1048results about How to "Improve electrocatalytic performance" patented technology

The invention provides an electrode for electrolysis, a preparation method of the electrode and an electrolytic bath. The electrode for electrolysis comprises a conductive base material and an active coating, wherein the conductive base material is a base material containing titanium or titanium alloy; the active coating at least comprises a bottom coating layer and a surface coating layer; the bottom coating layer is prepared from titanic oxide, iridium oxide and ruthenium oxide; the surface coating layer is prepared from iridium oxide, ruthenium oxide, titanium oxide and a metal or an oxide of one of two of palladium and platinum. According to the electrode for electrolysis disclosed by the invention, the double coating layers are adopted; compared with the single coating layer only containing ruthenium, iridium and titanium, the electrode is better in activity, the chlorine evolution potential of the electrode is low, the oxygen evolution potential is high, the service life of the electrode is longer, and the electrolysis stability is better.

The invention relates to a layered duplex metal hydroxide composite structure electrocatalyst and a preparation method, belonging to the technical field of electrocatalysts. Ferrocobalt layered hydroxide, which takes foamed nickel as a base, serves as a working electrode, and a platinum wire and a silver/silver chloride electrode serve as a counter electrode and a reference electrode respectively.Weigh Ni(NO3)2.6H2O and FeSO4.7H2O in a beaker, add deionized water therein the beaker to form a solution A, and carry out magnetic stirring until complete dissolution; in an indoor temperature condition, the potential is from minus 1.2V to minus 0.8 V, and the solution A serves as electrolyte to perform constant potential deposition; take out the foamed nickel after the deposition, then wash cleanly by using the deionized water and absolute ethyl alcohol, and dry to obtain the layered duplex metal hydroxide composite structure electrocatalyst.

The invention discloses a method for synthesizing a PdPt/graphene nano electrical catalyst in one step by a microwave process, which comprises: dispersing graphene oxide in aqueous solution of quaternary ammonium salt surfactant through ultrasonic waves, adding solution of a soluble Pd II salt or PtII salt, fully and uniformly mixing, regulating the pH value of mixed solution, adding a reducer, uniformly mixing, reacting under radiation of microwaves to reduce palladium and platinum metal ions and graphene oxide, and cooling, washing and drying the reactants to obtain the PdPt/graphene nano electrical catalyst. The method has the characteristics of energy conservation, environmental protection, quickness, simple process and the like. The obtained PdPt/graphene nano electrical catalyst hasa high electric catalysis performance for the electrochemical oxidization of methanol.

The invention relates to an ultrathin nanosheet array electro-catalytic material with a nano-porous structure and oxygen vacancies. The material is a cobaltosic oxide primary nanosheet array which grows vertically on a conductive substrate and is doped with a metal; an ultrathin nanosheet with oxygen vacancies and nanopores is obtained on each primary nanosheet; the conductive substrate is a titanium sheet or a foamed nickel sheet, and the doped metal is zinc, nickel or manganese; and the thickness of each cobaltosic oxide ultrathin nanosheet doped with the metal is 1.22 nm, nanosheets are in a three-dimensional porous structure, and the nano-pore diameter is 3-6 nm. The ultrathin nanosheet array electro-catalytic material with the nano-porous structure and oxygen vacancies has the following advantages: the material can effectively reduce the overpotential and the spike potential of an oxygen evolution reaction, increase the conversion rate of a single cobalt atom and work continuously and stably in an alkali environment; the steps of a preparation method of the material are simple, the operation is convenient, the cost is low, and the material is environmental-friendly; and new ideas and strategies are provided for the function-oriented design and the performance optimization of an oxygen evolution catalyst of a water electrolysis system.

