390results about How to "Improve catalytic ability" patented technology

The invention discloses magnetic sludge biochar, a preparation method therefor and an application of the magnetic sludge biochar and belongs to the technical field of preparation of biochar. The preparation method comprises the steps of dewatering sludge of a sewage treatment plant, then, carrying out pyrolysis by adopting a high-temperature tubular furnace, and then, carrying out sieving, therebyobtaining the magnetic sludge biochar. According to the application, the biochar is used for catalytically degrading refractory organic pollutants. According to the method, the sludge serves as a preparation raw material of the biochar, thus, the preparation cost is reduced, the problem in how to efficiently utilize the sludge is effectively solved, and thus, the method has good environmental andeconomic benefits. The biochar material prepared by the method is environmentally friendly, efficient and cheap and can be applied to the fields of activated degradation of organic pollutants and thelike by persulfate.

The invention discloses a PCB copper-containing wastewater treatment method with autocatalytic oxidation as a core. According to the method, acid copper-containing wastewater is used for regulating pH of alkali copper complex wastewater to be nearly neutral or neutral, zero-valent iron is used for reducing copper ion part in wastewater into new elemental copper which is beneficial for following Fenton reaction, under concerted catalysis action of divalent iron and new elemental copper, high-efficiency Fenton reaction is realized under neutral condition so as to break complex, and then, zero-valent iron is used for reduction to recycle copper ions in wastewater, divalent iron and ferric ions in effluent are removed by an alkali regulation precipitation method, meanwhile, under the effects of flocculation and adsorption of ferric hydroxides, pollutants in water are further removed, copper ion concentration is less than 0.5mg / L and iron ion concentration is less than 10mg / L in final effluent, and biodegradability is good. The method fully uses the copper existing in the system and makes use of catalytic effect of copper while removing the copper, dosage of acid and alkali is remarkably reduced, and salt content of effluent is reduced, and the method has an industrial application value.

The invention discloses catalyst for removing NOx in incineration gas. The catalyst takes carbon nano tubes and titanium dioxide as carriers and takes manganese oxide and cerium oxide as binary active ingredients. The preparation method can be a sol gel method, a solvothermal method or a coprecipitation method. The catalyst of the invention takes both the carbon nano tubes and the TiO2 as the carriers, the excellent adsorption property of CNTs and the large specific surface area are utilized, the advantages of the TiO2 as traditional carriers are combined and the nontoxic and pollution-free MnOx and CeOx as the binary active ingredients, so the absorption function of the CNTs and the catalytic action of the MnOx and CeOx cooperate with each other, the operating temperature of the selective catalytic reaction is reduced and the NOx removal rate can reach 99.5 percent under 125 DEG C. The catalyst can be used to remove NOx atmospheric pollutants emitted in the high-temperature processes of the coal-fired power plants, the metallurgical industry, the waste incineration and the like.

The invention relates to a photocatalytic self-cleaning nano-titania porcelain enamel substrate and a method for preparing the same. Raw materials comprise the following chemical compositions in percentage by weight: 35.0 to 68.0 percent of SiO2, 0.5 to 3.0 percent of Al2O3, 10.0 to 20.0 percent of B2O3, 12.0 to 20.0 percent of TiO2, 1.0 to 5.0 percent of K2O, 5.0 to 12.0 percent of Na2O, 3.0 to 8.0 percent of SiF6 and 1.0 to 3.0 percent of P2O5. The preparation method comprises that: the raw materials are mixed, melted, quenched and dried to prepare a porcelain enamel melted block; the porcelain enamel melted block, nano-titania, and the like are mixed, ground and sifted to obtain porcelain enamel; a steel plate which is subjected to derusting treatment is coated with the porcelain enamel so as to obtain the photocatalytic self-cleaning nano-titania porcelain enamel substrate with excellent photocatalytic performance and chemical stability; and the photocatalytic self-cleaning nano-titania porcelain enamel substrate has a simple preparation process and low production cost.

