31results about How to "Excellent oxygen reduction activity" patented technology

The invention discloses a fuel cell electrocatalyst and a preparation method and application thereof. The fuel cell electrocatalyst comprises a metal nitrogen-carbon carrier material, platinum precursors are adsorbed to micropores of the metal nitrogen-carbon carrier material, and platinum reduced through an electrochemical reduction method and metal in a carrier form an alloy. The preparation method of the catalyst comprises the following steps: (1) preparing a metal nitrogen-carbon carrier; (2) preparing a catalyst precursor; and (3) platinum reduced by an electrochemical reduction method and the transition metal in the carrier forming an alloy. According to the catalyst, metal nitrogen carbon is used as a carrier to adsorb platinum salt, the particle size of platinum particles is limited through the confinement effect of pore channels, transition metal contained in the carrier and Pt form an alloy, the Pt loading capacity can be reduced, the Pt utilization rate can be increased, thepreparation process is simple, and a product has excellent oxygen reduction activity and can be applied to proton exchange membrane fuel cells.

The invention discloses a Co-N / CNTs catalytic material and a preparation method and application thereof. The method comprises the following steps: 1) dissolving carboxylated multi-walled carbon nanotubes in a methanol solution for ultrasonic treatment; (2) adding cobalt chloride into the suspension of the carbon nanotubes and performing stirring; (3) dissolving an organic ligand 2-methylimidazole into a methanol solution, then dropwise adding the mixture into the mixed solution, and then putting the mixed solution into a high-temperature reaction kettle to react; 4) filtering and washing the obtained product with methanol and ethanol for several times, and then performing drying and grinding to obtain powder; 5) performing high-temperature carbonization on the prepared powder in an inert atmosphere to prepare the Co-N / CNTs material. The invention provides the oxygen reduction reaction catalyst which is low in price, convenient and simple, has many active sites and can be widely applied, and the catalyst has excellent catalytic oxygen reduction performance under a neutral condition, can greatly improve the output power of a microbial fuel cell, and is used for improving the oxygen reduction performance and the electricity generation performance of the microbial fuel cell.

The invention relates to a three-atomic-scale dispersed metal cluster fuel cell catalyst. The catalyst comprises a triatomic metal cluster and a nitrogen-doped nanocarbon material, metal in the triatomic metal cluster is dispersed on a substrate in the form of the triatomic cluster, the nitrogen-doped nanocarbon comprises a carbon source and a nitrogen source, and the triatomic metal cluster is loaded on the nitrogen-doped nanocarbon. A fuel cell assembled by the material exhibits an excellent cell performance. The catalyst has the advantages of simple and controllable steps, good reproducibility, and easy realization of industrial production.

The present specification relates to a fuel cell and a method for manufacturing the same.

The invention discloses a preparation method of an iron-based triazine ring polymer catalyst, which comprises the following steps of: mixing 1, 4-terephthalonitrile, anhydrous ferric chloride and conductive carbon black, grinding, packaging in an ampoule tube in vacuum, heating to 250-350 DEG C in a muffle furnace at the speed of 5 DEG C / min, preserving heat for 20 hours, taking out a reactant, fully grinding, transferring into a tube furnace, heating to 250-350 DEG C at the speed of 5 DEG C / min, and cooling to room temperature to obtain the iron-based triazine ring polymer catalyst. And heating to 850-950 DEG C at the speed of 5 DEG C / min in a nitrogen atmosphere, preserving heat for 2 hours, carrying out acid leaching on the reactant by 0.5 mol / L hydrochloric acid at 55-65 DEG C for 6 hours, washing and drying, transferring into a tubular furnace, heating to 850-950 DEG C at the speed of 5 DEG C / min in the nitrogen atmosphere, and preserving heat for 2 hours, thereby obtaining the high-purity silicon carbide. Compared with a traditional method, the method has the advantages that the covalent triazine ring is directly doped into a metal monatomic active site during synthesis, the catalyst does not need to be modified subsequently, the activity of the iron-based triazine ring polymer catalyst prepared by the method in an acidic electrolyte is greatly improved, and the iron-based triazine ring polymer catalyst shows good oxygen reduction stability.

The invention discloses a preparation method and application of a Zn / Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth. The preparation method comprises the following steps: stirring a methanol dispersion of 2-methylimidazole zinc salt and a methanol dispersion of zinc nitrate hexahydrate, graphene oxide and cobalt acetylacetonate (III) at room temperature to obtain a mixture; carrying out centrifugation, methanol washing and drying treatment, carrying out high-temperature calcination under the protection of inert gas, and cooling to room temperature; and soaking the product in acid, washing for multiple times, and drying to obtain the target product Zn / Co-N-C carbon nanotube oxygen reduction catalyst. The carbon nanotube oxygen reduction catalyst prepared by the invention has a hierarchical porous property, and shows excellent oxygen reduction activity, cycling stability and methanol tolerance in both alkaline and acidic electrolytes. When the prepared carbon nanotube oxygen reduction catalyst is applied to a cathode of a zinc air battery, good power density and satisfactory cycling stability are shown.

