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

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.

An improved LSCF 6428 perovskite material of the type La12zSrx+zCo0.2+aFe0.8+bO3−δ wherein x=0.4, z=(0-0.1), 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 (La0.6Sr0.4)1−zCo0.2Fe0.8O3−δ and La0.6Sr0.4Co0.2Fe0.8O3−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 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 low-temperature solid oxide fuel cell cathode in a core-shell nano fiber structure and an electrostatic spinning preparation method and belongs to the field of functional materials. The core-shell nano fiber structure cathode consists of a nano fiber core and a nano shell layer, wherein the fiber core and the shell layer respectively consist of a perovskite structure ion-electron mixed conductor component A and an oxygen ion conductor electrolyte component B or consist of opposite components; the core-shell nano fiber cathode is prepared in an electrostatic spinning manner, a component A before-spinning precursor solution and a component B before-spinning precursor solution are respectively prepared and then are respectively injected into an inner-layer spinning passage or an outer-layer spinning passage so as to carry out the spinning, and composite fibers are dried and sintered at a high temperature to obtain the core-shell nano fiber structure cathode material. By adopting the core-shell nano fiber structure, the oxygen reduction catalytic activity, anti-CO2 surface adsorption toxicity capacity and structural and performance stability of the low-temperature SOFC cathode are improved; moreover, the process is simple, and the cost is low.

The invention relates to an A-site defect type perovskite structure fuel cell electrolyte, a preparation method thereof and a fuel cell, the chemical formula of the electrolyte is Ba < 0.9 > Co < 0.4 > Fe < 0.4 > Zr < 0.1 > Y < 0.1 > O < 3-delta > (BCFZY < 0.9 >), and the electrolyte is an ABO < 3-delta > type perovskite structure material. According to the invention, the ionic conductivity and the electrolyte function are obviously improved through an A-site defect method, and good low-temperature output performance is shown in a fuel cell taking Ni0. 8Co0. 15Al0. 05LiO2-delta (NCAL) permeated foamed nickel as a symmetrical electrode. Compared with the traditional pure ion conduction type electrolyte, the electrolyte provided by the invention is an oxygen ion / proton / electron mixed conduction type semiconductor and shows good ionic conductivity in a low-temperature interval, so that the electrolyte has an important application prospect in a low-temperature solid oxide fuel cell system.

The invention provides a method for manufacturing a chip oxygen sensor. The method comprises the following steps of: adding a solvent, a plasticizing agent and a bonding agent into a substrate to obtain slurry; performing tape casting on the slurry; printing an inner electrode, an outer electrode, a protection layer, a heater and an insulating layer on the molded substrate respectively; cutting the printed substrate into single blank pieces respectively, and punching; printing conducting pins at the punched positions, and printing electrode pins on the blank pieces on one face printed with the outer electrode; connecting the conducting pins; and overlapping each single blank piece, performing heat pressing, and sintering at high temperature to form the chip oxygen sensor. Correspondingly, the invention provides a chip oxygen sensor manufactured by adopting the method. The chip oxygen sensor and the manufacturing method thereof have the advantages of simple process flow, high yield, fast response time, short activating time, high airtightness and the like.

A production method for producing a fuel cell, includes spinning a precursor consisting of a salt of at least one metal chosen from Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Ho, Yb, Sr, Ba, Mn, Co, Mg, and Ga, a solvent, and a macromolecular polymer to produce nanofibers of the precursor containing the salt of the metal. The method further includes calcining the nanofibers of the precursor at a temperature ranging from 550° C. to 650° C. for 2 to 4 hours, and making a solid electrolyte material composed of the nanofibers obtained from the calcining. The resulting solid electrolyte material constitutes a part of a fuel cell.

The invention provides a preparation method of a nano electrolyte material for a mesothermal solid oxide fuel cell, and relates to a preparation method of a nano electrolyte material for a solid oxide fuel cell. By the invention, the problems that the ionic conductivity of a mesothermal region of the conventional electrolyte material for the mesothermal solid oxide fuel cell is low and the preparation temperature of the conventional oxyen ion conductor electrolyte material is higher can be solved. The method comprises steps, including: weighing CeO2, rare-earth element nitrate and cobalt nitrate, grinding and mixing uniformly, adding mixed inorganic alkali, heating, washing and drying. Within the temperature of 500 to 700 DEG C, the ionic conductivity is high and reaches 0.047Scm<-1> at most; due to doping of Co3<+>, the conduction performance of the electrolyte material is enhanced and the ionic conductivity is increased, and the electrochemical performance of the CeO2 electrolyte doped with the single rare-earth Nd3<+> ion is improved.

The invention provides a high-temperature carbonized ceramic-based molecular sieve membrane oxygen generator and a method for using the same, which include sequentially connected air source inlets, an air compressor, a C-level filter, an air storage tank, and 3-5 high-temperature carbonized ceramic-based molecular sieve membranes. Molecular sieve adsorption unit, vacuum pump, oxygen gas storage tank, nitrogen gas storage tank, the end of the oxygen gas storage tank is provided with a first check valve, and the end of the nitrogen gas storage tank is provided with a second check valve; the vacuum pump is set on a high-temperature carbonized ceramic-based molecular sieve In the adsorption unit, the high-temperature carbonized ceramic-based molecular sieve adsorption unit communicates with the oxygen storage tank through an oxygen distribution pipeline, and the high-temperature carbonized ceramic-based molecular sieve adsorption unit communicates with the nitrogen gas storage tank through a nitrogen distribution pipeline. The oxygen generating device provided by the present invention has the molecular sieve of the adsorption tower of oxygen ion conductive carbonized ceramic-based molecular sieve membrane with good recycling rate, and absorbs and desorbs oxygen ions under high temperature and vacuum to efficiently separate oxygen and nitrogen to improve the purity of oxygen production.