The invention discloses a positive electrode material used for lithium ion batteries. The positive electrode material comprises a main body material and an interface modification object on the surfaceof the main body material, wherein the main body material is a lithium-containing transition metal oxide LixMyN(1-y)O(2-alpha)A(beta); the interface modification object on the surface of the main body material is alkaline earth metal silicate DaR<b+>2(1-a) / bO.zSicT(1-c)O(2-lambda)E(zeta), wherein x is greater than or equal to 0.8 and smaller than or equal to 1.3, y is greater than or equal to 0.6and smaller than or equal to 1.0, alpha is greater than or equal to 0 and smaller than or equal to 0.2, beta is greater than or equal to 0 and smaller than or equal to 0.4, a is greater than or equalto 0.3 and smaller than or equal to 1.0, c is greater than or equal to 0.3 and smaller than or equal to 1.0, z is greater than or equal to 0.1 and smaller than or equal to 20, lambda is greater thanor equal to 0 and smaller than or equal to 0.5, zeta is greater than or equal to 0 and smaller than or equal to 0.5, and the numerical value of b is determined by the element variety and occupied position of R. The invention further discloses a preparation method of the positive electrode material used for lithium ion batteries. The positive electrode material used for lithium ion batteries disclosed by the invention solves the problems such as low high voltage tolerance, low cycle stability and low safety performance existing in an existing lithium ion battery.

The process of treating waste water containing metal complex includes: regulating pH value to 2-4 and adding H2O2, contacting with iron powder in a fluidized bed reactor to produce displacement reaction and complex eliminating reaction, adding alkali in a deposition tank one deposit metal ion, and separating supernatant and the lower precipitate. The process can prevent the aggregation and deactivation of iron powder in the reaction, and has greatly raised reaction efficiency, low cost and high waste water treating effect.

The invention relates to an adsorption material for treating phosphorus wastewater and use thereof. The adsorption material consists, by mass percent, of 50 to 70% of flyash zeolite and 30% to 50% of natural zeolite and is prepared by homogenously mixing the flyash zeolite with the natural zeolite based on the above proportion, the above resultant adsorption material is added, with the mass ratio of phosphorus to the adsorption material being 1: 100 to 200, to phosphorus wastewater with the pH from 3 to 10 and the phosphorus concentration from 0 to 150mg / l in order to treat the phosphorus wastewater, the contact time is 1 hour, the removal rate of phosphorus is larger than 90%, and the pH of zeolite subsequent to treatment is close to be neutral. The flyash zeolite resulting from modified synthesis in the invention not only has significant phosphorus adsorption effect, but can also realize the effective utilization of wastes to reduce the pollution of flyash to environment. Mutual combination of the flyash zeolite and the natural zeolite results in synergistic action for phosphorus adsorption, reducing the content of phosphorus in wastewater effectually. Therefore, the adsorption material of the invention for treating phosphorus wastewater has the advantages that the adsorption capacity is high, the utilization of wastes is favorable for environmental protection and the like.

The invention discloses a method for preparing an enzyme electrode with an MWCNTs-TiO2 / Nafion composite medium. In the method, MWCNTs-TiO2 core-shell nanocomposite materials are scattered into Nafion to prepare an organic-inorganic composite membrane as a fixed matrix for biological molecules for structuring a hemoglobin electrode, and a hemoglobin biosensor with fast response, high sensitivity and strong catalytic capacity is prepared by using the properties of large specific surface area, high surface reactivity, strong adsorption capacity, large electrical conductivity and the like of the MWCNTs-TiO2 core-shell nanocomposite materials and the properties of membrane forming, high chemical stability, high anti-interference capacity and the like of the Nafion. The biosensor has good biocompatibility, stability and repeatability, and has potential application in structuring biosensors. The sensor can be used for detecting the substances of hydrogen peroxide, trichloroacetic acid and the like, and has the advantages of low sensitivity, low detection limit and the like.

The invention discloses star-shaped hydroxyl polyester adopting polyhydric alcoho as a nucleus and a preparation method and an application of the star-shaped hydroxyl polyester. The preparation method comprises the following steps: enabling 1 to 8 molar caprolactone and 1 to 4 molar anhydride to react for 6 to 10 h at 80 to 140 DEG C by adopting 1 molar small molecular polylasic alcohol as a core molecule to obtain a matrix star-shaped polyester, then reacting with 1 to 4 molar monoglycidyl ether at 90 to 150 DEG C to obtain star-shaped hydroxyl polyester. The prepared star-shaped hydroxyl polyester has the advantages of simple synthesis process, high solid content and low viscosity, a hydroxyl value is 140 to 250 mg KOH / g (80 percent of solid content), the viscosity at 25 DEG C when the solid content is 80 percent is 300 to 3000cp, the star-shaped hydroxyl polyester can be cross-linked with a polyurethane curing agent containing an isocyanate group and can be used for preparing a coating with a high solid content, the VOC content at the construction viscosity is smaller than 380 g / L, and the film performance can satisfy the national standard of the solvent-type dual-component polyurethane wood coatings.

