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

The invention discloses an electrolytic tank and application for an electrochemical reduction reaction of carbon dioxide. The electrolytic tank comprises a cathode chamber, an anode chamber and a gas-liquid separator, wherein the cathode chamber is divided into an upper cavity and a lower cavity; the lower cavity is a container with an open upper end, and the upper cavity is a container with an open lower end; the upper cavity is disposed above the lower cavity; first flange plates are disposed at the opening ends of the two cavities respectively; the two cavities are connected through the first flange plates. Compared with a traditional H-type electrolytic tank, the electrolytic tank can remarkably increase the converting rate of the carbon dioxide and improve electrochemical reaction speed and is easy to operate, and the calculation is convenient.

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.

The invention discloses a fuel cell electrode in-situ preparation method based on a microporous layer with a double-layer ordered structure, and relates to the field of fuel cells, and the method comprises the following steps: treatment of an electrode substrate layer, preparation of a hydrophobic layer, preparation of an ordered hydrophilic layer and in-situ growth of a platinum-based catalyst onthe hydrophilic layer. In the fuel cell electrode prepared by the method, the Pt-based catalyst directly grows on the ordered microporous layer in situ, so that the Pt-based catalyst shows differentforms such as nanowires and nano dendrites, the electrochemical active surface area and the catalyst stability are increased, the transmission resistance between the microporous layer and the catalystlayer is reduced, and the performance of the cell can be effectively improved. Under a low-temperature fuel cell operation condition, the electrode shows more excellent cell performance than a traditional electrode.

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 discloses a lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell, belonging to the technical field of lithium ion batteries. Thepreparation method of the invention is to synthesize TiO2 nanometer particles by the hydrolysis method of isopropyl titanate, Then a layer of MOF-affinity PVP was coated on the surface of TiO2 nanoparticles to make TiO2 nanoparticles absorbed in the growth process of ZIF67. The surface of TiO2 nanoparticles was mosaic and embedded in ZIF67 to form a kind of jujube cake structure. Finally, the final product was obtained by hydrothermal vulcanization with thioacetamide. The CoS hollow shell embedding TiO2 nanoparticles provided by the invention is used as the negative electrode material of thelithium ion battery, and the CoS hollow shell embedding TiO2 nanoparticles have good charge-discharge performance and cycle stability, and have important application value in the lithium ion battery.

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.

A fuel cell electrode with catalysts grown in situ on an ordered structure microporous layer and a method for preparing a membrane electrode assembly (MEA) are disclosed. The fuel cell electrode includes an electrode substrate layer, a hydrophobic layer, an ordered structure hydrophilic layer and catalysts. The hydrophobic layer is prepared on the electrode substrate layer. The ordered structure hydrophilic layer is prepared on the hydrophobic layer. The catalysts are uniformly distributed on the ordered structure hydrophilic layer.

The invention relates to a hollow fiber pore-forming agent and application thereof in fuel cells. The pore-forming agent is PAN-PVP coaxial hollow fiber prepared from peroxyacetyl nitrate and polyvinylpyrrolidone as raw materials, and a preparation method of the pore-forming agent comprises the following steps of preparing a PAN-PVP mixed solution from peroxyacetyl nitrate and polyvinylpyrrolidone; and then operating on a coaxial high-voltage electrostatic spinning machine, placing methyl silicone oil in an inner needle hole, placing the PAN-PVP mixed solution in an outer needle hole, and rotating a roller collector to collect the PAN-PVP coaxial hollow fiber. The PAN-PVP hollow fiber can form a three-dimensional network cross-linked cavity after a fuel cell anode is fired to remove the fiber, so that the connection of the anode in the hole is improved, the internal specific surface area of an electrolyte is increased, the activation polarization of the cell is integrally reduced, the electrochemical reaction area is increased, the internal resistance of the cell is reduced, and the substance diffusion is accelerated, and therefore, the output performance of the cell is finally improved, and attenuation of specific capacity is slowed down.

The invention discloses a high-power annular energy storage battery. The high-power annular energy storage battery comprises several layers of annular walls which are coaxially sleeved together and made of solid electrolyte, the ends of the annular walls are fixed on an insulating round pedestal while the other ends are fixed on a round upper cover, all the annular walls, round pedestal and round upper cover jointly form several layers of closed cavities sleeved together, anode material and cathode material alternatively fill the spaces between adjacent closed cavities at intervals, and when the battery runs, both the anode material and cathode material are in the liquid state; anode current and cathode current are led from the bottoms of the closed cavities and respectively gathered to form an anode and a cathode of the battery. The high-power annular energy storage battery has large electro-chemical reaction area and current flow area and good electronic conductivity; the high-power annular energy storage battery is capable of providing a large enough current density to guarantee a high enough charging/discharging speed rate and power, and moreover, the high-power annular energy storage battery is simple in structure, low in cost, capable of confirming size parameters according to different capacity requirements, easy to expand scale and capable of meeting different capacity and space requirements.

The invention relates to the technical field of battery catalysts, in particular to a preparation method of ZnMn2O4 tube-in-tube nanofibers. The preparation method comprises the following steps that (1), zinc salt and manganese salt are dissolved in ethanol or a mixed solvent of DMF and ethanol, then PVP is added into the obtained metal salt solution, and a spinning solution is obtained after the PVP is completely dissolved; (2), the spinning solution is prepared into the fiber membrane by using a single-nozzle electrostatic spinning method; (3), the fiber membrane is dried, heated and pretreated to obtain the pretreated fiber membrane; and (4), annealing treatment is carried out on the pretreated fiber membrane to obtain the ZnMn2O4 tube-in-tube nanofibers. The ZnMn2O4 tube-in-tube nanofibers are prepared by regulating and controlling the volatilization rate of the solvent in the spinning solution and the subsequent heat treatment process, and has the advantages that the specific surface area is relatively large, and the tube-in-tube structure can effectively relieve the problem of volume expansion of the material in the charge-discharge cycle process, so that the lithium storage performance of the material is improved.