202 results about "Double perovskites" patented technology

The present invention provides a material suitable for use in a solid oxide fuel cell, wherein the material is of an, optionally doped, double perovskite oxide material having the general formula (I): (LnaXb)e(Z1cZ2d)fOg (I) wherein Ln is selected from Y, La and a Lanthanide series element, or a combination of these and X also represents an element occupying the A site of a perovskite oxide and is selected from Sr, Ca and Ba, and Z1 and Z2 represent different elements occupying the B site of a perovskite oxide and are selected from Cr, Mn, Mg and Fe, and wherein a has a value from 0 to 1, preferably 0.7 to 1.0, b has a value of from 1 to 0, preferably 0.3 to 0, and each of c and d has a value of from 0.25 to 0.75, provided that a+b has a value of 1, and c+d, has a value of 1, and wherein e has a value of from 0.8 to 1, wherein f has a value of from 0.8 to 1, and g has a value of from 2.5 to 3.2. Also provided are SOFCs having an electrode or functional layer of a material or containing a material of the invention, as well as mixed ionic / electronic conducting membranes suitable for use in a syngas reactor or oxygen separator, comprising a layer of a double perovskite material of the invention, and a method of oxidising a fuel in an SOFC having an anode of a double perovskite material of the invention.

The invention discloses double-perovskite structured red fluorescent powder as well as a preparation method and application thereof, belonging to the field of fluorescent materials. The chemical formula of the fluorescent powder can be shown as Ln2-xAMO6:xEu and meets the following conditions: Ln is one, two or three of La, Gd and Y; A is one, two or three of Li, Na and K; M is one, two or three of Sb, Nb and Ta; and Eu is a luminescent center and is doped in the Ln position and the doping value x is 0.01-1.0. The fluorescent powder disclosed by the invention can emit fluorescence of 570-640 nm under the excitation of a green light chip (528-533 nm), a blue light chip (460-470 nm) or a near-ultraviolet light chip (390-399 nm), and red fluorescence is of 600-620 nm. The fluorescent powder can be used for white LED (light-emitting diode) and related display and lighting devices, has a simple preparation process, stable chemical properties and excellent luminescent performance, and is ideal fluorescent powder used for white LED.

The invention relates to double perovskite type inorganic nano fiber and a preparation method thereof and belongs to the field of inorganic nano fiber materials. The preparation method comprises the following steps: mixing polyvinylpyrrolidone with a solvent to obtain a spinning precursor solution, and performing electrostatic spinning, preoxidation and carbonization to the spinning precursor solution to obtain the double perovskite type inorganic nano fiber; the spinning precursor solution comprises the following components in mass percent: 10% to 20% of inorganic salt, 10% to 30% of polyvinylpyrrolidone and the balance of solvent, wherein the inorganic salt is the mixture of lanthanum salt, cobalt salt and metal salt III, the molar ratio of the lanthanum salt, the cobalt salt and the metal salt III is 2:1:1, and the metal salt III is nickel salt, ferric salt or manganese salt. The invention has the advantages that the preparation method is simple and easy to implement, the raw material consumption is low, the product purity is high, and the obtained double perovskite type inorganic nano fiber has a stable one-dimensional structure, is relatively high in draw ratio and uniform in diameter.

The invention relates to a preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder. The preparation method is implemented through gelatinization and redox reaction of metal nitrate, tungsten ammonium molybdate, citric acid and ethylene diamine tetraacetic acid (EDTA) by a sol gel combustion synthesis method, wherein the citric acid and the EDTA serve as complexing agents. The prepared powder is a double perovskite component shown in the following formula: (A1-xMex)2B(Mo1-yWy)O6 or A2(B1-xMex)(Mo1-yWy)O6, wherein A is at least one of Ba, Sr or Ca; B is one of Ca, Mg, Ni, Fe, Co or Zn; A and B are not Ca at the same time; Me is one or two of rare elements or transition metal elements; x is more than or equal to 0.0 and less than or equal to 0.5; and y is more than or equal to 0 and less than or equal to 1. According to the prepared powder, single-phase ion-doped tungsten molybdenum substituted double perovskite oxide powder can be obtained under the conditions of low temperature and short heat-preserving time; test period is greatly shortened; cost is greatly reduced; and the method is particularly suitable for preparing rare earth-doped luminescent materials, magnetic resistance materials and the like with the structure type.

