98results about How to "High electrochemical catalytic activity" patented technology

Disclosed is a method for producing an electrode material for fuel cells, which electrode material has excellent electrochemical catalytic activity and uses a non-carbon conductive oxide carrier having high durability. Specifically disclosed is a method for producing an electrode material for fuel cells, which comprises the following steps. (1) A step wherein carriers mainly composed of tin oxide are dispersed in a solution containing a noble metal colloid, and the noble metal colloid is reduced so that the carriers are loaded with noble metal particles (2) A step wherein the carriers loaded with the noble metal particles are separated from the liquid and dried (3) A step wherein the dried carriers loaded with the noble metal particles are subjected to a heat treatment at a temperature of not less than 80° C. but not more than 250° C. in the presence of a reducing gas

The invention discloses a ZIF-8@FeMOF derived Fe-N codoped carbon material, and a preparation method and an application of the material. The preparation method comprises the steps of 1) performing a contact reaction on FeMOF, a zinc source, 2-methylimidazole and a surfactant in a solvent to prepare ZIF-8@FeMOF, and 2) performing calcination on ZIF-8@FeMOF to prepare the ZIF-8@FeMOF derived Fe-N codoped carbon material, wherein FeMOF is a metal-organic framework material which consists of Fe<3+> and an organic ligand and has a reticular structure; and ZIF-8 is a zeolite imidazate framework material obtained by a reaction of Zn<2+> and 2-methylimidazole. The ZIF-8@FeMOF derived Fe-N codoped carbon material has a loose porous structure and many active sites, and can efficiently catalyze a cathodic oxygen reduction reaction of a fuel cell; and the preparation method has the advantages of greenness, cleanness, high efficiency, simplicity, low cost and the like.

The invention relates to an apparatus and a method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry. In the method, a mono-metal or double-metal electrode having a nano-scale surface or an air cathode having advanced pollutant oxidation function is formed for reducing and degrading organic pollutants, then the formed electrode is used as a cathode in the electric repairing apparatus; a direct-current electric field is applied to a medium to migrate the organic pollutants in the medium to the cathode, thus achieving cooperation of electric field driven pollutant migration and in-situ electrode electrochemical degradation. The method avoids complex engineering problems, such as secondary treatment after extraction of a cathode solution, extra addition of a redox agent, arrangement of PRB and the like, during a conventional electric repairing process, and can significantly reduce engineering work load and repairing cost in the electricrepairing. The invention provides the in-situ repairing method for the polluted soil and underwater, which is simple in preparation, is low in cost and has high-effective cooperation.

The invention discloses a preparation method and an electrochemical catalysis application of a metal nanoparticle-foamy carbon catalyst. The preparation method comprises the following steps: (1) a polymerizable vinyl monomer is adopted as an oil phase, a metal precursor-containing water solution is adopted as a water phase, functional polymer nanoparticles are adopted as an emulsifier, and a stable high-internal-phase Pickering emulsion is prepared; (2) the oil phase is polymerized and the internal phase is removed with a radical polymerization method, such that a polymerized high-internal-phase foam material is obtained; (3) the metal ion precursor in the polymerized high-internal-phase foam is reduced into metal nanoparticles, such that a metal nanoparticle-polymer form hybrid material is obtained; (4) high-temperature calcination is further carried out under a nitrogen atmosphere, such that a metal nanoparticle-foamy carbon hybrid material is obtained; and (5) the above material is loaded on a clean glassy carbon electrode, and electrochemical catalytic application can be carried out. The metal nanoparticle-foamy carbon catalyst preparation method has the advantages of simple process and low equipment requirement. The obtained material has good conductivity and large specific surface area. The material has a good catalytic effect in the aspect of electrochemistry.

The invention discloses a cobalt complex and a preparation method thereof, and the cobalt complex is characterized by having good electrocatalytic activity on hydrogen peroxide, the molecular formula of the cobalt complex is C26H26N4O10Co, the crystal system is orthorhombic, the space group is Pbcn, the cell parameters alpha, gamma and beta satisfy: a=15.928Angstrom, b=10.602Angstrom, c=15.596Angstrom, alpha is equal to gamma, is equal to beta and is equal to 90 degrees. The cobalt complex prepared in the invention is obtained by a mixing reaction of a cobalt salt and a derivative of 5-aminosalicylic acid, namely, 5-((2-pyridyl) methylene amino)-2-hydroxybenzoic acid according to a certain proportion, the cobalt complex has a specific spatial structure and an accurate molecular formula, the synthesis steps are simple, the yield can reach 45-70%, and the cobalt complex has good electrocatalytic activity, thereby being capable of being used as an electrocatalytic active material having a potential application prospect.

