35results about How to "High onset potential" patented technology

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.

The invention discloses a stamen-type S-doped manganese-copper electrocatalyst based on metal polyphenol modified sodium alginate / nanocellulose composite airgel, and the manganese-copper electrocatalyst is C@MnOCu 7.2 S 4 -TA. The nanocellulose prepared by the acid hydrolysis method introduces a large amount of sulfur doping, and the three-dimensional network structure of the sodium alginate / nanofiber composite airgel has a large number of pores as a porous carbon template, which increases the contact area with the precursor metal solution, making the tannin The modified metal polyphenol network is uniformly distributed in the sodium alginate / nanofiber composite airgel. The nanocomposite material synthesized after high temperature carbonization presents a stamen shape. The invention is used to solve the shortcomings of existing fuel cell catalysts, such as low reversibility of cathode oxygen reduction reaction, small exchange current density, high cost of Pt-based catalytic materials and poor toxicity resistance, etc. The obtained oxygen reduction catalyst has high potential, Excellent limiting current and high methanol tolerance and other advantages.

The invention relates to a method for preparing a bayberry-shaped cobalt-nickel-boron composite carbon material proton membrane fuel cell catalyst. The nanomaterial active substance is a bayberry-shaped cobalt-nickel-boron composite carbon material, referred to as CoNi@TA / B. Solve the existing problems of existing fuel cell catalysts and overcome the defects of the prior art. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, as well as defects such as high cost and toxicity of Pt-based catalytic materials; based on CoNi MOF With a unique structure, a metal-organic framework nanocomposite material for proton membrane fuel cells has been developed, which has high onset potential, half-slope potential, excellent limiting current, excellent stability and good methanol tolerance, It has the advantages of strong resistance to methanol poisoning.

The invention discloses a method for preparing a copper hydroxide two-dimensional nanocomposite material based on iron-based dopamine supramolecular modification, which uses CuCl 2 , PEG, etc. as raw materials to prepare Cu(OH) 2 nanosheets, which were then dispersed in absolute ethanol to obtain Cu(OH) 2 solution, then add dopamine and Fe(NO) 3 9H 2 O, through hydrothermal reaction and heat treatment, a 2D material that can be used as a fuel cell anode material is finally prepared Cu(OH)2 @PDA‑Fe. The composite material obtained in the present invention has higher initial potential, half-slope potential, excellent limiting current, excellent stability and good methanol tolerance, has strong resistance to methanol poisoning, etc., and can solve the problem of existing fuel cells. The catalyst has problems such as single precursor, high cost and toxicity of Pt-based catalytic materials, and it is expected to be used to replace Pt / C catalysts.

The invention relates to a preparation method of a plant polyphenol-modified supramolecular network frame structure manganese-based nanocomposite electrocatalyst, wherein the nanomaterial active substance is ZIF-8@TA-Mn. Solve the problems of existing fuel cell catalysts and overcome the defects of the existing technology. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, as well as the high cost and toxicity of Pt-based catalytic materials. Based on ZIF‑ 8 Unique structure, developed a metal-organic framework nanocomposite for proton membrane fuel cells with high onset potential, half-slope potential, excellent limiting current and excellent stability and good methanol tolerance , has the advantages of strong anti-methanol poisoning ability.

The invention discloses a preparation method and application of a functionalized graphene ORR catalyst. Including: S1 synthesis of graphene sulfide; S2 synthesis of alkyl branched modified graphene sulfide; S3 synthesis of metalloporphyrin; S4 synthesis of functionalized graphene ORR catalyst. Application: Functionalized graphene ORR catalysts for cathodic oxygen reduction reactions in metal-air batteries and dye batteries. The functionalized graphene ORR catalyst prepared by the invention has good electrical conductivity, high initial potential, effectively reduces the overpotential of oxygen reduction, and its catalytic performance can be comparable to that of commercial Pt / C. The catalyst is used to assemble the liquid electrolyte zinc-air Battery, the open circuit voltage, maximum power density and constant current discharge time of the battery are better than commercial Pt / C; the preparation method of the present invention is simple, the preparation cost is low, and the repeatability is good, which is beneficial to the development of new electrochemical catalysts and energy conversion and Storage devices have important theoretical and practical significance.

