The invention provides a method for producing porous nickel-based ruthenium oxide composite hydrogen evolution electrode and belongs to the technical field of electrolytic hydrogen production. The method includes that air bubbles generated by cathodic hydrogen evolution reaction are utilized as a template agent, a nickel ordered porous structure is constructed on the surface of a nickel base, specific surface area of an electrode is increased, and subsequent dispersion of ruthenium oxide active species is promoted; ruthenium is deposited on a porous nickel-based precursor electrode, the porous nickel-based precursor electrode is placed in a muffle furnace for annealing to form the porous nickel-based ruthenium oxide composite hydrogen evolution electrode, interaction force between a catalytic layer and the base is enhanced, and pore canals are still open, so that hydrogen generated in the process of reaction of the electrode can be timely diffused away from the electrode, shedding of the catalytic layer in the process of hydrogen evolution is prevented, and the electrode is enabled to demonstrate high hydrogen evolution catalytic activity and stability. The method is simple and easy to implement, safe in operation, low in production cost and suitable for electrolytic reaction in chlorine industry and water-electrolysis hydrogen production under the condition of high current density.

Method for producing porous nickel-based ruthenium oxide composite hydrogen evolution electrode

The invention discloses a method for electro-chemical compounding of graphene and metallic oxide The method comprises the following steps of: (1) adding a graphite flake as a positive electrode and a platinum sheet as a negative electrode into an electrolyte solution; (2) adding variational voltage for 1-60 minutes between the positive electrode and the negative electrode; and (3) centrifuging, washing and carrying out vacuum drying to obtain a compound of the graphene and the metallic oxide The compound material of the graphene and the metallic oxide, prepared by the method, has excellent electrical transmission performance and excellent performances, can serve as a lithium ion battery cathode material and a photocatalytic-degraded organic pollutant material and is simple to operate and suitable for large-scale industrial production

Method for electro-chemical compounding of graphene and metallic oxide

The invention discloses a preparation method for energy storage capacitors, which belongs to methods for preparation of anodes and cathodes of capacitors. A dielectric film is prepared on a valve metal anode by means of twice electrochemical oxidation, and an amorphous hydrated ruthenium oxide cathode is prepared by means of thermal decomposition of ruthenium compound in the vapory environment, so that dehydration and crystallization of the ruthenium oxide can be avoided, the obtained ruthenium oxide cathode is higher in specific capacity, and capacity of the anode and equivalent series connection resistance can be completed led out to obtain higher capacity. The leakage current coefficient of the anode prepared by the method can be reduced below 0.0008, and operating voltage can be higher than 100V. The cathode prepared by the method needs no additional binder, so that the defects of poor reliability of components and the like caused by high internal resistance of the capacitor and proneness in failure of the binder can be overcome thoroughly. Capacitors manufactured by the method have the advantages of high specific capacity, low internal resistance, large output power density, wide applicable temperature range, high adhesion of a cathode ruthenium oxide coating.

Preparation method for energy storage capacitors

The invention discloses a preparation method for a ruthenium-oxide-based electrode material. The preparation method comprises the following steps of dissolving 2-5 g of hydration ruthenium trichloride and 1-3 g of carbon material into 100-200 ml of alcohol-water solution, and evenly mixing the mixture to obtain mixed solution; adding 10-150 ml of NH4HCO3 solution with the concentration of 1.0-2.0 mol/L into the mixed solution, and adjusting a PH value into 7-9 to obtain Ru(OH)4; after aging is conducted and foreign ions are removed in a centrifugal mode, conducting dehydration processing to obtain a composite electrode material of amorphous ruthenium dioxide and the carbon material; adding a conductive agent of carbon nano-tubes or KS6 conductive graphite counting for 10-20% of the total weight into the prepared composite electrode material, and fully mixing and grinding the mixture to obtain the ruthenium-oxide-based electrode material. Precursors adopted in the preparation method for the ruthenium-oxide-based electrode material are the hydration ruthenium trichloride, the carbon material and ammonium bicarbonate, mixing is more even, the carbon nano-tubes or KS6 conductive graphite is selected to serve as the conductive agent, the composite electrode material has the advantages of being high in specific capacity, low in equivalent series resistance, long in service life, low in cost and the like.

Preparation method for ruthenium-oxide-based electrode material

Hydrated-structured SnO2 (stannic oxide)/IrO2 (iridium oxide) xH2O oxide film electrode material and preparation method for same

The invention discloses a preparation method of a ruthenium oxide electrode material, relating to the field of preparation of ruthenium oxide electrode materials for super capacitors. The ruthenium oxide electrode material is obtained on an electrode in a thermal decomposition mode. The preparation method comprises the steps of: preparing a ruthenium-containing compound into slurry, then coating the slurry on a collector electrode, pre-drying and then thermally decomposing under the protection of steam, and finally regulating steam concentration and thermal decomposition temperature to obtain the amorphous hydration ruthenium oxide electrode material with excellent property. The method has the advantages of simple process and easiness in massive production; and the prepared amorphous hydration ruthenium oxide electrode material has the characteristics of high specific volume, low internal resistance, stable performance and the like.