The invention discloses a copper complex and a preparation method thereof, and the copper complex is characterized by having good electrocatalytic activity on hydrogen peroxide, the molecular formula of the copper complex is C46H34N6O14Cu2, the crystal system is clinorhomboidal, the space group is P-1, the cell parameters are as follows: alpha is equal to 99.90 degrees, beta is equal to 101.2 degrees and gamma is equal to 93.69 degrees. The copper complex is prepared from a mixing reaction of a copper salt, 5-(di(carboxymethyl) amino)-2-hydroxybenzoic acid and 1,10-phenanthroline according to a certain proportion, the copper complex has a specific spatial structure and an accurate molecular formula, the synthesis steps are simple, and the yield can reach 30-70%. The copper complex prepared in the invention has good electrocatalytic activity, thereby having a broad application prospect of being used as a potential electrocatalytic active material.

The invention discloses a preparation method of a silica-modified multi-spherical-cavity carbon material and application of the carbon material to a fuel cell membrane electrode. According to the method, a silica bead is used as a template, aniline is polymerized around the bead, the silica bead is carbonized and etched in sequence, and the nitrogen-doped silica-modified multi-spherical-cavity carbon material is obtained. The size of spherical cavities of the multi-spherical-cavity carbon material is controllable, meanwhile the multi-spherical-cavity carbon material has certain oxygen reduction electrochemical activity, and therefore the carbon material can serve as a material relevant to electro-catalysis. Besides, silica modification enables the multi-spherical-cavity carbon material to have self-humidifying performance. A catalyst prepared from the silica-multi-spherical-cavity carbon material which serves as a carrier carrying Pt is high in electro-catalytic property, good in performance and stability under low humidity and long in service life and is an ideal choice for a fuel cell anode catalyst. It is indicated that the silica-multi-spherical-cavity carbon material can serve as the carrier material of the fuel cell anode catalyst and the material relevant to self-humidifying of the membrane electrode.

The invention discloses a compound with electrochemical response to formaldehyde and a preparation method thereof. The cobalt complex electrocatalytic material is a 4,4'-dipyridine sulfadiazine cobalt compound with certain space structure, and the molecular formula is C40H34CoN12O4S2. The preparation method of the sulfadiazine cobalt compound electrocatalytic material is implemented by carrying out chemical reaction on sulfadiazine with conjugated extended pai bond and 4,4'-dipyridine to obtain the novel cobalt compound. The compound used as an electrocatalytic active material has accurate space structure and accurate molecular formula; the cobalt ions can form stable coordinate bonds with the ligand by utilizing 3d orbit, thereby being beneficial to the transfer of electrons and promoting the proceeding of the electrochemical reaction, and thus, the compound has favorable electrocatalytic activity for formaldehyde. The cobalt complex used as the electrocatalytic active material has wide application prospects.

The invention discloses a Pd-based composite nano particle and a preparation method thereof. The preparation method comprises the following steps that a mixed solution containing copper salt and a stabilizing agent is prepared; after the mixed solution is stirred for five to ten minutes at an indoor temperature, a reducing agent is added according to the fact that the molar ratio of the reducing agent and copper ions is 1-100:1, after complete reaction, a palladium chloride solution is added according to the fact that the molar ratio of palladium chloride and the copper salt is 1:5-50, and stirring continues at the indoor temperature until complete reaction is achieved; the reaction solution is filtered, then filter slag is kept, and a Cu2O nano particle modified by Pd is obtained after the filter slag is washed and dried. According to the Cu2O nano particle modified by the Pd, the Pd is deposited on the surface of the Cu2O nano particle with a mesoporous structure, so that the electron and mass transmission of the Cu2O nano particle modified by the Pd is improved, the reactivity site of electrocatalysis is improved, and the Cu2O nano particle modified by the Pd has higher electrocatalysis performance compared with simple metallic oxide nano materials.

The invention relates to a novel preparation method of an edge functionalized graphene catalyst. Mixed ball milling is carried out on graphite powder and conductive polymer monomer (such as pyrrole) at room temperature and normal pressure without adding any other chemical reagents, and ball milling is carried out continuously to obtain edge functionalized graphene nanosheet of the conductive polymer at the ball milling speed 25% lower than that reported previously and with ball milling time saved by 50%. The product is uniform in sheet, has the thickness being about 1.5 nanometers and the yield being 90% above, batch production of graphene can be effectively realized, the commercial cost is lowered, and the application universalness of graphene is popularized. The prepared product contains 6% of nitrogen atoms, provides effective active site for electrochemistry oxygen reduction, and can be directly used as an oxygen reduction catalyst with high performance. In the overall production process, toxic chemical reagent or high temperature and high pressure is not used. The preparation method is high in safety and environmental protection, simple in technological process and easy to operate.