The invention belongs to the technical field of the semiconductor photoelectric detection, and specifically relates to a deep-ultraviolet detector based on a lead-free double-perovskite film, and a preparation. The structure is composed of a double-side polished Al2O3 substrate, n-type bandwidth gap electronic transmission layer, a Cs2AgBiBr6 light absorption layer and a contact electrode. On theone hand, the instability and the lead positioning and like adverse factors of the traditional perovskite structure are overcome; on the other hand, the fast separation and transmission of the photo-generated carrier can be realized by means of the energy band matching between the bandwidth gap electronic transmission layer and the Cs2AgBiBr6 light absorption layer, and the light detection range of the device can be extended to the deep ultraviolet region from the visible light. The preparation method of the device disclosed by the invention is simple and practical, and environment-friendly; the prepared photoelectric detector has high detection rate and response speed, and has very important application value.

A superconducting article includes a substrate having a biaxially textured surface. A biaxially textured buffer layer, which can be a cap layer, is supported by the substrate. The buffer layer includes a double perovskite of the formula A2B′B″O6, where A is rare earth or alkaline earth metal and B′ and B″ are different transition metal cations. A biaxially textured superconductor layer is deposited so as to be supported by the buffer layer. A method of making a superconducting article is also disclosed.

The invention discloses a double-perovskite composite metal oxide catalyst and a preparation method and application thereof and belongs to the technical field of atmospheric pollution treatment. The condensed structural formula of the double-perovskite composite metal oxide catalyst is A2B2O6, wherein A is La, Sr or Ce, and B is Mn, Fe, Co, Cu or Ni. The double-perovskite composite metal oxide catalyst has the advantages that the catalyst is excellent in high temperature resistance, water resistance and chlorine resistance and applicable to effective degradation of CVOCs under an industrial high-temperature environment; the catalyst can achieve complete oxidization of industrial typical CVOCs (1,2-dichloroethane) under reaction temperature of 500-550 DEG C, reaction air speed of 20000-30000h<-1> and oxygen concentration of 10-20%; meanwhile, by regulating the loading capacity of transition metal oxide, the oxidizing efficiency of the catalyst can be increased effectively, and the selectivity of the reaction product CO2 can be increased greatly. The preparation method of the catalyst is simple, cheap in raw material and promising in industrial application prospect.

The present invention relates to a semiconductor device comprising a semiconducting material, wherein the semiconducting material comprises a compound comprising: (i) one or more first monocations [A]; (ii) one or more second monocations [BI]; (iii) one or more trications [BIII]; and (iv) one or more halide anions [X]. The invention also relates to a process for producing a semiconductor device comprising said semiconducting material. Also described is a compound comprising: (i) one or more first monocations [A]; (ii) one or more second monocations [BI] selected from Cu+, Ag+ and Au+; (iii) one or more trications [BIII]; and (iv) one or more halide anions [X].

The invention discloses a preparation method and an application of an Sb-doped Cs2AInCl6 double perovskite material. In the Sb-doped Cs2AInCl6 double perovskite material, A is Na, K and Rb, a cesium-containing compound, an A-containing compound, an antimony-containing compound and an indium-containing compound are used as reaction reagents, concentrated HCl is used as a solvent, the Sb-doped Cs2AInCl6 double-perovskite material is prepared, and the influence of the reaction temperature on the luminous efficiency of the Cs2AInCl6 double-perovskite material is explored. The Sb-doped Cs2AInCl6 double-perovskite material prepared by adopting a solvothermal method is good in crystallinity, high in quality, and capable of being rapidly synthesized in quantity and simple in process; and doping ofdifferent concentrations can be effectively realized by adjusting the feeding ratio of Sb. The material provided by the invention has good stability and high quantum efficiency (PLQY), is suitable for industrial production, and has a wide application prospect in the fields of illumination, backlight batteries, display screens, solar cells and the like.

