47results about How to "High oxygen ion conductivity" patented technology

An improved LSCF 6428 perovskite material of the type La_12zSr_x+zCo_0.2+aFe_0.8+bO_3−δ wherein x=0.4, z=(0.01−0.1), a=(0.01−0.04), and b=(0.05−0.15) for use as an SOFC cathode having increased electronic and ionic conductivity. The general formula is similar to the prior art formulae (La_0.6Sr_0.4)_1−z Co_0.2 Fe_0.8O_3−δ and La_0.6Sr_0.4 Co_0.2 Fe_0.8O_3−δ but applies the z term to La and Sr independently as well as reducing the overall content of La. Further, by adding a small amount (a) of extra Co ions, catalytic activity, conductivity, and sinterability are further enhanced. Adding small amounts (b) of Fe and/or Fe and Co moderates the thermal expansion coefficient with no adverse effect on crystal structure or fuel cell performance. Improved sinterability, microstructure, and reduced film cracking result in high power density of fuel cells. An inherently low-cost solid state reaction method is described.

A disclosed high-stability high-permeability compact ceramic oxygen-permeation membrane is composed of, in percentage by volume, 75-92% of an oxygen ion conductor phase and 8-25% of an ion-electron conductor phase; the oxygen ion conductor phase is a doped CeO2 porous matrix, and the ion-electron mixed conductor phase is a perovskite structure oxygen ion-electron mixed conductor and is disposed in a connected pore channel of the matrix. Additionally, the invention also discloses a preparation method for the above high-stability high-permeability compact ceramic oxygen-permeation membrane. The technical scheme effectively solves the problem that a ceramic oxygen-permeation membrane cannot simultaneously possess the long-term stability and the high oxygen permeation flux in the prior art. The oxygen permeation flux is improved, and also the high-stability high-permeability compact ceramic oxygen-permeation membrane has good long-term working stability.

A single cell for a solid oxide fuel cell and a solid oxide fuel cell using the same practicable and excellent in generation performance and durability, wherein a fuel electrode including a cermet of a catalyst and a second solid electrolyte with oxide ion conductivity at 1000° C. of 0.20 S/cm or more is bonded to one side of a solid electrolyte plate with the conductivity of 0.07 S/cm or more and bending strength of 700 MPa or more, and an air electrode including a compound of perovskite type transition metal oxide with a third solid electrolyte is bonded to the other side. A surface of the fuel electrode is coated with a layer, and an air electrode surface is coated with a layer, and an aqueous solution where a noble metal compound is dissolved in water is impregnated into the air electrode.

A solid oxide fuel cell (SOFC) contains a first solid electrolyte layer of LaGa-based perovskite, an air electrode, a fuel electrode and a second solid electrolyte layer (having a hole transport number smaller than that of the first solid electrolyte layer), which is provided between the first solid electrolyte layer and an air electrode. Also, another SOFC contains a first solid electrolyte layer of LaGa-based perovskite, an air electrode, a fuel electrode and a third solid electrolyte layer (having electron and proton conductivity lower than that of the first solid electrolyte layer), which is provided between the first solid electrolyte layer and the fuel electrode. Still another SOFC contains the second solid electrolyte layer provided between a first solid electrolyte layer and an air electrode and the third solid electrolyte layer provided between the first solid electrolyte layer and a fuel electrode.

An oxygen ion conducting ceramic oxide that has applications in industry including fuel cells, oxygen pumps, oxygen sensors, and separation membranes. The material is based on the idea that substituting a dopant into the host perovskite lattice of (La,Sr)MnO₃ that prefers a coordination number lower than 6 will induce oxygen ion vacancies to form in the lattice. Because the oxygen ion conductivity of (La,Sr)MnO₃ is low over a very large temperature range, the material exhibits a high overpotential when used. The inclusion of oxygen vacancies into the lattice by doping the material has been found to maintain the desirable properties of (La,Sr)MnO₃, while significantly decreasing the experimentally observed overpotential.