The invention discloses a nitrogen-doped graphene hollow sphere catalyst and a preparation method and application thereof. The nitrogen-doped graphene hollow sphere catalyst is formed by loading carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS) serving as a carrier, transition metal and transition metal oxide on the surfaces of the carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); the preparation method comprises the following steps: preparing carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); and growing the transition metal/oxide nanoparticles on the surface of CNx-NGHS to prepare CNx-NGHS-loaded transition metal/oxide nanoparticles. The application of the nitrogen-doped graphene hollow sphere negative catalyst in catalyzing an oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER) of a rechargeable zinc-air battery can significantly enhance the O2 molecular adsorption efficiency, improve the stability and the conductivity, and improve the stability and the electrical conductivity of the battery. The material has relatively low overpotential in ORR and OER reactions, and can meet the requirements of commercial application.

The invention relates to application for nitrogen-doped graphene used as a catalyst in removal of SO2 through an electrooxidation method. The nitrogen-doped graphene is prepared through the following steps: dissolving a carbon contained precursor and a carbon and nitrogen contained precursor in water, then subjecting the obtained mixture to drying under heating until a solid is obtained, and subjecting the above-mentioned solid to high-temperature calcination in a nitrogen or argon atmosphere so as to obtain the nitrogen-doped graphene. The nitrogen-doped graphene provided by the invention has simple preparation process, can be obtained through a solid-phase reaction at normal pressure and high temperature, uses common equipment, is low in preparation cost, facilitates to industrial production, shows excellent electrochemical catalytic activity when used as the catalyst for the electrooxidation reaction of SO2, and can be extensively applied in the field of electrochemical desulfurization and purification of air.

The invention discloses a cobalt complex with electrochemical catalytic activity and a preparation method thereof. The cobalt chemical combined electro-catalysis material is a cobalt complex with a certain spatial structure, the molecular formula of the cobalt complex is C3OH26CoN10O4S2. The preparation method of the cobalt complex chemical combined electro-catalysis material comprises the following steps: enabling sulfadiazine with conjugate big Phi bond, 2, 2'-dipyridyl and cobalt ions with electro-catalysis activity to be subjected to chemical reaction, so as to obtain the novel cobalt complex containing sulfadiazine and dipyridyl. According to the invention, the cobalt complex has electro-catalysis activity, accurate spatial structure and molecular formula; cobalt atoms can form a stable coordination bond with a ligand by using the empty d electronic orbit of the atoms, so as to facilitate electron to be transmitted, and further facilitate the proceeding of the electrochemical reaction; the prepared cobalt complex has good electro-catalysis activity, and has wide application prospects as an electro-catalysis active material.

The invention discloses a composite oxygen electrode used for a solid oxide electrolytic tank and a preparing method of the composite oxygen electrode. The composite oxygen electrode comprises an electrolyte layer, a substrate layer and active coating layers. The substrate layer is a BSCF-SDC composite porous material and covers the electrolyte layer. The active coating layers cover the outer surface of the BSCF-SDC composite porous material and the inner surfaces of pores. By means of the composite oxygen electrode, the BSCF-SDC composite porous material is adopted as the electrode body material, then the Ln2NiO4 active coating layers with good electric conductivity and CO2 tolerance are formed on the surface of the composite porous material and in the pores, and the electrochemical property and long-term stability of the composite oxygen electrode material are obviously improved.

The invention discloses a block type electrode material suitable for Electro-Fenton depredation of pollutants. The block type electrode material suitable for the Electro-Fenton depredation of the pollutants is a material with high 2-electron oxygen reduction selectivity, and has enhanced active hydrogen reduction capacity and Fenton activity, so that the mineralization efficiency of a heterogeneous E-Fenton system is improved, and the service life of an electrode is prolonged; and the electrode generates H2O2 in situ and decomposes H2O2 to.OH in situ. The electrode material is a PdFe nano-alloy carbon aerogel cathode, and a PdFe nano-alloy and an abundant defect carbon structure are formed in situ in a carbon aerogel skeleton. The invention further discloses a preparation method of the block type electrode material and application of the block type electrode material in degradation or removal of the pollutants. Compared with the prior art, the selectivity of the 2 electron ORR of the PdFe alloy carbon aerogel is increased to 80%, the reduction dehalogenation and oxidation capacity is enhanced, and the electrocatalytic activity is greatly enhanced, and the removal rate and the dehalogenation rate of TOC of 3-chlorophenol reach 100% in 6 hours. The block type electrode material suitable for Electro-Fenton depredation of the pollutants can be used for deep degradation of halogen-containing pollutants, provides the feasibility for complete mineralization and degradation of the 3-chlorophenol under mild conditions, and has a very broad application prospect in the actual sewage treatment.