The invention discloses a double perovskite single crystal photodetector and a preparation method thereof. The double perovskite single crystal photodetector comprises a substrate, wherein the substrate is provided with a double perovskite single crystal, electrodes and a silver glue in sequence, the two electrodes are respectively connected to a conductive gold wire, the double perovskite singlecrystal is in a double perovskite structure formed by adding different cations in a solution of the perovskite growth single crystal, and each of the added cations is one of methylamine ion (MA+), formamidine ion (FA+), phenethylamine ion (PEA+), NH4+, butylamine ion (Ba+), K+, Rb+ and Tl+. By doping different cations in the double perovskite single crystal photodetector, the carrier concentrationof the device is increased under illumination conditions, which leads to an increase in photocurrent and enhances the detection performance of the photodetector.

Relating to the technical field of catalysts, the invention discloses a double perovskite type metal oxide catalyst and a preparation method thereof to solve the problems of low catalytic activity and poor high-temperature stability o existing LaMnO3. The general formula of the double perovskite type metal oxide catalyst is: La1-xMxD1-yMnyO3, wherein x=0-0.6, y=0.7-1, M is alkali metal ion or alkaline earth metal ion, and D is +1, +2 or +3 valence metal ion. According to the double perovskite type metal oxide catalyst provided by the invention, the M ion and D ion are introduced to adjust the composition and structure of the perovskite metal oxide and increase the specific surface area, thereby enhancing the catalytic activity and high temperature stability of the catalyst. The catalyst provided by the invention is mainly applied to catalytic combustion of methane.

The invention discloses a perovskite solar cell taking a double perovskite material as an absorption layer. The perovskite solar cell comprises a transparent conductive substrate, an electron transport layer, a double perovskite absorption layer, a hole transport layer and a metal electrode from bottom to top. The double perovskite adopts a semiconductor material with a molecular formula of A2BIBIIIX6, wherein A is one or more of K<+>, Rb<+> and Cs<+>, BI is one or more of Cu<+>, Ag<+>, Au<+>, Li<+>, Na<+>, K<+>, Rb<+>, Cs<+> and In<+>, and BIII is one or more of As<3+>, Bi<3+>, Rh<3+>, Sb<3+>, Cr<3+>, Co<3+>, Ga<3+>, Fe<3+>, Ru<3+>, In<3+>, Ir<3+>, Au<3+> and Y<3+>. Compared with an existing perovskite solar cell, the perovskite solar cell is high in stability, free of toxic elements andcapable of being used for communication, traffic photovoltaic systems and user solar energy.

The invention relates to double-perovskite tungsten molybdate red fluorescent powder for a white light LED and a preparation method of the double-perovskite tungsten molybdate red fluorescent powder. The chemical expression of the red fluorescent powder is AA<II>1-xLi<+>B<II>O6:xEu<3+>, wherein Eu<3+> is an active ion doped to an A<II> site, and the doping amount x is more than or equal to 0.01 and less than or equal to 0.6; A is any one of or a combination of more of divalent alkaline earth metal ions Ca<2+>, Sr<2+> and Ba<2+>; A<II> is any one of or a combination of more of trivalent rare-earth ions La<3+>, Gd<3+>, Y<3+> and Sc<3+>; B<II> is any one of or a combination of W<6+> and Mo<6+>; and the red fluorescent powder is prepared by adopting a low-temperature combustion method. The double-perovskite tungsten molybdate red fluorescent powder disclosed by the invention can be efficiently excited by near ultraviolet and blue light chips, the luminous efficiency is improved, the preparation process is simple, and the synthesis temperature is low, so that the double-perovskite tungsten molybdate red fluorescent powder is ideal red fluorescent powder suitable for the white light LED.

