34results about How to "Improve hydrogen evolution activity" patented technology

The invention relates to an efficient and porous MoS2-Zn hydrogen evolution electrode. According to the electrode, nanometer-scale molybdenum disulfide particles are adopted as a source of molybdenum, the composite electro-deposition mode is adopted, the nanometer-scale molybdenum disulfide particles, Ni and Zn are all deposited to the surface layer of a conductive substrate, potassium hydroxide solution water-bath constant-temperature treatment is carried out after electro-deposition is completed, and finally the efficient and porous MoS2-Zn hydrogen evolution electrode is prepared. The invention further relates to a preparation method of the efficient and porous MoS2-Zn hydrogen evolution electrode. The method includes the steps of 1, pre-treating the conductive substrate; 2, carrying out composite electro-deposition on the nanometer-scale molybdenum disulfide particles; and 3, carrying out constant-temperature water-bath treatment on the electrode subjected to composite electro-deposition in a constant-temperature water-bath kettle through alkaline liquor for removing Zn. The method has the advantages that the operation is simple, the production cost is low and the structure of a catalyst layer is firm, and the catalytic active hydrogen evolution electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.

The invention relates to a Pt@Ni-SNT / graphene hydrogen evolution catalyst and its preparation method and application, belonging to the technical field of hydrogen production by electrolysis of water. The invention prepares Ni-silicate nanotubes by an in-situ one-step hydrothermal method, coats Pt nanoparticles in the tube wall through the confinement effect of the silicate nanotubes, and composites them with graphene. The silicate nanotubes in the invention can effectively prevent the growth and loss of Pt nanoparticles, and greatly improve their dispersibility, and the Pt can form a synergistic effect with the transition metal Ni to further improve the hydrogen evolution activity of the catalyst. The catalyst obtained in the present invention has excellent hydrogen evolution activity when the loading amount of the noble metal is lower (5wt%), and the current density is 10 mA / cm 2 The overpotential of 167mV is significantly better than that of PtNi alloy / graphene with the same loading, and it is close to commercial 20wt%Pt / C, which has great economic and social value.

The invention relates to a Pd@Ni-SNT / graphene hydrogen evolution catalyst as well as a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. Ni-silicate nanotubes are prepared through an in-situ one-step hydrothermal method, Pd nanoparticles coat the interior of the tube walls of the Ni-silicate nanotubes through the confinement effect of the silicate nanotubes, and the Pd nanoparticles are compounded with graphene. The silicate nanotubes can effectively prevent growth and loss of the Pd nanoparticles, the dispersity of the Pdnanoparticles is greatly improved, Pd and transition metal Ni can form a synergistic effect, and the hydrogen evolution activity of the catalyst is further improved. The catalyst obtained by the invention has excellent hydrogen evolution activity when the loading capacity of noble metal is relatively low (6.2 wt%); and the overpotential at the current density of 10 mA / cm<2> is 170 mV, is obviously superior to that of PdNi alloy / graphene with the same loading capacity and is close to that of commercial 20 wt% Pd / C, and the catalyst has high economic and social values.

The invention discloses a synthetic method of a sheet-shape Co2P-carbon cloth composite material. The method comprises the following steps that 1, a Co (OH) (CO3) 0.5.xH2O / CC compound is synthesized through a hydrothermal method; 2, a phosphorization process is carried out. According to the method, the sheet-shape Co2P is successfully grown on the carbon cloth (Co2P-CC) through a simple method, and has relatively high electrocatalytic activity for a hydrogen evolution reaction under all PH values; and an electrochemical measurement result shows that the sheet-shape Co2P-CC shows up excellent hydrogen evolution activity, when a current density is 10 mA cm<-2>, the electric potential of the sheet-shape Co2P-CC is 103 mV, and a Tafel's slope is 80 mV decade<-1>.

The invention is an emergency power supply, specifically, a metal / seawater battery. The battery has the characteristics of both metal / water battery and metal / air battery. The battery mainly includes a dual-function cathode, an alloy anode, a diaphragm and a battery case. The battery structure is a "sandwich" configuration, with two cathodes sandwiching an anode, the electrodes are separated by a separator, and the battery case is a hollow structure. The invention effectively combines the advantages of the metal / water battery and the metal / air battery. When the battery is floating on the sea surface, the metal / air battery and the metal / water battery are used for dual-mode discharge, and when the battery is full of seawater, the metal / water battery mode is used. Discharge, the dual-mode battery can effectively cope with the complex working environment on the sea. The battery has long storage life, good stability, high mass specific energy and simple structure, and is an ideal sea surface emergency power supply.

The invention discloses a porous nickel-based hydrogen-evolving electrode composite material. The foamed metal of the porous nickel-based hydrogen-evolving electrode is used as a base material, and a S-La-Ni alloy is electrolytically deposited through an ionic liquid, and then the aluminum is removed by corrosion treatment in an alkaline solution to obtain a porous material. Electrode, then sulfur modified by heat treatment, the specific surface area of ​​the composite material is 20‑23g / m 2 , good hydrogen evolution catalytic activity and excellent chemical stability.

The invention discloses a method for preparing a cathode for weakly alkaline beauty water. The cathode uses porous nickel-based hydrogen-evolving electrode foam metal as a substrate, electrolytically deposits a S-La-Ni alloy through an ionic liquid, and then corrodes it in an alkaline solution. Treatment removes aluminum to obtain a porous electrode, and then undergoes sulfur modification by heat treatment. When electrolyzing water to prepare weakly alkaline beauty water, it shows extremely high catalytic activity and chemical stability.

The invention provides a kind of porous Ni-La / foam metal material doped with sulfur as the cathode, and the inert metal material as the anode, through the ion exchange membrane, the electrolytic cell is divided into an anode chamber, an intermediate chamber and a cathode chamber, and the middle The mixed solution of potassium carbonate, potassium bicarbonate and purified water is introduced into the room, the water is purified into the cathode chamber and the anode chamber, and the power is turned on for electrolysis to obtain a fungicide. The pH of the fungicide is 12.5±0.3, and no surface activity is added. Antiseptics, preservatives or other additives, the main components are purified water and trace mineral elements, and the cleaning effect of the bactericides is >99.9%.

The application belongs to the technical field of solid oxide electrolytic cells, and in particular relates to a hydrogen electrode of a solid oxide electrolytic cell, a preparation method thereof, and a solid oxide electrolytic cell. The preparation method of the present application includes the following steps: step 1, mixing NiO, yttria-stabilized zirconia, a second pore-forming agent and a solvent to obtain a second mixture, placing the second mixture on the surface of the hydrogen electrode support, and drying Pre-sintering after drying to obtain a pre-hydrogen electrode; wherein, the mass ratio of NiO to yttria-stabilized zirconia is (0.6 to 2.3): 1; step 2, the nanoparticles are arranged on the pre-hydrogen electrode, and then sintered to obtain Hydrogen electrode for solid oxide electrolysis cells. The application discloses a hydrogen electrode of a solid oxide electrolytic cell and a preparation method thereof, which can effectively solve the technical problem of poor uniformity and controllability of the pore structure and porosity of the existing Ni-YSZ porous cermet.