57 results about "Cobaltite" patented technology

A solid mixture of La2NiO4+δ and an ionic conductive material. A solid oxide fuel cell having a cathode interlayer having a La2NiO4+δ layer and a doped ceria layer, a lanthanum strontium cobaltite or lanthanum strontium manganate cathode current collector, an anode; and an ionic conductive electrolyte between and in contact with the cathode interlayer and the anode.

Disclosed is a cathode active material and a method to produce the same at low cost. The cathode powder comprises modified LiCoO2, and possibly a second phase which is LiM′O2 where M′ is Mn, Ni, Co with a stoichiometric ratio Ni:Mn≧1. The modified LiCoO2 is Ni and Mn bearing and has regions of low and high manganese content, where regions with high manganese content are located in islands on the surface. The cathode material has high cycling stability, a very high rate performance and good high temperature storage properties.

Grain oriented ceramics constituted of a polycrystalline body of a layered cobaltite in which a {001}plane of each grain constituting the polycrystalline body has an average orientation degree of 50% or more by the Lotgering's method. In this case, the layered cobaltite is preferably a layered calcium cobaltite expressed by the following general formula: {(Ca1-xAx)2CoO3+alpha} (CoO2+beta)y (where A represents one or more elements selected among an alkali metal, an alkaline earth metal and Bi, 0 <=x<=0.3, 0.5 <=y <=2.0, and 0.85 <={3+alpha+(2+beta)y} / (3+2y) <=1.15). Such grain oriented ceramics are obtained by molding a mixture of the first powder constituted of a Co(OH)2 platelike powder and the second powder constituted of CaCO3 and the like such that a developed plane of the platelike powder is oriented, and by heating the green body at a predetermined temperature.

Rapid, reversible redox activity may be accomplished at significantly reduced temperatures, as low as about 200° C., from epitaxially stabilized, oxygen vacancy ordered SrCoO2.5 and thermodynamically unfavorable perovskite SrCoO3-δ. The fast, low temperature redox activity in SrCoO3-δ may be attributed to a small Gibbs free energy difference between the two topotactic phases. Epitaxially stabilized thin films of strontium cobaltite provide a catalyst adapted to rapidly transition between oxidation states at substantially low temperatures. Methods of transitioning a strontium cobaltite catalyst from a first oxidation state to a second oxidation state are described.

The invention belongs to the technology field of oxide thermoelectric materials of the functional materials and the preparation thereof, and relates in particular to thermoelectric materials of acetate doping with co-o-Na. The invention utilizes sol-gal method, takes the acetate as the raw material and the citric acid as the complexing agent. The sol is formed at the temperature of 353 K to 363K and the xerogel is formed at the temperature of 323 K to 393K. The precursor nano meter powder can be obtained by gel pyrolysis and roasting; and the bulk material can be got by sintering finally. The invention utilizes the common water metal acetate as the raw material and the whole preparation process does not produce poisonous and harmful gas. The synthesis technology is simple and safe; furthermore, the drying process adopts decompression drying and realizes the drying process with low temperature and short time; also, the precursor powder has good uniformity and obvious layered structure, which is helpful to producing the bulk thermoelectric materials with high crystal orientation and high performance.

A device includes at least one ultra-small resonant structure; and shielding constructed and adapted to shield at least a portion of said ultra-small resonant structure with a high-permeability magnetic material. The magnetic material is formed from a substance selected from a non-conductive magnetic oxide such as a ferrite; a cobaltite, a chromite, and a manganite. The magnetic material may be mumetal, permalloy, Hipernom, HyMu-80, supermalloy, supermumetal, nilomag, sanbold, Mo-Permalloy, Ultraperm, or M-1040.

An electric power generation cell 1 is constituted by arranging a fuel electrode layer 4 on one side of a solid electrolyte layer 3 and an air electrode layer 2 on the other side of the solid electrolyte layer 3. The solid electrolyte layer 3 is constituted of an oxide ion conductor mainly composed of a lanthanum gallate based oxide. The fuel electrode layer 4 is constituted of a porous sintered compact having a highly dispersed network structure in which a skeletal structure formed of a consecutive array of metal grains is surrounded by mixed conductive oxide grains. For the air electrode layer 2, a porous sintered compact mainly composed of cobaltite is used. This configuration reduces the overpotentials of the respective electrodes and the IR loss of the solid electrolyte layer 3, and accordingly can actualize a solid oxide type fuel cell excellent in electric power generation efficiency.

