is suitable for industrial mass production.

An oxide semiconductor doped with a transition metal and exhibiting room-temperature ferromagnetism is disclosed. The transition metal-doped oxide semiconductor is preferably manufactured in powder form, and the transition metal is preferably evenly distributed throughout the oxide semiconductor. The preferred embodiments are iron-doped tin dioxide and cobalt-doped tin dioxide. Gases may be detected by passing them across a material and measuring the change in magnetic properties of the material; the preferred material is iron-doped tin dioxide.

The invention relates to a preparation method of a porous iron-doped titanium dioxide photocatalyst, the preparation method belongs to the technical field of photocatalyst and comprises the following steps: solid hexahydrated ferric chloride FeCl3. 6H2O and tetrabutyl titanate Ti(OC4H9)4 are sequentially added in an ethylene glycol solvent for carrying out the stirring and the reflux, and solution is further cooled to the room temperature; the solution after the cooling is arranged in a centrifuge for carrying out the separation, then the solution is arranged in anhydrous ethanol for carrying out a plurality of times of dispersion and washing, thereby obtaining metal alkoxide solids; the drying treatment and the heating treatment are further carried out to obtain solid powder of the porous iron-doped titanium dioxide photocatalyst. The porous iron-doped titanium dioxide photocatalyst which is prepared and obtained by the preparation method of the invention has high photocatalytic activity in the reaction of the degradation of molecules of organic pollutants, the activity thereof is higher than an industrial product of nano-titanium dioxide photocatalyst P25, the porous iron-doped titanium dioxide photocatalyst also has high stability and can be recycled; compared with the catalysts in the prior art, the activity is more durable.

The invention discloses a process for preparing iron-doped titanium dioxide powder materials through a sol-gel method. The process includes five reaction processes and has the advantages of having low raw material cost, mild reaction conditions, low energy consumptions and having no coarse particle aggregation members produced and the like. According to the process for preparing iron-doped titanium dioxide powder materials, the iron-doped titanium dioxide powder materials enable the sunlight induction range to be expanded and enable the sunlight absorption wavelength to perform a redshift and have a good prospect in manufacturing the electrodes of the solar battery.

The invention discloses a method for preparing iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method comprises the steps of preparing titanium tetrachloride raw material to be hydrosol, aging the hydrosol, adding water for dilution, doping water-soluble iron salt, raising temperature to hydrolyze sol and produce precipitate, filtering the precipitate, using water to wash the precipitate, drying the precipitate, obtaining iron-doped nanometer titanium dioxide powder, mixing and then ball-milling nitrogen salt and the iron-doped nanometer titanium dioxide powder, calcining the ball-milled powder, and cooling the powder to obtain the iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method combines a chemical method with a physical method so as to allow iron to uniformly enter a crystal lattice structure of titanium dioxide on the one hand, and to uniformly distribute nitrogen in surface layers of nanometer particles, particularly non-crystallization layers on the other hand. The iron-doped nitrogen-doped nanometer titanium dioxide powder can improve the photocatalysis efficiency of titanium dioxide on the one hand, and can expand the photoresponse wavelength of titanium dioxide so as to greatly improve photocatalysis properties.

The invention discloses an iron-doped cerium dioxide photocatalyst and a preparation method thereof, a molecular formula of the iron-doped cerium dioxide photocatalyst is FexCe1-xO2-0.5x, wherein X is 0.05-0.2. According to the preparation method, cerium nitrate, ferric nitrate and sodium carbonate are taken as initial raw materials, a coprecipitation method is employed to obtain flake-like FexCe1-xO2-0.5x, in the preparation process, x value is changed to obtain the FexCe1-xO2-0.5x with different composition. Doping of iron has obvious influence on CeO2 forbidden band width, the FexCe1-xO2-0.5x has good photocatalysis performance, the preparation method and the required equipment are simple, and industrial production can be easily realized.