The invention discloses a double-perovskite type intermediate temperature solid oxide fuel cell anode material and a preparation method and belongs to the technical field of solid oxide fuel cells. The molecular formula of the anode material is A2Co<1-x>MxFeO<5+delta>, wherein A is Ca, Sr or Ba element, M is Mo, Nb, Ti, Ni, Cu or Al element, and x is greater than 0 and smaller than 1. The preparation method comprises the following steps: required solonetz nitrate and the like as well as a complexing agent are uniformly mixed in an aqueous solution to obtain gel, the gel is oven-dried, the oven-dried gel is calcined at 500-700 DEG C and 800-950 DEG C respectively, and the calcined powder is sintered at 1100-1300 DEG C for 10-20 hours to obtain the corresponding one-phase double-perovskite type anode material. The anode material has the characteristics of low cost, excellent conductivity, low coefficient of thermal expansion and chemistry compatibility with electrolyte material and is the intermediate temperature solid oxide fuel cell anode material having excellent application prospect.

The invention relates to a high-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6- Delta anode material and a preparation method thereof, which belong to the field of the fuel cell. B site of double perovskite (A2BB'O6) solid oxide fuel cell anode material Sr2MgMoO6 is doped with aluminum to form a mixed conductor of double perovskite structure. Then binder of defined quantity is added to the B site doped Sr2AlxMgxMg1-xMoO6(x=0.01 to 0.1) powder to be compressed to sample strips under a given pressure after being uniformly mixed, the sample strips are sintered at high temperature under the air atmosphere and then are reduced under the low-oxygen condition, the measurement of the conductivity is performed after the reduction, the conductivity is 276 percent higher than that before the doping, thus favoring the improvement of the working property of the electrode. At the same time, the doped Sr2AlxMg1-xMoO6 has higher carbon sedimentation resistance and higher sulfur poisoning resistance than that of the traditional anode material Ni / YSZ.

The utility model discloses a rare earth catalyst used in preparation of syngas through biomass and coal in supercritical water in co-gasification mode, in particular to a rare earth catalyst used for catalyzing gasified biomass to coal to prepare the syngas in the supercritical water. The rare earth catalyst selected in the method is rare earth double-perovskite type composite oxide containing lanthanum, cobalt and manganese. The catalyst is used for catalyzing the supercritical water co-gasification reaction of the biomass and the coal to obtain the syngas with the content reaching 63.4%, so that content of carbon monoxide in gas products increases, and content of carbon dioxide is remarkably reduced.

The invention discloses a novel undoped and silver-doped non-lead full-inorganic sodium-indium-based double perovskite nanocrystal material, which is prepared from the following steps: adding a cesium-containing compound, sodium acetate, indium acetate and silver acetate into a flask, adding 1-octadecene, oleic acid and oleylamine, stirring and mixing, and vacuumizing at 100-110 DEG C for 1 hour;introducing nitrogen, heating to 180-185 DEG C at the speed of 4-8 DEG C / min, injecting a chlorine-containing compound at the temperature of 165-170 DEG C, quickly performing ice bath to room temperature when the temperature is 180 DEG C, centrifuging to remove supernatant, washing twice with methylbenzene, centrifuging to remove supernatant, dispersing precipitates into n-hexane, and centrifugingto remove the precipitates to obtain nanocrystal colloid. According to the invention, the preparation method is simple, the toxicity problem of the lead-based perovskite is solved, the stability of the perovskite nanocrystal is improved through silver doping, the fluorescence property of the perovskite nanocrystal is improved, and the perovskite nanocrystal material has a good application prospect in the photoelectric field.