The invention discloses an oxide fuel cell based on a lanthanum nickelate and lanthanum-doped yttrium oxide composite material. A cathode and an anode of the fuel cell are made from foam nickel coatedwith NCAL on the surface, and an electrolyte layer of the fuel cell is a SNO/NSDC composite material, that is, the structure of the fuel cell is made from foam nickel//NCAL//SNO/NSDC//NCAL//foam nickel. The low-temperature solid oxide fuel cell uses the lanthanum-doped yttrium oxide (NSDC) composite material, prepared by utilizing a sodium carbonate precipitation process, of an ionic conductor asan electrolyte layer, and greatly reduces the electrode polarization loss during the electrochemical reaction of the fuel cell; in addition, the electrolyte material has good output power in the lowtemperature section, so that the solid oxide fuel cell using the electrolyte material can be efficiently and stably operate in a low temperature range (300-600 DEG C) for a long period of time. Stableoperation.

The invention relates to an electrolyte material with a perovskite structure, and belongs to the technical field of fuel cells. The electrolyte material is a novel electrolyte material LSGML (La1-aSraGa1-b-cMgbLicO3-delta, wherein a ranges from 0.01 to 0.2, b ranges from 0.01 to 0.25, and c ranges from 0.01 to 0.2) formed by partly replacing a conventional LSGM (La1-aSraGa1-bMgbO3-delta) electrolyte material by lithium elements. The electrolyte material has higher oxygen vacancy concentration and lower oxygen ion migration energy compared with the current LSGM, then has an electrical conductivity better than that of the LSGM at the same temperature, and is relatively suitable for being used as electrolyte of solid oxide fuel cells and solid oxide electrolytic cells.

The invention relates to a high-temperature fused salt battery which comprises a positive pole, pasty dual electrolyte and a negative pole, wherein the positive pole is exposed in air, the pasty dualelectrolyte is prepared from fused salt and solid electrolyte powder by mixing, the fused salt is potassium carbonate and/or sodium carbonate, the solid electrolyte powder is zirconium oxide micron powder containing yttrium oxide, and the negative pole is separated from the positive pole by the pasty dual electrolyte. The high-temperature fused salt battery disclosed by the invention is a high-temperature fused salt battery which can be applied to large-scale power grid energy storage and is based on the fused salt and the solid electrolyte powder material. The pasty dual electrolyte disclosedby the invention can be easily prepared from the fused salt and the solid electrolyte powder through direct mixing, so that the pasty dual electrolyte has the advantages of higher oxygen ion conductivity, lower fluidity and good filling ability; furthermore, the short circuit and open circuit phenomena between the positive pole and the negative pole of the battery are effectively avoided, circular charge-discharge property of the battery is remarkably improved, and the processing manufacturing cost of the high-temperature fused salt battery is obviously reduced.

A solid oxide fuel cell which has high output capacity especially at an operating temperature of 600° C.-800° C. and effectively prevents influence of reaction between respective layers. The solid oxide fuel cell includes a solid electrolyte layer between a fuel electrode and an air electrode, a support comprised of either the fuel electrode or the air electrode, and at least first and second layers provided in turn from the side of the support. The first layer is comprised of a cerium-containing oxide and the second layer is comprised of a lanthanum-gallate oxide containing at least lanthanum and gallate. A sintering assistant for improving sintering property of the cerium-containing oxide is contained in the first layer. When the thickness of the second layer is T μm, the value of T is 2<T<70.

A process for nano crystal oxidize bismuth base oxygen ion solid electrolyte working in middle or low temperature by chemical liquid phase law and basic technics of ceramic material include reverse chemical coprecipitation method of titration and frit technics, use nano Bi2O3+Y2O3mixed power as material. The conductance rate of solid electrolyte is more than 10 to the power -6 omega to the power -1 . cm-1 in the condition of beyond 300deg.C, so it is used for gas sensor, also for fuel cell and penetrating oxygen material working in the 500deg.C or below.