The invention discloses a high-activity methanol-resistance direct methanol fuel cell cathode catalyst and a preparation method thereof. The activity composition of the catalyst is Cu / PtM, the carrier is a carbon nanotube, wherein, PtM is used for improving oxygen reduction activation and Cu is used for improving methanol-resistance performance. The preparation method is as follows: firstly, the carbon nanotube, the compounds of metal M, and platinic chloride solution are scattered in glycol ultrasonically, the pH value is adjusted, the temperature is increased and reflux is carried out, platinum based catalyst loaded by the carbon nanotube is prepared by filtering, washing and drying; then the prepared platinum based catalyst loaded by the carbon nanotube is scattered in the glycol and is added with copper sulfate, then the pH value is adjusted, the temperature is increased and the reflux is carried out, and then the platinum direct methanol fuel cell cathode catalyst loaded by the carbon nanotube coated with Cu is prepared by the filtering, washing and drying. The preparation method is simple, operational condition is mild and the controllability is good; besides, the catalyst prepared by the method has high oxygen reduction activation and good methanol-resistance performance.

The invention discloses a preparation method of a carrier metal iridium surface platinum-modified bi-functional oxygen electrode catalyst. Metal iridium serving as a carrier has an oxygen evolution function, and precious metal-induced metal ions are subjected to a reduction reaction to modify the precious metal platinum having a catalytic oxygen reduction function. Since the metal iridium has excellent oxygen evolution activity, the metal platinum has excellent oxygen reduction activity. The catalyst can be applied to an oxygen electrode of an integrated regenerative fuel cell. Compared with asimple commercialized catalyst, namely a mechanical mixture of iridium black and platinum black, the bi-functional oxygen electrode catalyst disclosed by the invention has the advantage that the oxygen reduction performance can be obviously improved while not sacrificing oxygen precipitation activity. In addition, according to the method disclosed by the invention, no organic reagent is used, sothe catalyst is very environment-friendly and meets the green development requirement.

The invention relates to a super-dispersion non-noble metal nitrogen-doped MOF double-effect electrocatalyst and a preparation method thereof. The preparation method comprises the following steps of 1) adding a hydroxyl-rich carbon source organic matter and a nitrogen-rich organic matter into a surfactant dispersed solution, and carrying out stirring and mixing; and enabling the carbon-nitrogen source organic matters to be reacted in the solution to obtain a primary precursor; 2) adding a transition metal solution, stirring at a constant temperature and sufficiently chelating with the organicprecursor; 3) putting the object obtained in the step 2) into a high-temperature kettle to carry out hydrothermal crystallization to promote crystals to grow slowly; 4) carrying out centrifuging, washing and drying on the object obtained in the step 3); and 5) carrying out high-temperature carbonization on the object obtained in the step 4) to obtain the catalyst. The catalyst has the advantages that the uniformly dispersed ultrafine metal nanoparticles are embedded and wrapped in a carbon shell, and the carbon layer structure is activated; and the catalyst has rich transition metals and nitrogen-bonded M-N chelating active sites, so that the catalyst stably exists in an acid solution, and has important application value and significance in the fields of fuel cells, water electrolysis andother electro-catalysis.

The invention discloses a preparation method of a transition metal oxide nitrogen and phosphorus doped catalyst applied to a zinc-air battery, which specifically comprises the following steps: a supramolecular compound formed by coordinating acetate containing M metal ions and phytic acid, The transition metal supramolecular compound is used as the precursor for high-temperature calcination under an inert atmosphere, and finally ammonia gas is used as the N source, and N doping is carried out at high temperature to obtain the final transition metal oxyphosphorus nitride. Transition metal oxyphosphorus nitride as an oxygen reduction catalyst can effectively reduce the overpotential of ORR, and the ORR process is shown to be a 4-electron catalytic mechanism by rotating disk electrode (RDE) and rotating ring disk electrode (RRDE), which is an ideal ORR reaction. process. The electrocatalyst fully utilizes the synergistic effect of transition metals and heteroatom elements in electrocatalysis, and exhibits excellent catalytic performance in the application of zinc-air batteries.

The invention belongs to the technical field of fuel cells and electrochemical catalysis, and in particular relates to a high-performance ultrafine low-Pt core-shell catalyst prepared by an organic reduction method and a preparation method thereof. The invention provides a noble metal alloy core-shell catalyst, which has a carbon atomic percentage of 90-96 at.%, an O element atomic percentage of 2-7% at.%, a surface Pt loading of 0.1-2 at.%, and a metal particle size of 0.5-5nm. . The invention prepares a low-platinum-shell-core alloy catalyst by controlling the reduction of organic carboxyl and hydroxyl reducing agents, and exhibits excellent oxygen reduction activity and electrocatalytic performance under acidic conditions.

