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

The invention provides a preparation method of a transitional metal/nitrogen co-doped hollow carbon nano material and an application method thereof. The preparation method comprises the following steps: preparing a cathodic oxygen reduction reaction catalyst for a fuel battery by taking a surfactant as a soft template; first, synthesizing a hollow polymer precursor by means of self assembly of thetemplate in a hydrothermal process and strong interaction between the template and a carbon source precursor; then doping transitional metals and heteroatoms through an oil bath and full grinding; and finally, putting the reactant in a program control tubular furnace, carrying out carbonizing at a high temperature in an inert atmosphere at 600-900 DEG C to obtain the transitional metal/nitrogen co-doped hollow carbon nano material. The transitional metal/nitrogen co-doped hollow carbon nano material prepared by the method has a relatively high specific surface area, good conductivity and sufficient active site and shows excellent electrocatalytic activity, good stability and methanol poisoning resistance to oxygen reduction reaction. The preparation method is low in cost and simple in process, has certain universality, and has certain guiding meaning in synthesizing the cathodic oxygen reduction reaction catalyst for the fuel battery.

The invention discloses a method for preparing an Au-cluster/carbon nanotube composite catalyst. The method has the advantages that (1) the prepared Au/CNT composite catalyst has high onset potential, cycling stability and durability, and greatly improves catalytic activity of cathodic reaction of fuel cells; (2) the catalyst is prepared through in-situ reduction of a multiwalled carbon nanotube and chloroauric acid, the preparation method is simple and direct under mild reaction conditions with no high temperature and high pressure required, thus the synthetic process is greatly simplified and production cost is decreased; and (3) according to the preparation process, water serves as solvent instead of poisonous harmful organic solvent, at the meantime the preparation process is conducted under room temperature, which is energy-saving and environmentally-friendly and highly fits to the idea of green development and the development requirement on new energies of the modern society, thus the Au-cluster/carbon nanotube composite catalyst has a good market prospect.

A nitrogen-doped carbon-supported iron-based oxygen reduction catalyst is prepared by synthesizing 3, 6-dichloroethane by guanidine nitrate, adding nitric acid to form 3, 6-dichloroethane, adding nitric acid to form 3, 6-dichloroethane, adding nitric acid to form 3, 6-dichloroethane, and adding nitric acid to form 3, 6-dichloroethane. Bis (3, 5-dimethylpyrazole)-1, 2, 4, 5-Tetrazine (BT), and 3, 6-Bis (3, 5-dimethylpyrazole)-1, 2, 4, 5-Imidazole was added into tetrazine (BT) to synthesize 3, 6-Bis (imidazolyl)-1, 2, 4, 5Tetrazine (DT) ligand, and then 3, 6-Bis (imidazolyl)-1, 2, 4, 5-Tetrazine(DT) coordinated with transition metal iron ions to form iron-based zeolite imidazolium ester framework coordination polymer (FeDT ZIF), and then pyrolyzed iron-based zeolite imidazolium ester framework coordination polymer (FeDT ZIF) to prepare nitrogen doped carbon supported iron (Fe N/C) oxygen reduction catalyst. The preparation method of the catalyst is simple, the cost is low, and the catalyst has extremely rich active sites, which is conducive to promote the practical application of fuel cells.

The invention provides GaP nanowires as well as a preparation method and application thereof. The preparation method of the GaP nanowires comprises the following steps: 1) covering a conductive substrate with a catalyst; 2) putting GaP powder into a container; 3) placing the conductive substrate and the container at two sides of a quartz tube with openings at two ends, and putting the obtained quartz tube into a dual-temperature zone tubular furnace; and 4) vacuumizing the dual-temperature zone tubular furnace, introducing a protective gas, performing heating to make the temperature of a firsttemperature zone raised to 930 DEG C-1000 DEG C and the temperature of a second temperature zone raised to 620 DEG C-650 DEG C, and performing heat preservation to obtain the GaP nanowires. The invention also provides GaP/GaPN core-shell nanowires; and the preparation method of the GaP/GaPN core-shell nanowires comprises the following steps: placing the GaP nanowires in a quartz tube with openings at two ends, putting the obtained quartz tube into a reaction furnace, performing vacuumizing, introducing a protective gas, heating the reaction furnace, raising the temperature to 720 DEG C-800 DEG C, stopping vacuumizing and stopping introducing the protection gas, introducing an ammonia gas, and performing heat preservation to obtain the core-shell nanowires. The nanowirs provided by the invention are used as photoelectrodes.