The invention belongs to the technical field of environment pollution treatment, and more specifically relates to a heavy metal-polluted soil repairing agent prepared by attapulgite. The attapulgite-based soil heavy metal repairing agent is obtained by steps of raw ore fragmentation, acidifying treatment, airing screening, roasting and soil heavy metal restoration. According to the attapulgite-based soil heavy metal repairing agent through acidifying and heat modification, attapulgite clay has characteristics of large specific surface area and high porosity amount due to sulfuric acid acidifying treatment of the attapulgite clay, activity and adsorptivity are increased, proportion of soluble heavy metals in the soil can be effectively reduced, soil heavy metal passivation effect can be reached, and soil heavy metal pollution can be remediated.

The invention discloses a nitrogen-doped graphene catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: drying and dehydrating glucose and urea, and mixing with melamine, wherein the mass ratio of the urea to melamine is 2-4; uniformly grinding the mixture, and calcining the mixture into a muffle furnace at the temperature of 550 DEG C for 3 hours; cooling and grinding uniformly, adding the mixture into a tube furnace, introducing into nitrogen protection, calcining at the temperature of 850-1000 DEG C for an hour, thereby obtaining the nitrogen-doped graphene catalyst. According to the in-situ nitrogen-doped graphene disclosed by the invention, the used raw materials are low in price, the method is simple, the yield is high, and graphite-like nitrogen doped graphene with the highest ratio is obtained by changing the rate of the raw materials and the temperature, so that the catalyst has a good oxidation-reduction effect, and expensive Pt can be replaced to a certain degree.

The invention discloses a method for preparing a graphene thin film by chemical vapor deposition at normal pressure and low temperature. According to the method, a metal substrate is subjected to high-temperature annealing treatment firstly and then temperature-reduction annealing treatment; and next, the graphene thin film is obtained on the surface of the metal substrate through the chemical vapor deposition method. By virtue of the method, the catalysis activity of the metal substrate is improved, so that the growth temperature of graphene is lowered, and the energy consumption and cost of industrial production of the graphene thin film are lowered consequently; and compared with a conventional chemical vapor deposition method for synthesizing the graphene thin film, the method disclosed by the invention is simple in process, the carbon source is wide in source, the prepared graphene thin film is high in quality, and the number of layers is uniform and controllable.

The invention relates to a novel organic sulfur hydrogenation catalyst carrier. A preparation method of the carrier comprises steps that: a neutralization material, pseudoboehmite (gamma-alumina), an adhesive, a hole expansion agent and a metal additive are mixed; the mixture is subject to knead-molding, drying, and roasting, such that a finished product is obtained. The method is characterized in that the neutralization material is prepared through steps that: pseudoboehmite is soaked by using an alkaline solution, and is neutralized by using an acid solution; and the pseudoboehmite is subject to washing and press-filtrating, such that the neutralization material is obtained. Therefore, impurity content in the pores is greatly reduced, such that the loading of active components is promoted. A catalyst prepared by using the carrier is suitable to be used in hydrogenation catalyzing of organic sulfur in natural gas, coke oven gas, exhaust gas, and the like. Organic sulfur is converted into inorganic sulfides; and the sulfides are removed with the cooperation of an inorganic sulfur desulfurizing agent.

The invention discloses a surface enhanced Raman substrate material for detecting nitrite and a preparation method thereof. The preparation method comprises the following specific steps: (1) synthesizing a gold nano-rod by a crystal seed method; (2) preparing a p-mercaptoaniline modified gold nano-rod material; (3) synthesizing a gold nano-sphere by a hydrothermal method; (4) preparing a 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material; (5) mixing the p-mercaptoaniline modified gold nano-rod material and nitrite to generate diazonium salt; (6) mixing the diazonium salt and the 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material to generate azo-dye; (7) indirectly carrying out qualitative and quantitative detection on the nitrite by utilizing a surface enhanced Raman spectrum signal of the azo-dye. The surface enhanced Raman substrate material disclosed by the invention has good surface enhanced Raman activity on a substrate and can be used for rapidly detecting the nitrite in the environment and food samples.