An iron-doped high-electron-mobility transistor (HEMT) structure includes a substrate, a nucleation layer over the substrate, and a buffer layer over the nucleation layer. The gallium-nitride buffer layer includes a iron-doping-stop layer having a concentration of iron that drops from a juncture with an iron-doped component of the buffer layer over a thickness that is relatively small compared to that of the iron-doped component. The iron-doping-stop layer is formed at lower temperature compared to the temperature at which the iron-doped component is formed. The iron-doped HEMT structure also includes a channel layer over the buffer layer. A carrier-supplying barrier layer is formed over the channel layer.

Disclosed is a chemical mechanical polishing (CMP) slurry having a superior polishing efficiency as well as being capable of effectively converting a metal layer to be polished into a metal oxide layer. The CMP slurry composition includes an abrasive, an oxidizing agent, an iron-doped colloidal silica, and water. Preferably, the amount of the iron-doped colloidal silica is 0.0001 to 0.5 weight % with respect to the total CMP slurry composition, and the iron-doped colloidal silica is produced by reacting a silica salt with an iron salt in an aqueous solution state. The preferable amount of Si contained in the silica salt is 2 to 10 times of the amount of Fe contained in the iron salt by mole ratio.

The invention discloses a preparation method and application of an iron doped cobalt diselenide compound nitrogen doped carbon material. The method is characterized in that a metal organic framework ZIF-67 is used as the precursor, ferric ion is utilized to perform etching to obtain iron modified Fe-ZIF-67, selenium steam is used to perform carbonization and selenylation on the Fe-ZIF-67 to obtaina nitrogen doped porous carbon loaded iron doped cobalt diselenide (Fe-CoSe2@NC) powdered electrode material. The Fe-CoSe2@NC is prepared into slurry, and conductive carbon fiber paper is coated withthe slurry to obtain a Fe-CoSe2@NC / CFP electrode. The electrochemical catalysis hydrogen production performance indexes of the Fe-CoSe2@NC / CFP electrode include: the Tafel slope is 40.9mV / decade; overpotential for reach the current density of 10mA / cm<2> is -0.143V(vs RHE). Meanwhile, the assembled electrode is excellent in electrochemical stability and does not have evident voltage fluctuation ina 48-hour constant-current stability test. The synthesizing method of the compound electrode is simple, efficiency, green, environmentally friendly, low in raw material and synthesizing costs, suitable for industrial application using electrochemical water decomposition to produce hydrogen and extensive in scientific significance.

The invention discloses an iron-doped zirconium oxide polishing solution, and relates to the technical field of preparation of polishing materials. The iron-doped zirconium oxide polishing solution is prepared from water-soluble inorganic zirconium salt, soluble trivalent ferric salt, alkali, zirconium carbonate, additives and a pH value modifier. The method comprises the preparation steps of material preparation, symbiotic solution preparation, symbiotic precipitate preparation, washing, drying, roasting, grinding and stirring dispersion; the method has the characteristics that the cutting rate is good and no obvious defects are generated on the surface of a polished material; the iron-doped zirconium oxide polishing solution prepared by using the method is suitable for the processing field of high-grade optical instruments, and particularly can be applied to polishing flexible glass.

The invention discloses a preparation method of an oxygen evolution catalyst for transition metal group metal sulfide. The preparation method includes performing self-growth of a nickel hydroxide nanosheet array on foamed nickel, adding a potassium ferricyanide solution with a certain concentration, growing a Prussian blue derivative on the nanosheet array, adding sodium sulfide, and preparing aniron-doped porous nickel sulfide nanosheet by the aid of hydrothermal vulcanization and etching. The iron-doped porous nickel sulfide nanosheet maintains high oxygen evolution activity, the whole reaction process is simple, and the method is easy to operate and beneficial to industrial production.