The invention discloses a multi-mode luminous lead-free double perovskite material and a preparation method thereof, and belongs to the technical field of perovskite scintillator materials. The multi-mode luminous lead-free double perovskite material has a chemical formula of Cs2NaBiCl6: Yb<3+>,Er<3+>. The Cs2NaBiCl6 lead-free double perovskite material is synthesized by utilizing a hydrothermal method, so that the problems of poor toxicity and stability of lead-based perovskite can be solved; by doping rare earth ions ytterbium and erbium, high-brightness green light emission is realized under the excitation of a 980 nm laser, the light emission color is tunable under the excitation of 375 nm ultraviolet, excellent green light emission is realized under the excitation of X-rays (tube voltage of 40 KV and tube current of 30 mA), and relatively high brightness can still be kept after 60 times of continuous circulation (3600 s) radiation of the high-energy X-rays; the lead-free double perovskite material disclosed by the invention is a multi-mode excited luminous fluorescent material, and the application of the single-matrix Cs2NaBiCl6 lead-free double perovskite material in the fields of information safety, fluorescence display, X-ray detection and the like is realized.

The invention discloses a preparation method of a double-perovskite ferroelectric (FET)-antiferromagnetic (AFM) compound molecule with an oxygen bridge. In the invention, a method for compounding an FET molecule with an AFM molecule with different physical properties is described. A chemically-synthesized AFF (Antiferromagnetism-ferroelectrics) material can form an ABO3 double-perovskite compound structure with an oxygen bridge Bafm-O-Bfet. A method for compounding BaTiO3 serving as an FET typical material with NdBaMnO3 serving as an AFM typical material is taken as an example in the invention.

The present invention relates to a strontium magnesium molybdenum oxide material having perovskite structure and the method for preparing the same. Citric acid is adopted as the chelating agent. By using sol-gel pyrolysis and replacing a portion of strontium in Sr2MgMoO6-δ by cerium and a portion of magnesium by copper, a material with a chemical formula of Sr2-xCexMg1-yCuyMoO6-δ is produced, where 0≦x<2, 0<y<1, and 0<δ<6. Thereby, the electrical conductivity of the material is improved. The perovskite-type cerium- and copper-replaced strontium magnesium molybdenum oxide significantly increases the electrical conductivity of the material and can be applied as the anode material for solid oxide fuel cell (SOFC).

The invention relates to a double-perovskite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The double-perovskite catalyst providedby the invention has a chemical formula of A2BB'O6, wherein A is a rare-earth metal element La, Ce, Nd or Gd; B is Co, Fe, Ni, Cu, Mn, Zn, Al or Ga; B' is Co, Fe, Ni, Cu, Mn, Zn, Al or Ga; and B is not equal to B'. According to the invention, the double-perovskite catalyst A2BB'O6 with nano-regular morphology is prepared in an NaNO3 and KNO3 molten salt system by a molten salt method. The double-perovskite catalyst can effectively and catalytically oxidize nitric oxide into nitrogen dioxide at a relatively low temperature and in a relatively wide temperature range; and the preparation method provided by the invention has advantages of simple process, easy operation, relatively low cost and easy industrial production.

The invention discloses a method for preparing a stanniferous double-perovskite type phenol photocatalytic degradation catalyst. The catalyst is applied to carrying out a degradation reaction on low-concentration phenol sewage under the condition of simulated sunlight. According to the catalyst, a sol-gel method is used for preparation, and saccharose serves as a complexing agent. The method includes the steps that Sn powder is dissolved into a dilute nitric acid solution in a cold bath first, the obtained light yellow settled solution is then subjected to reacting and complexing with La(NO3)3-6H2O(1 / 8), Fe(NO3)3-9H2O(1 / 8) and polyethylene glycol 2000, and after roasting is conducted for 3 hours in the air atmosphere of 700 DEG C, a pure-phase double-perovskite type La2FeSnO6 photocatalyst sample is obtained. The molar ratio of selected La atoms to Fe atoms to Sn atoms is 2:1:1. The molar ratio of the saccharose to metal cations is 2:1. The method has the advantages that the sol-gel method with the saccharose used as the complexing agent is used for preparation, and the pure-phase double-perovskite type catalyst La2FeSnO6 is synthesized at a low temperature. The preparation method is simple, low in cost and free of pollution. The method has high catalytic activity and good structural stability when being used for low-concentration phenol degradation.