A thermoelectric transducing material according to this invention includes a layered cobaltite based substance represented by the chemical formula AxCoO2, wherein A consists of an element or element group selected from alkali metal elements and alkali earth group elements and is compositionally modulated in a thickness-wise direction of layers in a structure of the layered cobaltite based substance.

The invention relates to a lithium sodium cobalt oxygen thermoelectric ceramic and a preparation method thereof. The general formula of the cobaltate thermoelectric porcelain is LixNayCoO2, in which the contents of lithium and sodium are respectively 0.375≤x≤0.48 and 0.3≤y≤0.45; the raw materials with a molar ratio of Li2CO3:Na2CO3:Co3O4 of 3x:3y:2 are fully mixed , ground, and then punched under a pressure of 80-120 MPa to obtain compressed tablets, wherein, 0.375≤x≤0.48, 0.3≤y≤0.45; the compressed tablets were calcined in a tube furnace with flowing oxygen for 24-48 hours, calcined The temperature is 1103-1173K, and then rapidly cooled to room temperature to obtain a single-phase polycrystalline block. The invention shows that lithium sodium cobalt oxide can be used as a novel thermoelectric material. The preparation of the material is realized by changing the composition of the initial reactant, the sintering atmosphere, the sintering temperature, the sintering time and the method of rapid cooling. The material has a large thermoelectric coefficient (170-210 μV / K) near room temperature, and its quality factor is higher than that of similar cobaltate thermoelectric ceramics, so it has application prospects.

Provided is a method of making a composite ceramic material for a fuel cell. The composite ceramic material for the fuel cell forms a cored structure where perovskite ceramic particles having a small particle diameter surround lanthanum cobaltite particles having a large particle diameter. Lanthanum cobaltite is added as a starting material in a process of synthesizing the perovskite ceramic particles. The composite ceramic material for the fuel cell made according to this method improves an electric connection characteristic between a separation plate and a polar plate of the fuel cell, and is chemically and mechanically stable.

The invention provides a preparation method of a ternary composite room temperature gas-sensitive material with Au (gold) nanoparticle-loaded porous flaky ZnCo2O4 (zinc cobaltite) vertically growing on rGO (reduced graphene oxide). The preparation method specifically comprises the following steps of using GO (graphene oxide), zinc nitrate hexahydrate and cobalt nitrate hexahydrate as raw materials, using hexamethylenetetramine as an original precipitator, using trisodium citrate as a surfactant and a reducing agent, and performing water bath heating and calcining treatment, so as to obtain the porous flaky ZnCo2O4 which vertically grows on the rGO carrier; using the chloroauric acid as the raw material, loading noble metal Au nanoparticle onto the surface, and finally obtaining the ternary composite gas-sensitive material with Au nanoparticle-loaded porous flaky ZnCo2O4 vertically growing on the rGO carrier. The preparation method has the advantages that the production technology is simple; the porous flaky ZnCo2O4 which vertically grows on the rGO is prepared, and the noble metal Au nanoparticle is loaded, so as to obtain the gas-sensitive detection material with sensitive property on the NO2 (nitrogen dioxide) gas at room temperature.

The invention discloses a method of preparing nickel cobaltite / carbon nanotube composite materials. The invention further relates to a method of preparing a carbon nanotube loaded with nano-particles nickel cobaltite. The method comprises the following steps of dissolving Ni(NO3)2.6H2O and Co(NO3)2.6H2O in diglycol to prepare a mixed metal solution A containing Ni2+ / Co2+ with a mol ratio being 1:2; dissolving NaOH and a carbon nanotube in the diglycol and performing ultrasonic dispersion to form a solution B; making the solution B added in the solution A drop by drop to acquire a mixed solution; fully and uniformly stirring the mixed solution in a condition with a temperature of 80 DEG C, moving the solution to a reaction vessel and further replacing CO2, and after the replacement, adjusting the pressure intensity of the CO2 to be 10MPa; putting the reaction vessel in an oil bath pan, setting the stirring rate to be 400r / min, the temperature to be 140-220 DEG C, and the reaction time to be 4-10h; cleaning the acquired product by ethanol and distilled water to be neutral and further performing centrifugation and 80 DEC C drying to acquire nickel cobaltite / carbon nanotube composite materials. The method which hardly damages the structure of the carbon nanotube has the characteristics of simple operation and environment friendliness. By means of the method, products can be directly acquired in the solution without calcining. The acquired nickel cobaltite / carbon nanotube composite materials have relatively high specific capacitance and good electrochemistry performance stability when applied to super capacitor electrodes.