The invention relates to a preparation method of an electrolyte material for a medium-temperature solid fuel cell, and belongs to the technical field of new energy sources. Based on the characteristics of higher oxygen ion conductivity of the cerium-oxide-doped electrolyte at a relatively low temperature as well as better chemical compatibility and mechanical matching property with a high-performance cathode material at sintering and working temperatures, the electrolyte material of the cell is formed by doping rare earth elements such as cerium, gadolinium and the like, the oxygen vacancy concentration of the cell is greatly increased, and accordingly, the ion conductivity of the cell is improved; the crystal size of the material is reduced at a lower synthesis temperature, and the sintering performance and the sintering density of the material are improved, so that the oxygen ion conduction of the electrolyte is ensured; the average crystal size of the electrolyte is reduced by compounding titanium dioxide and strontium oxide, particles of the electrolyte are homogenized, the whole electrolyte can be more densified, the ionic conductivity is improved, and the output power of thesingle cell supported by the electrolyte is further improved.

Provided is a solid electrolyte material provided which, while maintaining a high oxygen ion conductivity, minimizes the extraction of scandia caused by impurities such as silicon in the fuel gas, and has improved intergranular strength in order to eliminate intergranular fracture caused by crystalline modification. The solid electrolyte material is a zirconia solid electrolyte material having yttria dissolved therein, has cubic crystals as the main ingredient, and is further characterized by having a lanthanoid oxide dissolved therein.

The invention belongs to the technical field of preparing a solid oxide oxygen ion conductor and in particular relates to a laser preparation method of a lanthanum molybdate based oxygen ion conductor. The preparation method comprises the following steps of: adopting La2O3, MoO3 and WO3 powder as the raw materials; proportioning according to the mole ratio of La2Mo(2-x)WxO9 with the value of x between 0.2 and 1.2; and mixing evenly and compacting the raw materials to obtain blanks, presintering and subjecting the blanks to irradiation of CO2 laser beams for full reaction. The preparation method provided by the invention is simple in process, low in cost, short in time consumption, low in energy consumption and good in process repeatability and the obtained sample of the lanthanum molybdate based oxygen ion conductor has high density and high oxygen ion conductivity.

The invention includes following structures and steps: using YSZ and RCO ceramics target as well as using monocrystalline silicon MgO and Ni-YSZ or Ni-RCO anode plate as substrate, distance between target and substrate as 30-80mm; vacuum degree 1X10-4-1X10-5 Pa, substrate temperature 300 deg.C-800 deg.C; ratio of gas pressure between oxygen and argon as 5%-40%; Thickness of each film is 10-200 nano, and number of layer is larger than or equal to three, the invention also contains other technical parameters. Multiple layers of nano film provides advantages of raising conductivity of oxyanion 10%-50%, optimizing fuel cell performance. The disclosed sputtering technique has features of fast, and high quality.

A solid oxide fuel cell provided with a power cell (1) in which a fuel electrode layer (4) is arranged on one surface of a solid electrolyte layer (3) and an air electrode layer (2) is arranged on the other surface thereof, wherein the solid electrolyte layer (3) has a two layer structure including a first electrolyte layer (3a) made of a ceria based oxide material and a second electrolyte layer (3b) made of a lanthanum gallate based oxide material, and the second electrolyte layer is formed on the side of the air electrode layer. It is preferable that the first electrolyte layer is formed thinner than the second electrolyte layer. According to such a configuration, there can be provided a solid oxide fuel cell comprising an inexpensive solid electrolyte layer which reduces the contact resistances in the interfaces between the solid electrolyte layer and the respective electrode layers, and thereby improves the generation efficiency. Additionally, by adopting a configuration in which the composition ratio of component materials in the fuel electrode layer (4) is graded along the thickness thereof, there can be provided a solid oxide fuel cell in which the generation characteristics of the power cell are improved and the durability of the solid oxide fuel cell is improved. Preferably, the material composition for the fuel electrode layer (4) is a mixture of Ni and CeSmO₂, wherein the composition ratio of component materials is graded along the thickness thereof in such a way that the quantity of Ni is made less than the quantity of CeSmO₂ near the boundary interface with said solid electrolyte layer, and the mixing ratio of Ni is gradually increased with an increasing distance away from the interface.

