33results about How to "Add three-phase interface" patented technology

The invention discloses a catalyst coating film, a fuel cell and a preparation method of the catalyst coating film. The catalyst coating film comprises: a proton exchange membrane; and catalytic layers formed on the two opposite sides of the proton exchange membrane, wherein the surface of each catalytic layer has a three-dimensional microstructure. Technical support can be provided for obtaininga membrane electrode and the fuel cell which give consideration to water management, mass transfer impedance reduction and catalyst utilization efficiency improvement at the same time.

The invention discloses a catalyst using a metal oxide as a carrier for fuel cells and application thereof. The catalyst is characterized in that: the metal oxide as the carrier has catalytic oxygen evolution function simultaneously, and a noble metal with catalytic oxygen reduction function is supported on the metal oxide; the nanoparticles of the noble metal are highly dispersed on the surface of the metal oxide as the carrier, wherein the mass fraction of the noble metal is 2 to 70 percent in the catalyst. The catalyst alone or the catalyst mixed with platinum black in a certain proportion is applied to bifunctional oxygen electrodes for utilized regenerative fuel cells. Compared with the traditional mechanical mixture of platinum black and an oxide from catalytic oxygen evolution reaction, the fuel cell and water electrolysis performances of the cells are greatly improved, and the performance is close to that of a commercial Pt / C catalyst in fuel cells. The catalyst is applied to fuel cell oxygen electrodes to effectively solve the problems that the activity of the catalyst is deceased by the corrosion of the carrier.

The invention discloses a method for preparing a platinum gradient-distribution catalyst layer structure of a proton exchange membrane fuel cell. The method comprises the following steps of 1, uniformly spraying a layer of a low-platinum load capacity carbon-supported platinum catalyst as a matrix on a polymer electrolyte membrane, 2, dipping the polymer electrolyte membrane with the matrix layer into a platinum precursor-containing solution so that platinum is reduced by a weak reductant and platinum nano-wires form on the matrix layer, 3, uniformly spray-coating a layer of an electrolyte resin solution on the platinum nano-wires to obtain a three-phase interface, and 4, carrying out hot-pressing with a diffusion layer to obtain a membrane electrode.

The invention discloses a catalyst coating film, a fuel cell and a preparation method of the catalyst coating film. The catalyst coating film comprises: a proton exchange membrane; and catalytic layers formed on the two opposite sides of the proton exchange membrane, wherein the surface of each catalytic layer has a three-dimensional microstructure. Technical support can be provided for obtaininga membrane electrode and the fuel cell which give consideration to water management, mass transfer impedance reduction and catalyst utilization efficiency improvement at the same time.

The invention discloses a preparation method of a self-humidifying ordered polymer membrane electrode, belonging to the technical field of membrane electrode preparation. An ordered ion exchange polymer nanotube array prepared through the method is fused together with a polymer membrane and is provided with highly ordered ion, electron and gas mass transfer channels, and electrochemical three-phase reaction interfaces are distributed in the outer surfaces of polymer nanotubes with water storage functions, so that a high-efficiency energy conversion process can be carried out in a self-humidifying manner. A catalyst in a nanoparticle or microparticle state is bonded on the surface of the ion exchange polymer nanotube array to form a catalysis layer and is relatively high in specific surface area and catalytic activity, so that the three-phase reaction interfaces of the membrane electrode are greatly added, the electrochemical polarization, the ohmic polarization and the concentration polarization of the electrode are reduced, the energy conversion efficiency is improved, and the reaction speed is increased. According to the preparation method, a membrane electrochemical reactor system is expected to be remarkably simplified, the energy conversion efficiency and the stability are improved, and the operation life is prolonged.

The invention discloses a microbial fuel cell air cathode which is composed of a diffusion layer thin film, a stainless steel net and an active layer thin film in an overlapped mode from an air side to an electrolyte side. The preparation method comprises the following steps of: mixing a carbon powder material which has good electrical conductivity and is hydrophilic and PTFE (Poly tetra fluoro ethylene) emulsion which is hydrophobic and is air conductive in ethanol; clustering through ultrasound and water bath; and finally rolling into a thin-film-shaped diffusion layer and an active layer; with the stainless steel net as an electrical conductive framework, overlapping and rolling so as to form the air cathode. The microbial fuel cell air cathode and the preparation method thereof have the following advantages: according to the preparation method, since electrical conductive carbon black is added into the air diffusion layer, the resistance of an air diffusion electrode is reduced; since the ultrasound stirring is carried out after the PTFE emulsion is dropped in, uniform and fine air holes can be formed in the electrode and the three-phase interface reduction site in the active layer is increased; and heating and curing are carried out twice in a muffle furnace, thus PTFE forms an air conveying pore canal of a three-dimensional network structure, the three-phase interface in the active layer is increased, and the microbial fuel cell air cathode is applicable to normalized mass production.

The invention relates to a preparation method of a porous nickle current collector of a lithium ion battery and relates to the field of materials of lithium ion batteries. The preparation method comprises the following steps: granulating to obtain mixed powder by adopting nickle oxide and graphite as initial materials; pressing into a green blank body and calcining to obtain a blank body; reducing the blank body to obtain a porous nickle current collector of the lithium ion battery; mixing and grinding a transition-metal-oxide negative material with a nano structure, a bonding agent and a pore forming agent, then uniformly coating the surface of the porous nickle current collector of the lithium ion battery with the mixture I, and sintering to obtain an electrode of the lithium ion battery; uniformly mixing a lithium source, an iron source, phosphate radical solution and an organic complexing agent, coating the surface of the porous nickle current collector of the lithium ion battery with the mixture II; and ageing and calcining to obtain a thin-film electrode made of lithium iron phosphate. The porous nickle current collector of the lithium ion battery has the advantages that due to good communicating characteristics, electrons can be relatively well transferred; due to a relatively high three-phase interface, electrolyte and a negative electrode can be relatively well infiltrated mutually; the thin-film electrode made of the lithium iron phosphate has the communicated three-phase interface, so that the convenience is brought for improving the electro-chemical dynamic characteristics of the material.

The invention discloses a nanofiber SSC (Sm(1-x)SrxCoO(3-delta)) cathode material as well as a preparation method thereof, a composite cathode by utilizing the cathode material as well as a preparation method thereof, and relates to a cathode material, a cathode as well as preparation methods thereof, aiming to solve the technical problem of large interfacial polarization impedance of the cathode prepared by the method. The one-dimensional nanofiber SSC cathode material is a Sm(1-x)SrxCoO(3-delta) material, which is a one-dimensional nanofiber prepared by electrostatic spinning and sintering. The composite cathode comprises an electrolytic strip, an anode or a cathode as support bodies, and the one-dimensional nanofiber SSC cathode adhered on the support bodies, wherein electrolyte nanoparticles are adhered on the SSC fiber. The preparation method of the composite cathode comprises the steps of soaking a one-dimensional nanofiber SSC cathode framework in a small amount of electrolyte precursor liquid by multiple times; and sintering to obtain the composite cathode based on the one-dimensional nanofiber SSC material. The composite cathode provided by the invention can be used in a medium-and-low-temperature solid oxide fuel battery.