32results about How to "Increase the electrochemical reaction area" patented technology

The invention discloses a fuel cell electrode with a catalyst growing on an ordered structure microporous layer in situ and a preparation method of a membrane electrode, and relates to the field of fuel cells. The fuel cell electrode comprises an electrode substrate layer, a hydrophobic layer, an ordered structure hydrophilic layer and a catalyst, wherein a hydrophobic layer is prepared on the electrode substrate layer, a hydrophilic layer with an ordered structure is prepared on the hydrophobic layer, and catalysts are uniformly distributed on the hydrophilic layer with the ordered structure.According to the invention, the platinum-based catalyst directly grows on the hydrophilic layer with the ordered structure in situ, so that the catalyst shows different morphologies such as nanoparticles, nanowires, nanorods and nano dendrites on the microporous layer, the electrochemical active surface area and catalytic activity are increased, the transmission resistance between the microporouslayer and the catalytic layer is reduced, and the performance of the battery can be effectively improved; in addition, the catalysts with special morphologies such as nanowires, nanorods, nano dendrites and the like have excellent stability, so that the durability of the battery is effectively improved.

The invention relates to an electrode for an alkaline water electrolysis full battery and a preparation method thereof. The full battery includes a water electrolysis cell body, and the water electrolysis cell body is separated into a cathode cavity and an anode cavity which are not connected to each other by a diaphragm. The cavity and the anode cavity are respectively equipped with a cathode and an anode, and the diaphragm is a sulfonated polyether ketone ion exchange membrane; the anode is a hydrated cobalt-nickel sulfide nanosheet or a hydrated cobalt-nickel sulfide strip formed in situ on the surface of the nickel-based substrate bring. The electrode with this structure has the characteristics of high surface roughness and large electrochemical reaction area. The existence of two-dimensional nanosheets can not only promote electron transfer and material transport, but also provide more reactive sites for water electrolysis reactions. Thereby reducing the onset potential of OER and increasing the speed of water electrolysis reaction. Since the substrate Ni is relatively stable in an alkaline environment, the incorporation of Co elements makes the structure of nickel sulfide more stable, thereby maintaining its structure and catalytic performance during continuous water electrolysis.

A high-power ring-shaped energy storage battery, including several layers of ring-shaped walls made of solid electrolyte coaxially set together, the two ends of the ring-shaped wall are respectively fixed on the insulating circular base and the circular upper cover, all the ring-shaped walls Together with the circular base and the circular upper cover, several layers of airtight chambers are enclosed together. The adjacent airtight chambers are filled with positive electrode materials or negative electrode materials at intervals. When the battery is running, the positive and negative electrode materials are both in liquid state; The bottom of the body draws out the positive and negative current lead-out poles respectively and gathers them to form the positive and negative poles of the battery. The battery provided by the invention has a large electrochemical reaction area and a current flow area, has excellent electronic conductivity, can reach a sufficiently large current density, and ensures a sufficiently high charge and discharge rate and power, and has a simple structure and low cost. It is cheap, can determine size parameters according to different capacity requirements, is easy to expand in scale, and can meet different capacity and space requirements.

The invention discloses a three-dimensional porous lithium manganate film electrode, a preparing method of the three-dimensional porous lithium manganate film electrode and the application of the three-dimensional porous lithium manganate film electrode as the positive pole of a lithium ion battery. The preparing method includes the steps that a high-molecular polymer porous film with a hydrophilic surface is obtained through pretreatment; the chemical bath deposition method is used for depositing manganese oxide to the surface of the high-molecular polymer porous film with the hydrophilic surface so as to obtain a precursor film containing manganese; the precursor film containing manganese is soaked into a solution containing lithium, and the mixed solution reacts in the protective atmosphere for 0.5-8 h at the temperature of 250 DEG C-400 DEG C and then reacts in the air atmosphere for 1-10 h at the temperature of 500 DEG C-900 DEG C to obtain the three-dimensional porous lithium manganate film electrode finally. The three-dimensional porous lithium manganate film electrode is an overall electrode, does not need addition of an adhesion agent or a conductive agent, has excellent rate performance and cycling stability and can be widely applied to the fields of high-performance lithium ion batteries and the like as the positive pole of the lithium ion battery.

The invention discloses a lead-carbon battery for a motorcycle. The lead-carbon battery comprises positive grid, a positive lead plaster coated on the positive grid, a negative grid and negative lead plaster coated on the negative grid, wherein the positive lead plaster is prepared from the following raw materials in parts by weight: 100 parts of lead powder, 9-10 parts of dilute sulfuric acid which is 1.400 in density, 0.02-0.03 part of short fiber, 0.15-0.3 part of graphite and 13-14 parts of purified water; and the negative lead plaster is prepared from the following raw materials in parts by weight: 100 parts of lead powder, 0.95-1.15 parts of expanding agent, 1-4 parts of complex carbon material, 7-8 parts of dilute sulfuric acid which is 1.400 in density, 0.015-0.025 part of short fiber and 11-14 parts of purified water. The positive and negative active substance utilization ratio of the prepared lead-carbon battery for the motorcycle is increased by 15-25 percent in comparison to a conventional battery. When the battery is started for discharging at large current at the multiplying power of 8-10 times, the output power is stable.