Preparation method of ruthenium oxide electrode material

The invention discloses an electrochemical preparation method of a ruthenium oxide electrode material, belonging to a preparation method of the ruthenium oxide electrode material for a capacitor, and aims to provide a method for preparing ruthenium oxide electrode material, which is of simple process and has high specific capacity and low internal resistance. The method comprises the following steps: adding hydrochloric acid into 0.005-0.1 mol/L RuCl3 aqueous solution and adjusting the pH value to 1-5; inserting a collector, a reference electrode and an auxiliary electrode; and performing electrochemical cyclic voltammetry deposition with alternating current, wherein the initial level is (-1.4)-1.9 V, the final level is (-1.4)-1.9 V, the upper limit of level is 1.2-1.9 V, the lower limit of level is (-1.4)-(-0.6) V, the scanning rate speed is 1 mV/s-10 V/s, and the cycle index is 100-1,000. According to the invention, the prepared capacitor has large specific capacity, small internal resistance and fast charge/discharge; and the electrochemical preparation method is an ideal method for preparing the ruthenium oxide electrode material of the capacitor.

Electrochemical preparation method of ruthenium oxide electrode material

The invention discloses a method for preparing a ruthenium oxide coating on the inner wall of a tantalum shell of an electrolytic capacitor, belonging to capacitor cathode preparation methods. The method comprises the following steps of: mixing a ruthenium compound and valve metal powder to a powder mixture, and mixing the powder mixture and a solvent to obtain a slurry; evenly applying the slurry onto the inner wall of the tantalum shell, and drying; putting the dried tantalum shell into a coating furnace, and introducing steam to carry out thermal decomposition; dissolving ruthenium halide into deionized water to obtain an electrolyte, and adding additives to adjust the pH value to 1-5; and injecting the electrolyte into the tantalum shell, introducing a direct current, of which the current density is 5-50mA/cm , to carry out electroplating for 10-30 minutes, putting the electroplated tantalum shell into the coating furnace, and introducing steam to carry out heat treatment for 1-3 hours. The electrolytic capacitor cathode made by the method disclosed by the invention can increase the capacitance of the liquid tantalum capacitor with the same volume by more than one time, and the equivalent series resistance is smaller; and thus, the invention provides a method for preparing an electrolytic capacitor cathode.

Method for preparing ruthenium oxide coating on inner wall of tantalum shell of electrolytic capacitor

The invention provides an electrochemical forming equipment system of an electrolytic capacitor. A cleaning device, a rinsing device, a dewatering/drying device and a wettability improving treatment device which are sequentially connected through a conveyor belt are arranged on an operating table in a pretreatment unit, wherein the wettability improving treatment device in the pretreatment unit is also connected with a forming groove in a forming treatment unit through the conveyor belt; and the forming groove is sequentially connected with a spray device, a boiling washing device, a thermal treatment device and a surface densification device in a post-treatment device through the conveyor belt. Through the arranged pretreatment device, forming treatment unit and post-treatment unit, the pretreatment unit can effectively remove impurities and other pollutants on the surface of an anode body; the forming treatment unit significantly improves the quality of a dielectric oxide film through a low-temperature and high-temperature combination forming device; and the post-treatment unit can fully isolate flaws on the surface of the dielectric oxide film through repairing and densifying processes, so that the risk of a failure of the dielectric oxide film is reduced.

Electrochemical forming equipment system of electrolytic capacitor

The invention discloses a method for preparing a ruthenium oxide electrode of a super capacitor and belongs to a preparation method of an electrode of a capacitor. The method comprises the following steps of: adding valve metal powder and nano ruthenium oxide hydrate into a ruthenium-containing compound paste coated on the surface of a tantalum foil and then putting the dried tantalum foil in the water vapor environment to be thermally decomposed to prepare the amorphous ruthenium dioxide cathode hydrate, therefore ruthenium dioxide dehydration and crystallization can be avoided, thus improving the bonding strength of the ruthenium oxide coating and the tantalum foil and improving the specific capacity of the ruthenium oxide electrode. The electrode of the capacitor, which is prepared by the method, has the advantages of good high temperature resistance, strong vibration resistance, high energy density, high power density and the like and is used for preparing the super capacitor.

Jianhua Ma

Papers

Preparation method of ruthenium oxide electrode material

Electrochemical preparation method of ruthenium oxide electrode material

Method for preparing ruthenium oxide coating on inner wall of tantalum shell of electrolytic capacitor

Electrochemical forming equipment system of electrolytic capacitor

Method for preparing ruthenium oxide electrode of super capacitor