The invention relates to a preparation method for a metal organic framework material-heme-based electrochemical sensor and an application thereof in the field of electrochemical sensors. The preparation method comprises the following steps: synthesizing MOFs first and then preparing an MOFs-heme nano compound; and then preparing a solution, dropwise coating the solution to a glass-carbon electrodeafter surface treatment, and airing the electrode to obtain the MOFs-heme modified electrode sensor. The sensor can be used for detecting content of hydrogen peroxide in water quantitively. The detection comprises the following steps: first, detecting and drawing a standard curve; and determining a current response value of a to-be-detected sample solution, and converting the content of hydrogenperoxide in the to-be-detected sample solution according to the standard curve. The sensor solves the problem that an independent heme modified electrode is easy to fall and polymerize, improves the catalytic activity and stability of the electrode and is low in cost and convenient to use. The sensor has a wide application prospect in the fields of environment protection, food safety, clinical medicine and the like.

The invention discloses a NiO/C@NiFeLDH composite material and a preparation method and application thereof. The preparation method comprises the following steps of:(1) calcining a Ni-MOF precursor inan inert atmosphere to obtain carbon-containing nickel oxide; (2) mixing and contacting the carbon-containing nickel oxide in a first solvent containing a surfactant to obtain functionalized carbon-containing nickel oxide; and (3) dispersing the functionalized carbon-containing nickel oxide, nickel salt, an iron source, urea and trisodium citrate in a second solvent, and then carrying out heatingreaction. The composite material can be used for an oxygen evolution reaction catalyst, has better electrochemical catalytic activity, has smaller over-potential compared with commercial RuO2, has lower Tafel slope than commercial RuO2, and is also cheaper. In addition, the preparation method is simple and easy to control, and has higher popularization and application value.

The present invention relates to a PCA-based gas detection apparatus and a PCA-based gas detection method, and belongs to the technical field of gas detection. The gas detection apparatus comprises azirconium-based sensor, a data collection and conversion device and a PCA analysis module, wherein the zirconium-based sensor has a single sensitive electrode. According to the present invention, thegas detection apparatus can simultaneously identify a plurality of gases, and has advantages of simple preparation process, small volume, and low cost.

The invention belongs to the technical field of batteries, and particularly discloses a nitrogen-doped defect-rich molybdenum disulfide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a precursor material by taking ammonium molybdate and thiourea as raw materials through a hydrothermal method, and then preparing a nitrogen-doped defect-rich molybdenum disulfide catalyst material N-MoS2 with a three-dimensional porous nano flower-shaped structure through subsequent heat treatment based on an atmosphere generated by urea decomposition. The invention provides a new way for efficient and controllable preparation of the heteroatom-doped molybdenum disulfide-based nano electrocatalyst material.

The invention discloses a hollow CeO2 sphere@Co-N/C nanometer composite material and a preparation method and application thereof. The preparation method includes the steps that cerium salt and polydopamine nanoballs are in contact and react, and through air gradient calcination, hollow CeO2 balls are obtained; in a second solvent, the CeO2 balls, a cobalt source and D-(+)glucosamine hydrochlorideare subjected to contact reaction to be made into a CeO2sphere@Co-N/C precursor; the CeO2 sphere@Co-N/C precursor is calcined in a nitrogen atmosphere. The catalysis performance of the composite material is the same as that of Pt and Pt-based catalystsand is good, the cost of the catalysts can be reduced, and the composite material has stable oxygen reduction catalysis performance andmethanol resistance and can efficiently catalyze oxygen reduction reaction of a fuel cellcathode; the preparing method has the advantages of being environmentally friendly, clean, efficient, simple, low in cost and the like.

The invention relates to the field of electrode materials for vanadium redox batteries (VRB), in particular to a high-performance composite carbon felt, and solves the problems that the existing carbon felt electrode for the vanadium battery is poor in hydrophilicity, small in active area, low in electrochemical activity and conductivity, poor in vanadium ion electric catalytic performance, and low in single battery performance. The preparation method comprises the following steps: taking commercial carbon felt as a raw material, and using a method that a binder is used for binding to prepare the functionalized carbon tube composite carbon felt. The composite carbon felt prepared by the method disclosed by the invention has the advantages of good hydrophilicity, electrochemical catalysis performance, conductivity, chemical stability and single VRB performance. According to the invention, the product cost is low, industrialized production is facilitated, environment friendliness is achieved, and the high-performance composite carbon felt can be widely applied to the field of the vanadium redox batteries.