A high-performance electric vehicle battery electrode plate includes a positive plate and a negative plate. The size of the positive plate is 66.5 mm in width, 143 mm in height and 2.06 mm in thickness, the [alpha] value of the positive plate is 1:13 and the MS value of the positive plate is 3.5 g / cm<2>, thereby increasing the electrochemical reaction area and further improving high-current discharge performance of the battery. The size of the negative plate is 66.5 mm in width, 144 mm in height and 1.42 mm in thickness, the [alpha] value of the positive plate is 1:11 and the MS value of the positive plate is 2.3 g / cm<2>, thereby increasing the electrochemical reaction area and further improving high-current discharge performance of the battery. According to the invention, during design of the polar plates, by means of accurate design of the [alpha] value and the MS value and improvement of shape structure and design with combination of the shape and structure of the battery, the electrochemical reaction area of the plates can be increased, and further the high-current discharge performance of the battery is enhanced and circulating service life of the battery is prolonged.

The invention discloses an in-situ preparation method of a fuel cell electrode based on a double-layer ordered microporous layer, and relates to the field of fuel cells. The method includes treating the electrode base layer, preparing a hydrophobic layer, preparing an ordered hydrophilic layer, and preparing In situ growth of platinum-based catalysts on the hydrophilic layer. In the fuel cell electrode prepared by the present invention, the Pt-based catalyst is directly grown in situ on the ordered microporous layer, so that the Pt-based catalyst exhibits different forms such as nanowires and nanodendrites, which increases the electrochemically active surface area and catalyst stability. It reduces the transmission resistance between the microporous layer and the catalytic layer, and can effectively improve the performance of the battery. Under low-temperature fuel cell operating conditions, the electrode exhibits better battery performance than conventional electrodes.

The present invention provides a CO 2 A method for preparing an electrode catalyst for electrochemical reduction, in a soluble strongly acidic mixed solution containing soluble Cu salt and a second alloy element, at room temperature and in an inert atmosphere, using a thin sheet-shaped conductive material as a substrate, using a rapid current deposition process Precipitated hydrogen bubbles are used as templates to obtain. Catalysts prepared by this method are sensitive to CO 2 The electrochemical reduction has excellent electrocatalytic activity and structural stability. The faradaic efficiency of CO is greater than 90%, and the optimum is 98%. The continuous and stable operation exceeds 30h, and the decrease in faradaic efficiency of effective products is less than 5%.

The invention relates to a titanium-based pore-forming agent and its application in fuel cells. The pore-forming agent is prepared by using butyl titanate or tetrabutyl titanate, polyacrylonitrile and polyvinylpyrrolidone as raw materials TiO 2 ‑PAN‑PVP coaxial composite fiber, which is prepared by preparing butyl titanate or tetrabutyl titanate into TiO 2 Sol, polyacrylonitrile and polyvinylpyrrolidone are prepared as PAN-PVP mixed solution, and then operated on a coaxial high-voltage electrospinning machine, the inner pinhole is placed with PAN-PVP mixed solution, and the outer pinhole is placed with TiO 2 Sol, rotating drum collector to collect TiO 2 ‑PAN‑PVP coaxial composite fiber, in the process of preparing the anode, after removing the fiber by high pressure heating, TiO 2 Remains in the channel, which helps to improve the connection of the anode inside the hole; TiO 2 It is nano-particles with a large specific surface area, which can increase the electrochemical reaction area; reduce the activation polarization of the battery as a whole, reduce the internal resistance of the battery, and accelerate the diffusion of substances, thereby ultimately improving the output performance of the battery and slowing down the attenuation of the specific capacity.

The present invention relates to a CO 2 Electrode for electrochemical reduction and its preparation and application. The electrode is made by soaking the base material in the electroplating solution containing the main salt and additives after removing impurities, and performing electrochemical deposition under the protection of an inert atmosphere and stirring conditions to obtain surface growth. Electrodes with micron Cu particles; the proportion of side atoms of Cu particles deposited on the surface of the prepared electrode substrate is much higher than that of corner atoms, which is conducive to improving the coverage of CO* on the electrode surface, and providing support for the subsequent CO* dimerization reaction and The hydrogenation reaction provides a favorable environment, which has the effect of significantly inhibiting the side reaction of hydrogen evolution, and at the same time has a high C 2 h 4 selective.

