32results about How to "Improve gas diffusivity" patented technology

A fuel cell capable of improving heat exchange efficiency with respect to tubular fuel cells is provided. A fuel cell includes a hollow electrolyte membrane, hollow electrodes arranged on an inside and an outside of the electrolyte membrane, respectively, and an internal charge collector arranged inside of the electrolyte membrane and the electrodes, wherein the internal charge collector is hollow and made of a nonporous member.

Provided are: an electrode catalyst layer for solid polymer fuel cells, which is capable of having high output, while being able to have improved water discharge performance and improved gas diffusibility; and a solid polymer fuel cell which is provided with this electrode catalyst layer for solid polymer fuel cells. Electrode catalyst layers (2, 3) according to one embodiment of the present invention are bonded to a polymer electrolyte membrane (1), and comprise a catalyst (13), carbon particles (14), a polymer electrolyte (15) and a fibrous material (16). The electrode catalyst layers (2, 3)have a density of from 500 mg / cm3 to 900 mg / cm3 (inclusive); or alternatively, the electrode catalyst layers (2, 3) have a density of from 400 mg / cm3 to 1,000 mg / cm3 (inclusive), and the mass of thepolymer electrolyte (15) is within the range of from 10% by mass to 200% by mass (inclusive) relative to the total mass of the carbon particles (14) and the fibrous material (16).

The present invention addresses the problem in exhaust gas purifying catalysts comprising two catalysts in which a startup catalyst and an underfloor catalyst are combined, whereby a decrease in the gas diffusibility of the underfloor catalyst causes the efficiency of using a catalytic active site to be lowered and thus the purification performance to be degraded. The present invention relates toan exhaust gas purifying catalyst comprising two catalyst in which a startup catalyst having a catalyst coat including many voids and an underfloor catalyst are combined, wherein a certain portion ormore of all the voids are composed of pores having a high aspect ratio of 5 or greater, thereby improving the purification performance of the catalyst.

The present invention provides a catalyst layer for solid polymer fuel cells, a membrane electrode assembly, and a solid polymer fuel cell that improve drainage properties and gas diffusion properties, suppress cracks in the catalyst layer, improve catalyst utilization efficiency, increases energy conversion efficiency at high output, and provide good durability. This catalyst layer for solid polymer fuel cells includes a catalyst 21, carbon particles 22, a polymer electrolyte 23, and a fibrous substance 24. The carbon particles 22 support the catalyst 21. The catalyst layer for solid polymer fuel cells has gaps 25 and the frequency of gaps 25 that have a cross-sectional area of at least 10,000 nm2 among gaps 25 observed in a cross-section in the thickness direction intersecting the surface of the catalyst layer for solid polymer fuel cells is 13%-20%.

The invention discloses a method for preparing carbon paper for a gas diffusion layer of a fuel cell with high carbon content. The preparation method comprises the following steps: immersing carbon fiber paper in a first conductive ink, ultrasonic treatment first, then negative pressure impregnation, and then drying, so that the first The solute in the conductive ink is combined with the carbon fiber paper to obtain the carbon paper precursor A; the carbon paper precursor A is carbonized to obtain the carbon paper precursor B; the carbon paper precursor B is impregnated-cured-carbonized with the second conductive ink The carbon paper precursor C is obtained, and the carbon paper precursor C and the third conductive ink are repeatedly impregnated-cured-carbonization treatment to obtain the carbon paper precursor D; the carbon paper precursor D is graphitized to obtain carbon paper. The carbon paper prepared by the invention has the mechanical strength of the gas diffusion layer, gas diffusion performance and high porosity, and has the characteristics of stable chemical performance, low resistivity and high electrical conductivity.

The invention relates to a conductive carbon felt loaded ferric ferric-doped mesoporous titanium oxide gas diffuse photoelectrode and a preparation method therefore. An efficient gas diffusion photoelectrode (TiO2-Fe)mp. / CF mesoporous loaded composite nano material is prepared by adopting a liquid crystal template method and a spray coating technology. The method has the remarkable characteristics that the conductive carbon felt loaded mesoporous (TiO2-Fe) composite nano material with a special structure and the efficient gas diffusion photoelectrode is prepared by applying the spray coating technology and the liquid crystal template method, thereby providing a novel path for application and research of a porous material loaded mesoporous doped TiO2 photocatalytic material. The conductive carbon felt loaded ferric ferric-doped mesoporous titanium oxide gas diffuse photoelectrode is simple in process and easy for industrial production. The prepared efficient gas diffusion photoelectrode mesoporous loaded composite material is good in conductivity, large in specific surface area and uniform in pore distribution.

The invention discloses a high temperature adaptable frequency converter, belonging to the field of frequency converters. A high temperature adaptable frequency converter comprises an adaptable frequency converter body. An air inlet baffle is fixedly connected to the left end of the adaptable frequency converter body, and the air intake temperature is sensed. The right inner wall of the groove is provided with a plurality of air inlet holes which are connected to the inside of the adaptable inverter body. Through the cooperation of the flexible diameter-adjusting hollow sleeve, the temperature-sensing outer sheath, the temperature-sensing heat-collecting strip and the heat-shrinkable mesh, the The air inlet hole of the adaptable inverter body is adjustable, so that it can maintain the dustproof and air intake function when the adaptable inverter body is normally dissipating heat, and can also increase the diameter by expanding the diameter when the adaptable inverter body is overheated. The air flow in the large adaptable inverter body can effectively improve the heat dissipation effect of the adaptable inverter body, and at the same time improve the adaptability of the adaptable inverter body to high temperature, it can also reduce the energy consumption of the inverter and improve its environmental protection and energy saving. nature.

A membrane electrode assembly includes an solid polymer electrolyte membrane, an anode, and a cathode. The cathode has a stacked body of a catalyst layer and a gas diffusion layer. The catalyst layer has platinum-cobalt-supporting carbon particles and an ion conductor. The ratio (P2 / P1) of the pore volume P2 (ml / g) per gram of catalyst layer in a second micro-pore diameter, ranging from 0.1 µm to less than 1 µm, over the pore volume P1 per gram of catalyst layer in a first micro-pore diameter, ranging from 0.01 µm to less than 0.1 µm, is in a range of 3.8 to 8.3.

A fuel cell electrode catalyst includes: a noble-metal-supported catalyst including a carbon support and a noble metal supported on the carbon support; and a water-repellent material with which the noble-metal-supported catalyst is modified. The carbon support is mesoporous carbon in which a pore volume of pores having a pore size of 2 nm to 5 nm is 2.1 ml / g to 2.4 ml / g. An amount of the water-repellent material is 3% by weight to 7% by weight with respect to a total weight of the mesoporous carbon and the water-repellent material.