The invention relates to a single-step hydrothermal micro-emulsion method for preparing iron-doped nano titanium dioxide powder. The single-step hydrothermal micro-emulsion method specifically comprises the following steps of constituting water-in-oil W / O type micro-emulsion by using alkylphenol ethoxylates (OP-10) as a surfactant, using n-butyl alcohol (C4H9OH) as a cosurfactant, using cyclohexane (C6H12) as an oil phase, using butyl titanate (Ti(OC4H9)4) as a titanium source and using hydrochloric acid (HCl) liquor of ferric chloride (FeCl3.6H2O) as a water phase; uniformly stirring, and transferring into a lined polytetrafluoroethylene reaction kettle for keeping heat for 1 hour-5 hours at a constant temperature of 120 DEG C-160 DEG C, naturally cooling to the room temperature; and washing, separating and drying to prepare the iron-doped nano titanium dioxide powder. According to the single-step hydrothermal micro-emulsion method disclosed by the invention, the iron-doped titanium dioxide is obtained by directly reacting in a low-temperature liquid phase, the preparation process is simple, and the prepared iron-doped nano TiO2 powder is controllable in dimension, uniform in size and provided with average diameter of 10 nm-25 nm; moreover, the iron-doped nano TiO2 powder is expected to be widely applied in the fields such as hydrogen production by photodecomposition of water, degradation of organic pollutants, and the like.

The invention relates to a semiconductive ceramic material and especially relates to a negative temperature coefficient (NTC) thermistor material. The material can adjust a room temperature resistance value and a material constant value of a thermistor element through change of doped microelement content. The NTC thermistor material mainly comprises a simple oxide, can be sintered to form ceramic at a temperature of about 1200 DEG C and is suitable for sintering molding of a thermal sensitive ceramic element, a film thermal sensitive element and a low temperature co-fired laminated heat sensitive component. The heat sensitive thermistor material has the characteristics of good stability, good consistency and good repeatability, has controllability of electric characteristics such as a resistance value, a material constant and a resistance temperature coefficient, is suitable for temperature measurement, temperature control and line compensation and can be used in the field of circuit and electronic component protection and flow velocity, flow and ray measurement apparatus and application.

The invention relates to an iron-doped molybdenum disulfide coating material and a preparation method and application thereof. The iron-doped molybdenum disulfide coating material comprises molybdenumdisulfide nanosheets which grow on the surface of a metal substrate in situ and are doped with an iron element, and the doping content of the iron element in the iron-doped molybdenum disulfide coating material is 1-4wt%. An iron-doped molybdenum disulfide layer is constructed on the surface of medical titanium alloy, and thus, the antibacterial effect is improved obviously.

The invention discloses a preparation method of an iron doped carbon quantum dot / titanium dioxide composite photocatalyst and a formaldehyde degradation method. The preparation method comprises following steps: (1) preparing iron doped carbon quantum dots; and (2) preparing the iron doped carbon quantum dot / titanium dioxide composite photocatalyst. The prepared iron doped carbon quantum dot / titanium dioxide composite photocatalyst can be used to catalytically degrade formaldehyde in the presence of visible light. An interface charge transfer effect is utilized to construct iron doped carbon quantum dots; iron doping can enhance the photocatalytic activity of the composite photocatalyst, because the work content of carbon quantum dots is reduced by the iron doping, a great potential barrieris formed between iron doped carbon quantum dots and titanium dioxide, and the photocatalytic performance of iron doped carbon quantum dots / titanium dioxide is enhanced. The introduction of iron doped carbon quantum dots greatly strengthens the catalytic performance of titanium dioxide in the presence of visible light. After 180 minutes of irradiation of visible light, the degradation rate of formaldehyde (3-30 mg / L) is increased to 85% or more, compared with 40% (titanium dioxide is taken as the catalyst).