The invention discloses a high-conductivity double-perovskite-type anode material and a preparation method thereof and belongs to the field of solid oxide fuel cells. The high-conductivity double-perovskite-type anode material is characterized in that a B site of a double-perovskite-type (A2BB'O6) solid oxide fuel cell anode material Sr2MgMoO6 is doped with Y so that the high-conductivity double-perovskite-type anode material which is a mixed conductor having a double-perovskite structure is obtained. The preparation method provided by the invention comprises the following steps of pressing B site-doped Sr2Mg1-xYxMoO6 powder (x is in a range of 0.1 to 0.2) into a sample strip under certain pressure, carrying out sintering at a high temperature in an air atmosphere, carrying out reduction under reduction conditions, and carrying out conductivity measuring, wherein compared with a conductivity measured before doping, a conductivity measured after doping is improved 5.8 times (x=0.2). Through the preparation method provided by the invention, the high-conductivity double-perovskite-type anode material which is a porous film-type anode material Sr2Mg1-xYxMoO6 (x is in a range of 0.1 to 0.2) is obtained, and has good combinability and good chemical compatibility with electrolytes of GDC and LSGM, and carbon distribution-resistant and sulfur poisoning-resistant capabilities higher than carbon distribution-resistant and sulfur poisoning-resistant capabilites of the traditional anode material.

The invention relates to an A-site doping type double-perovskite catalyst as well as a preparation method and an application thereof, and belongs to the technical field of catalysts. The general chemical formula of the A-site doping type double-perovskite catalyst is A(2-x)A'xBB'O6, wherein A is rare earth metal La, Ce, Nd or Gd; A' is alkaline-earth metal Mg, Ca, Sr or Ba; B is transition metal Co, Fe, Ni, Cu, Mn or Mo; B' is transition metal Co, Fe, Ni, Cu, Mn or Mo, and B is different from B'. The doping type double-perovskite nanocatalyst A(2-x)A'xBB'O6 with regular morphology is preparedin a NaNO3 and KNO3 molten salt system with a molten salt process. Nitric oxide can be catalytically oxidized into nitrogen dioxide by the A-site doping type double-perovskite catalyst at lower temperature in wider temperature range.

The invention relates to a lead-free double perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells. The technical problems that an existing lead-free double perovskite material is poor in optical absorption capacity and low in photocurrent due to the fact that the optical band gap of Cs2AgBiBr6 is wide, and then the efficiency of a device is low are solved. The lead-free double perovskite solar cell sequentially comprises a transparent conductive glass cathode, an electron transport layer, a perovskite layer, a hole transport layerand a metal anode from bottom to top, the hole transport layer is a zinc-containing chlorophyll derivative Zn-Chl; and the perovskite layer is made of Cs2AgBiBr6. Zn-Chl is simultaneously used as a photosensitive material to contribute to optical absorption and photocurrent of the device. Compared with a device prepared on the basis of other non-photosensitive hole transport materials, the deviceprepared by the preparation method provided by the invention has the advantages that the photocurrent is improved by 22%-27%, the highest photoelectric conversion efficiency reaches 2.79%, and the device is a lead-free double perovskite solar cell with the highest efficiency at present.

The invention discloses an absent double-perovskite structured negative electrode material of a middle-temperature solid oxide fuel battery and a preparation method for the material and relates to a negative electrode material and a preparation method of the negative electrode material. The invention aims to solve the problem that the catalytic oxidation reduction reaction capacity of the conventional negative electrode material La(1-x)MnO3 of the solid oxide fuel battery is dramatically reduced under the middle-temperature condition. The absent double-perovskite structured negative electrode material of the middle-temperature solid oxide fuel battery is a metal-cation-absent double-perovskite powder material, and the chemical formula is Pr(1-x)Ba(1-y)Co2O5+sigma. The method comprises the steps of 1, weighing the materials according to the chemical formula, Pr(1-x)Ba(1-y)Co2O5+sigma; 2, performing grinding to obtain a mixture; and 3, performing sintering to obtain the metal-cation-absent double-perovskite powder material with the chemical formula of Pr(1-x)Ba(1-y)Co2O5+sigma. The preparation method disclosed by the invention is mainly used for preparing the absent double-perovskite structured negative electrode material of the middle-temperature solid oxide fuel battery.