The invention relates to a metal-doped nitrogen-containing carbon-based catalyst of a fuel cell and application of the catalyst. The catalyst adopts organic surface active agents as a protection agent and a structural guide agent and adopts an aromatic compound and aldehyde as reaction monomers, metal elements are added in the reaction process to obtain a polymer-metal compound, and the polymer-metal compound is dried and then is subjected to high-temperature processing with inert gas or / and ammonia gas to finally obtain the metal-doped nitrogen-containing carbon-based catalyst. When the metal-doped nitrogen-containing carbon-based catalyst is used as a cathode catalyst of a proton exchange membrane fuel cell and a direct-methanol fuel cell, the oxide reduction activity, stability and toxicity resistance are excellent; moreover, the catalyst has an environment-friendly effect, is low in cost, controllable in aperture, high in specific surface area and rich in resource and can substitute for platinum to serve as an electric catalyst of the proton exchange membrane fuel cell.

The invention discloses multilevel-structure zinc oxide constructed by three dimension units and a preparation method thereof, relating to the multilevel-structure zinc oxide and the preparation method thereof. The invention solves the problems that the multilevel-structure zinc oxide prepared by the existing vapor deposition, microwave synthesis or water heating / solvent heating method has a single construction mode, and the prepared gas sensor has high working temperature in detecting ethanol. The multilevel-structure zinc oxide constructed by three dimension units is characterized in that zero-dimensional nano-particles form one-dimensional nano-wires, the nano-wires are waved to form spider net-shaped two-dimensional nano-pieces, and the nano-pieces form flower-shaped zinc oxide. The method comprises the following steps: adding the methanol solution of potassium hydroxide into the methanol solution of zinc acetate, firstly heating for reflux, standing for heat insulation, drying and heat-treating to obtain powder. If a substrate is put after the step of heating for reflux, the multilevel-structure film of zinc oxide is obtained. When the gas sensor prepared by the material detects ethanol, the working temperature is 150-250 DEG C. The material is used for gas transducers and the fields of photocatalysis.

The present invention discloses a technique which uses solid alkali to catalyze idesia polycarpa var.vestita bites to prepare biodiesel. After the extracted idesia polycarpa var.vestita bites is treated by the processes of degumming, alkali refining and deacidification and decolorization, solid alkali Mg-Al composite oxide is utilized to catalyze low-carbon alcohol, so that ester exchange reaction occurs between the low-carbon alcohol and the idesia polycarpa var.vestita bites to prepare crude biodiesel, and after depressurization and distilling, the light-colored refined biodiesel is produced. The yield of the biodiesel prepared by the technique is high, the product reaches the national standards, meanwhile, the production cost of the biodiesel can be reduced, the service life of equipment can be prolonged, the subsequent separation process can be simplified, and the drainage of industrial waste water can be reduced.

The invention relates to a pavement crack repairing material, in particular to an environment-friendly type pavement heating sealant material which is characterized by being prepared from the following raw materials in parts by weight: 50-70 parts of petroleum asphalt, 7-10 parts of an SBS modifier, 5-8 parts of an SBR modifier, 10-30 parts of waste tire rubber powder, 3-8 parts of natural rock asphalt, 5-20 parts of a phase solvent, 1-4 parts of polyester fiber, 2-5 parts of lignin fiber, 0.1-0.5 part of a cross-linking agent and 10-30 parts of a filling material. The environment-friendly type pavement heating sealant material is adopted for sealing and repairing cracks and joints of common roads, expressways and airfield runways, permeation and fusion of a sealant with an asphalt pavement at high temperature can be achieved, and the environment-friendly type pavement heating sealant material is sufficient in elasticity and free of over-flowing or tire adhesion; after being cooled, the environment-friendly type pavement heating sealant material is good in binding power, and can have elastic deformation along with expansion and shrinkage of cracks due to the relatively good elasticity.

The present invention rlates to the method of catalyzing esterification of carboxylic acid and epoxy compound with acetylacetone-based metal complex as catalyst in the reaction temperature of 70-140 deg.c. The said method can catalyze esterification, alone or corporated, of saturated or unsaturated carboxylic acid and epoxy compound in which catalytic efficiency and selectivity without promoting the ring-opening polymerization of epoxy radical. The said method can wide application foreground in industrial production.