The invention relates to an iron-doped silica sol composite abrasive grain, and a polishing solution composition and a preparation method thereof. The preparation method of the composite abrasive grain comprises the following steps: adding a 0.29 wt% ferric chloride solution and a 2-3 wt% dilute silicic acid solution in a mass ratio of 1:1 into a silica crystal seed under certain reaction conditions, and doping the iron element into the silica sol abrasive grain in the silica sol growth process to form the uniform stable iron-doped silica sol composite abrasive grain, wherein the doping mass percent is 0.1-5.0%. The physical structure of the composite abrasive grain is nano spherical. The chemical composition of the abrasive grain contains the iron element capable of performing chemical actions with the sapphire and silicon chip surface, thereby enhancing the polishing rate. When being used for polishing the sapphire substrate and silicon chip, the polishing solution provided by the invention can effectively lower the surface roughness and microroughness of the sapphire and silicon chip and enhance the polishing rate of the sapphire and silicon chip.

The invention relates to a preparation method for a manganese-lithium phosphate and carbon nano tube nanocomposite. The method comprises the following processes: dripping phosphoric acid into a lithium hydroxide solution to prepare lithium phosphate, then adding manganese salt and ferric salt into a lithium phosphate dispersing solution and stirring uniformly to obtain a precursor solution, conducting a heat seal reaction to obtain manganese-lithium phosphate or iron-doped manganese-lithium phosphate, adding the manganese-lithium phosphate or iron-doped manganese-lithium phosphate and cobalt nitrate into deionized water, mixing, then dripping a sodium hydroxide solution, and washing, filtering in a suction manner, grinding, calcinating, reducing and growing a precipitate to obtain the manganese-lithium phosphate and carbon nano tube nanocomposite or an iron-doped manganese-lithium phosphate and carbon nano tube nanocomposite. According to the nanocomposite prepared with the method, a carbon nano tube grows uniformly on the manganese-lithium phosphate, the degree of graphitization is high, the process is simple, the defect of low electronic conductivity of manganese-lithium phosphate or iron-doped manganese-lithium phosphate is overcome, the charge and discharge properties of the nanocomposite are improved, and the application prospect is broad.

The invention discloses an HEMT epitaxial structure, which structurally comprises a substrate (10), a low-temperature GaN buffer layer (20), an undoped GaN high-resistance layer (30), an AlN isolation layer (40), an undoped GaN channel layer (50), a barrier layer (60) with the Al content thereof to be changing in the stepped manner, and an AlN barrier layer (70). The undoped GaN high-resistance layer and the AlN isolation layer grow after the annealing treatment of the low-temperature GaN buffer layer. Compared with the carbon-doped manner or the iron-doped manner, the crystallization quality is effectively improved and the memory effect caused by ion doping is avoided. Meanwhile, the structure is provided with multiple channels, wherein two main channels are formed at the interfaces of an AlN barrier layer and an undoped GaN channel layer with the barrier layer with the Al content thereof to be changing in the stepped manner, and multiple auxiliary channels are formed at the interface of the barrier layer with the Al content thereof to be changing in the stepped manner. Compared with a conventional HEMT device, the current driving capability of the HEMT device is enhanced. The gate leakage current of the HEMT epitaxial structure and the leakage current of the buffer layer are small, and the current driving capability is strong. Therefore, the HEMT epitaxial structure can be applied to the field of high-power electronic devices. In addition, the invention further provides a preparation method of the HEMT epitaxial structure.

The invention provides a preparation method of an iron-doped nanometer zinc oxide crystal, aiming at overcoming the shortcoming of the traditional photocatalytic property and particularly solving the problem that the photocatalytic activity is hardly available in a visible light region. The preparation method has the advantages of simplicity, low cost and rapid reaction speed; and the nanometer zinc oxide prepared by the invention has very good photocatalysis capability in the visible light and the grain size of 5 nanometers to 50 nanometers and can be used for preparing high-performance materials related to solar energy.

A method for performing a Fischer-Tropsch process using as a catalyst (precursor) an iron-containing layered material selected from the group consisting of layered materials in which iron is present in the layered structure as divalent and / or trivalent metal (group 1), iron-doped layered materials (group 2), calcined iron-doped layered materials (group 3), and calcined layered materials in which iron is present in the layered structure as divalent metal (group 4). The term “layered material” includes anionic clays, layered hydroxy salts, cationic clays, and cationic layered materials.