The invention relates to a V-doped YBCO (Yttrium Barium Copper Oxide) superconducting thin film and a preparation method thereof, and belongs to the technical field of preparation of YBCO coating superconducting thin films. The preparation method of a double perovskite structure nanoparticle BYVO-doped YBCO superconducting thin film comprises the following steps: 1) first, preparing a precursor liquor, and mixing yttrium acetate, barium acetate and copper acetate at a molar ratio of 1:2:3 to prepare a YBCO precursor liquor; 2) uniformly stirring and then vanadium acetylacetonate, wherein the molar concentration of three metal total ions to prepare the V-doped YBCO precursor liquor; 3) coating a gel thin film; 4) sintering at low temperature; and 5) sintering at high temperature to form the nano BYVO containing YBCO superconducting thin film. The method provided by the invention is simple and accessible, and the proportion of adulterants can be arbitrarily controlled. The thin film prepared has the advantages of higher critical transformation temperature and critical current density and a good biaxial texture.

The invention relates to a method for hydrogen production by reforming of hydrogen sulfide and methane. According to the invention, hydrogen sulfide and methane are subjected to contact reaction withthe catalyst La2NiFeO6. The double-perovskite structure composite metal oxide is applied as a catalyst in the reaction of hydrogen production by reforming of hydrogen sulfide and methane. The catalysthas better high temperature thermal stability and higher activity than single oxide (like Al2O3). As the reaction is carried out at a high temperature of 800DEG C-1100DEG C, the composite oxide withthe double-perovskite structure is more suitable the reaction. In addition, the catalyst has high activity in catalyzing the reforming of hydrogen sulfide and methane for hydrogen production.

The invention relates to a B-site doped double-perovskite catalyst as well as a preparation method and application thereof and belongs to the technical field of catalysts. The B-site doped double-perovskite catalyst has a chemical formula A2B1-xMxB'O6, in the formula A is a rare-earth metal element La, Ce, Nd or Gd; B is Co, Fe, Ni, Cu, Mn, Mo, Al or Ga; B' is Co, Fe, Ni, Cu, Mn, Mo, Al or Ga; M is a transition metal Co, Fe, Ni, Cu, Mn or mo; B is not equal to B'. By using a melting salt method, the B-site doped double-perovskite catalyst A2B1-xMxB'O6 with a nano regular morphology is preparedin the melting salt system of NaNO3 and KNO3. The B-site doped double-perovskite catalyst is capable of efficiently catalyzing and oxidizing nitric oxide into nitric dioxide at a relatively low temperature within a relatively wide temperature range, and in addition, the method provided by the invention is simple in process, easy to operate, low in cost and easy in industrial production.

The invention discloses a double-perovskite-type anode material and a preparation method thereof, and belongs to the technical field of solid oxide fuel batteries. The site Mg and the site Mo of the anode material LaxSr(2-x)MgMoO6 of a double-perovskite (A2BB'O6) solid oxide fuel battery are simultaneously doped with Fe, so that a high-performance and high-stability double-perovskite structured blended conductor material is formed. The molecular formula of the double-perovskite-type anode material is LaxSr(2-x)Mg(1-y)Fe2yMo(1-y)O(6-delta), wherein x is greater than 0 and smaller than 1, y is greater than 0 and smaller than 1, and delta is greater than or equal to 0 and smaller than or equal to 1. The invention also discloses a compact-type anode material and a porous film anode material. The double-perovskite-type anode material has the technical effects that according to a charge compensation principle, the site Mg and the site Mo are simultaneously doped with Fe to achieve charge self-consistency of a material system, so that the redox stability of the material is effectively improved; cheap Fe is selected as a doping element, so that the cost of the material can be lowered; meanwhile, Fe is relatively high in valence change capacity, so that an effective conductive network can be formed on the site B, and the catalysis activity and the conductivity of the material are improved favorably.