The invention discloses a TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle lithium ion battery cathode material and a preparation method thereof, and belongs to the technical field oflithium ion batteries. The preparation method of the lithium ion battery cathode material comprises the steps of coating a layer of SiO2 on the surfaces of TiO2 nanoparticles P25 through a classic stober method, then coating the surface of the SiO2 with a layer of TiO2 through an isopropyl titanate hydrolyzing method and removing the SiO2 layer to obtain the TiO2 hollow mesoporous spherical shellcoating TiO2 nanopartile material. When the TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle disclosed by the invention is used as the lithium ion battery cathode material, the TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle shows a good charge-discharge property and cycling stability. The preparation method disclosed by the invention has the advantages of simple synthesizing technology, moderate reaction condition, lower cost and suitability for large-scale synthesis.

The invention discloses a three-dimensional LiMn 2 o 4 The preparation method of thin-film positive electrode and three-dimensional all-solid-state thin-film lithium-ion battery, including LiMn with Li excess 2 o 4 The material is used as the target, the chamber is evacuated, the substrate is heated, argon and oxygen are introduced, and the chamber gas pressure is adjusted; three-dimensional LiMn is obtained on the substrate. 2 o 4 thin films; for the obtained three-dimensional LiMn 2 o 4 Thin film annealing. A solid electrolyte film, a negative electrode film, and a negative electrode current collector are sequentially plated on the three-dimensional positive electrode film. The beneficial effects are: the preparation of the thin-film positive electrode does not need to use a template, and the three-dimensional structure is directly obtained by direct current magnetron sputtering, the method is simple, the cost is low, and it is easy to industrialize; the new electrode improves the LiMn 2 o 4 The specific surface area of ​​the material reduces the contact resistance and achieves high rate performance. The three-dimensional all-solid-state thin-film battery made of three-dimensional thin-film electrodes has excellent rate and cycle stability, and increases energy density and power density per unit area.

The invention discloses a method for preparing a graphene-loaded Fe1.5(PO4)OH hollow octahedron lithium ion battery positive electrode material. The method comprises the following steps: dissolving commercially available graphene oxide in deionized water; performing ultrasonic treatment to form turbid liquid A in which graphene oxide is uniformly dispersed; adding analytically pure soluble bivalent ferrous salts, urea and ammonium dihydrogen phosphate or diammonium hydrogen phosphate into a mixed solution of deionized water and ethylene glycol or glycerin, stirring and adding the mixture into the turbid liquid A to prepare a mixed solution B; carrying out microwave reaction on the mixed solution B so as to obtain a product C; and finally, performing centrifugal collection on the product C, washing, performing freeze drying, thereby obtaining the Fe1.5(PO4)OH hollow octahedron lithium ion battery positive electrode material in in-situ growth on the graphene surface. According to the method disclosed by the invention, the time is short, the reaction is fast, the yield is high, raw material price is low and the method is suitable for large-scale production.

The invention relates to a hollow fiber pore-forming agent and its application in fuel cells. The pore-forming agent is PAN-PVP coaxial hollow fiber, and its preparation method is to combine polyacrylonitrile, polyvinylpyrrolidone Prepare a PAN-PVP mixed solution, and then operate it on a coaxial high-voltage electrospinning machine, place methyl silicone oil in the inner pinhole, place a PAN-PVP mixed solution in the outer pinhole, and rotate the drum collector to collect the PAN-PVP coaxial hollow fiber. The PAN-PVP hollow fiber of the present invention can form a three-dimensional network cross-linked cavity after the anode of the fuel cell is fired to remove the fiber, which helps to improve the connection of the anode inside the hole, increases the internal specific surface area of ​​the electrolyte, and reduces the battery overall. Activate the polarization, increase the electrochemical reaction area, reduce the internal resistance of the battery, and accelerate the diffusion of substances, thereby ultimately improving the output performance of the battery and slowing down the decline in specific capacity.

The invention relates to an anode applied to a direct hydroboron fuel battery and a preparation method of the anode. The anode consists of a catalyst layer and a diffusion layer which are mutually overlapped, wherein the diffusion layer is characterized in that a carbon material or foamed nickel is used as a substrate, and a leveling layer of which the surface is of a micro columnar structure is formed on the substrate; the catalyst layer is that an electrocatalyst for catalyzing a hydroboron to oxidize, and a mixture of a hydrogen evolution inhibitor and an adhesive are used as the raw materials for preparing the catalyst layer on the surface of the leveling layer. The anode prepared by adopting the method has the advantages that the electrochemical reaction area is expanded, the area of an interface between a gas diffusion layer and a catalytic active layer is increased, the active resistance and the ohmic resistance are reduced, the fuel utilization rate is increased, and the performance and the stability of the direct hydroboron fuel battery are improved.