The invention provides a NiAl-laminated type bimetal hydroxide/carbon nano-tube compound electrode, a preparation method thereof, and an application of the electrode to the electro-catalytic oxidation of glucose. In the electrode, a glassy carbon electrode is taken as a substrate electrode and coated with a layer of film of a NiAl-laminated type bimetal hydroxide/carbon nano-tube compound. The preparation method comprises the following steps of: enabling laminated type bimetal hydroxide to grow in-situ on the surface of carbon nano-tubes by adopting a coprecipitation method to obtain the laminated type bimetal hydroxide/carbon nano-tube compound; then dispersing the compound into a water solution to prepare a solution; dispensing the solution on the surface of the clean glassy carbon electrode; drying at room temperature to volatilize the solvent and obtain the electrode modified by the laminated type bimetal hydroxide/carbon nano-tube compound. The electrode can be used for the electro-catalytic oxidation of the glucose under an alkaline condition and has favorable electro-catalysis performance and stability with simple synthesis method, low cost and wide application prospect.

The invention discloses an oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst and a preparation method and application thereof. The compound catalyst comprises N-P-codoped carbon layer coated Co2P nano rods and/or nano particles. The preparation method includes: evaporating and drying the solution of cobalt acetate, concentrated phosphoric acid and urea, and performing high-temperature treatment under protective atmosphere to obtain the compound catalyst. The preparation method has the advantages that the method is simple, low in cost and beneficial to industrial production; the prepared oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst is applicable to fuel cell and water decomposition, high in activity and good in stability, the catalytic performance of the compound catalyst is close to that of a commercial precious metal 20wt% Pt/C and RuO2 catalyst, and the compound catalyst is promising in application prospect.

The invention provides a nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst and a preparing method and application thereof. The preparing method includes the following steps that a coprecipitation method is used for preparing a SEP compound material from a surfactant and heteropolyacid or polyoxometalate, the surfactant is a cationic surfactant or ionic liquid surfactant, and the heteropolyacid or polyoxometalate contains molybdenum or tungsten; the SEP compound material, melamine and phytic acid are used as raw materials for synthesizing a SEP-MA-PA compound material through a mixing and dissolving method; under protection of inert gas, the SEP-MA-PA compound material is subjected to heat treatment and cooled to obtain the nitrogen-phosphorus codopedcarbon loaded molybdenum carbide or tungsten carbide catalyst. Nanoparticles of the nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst are small in size and areof a porous structure, by means of nitrogen-phosphorus heteroatom doping, the conductivity of the catalyst is enhanced, and the catalyst has efficient performance of electrolyzing water for preparinghydrogen.

The invention relates to a cobalt sulfide/layered double metal hydroxide composite electrocatalyst and a preparation method thereof, and belongs to the technical field of electrocatalysts. Co9S8/NF with a good stability and a good conductivity is used as a precursor, and nanosheets with a high specific surface area and uniform composition are loaded on the surface of the precursor in a compoundingmanner to prepare the cobalt sulfide/nickel-iron layered double metal hydroxide/ foamed nickel composite electrocatalyst. The prepared material can be used for electrocatalytic hydrogen evolution andoxygen evolution, has a good electrocatalytic performance, is of great significance to prepare, develop and apply the cobalt sulfide/layered double metal hydroxide composite electrocatalyst, and hasa broad application prospect in fields of electrocatalytic hydrogen evolution and oxygen evolution.

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of a bismuth-base catalyst/carbon nanofiber combination electrode for an all-vanadium redox flow battery. Firstly, spinning solution required for an experiment is prepared and then bismuth salt and the spinning solution are uniformly mixed. According to an electrostatic spinning method, a required nanofiber film is prepared and then the nanofiber film is pre-oxidized in the air and is carbonized in an inert atmosphere tube furnace so as to obtain the required bismuth-base electrocatalyst/carbon nanofiber combination electrode. After the obtained electrode material is cleaned and dried, testing of related electrochemical performance representation and charge-discharge properties can be carried out on the electrode material. The carbon fiber diameter, which is prepared according to the preparation method, is in the nano class; compared with a specific surface area of a conventionally used electrode material, the specific surface area of the bismuth-base catalyst/carbon nanofiber combination electrode is greatly increased. Moreover, the carbon nanofibers are compounded with a high-activity bismuth-base electrocatalyst, and thus, electrochemical activity of the electrode can be greatly improved, so that energy efficiency of the all-vanadium redox flow battery is greatly improved.