A preparation method of a carbon, silver-copper and polyaniline composite electro-catalyst for oxygen reduction reaction of a fuel cell includes using ethanol as solution and a reducing agent; simultaneously depositing silver nanoparticles and copper nanoparticles on carbon particles by a hydrothermal method to form a carbon-supported silver-copper bimetal nanometer catalyst; and then decorating the particle surface of the catalyst by polyaniline by a chemical method to obtain the carbon, silver-copper and polyaniline composite electro-catalyst. Anhydrous ethanol and Nafion solution are added into the carbon, silver-copper and polyaniline composite electro-catalyst to prepare a corresponding carbon, silver-copper and polyaniline composite electro-catalyst electrode. The carbon, silver-copper and polyaniline composite electro-catalyst is high in electro-catalytic activity in oxygen reduction reaction, oxygen reduction reaction initial potential is 0.160V [vs SHE (versus a standard hydrogen electrode)], and current density is 1.50mAcm<-2> at -0.15V (vs SHE). In addition, the preparation method is simple, the structure of the electro-catalyst is stable, usage of silver which is precious metal is greatly reduced, and the electro-catalyst is widely applied to fuel cells.

The invention provides a cobalt and nitrogen doped carbon nanotube as well as a preparation method and application thereof. The preparation method comprises the steps: taking cobalt acetate, putting into an ethanol solution, stirring and dissolving, adding dicyandiamide into the solution after dissolution, continuing stirring, evaporating a solvent to dryness, and then drying to obtain a powdery precursor; and putting the powdery precursor into a mortar, grinding, transferring into a reaction container, heating a tubular furnace to 900-1000 DEG C, calcining for 0.5-2 h, annealing to obtain a sample, putting the sample into an inorganic acid solution, stirring overnight, carrying out suction filtration, washing, and drying to obtain the cobalt and nitrogen doped carbon nanotube. According to the synthesis method, secondary heat treatment is avoided in one-step synthesis, the synthesis method is simple, the cobalt and nitrogen doped carbon nanotube has high catalytic activity, and the catalyst can be used for a fuel cell cathode oxygen reduction reaction, and is good and uniform in morphology and complete in structure, has high initial potential and half-wave potential and has the potential of replacing a Pt-based catalyst.

The invention relates to a preparation method of a cathode oxygen reduction reaction catalyst based on a two-dimensional graphite phase carbon nitride cobalt doped porous carbon material. An active substance of a nano material is C3N4@Co-BDC-TA. The problems existing in an existing fuel cell catalyst are solved, the defects in the prior art are overcome, the problems of single precursor obstacle and low synthesis cost of the existing fuel cell catalyst are generally faced, and the defects of high cost, toxicity and the like of a platinum-based catalytic material are overcome; and on the basis of a two-dimensional layered g-C3N4 material, a porous carbon material formed by taking tannin as a connecting agent and fixing metal Co with terephthalic acid is developed, and the porous carbon material has the advantages of relatively high initial potential and half-slope potential, excellent limiting current, excellent stability, good methanol tolerance, relatively high methanol poisoning resistance and the like.