The invention discloses a preparation method of a modified electrode for detecting uric acid, characterized by firstly preparing amino hyper branched polyamide-amine HBP-NH2, then preparing HBP-NH2 modified carboxylated carbon nanotube CCNT-HBP-NH2, and then preparing a CCNT-HBP-NH2 / UCo3O4 / Nafion electrode modification liquid; and finally, coating the electrode modification liquid on the surfaceof the polished and cleaned glassy carbon electrode, and drying to obtain a composite film modified glassy carbon electrode. The prepared composite film modified glassy carbon electrode can be used for direct detection of uric acid concentration in urine and blood plasma, and has the advantages of sensitiveness, accuracy, stableness, high selectivity and the like.

The invention provides a porous oxide / titanium dioxide microsphere composite catalytic material and a preparation method thereof. The porous oxide / titanium dioxide microsphere composite catalytic material is applicable to sewage treatment. According to the invention, a mol ratio of titanium dioxide to oxide is 1: 10 to 1: 5, and titanium dioxide and oxide are compounded to form a heterostructure; the diameter of a titanium dioxide microsphere is in a range of 10 to 70 [mu]m, and the interior of the microsphere is of a porous structure; the microsphere has a specific surface area of 20 to 90 m<2> / g; and mixed slurry of a metal ammonium salt and TiO2 powder is uniformly sprayed into liquid nitrogen in the form of mist spray, then freeze drying is carried out in a low-temperature low-pressure environment, and finally, sintering in an air atmosphere is carried out so as to obtain a porous microsphere. The preparation method provided by the invention is simple in process and easy for industrialization. The porous microsphere is prepared by accumulation of a metal oxide nanosheet and TiO2 uniformly distributed on the surface of the nanosheet, so the preapred porous oxide / titanium dioxide microsphere composite catalytic material has a great specific surface area and good photocatalysis performance.

The invention discloses a method which preprocesses grass plant fiber papermaking raw materials by using a green process before a stewing link of a pulping working procedure, uses waste hemicelluloses in pulp preparation as raw materials and takes a green environment-friendly ionic liquid as a catalyst to prepare furfural, and simultaneously optimizes the utilization of resources and energy sources of the current papermaking industry, wherein the prepared furfural is a high value-added product. Solid substances processed by the method are used as high quality grass plant fiber papermaking raw materials without changing the traditional pulp technology. The invention improves the resource utilization ratio, realizes the multipurpose development of raw material components, lightens the processing difficulty of the pulping process, is favorable for lowering cost and protecting environment, simultaneously fully utilizes vapor as an effective energy source generated by stewing pulp in a paper plant, improves the utilization ratio of the energy sources, and provides a green environment-friendly economic approach for the grass plant fiber papermaking process.

The invention relates to a positive pole coating for an ion membrane electrolysis bath. The positive pole coating is characterized by comprising, in weight percent, 35-45mol% of ruthenium, 5-15mol% ofiridium, 5-10mol% of platinum, 35-45mol% of titanium and smaller than 4%mol% of other additives. The additives comprise zirconium chloride or palladium chloride. The positive pole coating for the ionmembrane electrolysis bath is used for an active anode, an oxygen evolution potential is high, catalytic ability is high, conductivity is high, oxygen evolution side reaction cannot be easily generated, the coat is stable in performance, resistant to corrosion, long in service life, coating can continue to be used after recoating after an electrode is faulted, electrodes is effectively controlled, product quality is improved, and required chlorine purity is high, and oxygen content is low.

The invention relates to the technical field of water treatment, in particular to a method for degrading organic pollutants in water by activating peracetic acid with a nitrogen-doped carbon material.The method comprises the following steps: adding a peroxyacetic acid solution into a to-be-treated organic pollutant aqueous solution, and adjusting the pH value to 6.5-7.5 to obtain a mixed solution; and adding a nitrogen-doped carbon material into the mixed solution, and carrying out degradation treatment on the obtained reaction solution. According to the method, nitrogen atoms with relativelyhigh electronegativity are doped in the nitrogen-doped carbon material, so that the nitrogen-doped carbon material has relatively strong adsorption and catalytic properties; and pyridine nitrogen, graphite nitrogen, pyrrole nitrogen atoms, crystal form defects and the like on the surface of the nitrogen-doped carbon material are used as active sites to be combined with peracetic acid, so that peracetic acid can be decomposed to generate singlet oxygen, hydroxyl free radicals and organic carbon free radicals to quickly oxidize pollutants, and the organic pollutants are removed through oxidation.