The invention belongs to the field of electrocatalysts, and specifically relates to a preparation method and application of a mesoporous bi-metal phosphide electrocatalyst for electrochemically decomposing water to generate hydrogen with high performance. A hydroxide precursor is synthesized through hydrothermal reaction and is further subjected to low-temperature phosphating reaction to obtain aNixMn1P porous nanosheet array electrocatalyst. The series of bi-metal phosphides have relatively low charge transfer resistance and reaction barrier of hydrogen evolution reaction, and have excellentperformances in electro-catalytic hydrogen evolution reaction. The catalyst is low in cost, is simple and convenient in operation, is simple in process, is excellent in catalysis performance, and provides basic application research, in the electro-catalysis field, of the materials.

The invention discloses a loaded multifunctional catalysis composite material, a preparation method thereof and an application of the composite material to catalytic removal of water pollutants. The preparation method includes the steps: preparing a zinc oxide nano-sheet loaded nickel foam (Ni@ZnO) composite material by an electro-deposition method; compounding molybdenum disulfide micro-nano particles on ZnO porous nano-sheets by an electro-deposition method to obtain Ni@ZnO/MoS₂. The composite material Ni@ZnO/MoS₂ combines the advantages of components such as nickel foam, the zinc oxide nano-sheets and molybdenum disulfide from the point of material performances, high catalytic degradation activity and recycled performances are achieved, photo-catalysis and electro-catalysis are combined from the point of material application, and the catalytic activity of the composite material is improved by the aid of synergistic effects of photo-catalysis and electro-catalysis.

The invention discloses a preparation method of an alkali oxygen evolution reaction electrocatalyst. The preparation method comprises the following steps: firstly, carrying out ultrasonic cleaning on a conductive substrate, then preparing aqueous solution with soluble cobalt salt, soluble manganese salt, ammonium fluoride and urea, and in a reaction kettle, vertically growing a manganese cobalt subcarbonate nano array multilevel structure on the surface of the substrate; then preparing aqueous solution with soluble alkali and a reducing agent, carrying out secondary treatment, and carrying out structure and performance optimization on the manganese cobalt subcarbonate nano array multilevel structure; finally, in a tube furnace, in nitrogen or argon atmosphere, carrying out calcination at a temperature of 200 to 1,000 DEG C to prepare the alkali oxygen evolution reaction electrocatalyst with a manganese-doped cobalt oxide nano array multilevel structure. The preparation method disclosed by the invention adopts a simple hydro-thermal synthesis/calcination treatment method, is simple in process and is easy to regulate and control; the prepared product is excellent in performance and is an electrocatalyst with wide prospect in the application process of alkali water decomposition.

The invention relates to a preparation method of three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres, and relates to the technical field of multi-level structured nano-grade catalyst materials. First, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are adopted as a nickel source and a cobalt source, a deionized water-isopropanol mixed phase with a proper proportion is adopted as a solvent, methanol is adopted as a reactant, and no additional base precipitating agent is adopted; a three-dimensional flower-shaped nano-sheet microsphere precursor is prepared in a Ni<2+>-Co<2+>-NH3-NH4<+>-SG<n->-H2O-IPA-CH3OH system (SG<n-> is CO3<2-> or HCOO<->); the temperature is increased to 300-400 DEG C in an air atmosphere with a speed of 1 DEG C/min, and the precursor is calcined for 2-3h, such that the three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are obtained. According to the invention, co-precipitation of the formulated cobalt and nickel in the raw materials is realized. The prepared three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are spinel cubic phases with high purity, and are formed by ultrathin nano-sheet self-assembly. The microspheres comprise rich mesopores, and have a large specific surface area. The method has the advantages of simple operation, appropriate conditions and easy control.

