48results about How to "Increase the three-phase reaction interface" patented technology

The preparation method for electrode and membrane electrode of proton exchange membrane fuel cell comprises: when preparing the catalysis layer with thickness in 3-100 mum, adding pore-forming agent, and adjusting the rate between alcohol and water in dispersing agent to change the recrystallized pore-forming agent size for adjusting electrode hole size and porosity in 30-75%. This invention can improve gas mass transfer and cell performance, and has wide application.

The invention relates to a nano carbon-doped porous fiber single electrode, a membrane electrode and a preparation method. According to the nano carbon-doped porous fiber single electrode, a semi-ordered porous nano fiber thin film is deposited at one side of a gas diffusion layer material; and a layer of metal nanoparticles with catalytic activity is evenly deposited on the nanofiber surface of the semi-ordered porous nano fiber thin film to form the nano carbon-doped porous fiber single electrode, wherein the semi-ordered porous nano fiber thin film is formed by a co-spun high-molecular polymer nano charged superfine fiber attached with a nano carbon material on the surface, and comprises a co-spun high-molecular polymer doped with the nano carbon material as the component. According to the nano carbon-doped porous fiber single electrode, the semi-ordered porous nano fiber layer is formed by the nano carbon material and a high-molecular polymer solution through electrostatic spinning and cospinning for the first time; a catalyst is sprayed on the porous nano fiber layer; and a mico-pore layer and a catalyst layer are combined into one, so that the properties of a prepared single battery are greatly improved; and the lifetime is greatly prolonged.

The invention discloses an efficient electrochemical reactor of electro-catalysis in-situ hydrogen peroxide. The reactor consists of a two-cavity reaction system and an external circuit. A solid polymer electrolyte membrane is arranged in the middle of the two-cavity reaction system and can separate a cathode reaction and an anode reaction. The two-cavity reaction system mainly comprises a cathode end plate, a cathode gas diffusion electrode, a cathode chamber, an ion exchange membrane, an anode chamber, an anode gas diffusion electrode and an anode end place from left to right. The external circuit consists of an ammeter, a voltmeter and a variable resistor. The reactor effectively improves a three-phase reaction interface and a reaction rate by utilizing the gas diffusion electrodes loaded with a catalyst. Electrolyte in the cathode and anode chambers for participating in the reaction can rapidly diffuse a reaction product in a solution, so that the reaction products are enriched and the concentration of the reaction product is improved. A current and the reaction speed can be adjusted by adjusting the variable resistor. The electrolyte at a cathode and at an anode can circulate under the action of a circulating pump to maintain a higher conductivity of the system and the high reaction rate of the electrode reaction.

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 relates to the field of fuel cells, and particularly discloses catalyst slurry for a fuel cell, a preparation method of the catalyst slurry and a membrane electrode. The preparation method of the catalyst slurry for the fuel cell comprises the following steps of S1) carrying out ultrasonic dispersion treatment on a perfluorosulfonic acid solution at 50-90 DEG C to obtain a perfluorosulfonic acid dispersion liquid; and S2) mixing the perfluorosulfonic acid dispersion liquid with a catalyst, a dispersing agent and deionized water, and emulsifying and dispersing to obtain the fuel cell catalyst slurry. By utilizing the preparation method, the problem of uneven dispersion of the proton conduction ionomer in the existing catalyst slurry can be solved, and the preparation method isused for improving the dispersity of the proton conduction ionomer in the catalyst slurry.

The invention relates to a preparation method for an anode support layer of an anode support type solid oxide fuel cell. According to the invention, the anode is in gradient design and divided into a functional layer and a support layer; the anode functional layer and an electrolyte layer both with about 20 microns in thickness are made through a tape casting method; in order to ensure the battery strength, a superfine A12O3 with less than 200nm particle diameter is made, and a Nio, a sintering assistant MgO and a needle-shaped A12O3 are added at the same time, so as to form an anode support layer powder body which is compressed together with the functional layer and the electrolyte layer, thereby obtaining an anode support type/film layer electrolyte composite material half cell. The method has a simple process and a low cost, and is suitable for industrialized production, and accordingly the mono-cell made through the method has high strength and favorable electrochemical property.

A preparation method for a solid oxide fuel cell cathode relates to a preparation method for a fuel cell cathode, which resolves problem in prior art that catalytic activity of a solid oxide fuel cell cathode is low under middle and low temperature. The preparation method includes: preparing sol from La1-xSrx(NO3)3M(NO3)2 and citric acid solution, filling the sol into a hole of an anode aluminum oxide template, calcining under high temperature, dipping into NaOH solution, and obtaining the solid oxide fuel cell cathode. Catalytic activity of the solid oxide fuel cell cathode of present invention is high under middle and low temperature.

The invention provides a fuel cell proton exchange membrane with a micro texture and a processing method of the fuel cell proton exchange membrane. A plurality of petal-shaped concave-convex compositetextures are distributed on the surface of a cathode of the fuel cell proton exchange membrane in a gradient manner that the inside is dense and the outside is sparse. The concave-convex composite texture comprises pits and protrusions, a circle of protrusions are arranged on the edges of the pits, and a plurality of semi-ellipsoid micro pits are evenly distributed in the inner surfaces of the pits. The surface of the cathode is divided into a central area, a middle area and a peripheral area according to the distance between every two adjacent concave-convex composite textures, and in each area, the distance between every two adjacent concave-convex composite textures is gradually increased from inside to outside in a gradient mode. The concave-convex composite texture can effectively increase the surface area of the cathode surface of the proton exchange membrane, facilitates full contact between the catalyst and reaction gas, and improves the reaction efficiency; and the carbon-supported platinum catalyst can be stably embedded in the structure, and the active area of the catalyst is increased, so that the utilization rate of the catalyst is increased.