The invention discloses a multilevel-structure supported nano gold catalyst and a preparation method thereof, belonging to the technical field of multilevel-structure nano material catalysis. The catalyst consists of the following elements in percentage by mass: 35.5-45.5% of titanium, 55.5-65.5% of oxygen, 0.1-0.4% of iron and 1.0-5.0% of gold. The nano gold catalyst is prepared through a precipitation method by taking iron-doped anatase TiO2 nano-lamella multilevel microspheres with a high (001) crystal face exposure rate as a carrier, wherein strong metal-carrier interaction exists between nano gold and the carrier, and the catalyst is suitable for alpha, beta-unsaturated aldehyde / ketone liquid phase selective hydrogenation reaction. When the reaction temperature is 120 DEG C and the pressure is 1.0MPa, H2 is used as a reducing agent for reacting for 2 hours, the conversion rate of a catalytic cinnamic aldehyde hydrogenation reaction is 75-80%, and the selectivity of cinnamic alcohol is 60-70%.

The invention discloses a rare earth iron-doped transparent oxygen fluorine germanate microcrystalline glass and a preparation method thereof. The transparent microcrystalline glass comprises the following components by mole percentage: 38-60 percent of GeO2, 4-26 percent of Al2O3, 0-8 percent of Ga2O3, 15-40 percent of CaF2, 0-12 percent of MF, 0-6 percent of ErF3, 0-8 percent of YbF3 and 0-4 percent of PrF3, wherein M is one or more of Li+, Na+ and K+. The preparation method comprises the steps of pouring by melting method to obtain matrix glass and carrying out special thermal treatment on the matrix glass to obtain the microcrystalline glass containing CaF2 crystalline phase in nanometer level. The transparent oxygen fluorine germinate microcrystalline glass is environment-friendly, has stable physicochemical property and does not contain toxic Pb element, and has high transparency from visible area to near-infrared and intermediate infrared areas and excellent active optics property. The invention can be used in the field of optical communication, display, storage, and the like.

The invention discloses a method used for preparing iron-doped SBA-15 mesoporous molecular sieve under neutral conditions via one-step method, and belongs to the technical field of mesoporous molecular sieve synthesis. According to the method, Fenton reagent is added into an ethyl orthosilicate aqueous solution for hydrolysis, an obtained product is uniformly mixed with an organic template agent P123 aqueous solution, free radical reaction is induced by hydroxyl free radicals generated by Fenton reagent, the presence of a ferric salt is beneficial for realizing of charge matching effect and self-assembling between the organic template agent and an inorganic silicon source under neutral conditions, so that preparation of the Fe-SBA-15 mesoporous molecular sieve material is realized. According to the method, the Fe-SBA-15 mesoporous molecular sieve with excellent order degree is prepared via one-step method without adding inorganic strong acid, so that synthesis of metal-doped mesoporous materials under soda acidic or alkaline conditions or via complex post-treatment is avoided. The method is capable of providing industrialized production of iron-doped SBA-15 mesoporous molecular sieve with new ideas, providing widened industrialized applications of mesoporous molecular sieve materials with conditions, and possesses industrialized application value.

The invention discloses a potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as a sensitive electrode and a manufacturing method of the potentiometric hydrogen sensor. The potentiometric hydrogen sensor uses La<1-x>Sr<x>Cr<1-y>FeyO<3-delta> as a sensitive electrode, Pt as a reference electrode, and YSZ or GDC as a solid electrolyte, wherein x is more than or equal to 0.1 and less than or equal to 0.6, and y is more than or equal to 0.3 and less than or equal to 0.7. The potentiometric hydrogen sensor disclosed by the invention uses a perovskite structure oxide La<1-x>Sr<x>Cr<1-y>FeyO<3-delta>, which has relatively good electrochemical catalytic activity to hydrogen, as a sensitive electrode, so that the sensor can have a relatively high response value to hydrogen; and YSZ or GDC is used as an electrolyte, so that the gas sensitivity and long-term stability of the sensor can be improved.