The invention provides a high-activity Pt / C catalyst preparation method, which comprises: (1) dissolving a metal oxide precursor in an organic solvent, adding a carbon carrier, uniformly mixing, evaporating the solvent, drying, grinding into powder, and sintering to obtain a carbon-loaded metal oxide; (2) uniformly mixing the carbon-loaded metal oxide obtained in the step (1) with an alcohol solution to obtain a mixed solution; (3) dropwise adding an alcoholic solution of a water-soluble platinum salt, and uniformly mixing; and (4) after dropwise adding is completed, continuously heating and keeping for 10-60 minutes, cooling to normal temperature, separating, washing and drying to obtain the high-activity Pt / C catalyst. The Pt / C catalyst is synthesized under the assistance of the metal oxide, the operation is simple, the synthesis time is short, and the production efficiency is improved; alcohol is adopted as a solvent for reduction, the reduction temperature is low, and environment friendliness is achieved; the catalyst is washed by using a mixed solution of a volatile organic solvent and deionized water, so that the drying temperature is reduced, the drying time is shortened, and the stability of the catalyst is favorably improved.

The invention relates to a cathode non-platinum catalyst of a proton exchange membrane fuel cell and a preparation method thereof. The method comprises the following steps: melamine-formaldehyde resin preparation reaction is carried out, and metal salt is added into the melamine formaldehyde resin; complexing reaction occurs between the melamine formaldehyde resin and the metal salt to form a complex; and after solvent of the complex is evaporated, the complex is decomposed by heat treatment to form the cathode non-platinum catalyst with a hollow spherical structure of the proton exchange membrane fuel cell. The non-platinum catalyst has following advantages that firstly the non-platinum catalyst has a large activity ratio surface, so that the oxygen reduction activity of a catalyst is greatly improved; secondly the catalyst has a rich nitrogen source; thirdly the catalyst has an excellent activity of oxygen reduction; and fourthly the preparation method of the non-platinum catalyst is simple, and cheap metals such as Fe, Co and the like are used as the catalyst, so that the synthesis cost is lowered.

The present invention provides a high-density Fe-N 4 The invention discloses a preparation method and application of an active site oxygen reduction electrocatalyst, belonging to the field of polymer electrolyte membrane fuel cell catalysts. The metal zirconium salt is evenly dispersed in the solvent, wherein, Zr in the zirconium salt 4+ The concentration in the solvent is 2-8mg / ml, add two kinds of macrocyclic compounds including macrocyclic compound Ⅰ, metal macrocyclic compound Ⅱ and organic acid, under the condition of 20-40℃, ultrasonic treatment for 10-30min, at 120℃ React for 8-12 hours, filter with suction, wash until the filtrate is colorless, dry, and pyrolyze at 600-900°C for 1-2 hours to obtain high-density Fe-N 4 Active-site oxygen reduction electrocatalysts. The invention is simple to operate, easy to control, and environmentally friendly, and the prepared high-density Fe-N 4 Active-site oxygen-reducing electrocatalysts with excellent oxygen-reduction activity can be used in polymer electrolyte membrane fuel cells.

The preparation method comprises the following steps: (1) adding a pyridine ring nitrogen-containing transition metal ligand into a solution, stirring until the pyridine ring nitrogen-containing transition metal ligand is completely dissolved, adding a diamino heterocyclic compound until the diamino heterocyclic compound is completely dissolved, and adding a metal salt solution into the previous solution for polymerization reaction; (2) adding sodium chloride metal salt, mixing, ball-milling and drying; (3) introducing protective gas, heating, cooling, and carrying out first heat treatment; (4) acid pickling, suction filtration, water cleaning and drying, and (5) secondary heat treatment which is the same as the step (3) to obtain the non-noble metal oxygen reduction catalyst. The non-noble metal monatomic oxygen reduction catalyst prepared by the method disclosed by the invention has good oxygen reduction activity in 1.0 M potassium hydroxide, the peak potential is only 1.03 V, the half-wave point reaches 0.9 V in 3mA cm < 2 >, and the half-wave is 0.8 V in a 0.5 M sulfuric acid solution.

The present specification relates to a fuel cell and a method for manufacturing the same.

The invention provides an electrocatalyst for a fuel cell and a preparation method of the electrocatalyst. The electrocatalyst is prepared from the following raw materials in parts by mass: 1 part of folic acid and 3-7 parts of ferric trichloride. The preparation method comprises the steps of S1, mixing folic acid and ferric trichloride according to a mass ratio of 1: 3-1: 7; S2, annealing the mixture obtained in the step S1 for 6 hours; S3, washing a product obtained after annealing in the S2 is completed; and S4, drying the product washed in the step S3 to obtain the electrocatalyst. Folic acid is adopted as a main raw material, the carbon material electrocatalyst doped with a large amount of nitrogen elements is obtained through high-temperature pyrolysis, and the electrocatalyst is high in catalytic activity, low in cost, simple in process and suitable for commercial production.