The invention discloses preparation of a palladium nano material employing polypeptide as a template, shape and form control and an application of the palladium nano material in oxygen reduction of a fuel cell as an efficient catalyst. The preparation has the advantages that (1) polypeptide introduced in preparation of the material has diversity and specificity, can be biodegraded, contains a self-assembled segment and can be used as a template agent for synthesizing palladium nano materials with different shapes and forms; (2) the synthesis process of the palladium nano material is convenient and fast (carried out under a simple stirring condition), and green and energy-saving (synthesized at a room temperature by employing water as a solvent), the shape and form are controllable (polypeptide palladium nano materials with different shape and form characteristics are synthesized at different Pd/R5 ratios in a regulating manner), and the product property is very stable; and (3) a series of palladium nano catalysts synthesized by the polypeptide R5 (SSKKSGSYSGSKGSKRRIL) as the template have the catalytic performance superior to that of commercial platinum carbon in the aspect of oxygen reduction and have a good application prospect; and a novel cathode material is provided for the fuel cell.

The invention relates to an electrode for an alkaline water electrolysis total battery, and a preparation method of the total battery. The total battery comprises a water electrolysis tank body, whichis divided into a cathode cavity and an anode cavity by a diaphragm, wherein the cathode cavity and the anode cavity are not communicated with each other, a cathode and an anode are respectively arranged in the cathode cavity and the anode cavity, the diaphragm is a sulfonated polyetherketone ion exchange membrane, and the anode is a hydrated cobalt-nickel sulfide nanosheet or a hydrated cobalt-nickel sulfide strip generated on the surface of a nickel-based substrate in situ. According to the invention, the electrode with the structure has the characteristics of high surface roughness and large electrochemical reaction area; due to the existence of the two-dimensional nanosheets, electron transfer and substance transfer can be promoted, and more reaction active sites can be provided for water electrolysis reaction, so that the initial potential of OER is reduced, and the speed of the water electrolysis reaction is increased; and the performance of the substrate Ni is stable in an alkaline environment, and the structure of the nickel sulfide is stable due to the doping of the Co element, so that the structure and the catalytic performance of the nickel sulfide are kept stable in the continuous water electrolysis process.

The invention discloses a double-MOF connection structure nano composite electrocatalyst for a proton membrane fuel cell, and the double-MOF nano composite electrocatalyst for the proton membrane fuel cell is characterized in that the active substance of the nano material is ZIF-8@ TA/ZIF-67@TA. The problems of an existing fuel cell catalyst are solved, the defects of the prior art are overcome, the problems that an existing fuel cell catalyst generally faces a single precursor and is low in synthesis cost are solved, and the defects that a Pt-based catalytic material is high in cost, toxic and the like are overcome. On the basis of a unique connecting structure of ZIF-8 and ZIF-67, the metal organic framework nano composite material for the proton membrane fuel cell is developed, and has the advantages of high initial potential, half-slope potential, excellent limiting current, excellent stability, good methanol tolerance, relatively strong methanol poisoning resistance and the like.

The invention discloses a degradation method of TPHP, a biochar-inorganic mineral composite material and a preparation method of the biochar-inorganic mineral composite material. The degradation method of the TPHP comprises the following steps: S1, preparing an N-doped biochar-inorganic mineral composite material; S2, measuring the concentration of TPHP in sewage and the degradation rate of the prepared composite material, and calculating the dosage of the composite material required by degradation; S3, adding PDS into a water body of the sewage, adjusting the concentration of the PDS to a preset value, adding the composite material, and carrying out stirring or oscillating reaction for 4-8 h so as to allow the PDS to be catalyzed and activated by the composite material and the TPHP in the water body to be adsorbed and degraded; and S4, measuring the concentration of the TPHP in the treated water body, and if the concentration does not reach the standard, repeating the steps S2-S3 until the concentration reaches the standard. The invention also provides the biochar-inorganic mineral composite material and the preparation method thereof. The method and the material provided by the invention are simple in process, wide in source, friendly to environment, high in efficiency and low in cost, and can meet the requirements of large-scale popularization and application.