The invention discloses preparation and application of an Mxene-Mn3(PO4)2 composite electrode material. The preparation is characterized in that two-dimensional Ti3C2 nanosheets are synthesized from aTi3AlC2 ceramic material as a raw material, and ATP (adenosine triphosphate) is used as a template to induce synthesis of Mn3(PO4)2 nanoparticles. The Ti3C2 / Mn3(PO4)2 nanocomposite synthesized with the method integrates good conductivity of Ti3C2 and biological mimetic enzyme activity of Mn3(PO4)2, and the composite material has excellent conductivity and catalytic performance by complementary advantages of the two raw materials, and is the excellent electrode material for preparing superoxide dismutase. The composite material can be used for constructing biosensors and has excellent application prospects in the fields of medical diagnosis, medical research and the like.

A nano-class damping emulsion paint is prepared from silisic prepane emulsion, polyurethane prepolymer, nano ZnO, nano TiO2, nano calcium carbonate, disperser, nano-class pigment, filming assistant, perfum and distilled water. Its advantages are high resistance to mildew, water, bacteria, yellowing and flush, smooth surface, both photocatalytic and nano-metal bacticiding effect, and better hydrophobicity and oleophobicity.

The present invention discloses a novel efficient resource utilization method of electroplating sludge and carbon dioxide co-processing. The novel method uses electroplating sludge as a raw material to prepare biochar, which is used as a cathode catalyst for a bioelectrochemical system, to achieve efficient resource utilization of electroplating sludge, and conducts co-processing of carbon dioxide to obtain the an organic product with high added value. The present invention uses electroplating sludge rich in heavy metals as the raw material for preparing biochar, which is used as the cathode catalyst for the bioelectrochemical system; the method has simple process, low cost, mild reaction conditions; and the prepared biochar has stable performance, strong ability to catalytic reduction of carbon dioxide, and can be used to catalytic reduction of carbon dioxide to achieve co-efficient resource utilization of the electroplating sludge and carbon dioxide.

The invention provides a catalyst for catalyzing saccharides to synthesize 5-hydroxymethyl furfural and a method of catalyzing saccharides to synthesize the same. In the invention, a compound containing metal ions and an organic ligand are used for synthesizing MOF, wherein the ligand supplies a Bronsted acid active center while the metal supplies a Lewis acid active center. The catalyst can greatly improve the catalytic conversion efficiency of glucose; meanwhile, the catalyst has strong catalysis performance on disaccharides and polysaccharides, even crop straws, cotton, hemps and other biomass raw materials; in addition, the method of catalyzing saccharides to synthesize the 5-hydroxymethyl furfural has high reaction rate and gentle reaction conditions. Being different from conventional homogeneous catalysts, the solid-phase catalyst is easy to recycle and reutilize. The MOF catalyst has good stability and can be recycled without regeneration. The catalyst not only reduces environment pollution but also greatly reduces preparation cost. The product, HMF, is easy to separate, so that the method is simple and convenient.

The invention relates to an efficient Ni / Ni(OH)2 hydrogen evolution electrode, which is characterized in that nickel sulfate hexahydrate and nickel chloride are adopted as sources of nickel elements,and nickel and hydroxide nanoparticles thereof are uniformly doped into a catalyst layer through a direct-current electrodeposition method in combination with subsequent oxidation-reduction treatment,so that the efficient Ni / Ni(OH)2 hydrogen evolution electrode is prepared. The invention also relates to a preparation method of the high-efficiency Ni / Ni(OH)2 hydrogen evolution electrode, which comprises the following steps: (1) pretreating the conductive substrate; (2) carrying out DC electrodeposition to prepare a catalyst layer formed by stacking nano flaky nickel and hydroxide thereof; and(3) carrying out anodic oxidation treatment to obtain the Ni / Ni(OH)2 hydrogen evolution electrode. The Ni / Ni(OH)2 hydrogen evolution electrode is scientific and reasonable in design and has the advantages of being high in catalytic hydrogen evolution activity, low in cost, low in energy consumption, stable in use, good in electrical conductivity and the like. The invention provides the Ni / Ni(OH)2hydrogen evolution electrode and the preparation method thereof with relatively high innovativeness.

The invention relates to a detection method in the technical field of electrochemistry, specifically relates to an sandwiched electrochemical adapter sensor for quick detecting thrombin by utilizing reduced graphene modified by nanogold-formylimidazole and cobalt-palladium nanoparticles, and belongs to the technical fields of a novel functional material and biosensing analysis. The electrochemical adapter sensor for detection of thrombin has a linear range of 0.010-2.00 ng*ml<-1> and a detection limit of 0.0032 ng*ml<-1>.