The invention discloses a zinc-nitrogen modified double-carbon catalytic material, a preparation method thereof, and an application in a zinc-air battery. Using dimethylimidazole and zinc salts as raw materials to synthesize metal frame ZIF-8, the metal frame ZIF-8 is subjected to the first heat treatment in a protective atmosphere to obtain zinc-modified porous carbon materials, and zinc-modified porous carbon materials are combined with sugar compounds. After mixing with nitrogen source compounds by ball milling, a second heat treatment is performed in a protective atmosphere to obtain a zinc-nitrogen modified double-carbon catalytic material; the catalytic material has zinc-nitrogen double modification, is rich in defects and porous structure, and has good electrical conductivity and It has a 3D network structure and is applied to a zinc-air battery to obtain high power density and specific capacity; the preparation method of the catalytic material has low cost, simple steps, and is beneficial to industrial production.

The invention discloses a TPhP degradation method, a biochar-inorganic mineral composite material and a preparation method thereof, wherein the TPhP degradation method comprises the following steps: S1: preparing N-doped biochar-inorganic mineral composite material; S2: Measure the concentration of TPhP in the sewage and the degradation rate of the prepared composite material, and calculate the amount of the composite material required for degradation; S3: Add PDS to the sewage water body, adjust its concentration to a predetermined value, and add the composite Stir or vibrate the material for 4-8 hours to make the composite material catalyze and activate PDS, absorb and degrade TPhP in the water body; S4: measure the concentration of TPhP in the treated water body, and repeat steps S2-S3 if it does not meet the standard , until the target is reached. The invention also provides a biochar-inorganic mineral composite material and a preparation method thereof. The method and material provided by the invention have simple process, wide sources, environmental friendliness, high efficiency and low cost, and can meet the needs of wide-scale popularization and application.

The invention discloses a metal nitride / carbon composite material derived from ZIFs and its preparation method and application. The method comprises: NiCo 2 o 4 Mix and grind nanospheres and 2-methylimidazole, and sinter at 700-900°C in a mixed gas of ammonia and inert gas to obtain composite materials; or, obtain zinc salt and 2-methylimidazole in methanol solution ZIFs precursor, adding the ZIFs precursor to NiCo 2 o 4 Stir in the methanol solution of nanospheres and dispersant, separate the solid, heat the solid to 700-900°C under the protection of inert gas, and then sinter in the mixed gas of ammonia and inert gas, and wait until the sintering is completed under the protection of inert gas The temperature is lowered to obtain a composite material. The method of the invention effectively avoids the agglomeration of metal particles and the structural collapse of ZIFs during the nitriding process, significantly accelerates the electron conduction rate and improves the reaction efficiency.

The invention belongs to the technical field of semiconductor electrodes, and discloses a silicon-based semiconductor PN junction structure, a preparation method, a photocathode and applications thereof. TiO is deposited on the surface of a p-type silicon substrate. 2 Nanocrystalline layer, TiO 2 The nanocrystalline layer forms Schottky contact with the p-type silicon substrate after reduction treatment to obtain a p-type silicon-titania heterojunction structure; its crystalline TiO 2 The Pt auxiliary agent loaded on the nano-layer constitutes a silicon-based semiconductor PN junction photocathode, and the photocathode is used in the photoelectrochemical cell for photo-splitting water for hydrogen production. The silicon-based semiconductor PN junction structure of the present invention can generate high photo-generated voltage and has high stability, and at the same time, the preparation method is simple and easy to implement, has strong controllability, and can realize large-scale production; the silicon-based semiconductor PN of the present invention Junction photocathode utilizes n-type TiO 2 The nanocrystalline layer successfully promotes the separation of photogenerated carriers, improves the onset potential of the silicon-based photocathode, and also protects the p-type silicon substrate.