The invention discloses a synthesis method of a zinc oxide nano wire harness array/foam graphene composite material and an application thereof, relating to a synthesis method of a composite material and an application thereof. The invention aims at solving the technical problems of low sensitivity and relatively high detection limit by applying the existing zinc oxide nano wire/foam graphene composite material to dopamine detection. The synthesis method comprises a chemical vapor deposition method and a hydrothermal synthesis method. The zinc oxide nano wire harness array/foam graphene composite material can be used as an electrode material to detect dopamine. The synthesis method disclosed by the invention is mainly used for synthesizing a zinc oxide nano wire harness array/foam graphene composite material.

The invention belongs to the field of nanomaterials, and discloses a nickel-cobalt bimetallic phosphide electrocatalyst as well as a synthesis method and an application thereof. The Prussian blue analogue precursor synthesized through simple aging reaction is further subjected to low-temperature phosphating reaction, and a NiCoP multi-hollow porous nanocube electrocatalyst is obtained. The seriesof bimetallic phosphides have lower charge transfer resistance and reaction barrier for oxygen evolution reaction, and have superior performance in electrocatalytic oxygen evolution reaction. Besides,the catalyst is low in cost and convenient to operate, adopts a simple process and has superior catalytic performance, and basic application research is provided for the materials in the field of electrocatalysis.

The invention provides a titanium nitride carrier or a mixed carrier of titanium nitride and charcoal carrier for the catalyst of the proton exchange membrane fuel cell, and is characterized in that the carrier comprises the titanium nitride or the mixture of titanium nitride and charcoal carrier; wherein, the charcoal carrier is one or more of activated carbon, carbon nanotube, carbon molecular sieve and carboform; the titanium nitride accounts for 1-100% of the gross mass of the carrier. More particularly, the carrier is made by the following steps: (1) a precious metal chemical complex is added into a suspension of titanium nitride or a suspension of a mixture of titanium nitride and charcoal carrier; wherein, the amount of the precious metal added into the suspension accounts for 1-90% of the gross mass of the suspension; then the mixture A is obtained after being mixed evenly; (2) excess reducer solution is added into A, so that the metal salt particulates are restored and adsorbed on the carrier; and then B is obtained; (3) after B is filtered, washed and dried, the catalyst loaded on the titanium nitride carrier or the compound carrier of titanium nitride and charcoal is obtained; wherein, the particle size of the precious metal is 1-20nm. Being used in the electro-catalyzed reduction of methanol, methanoic acid and the mixed gas of H2 and CO, the catalyst loaded on the carrier shows very high catalysis performance.

The invention provides a novel type coating titanium anode, which comprises titanium substrate and anodic active coating. The novel type coating titanium anode is characterized in that: the coating has the three layers of the sandwich type structure, namely, an inner layer coating, a core layer coating and an outer layer coating, wherein the inner layer coating and the outer layer coating are both iridium-tantalum oxide coating, the core layer coating is ruthenium-titanium oxide coating. The novel type coating titanium anode of the invention is a coating which is introduced with the iridium-tantalum oxide coating and the ruthenium-titanium oxide coating, since the hierarchical structure of the sandwich, the preponderances of the chlorine evolution and the oxygen evolution aspects are kept and the corrosion resisting property is good, thereby, the novel type coating titanium anode can proceed electrolysis in acidity salt solution, method for preparing the novel type coating titanium anode is easy, and raw material of the novel type coating titanium anode is easy to obtain.

The invention provides a titanium-based composite anode as well as a preparation method and application of the titanium-based composite anode. The titanium-based composite anode comprises a titanium substrate, a double-dense protection intermediate layer and an active surface layer, wherein the double-dense protection intermediate layer is divided into two layers including a titanium dioxide nanotube layer and an antimony-tin oxide dense layer; a honeycomb-shaped antimony-tin oxide layer also covers the antimony-tin oxide dense layer. An electrode is long in service life, high in electrocatalytic activity and relatively high in efficiency of oxygenolysis of organic matters in sewage treatment, and can be applied to sewage treatment and chlor-alkali industry.