The present invention relates to an ordered mesopore catalyst layer and a preparation method thereof, application of an ordered mesopore catalyst layer, and a film electrode and a preparation method thereof. The preparation method of the ordered mesopore catalyst layer comprises the steps of: mixing a resin precursor, a soft template, a precious metal precursor and a solvent to obtain a mixed solution, performing film formation, evaporating the solvent, performing heat treatment and carbonization treatment of the mixed solution to obtain an ordered mesopore catalyst layer. When Pt is selectedas the precious metal, the film electrode prepared by employing the ordered mesopore catalyst layer has the highest power density up to 0.7W/cm2 when having the current density being 1.0A/cm2, and hasthe highest power density up to 1.21W/cm2 when having the current density being 2.0A/cm2.

The invention provides an anode/electrolyte half-cell, an anode-supported solid oxide fuel cell and a manufacturing method thereof. The manufacturing method of the anode/electrolyte half-cell comprises the following steps: producing a NiO-YSZ anode support body casting sheet; carrying out micromachining treatment on the surface of one side of the NiO-YSZ anode support body casting sheet to form a special orthogonal net-shaped structure on the surface of the NiO-YSZ anode support body casting sheet; pre-sintering the treated NiO-YSZ anode support body casting sheet; coating a nano powder slurry on the surface of the pre-sintered anode support body, and drying to form an anode functional layer; and coating the YSZ electrolyte layer on the anode functional layer and then sintering at a high temperature. The anode-supported solid oxide fuel cell comprises an anode/electrolyte half cell and an LSM-YSZ composite cathode layer coated on the surface of a YSZ electrolyte layer of the anode/electrolyte half-cell. The anode-supported solid oxide fuel cell has excellent structural stability, activity and electrochemical performance.

The invention discloses an integrated composite oxygen electrode, and a preparation method and application thereof. The preparation method comprises the following steps: dissolving polyoxyethylene in acetonitrile, and adding lithium salt and inorganic electrolyte to prepare uniform electrolyte membrane slurry; dissolving polyoxyethylene in N-methyl pyrrolidone, and adding lithium salt and inorganic electrolyte to prepare composite binder slurry; grinding the composite binder slurry and a catalyst, uniformly coating a current collector with the composite binder slurry and the catalyst, and drying to obtain a composite oxygen electrode; and pouring the electrolyte membrane slurry on the composite oxygen electrode, slicking and drying to obtain the integrated composite oxygen electrode. According to the integrated oxygen electrode, the composite electrolyte material with the ion conducting characteristic is used for replacing an inert binder, a lithium ion continuous transmission channel from the oxygen electrode to the electrolyte is constructed, low oxygen electrode/electrolyte interface impedance is achieved, a three-phase reaction interface in the oxygen electrode is expanded, and the charge-discharge cycle performance of the solid-state lithium-oxygen battery is improved.

The invention relates to a method for preparing a NiO/apatite type lanthanum silicate submicron-nano porous anode functional layer. The method comprises the following steps of: adding functional layer nano powder, ethyl cellulose and terpilenol into a rotary evaporation bottle filled with absolute ethyl alcohol, and carrying out ultrasonic dispersion on the mixed suspension; removing absolute ethyl alcohol in the turbid liquid by adopting a rotary evaporator, and when the turbid liquid becomes thick paste, taking out the paste and grinding to finish the preparation of the functional layer slurry; and brushing the functional layer slurry on an anode base body for three layers, carrying out corresponding heat treatment and sintering after drying the functional layer slurry, controlling the heating and cooling rate and the heat preservation time in the heating process, and manufacturing the anode functional layer. The method has the advantages that the maximum aperture of the prepared NiO/apatite type lanthanum silicate submicron-nano porous anode functional layer is smaller than 1 micron, the surface is smooth and free of cracks, and a substrate is provided for preparing a compact electrolyte film with the thickness of several microns on the NiO/apatite type lanthanum silicate submicron-nano porous anode functional layer through magnetron sputtering; and the functional layer contains a large number of nano pores, so that the three-phase interface is greatly increased.

The invention discloses a carbon-resistant and sulfur poisoning-resistant solid-state oxide fuel cell positive electrode and a preparation method thereof. Copper and samarium co-doped cerium oxide orcopper gadolinium co-doped cerium oxide powder is prepared by preparation of copper ions and samarium or gadolinium doped cerium oxide-based oxide, doped cerium oxide powder is used as precursor powder to prepare porous ceramic, a part of copper is permeated from lattices to obtain the carbon-resistant and sulfur poisoning-resistant solid-state oxide fuel cell positive electrode after hydrogen reduction on the porous ceramic. The conductivity of the positive electrode is improved, the three-phase reaction interface of the positive electrode is added, the carbon-resistant and sulfur poisoning-resistant solid-state oxide fuel cell positive electrode has favorable structure stability and excellent carbon-resistant and sulfur poisoning-resistant performance, and agglomeration can be prevented.According to the preparation method, copper is introduced to the positive electrode by ion doping and desolvation effect, a positive electrode-supported solid-state oxide fuel cell can be directly prepared by a traditional pressing or curtain coating and sintering method, the complicated process of the copper-containing positive electrode prepared by an impregnation reduction method is prevented,and the industrialization implementation becomes probable.