The invention relates to a preparation method of an oxygen permeable membrane, belonging to the technical field of new materials. The invention utilizes better oxygen ion conductivity and chemical stability at high temperature of zirconia solid electrolyte with stable yttrium oxide. As that cubic perovskite structure has relatively open space inside, a larger channel is provided for oxygen ion conduction in the cubic perovskite structure, and therefore, the prepared oxygen permeable membrane has high oxygen ion conductivity; the present invention adopts phase inversion-sintering technology, aspinning solution is extruded into a wet film by a spinneret, as that wet membrane is immersed in a non-solvent, the thermodynamic state of the wet film is changed, so as to generate phase splitting to form a solid film, so as to prepare the oxygen permeable membrane with high oxygen permeability, and during the phase inversion process, because of rapid diffusion between solvent and non-solvent, afinger pore structure is formed on the inner and outer surfaces of the hollow fiber membranes and a sponge pore structure is formed on the middle layer, the sandwich structure reduces the actual working thickness of the membranes and greatly improves the oxygen permeation performance.

The invention provides an oxygen production device of a medical-grade high-temperature molecular sieve membrane adsorption tower and a use method of the oxygen production device. The oxygen production device comprises a gas source access port, an air compressor, a C-grade filter, an air storage tank, a T-grade filter, an A-grade filter, an H-grade filter, 2-4 high-temperature carbonized ceramic-based molecular sieve adsorption units, a vacuum pump, an oxygen storage tank and a nitrogen storage tank which are communicated in sequence, the vacuum pump is arranged in the high-temperature carbonized ceramic-based molecular sieve adsorption unit, the high-temperature carbonized ceramic-based molecular sieve adsorption unit is communicated with the oxygen storage tank through an oxygen diversion pipeline, and the high-temperature carbonized ceramic-based molecular sieve adsorption unit is communicated with the nitrogen storage tank through a nitrogen diversion pipeline. The oxygen production device provided by the invention is provided with the molecular sieve of the adsorption tower of the oxygen ion conductive carbonized ceramic-based molecular sieve membrane with good cyclic utilization rate, and oxygen ions are adsorbed and desorbed under high-temperature vacuum, so that oxygen and nitrogen are efficiently separated, and the oxygen production purity is improved.

The present invention provides a membrane, comprising in said order a first electronically conducting layer, an ionically conducting layer, and a second electronically conducting layer,

characterized in that the first and second electronically conducting layers are internally short circuited.

The present invention further provides a method of producing the above membrane, comprising the steps of:

• • providing a ionically conducting layer;
  • applying at least one layer of electronically conducting material on each side of said ionically conducting layer;
  • sintering the multilayer structure; and
  • impregnating the electronically conducting layers with a catalyst material or catalyst precursor material.

The invention discloses an oxide fuel cell based on a neodymium nickelate and samarium-calcium co-doped cerium oxide composite material. A cathode and an anode of the fuel cell are foamed nickel withNCAL coated on the surfaces, and an electrolyte layer of the fuel cell is an NNO/SCDC composite material. The structure of the fuel cell is foamed nickel//NCAL/NNO/SCDC//NCAL/foamed nickel. Neodymiumnickelate which is of a perovskite structure and a samarium-calcium co-doped cerium oxide composite material are used as the electrolyte layer, so that the electrode polarization loss in the electrochemical reaction process of the fuel cell is greatly reduced; In addition, the electrolyte material has good output power in a low-temperature section, so that the solid oxide fuel cell adopting the electrolyte material can efficiently and stably operate for a long time in the low-temperature section (400-600 DEG C).