40results about How to "Reduce active sites" patented technology

The application relates to the field of processing of a lithium battery, in particular to a cathode material, a preparation method thereof and a lithium ion battery containing the same. The cathode material comprises a lithium-containing cathode material and an indium oxide cladding layer coated on the surface of the lithium-containing cathode material. The preparation method comprises the following steps of: adding a soluble indium salt into a solution dissolved with an alkaline substance and stirring to form a sol; adding the lithium-containing cathode material into the sol and stirring to lead a generated sediment to be uniformly deposited and attached onto the surface of the lithium-containing cathode material; removing a liquid to obtain a lithium-containing cathode material solid body attached with the sediment; and roasting the lithium-containing cathode material solid body attached with the sediment to form the lithium ion cathode material coated with indium oxide on the surface. Compared with other inertia cladding materials such as aluminum oxide, the cathode material provided by the invention has the advantages that the electronic conductivity of indium oxide is excellent, and moreover, the discharging specific capacity, the cycling performance and the safety performance under high voltage can be obviously improved.

The invention discloses a magnetic catalyst MnFe2O4-MIL-53(Al) composite as well as a preparation method and an application thereof. A prepared MOF (metal organic framework material) MIL-53(Al) is added to a metal salt precursor for synthesizing MnFe2O4, and the catalyst MnFe2O4-MIL-53(Al) composite is prepared with a sol-gel method. The prepared supported MnFe2O4-MIL-53(Al) composite has bulk morphology and nanoparticles MnFe2O4 uniformly distributed on MIL-53(Al). The catalyst MnFe2O4-MIL-53(Al) composite has excellent catalytic degradation capacity for refractory organic matters in the presence of PMS, has the degradation rate for rhodamine B up to 99% and is convenient to prepare and easy to recycle.

The invention relates to the fields of resource utilization of waste biomasses and preparation of biomass carbon materials, and discloses a method for preparing an electrode carbon material for an electrochemical capacitor from peanut shells. The method comprises the following steps: performing hydrothermal reaction process on the peanut shells to generate lightly carbonized lignite-shaped hydrothermal carbon, completely mixing the hydrothermal carbon and salt, and further performing carbonization and activation at high temperature to prepare a porous carbon material. The porous carbon prepared by the method is high in specific surface area and reasonable in pore diameter structure, and serves as an electrode active material of the electrochemical capacitor. The specific capacitance valuereaches 447 F / g under the current density of 0.2 A / g. After cylic test is conducted for 10000 times under high current density of 10 A / g, the retention rate of 90 percent still can be maintained and high cycling stability is achieved. Compared with a single molten salt activation method, the porous carbon material which is prepared by a hydrothermal-molten salt combination technology has the following advantages: the capacitance performance is obviously improved, and the technology provides a brand new and reliable resourceful treatment mode for high-additional-value utilization of biomasses.

The invention discloses a method for synthesizing diphenylmethanol through catalytic hydrogenation of diphenylketone. The method comprises the following steps of adopting a loaded type multi-componentcatalyst, and adding a protecting agent into a reaction system, wherein the loaded type multi-component catalyst is Pd-Cu-Sn / C (palladium-copper-stannum / carbon), a carrier is activated carbon, an active component is Pd, the additives are Cu and Sn, the loading amount of Pd is 1 to 10 wt%, the loading amount of Cu is 1 to 5 wt%, and the loading amount of Sn is 1 to 5 wt%; the protecting agent is sodium acetate. The method can be used for improving the conversion rate of diphenylmethyl ketone and the selectivity of diphenylmethanol.

The invention discloses a preparation method of porous carbon based on polyaniline nanofiber. The preparation method comprises the following steps: 1, preparing polyaniline (SiO2 / PANI) nanofiber; 2, modifying the polyaniline (SiO2 / PANI) nanofiber; 3, synthesizing a modified polyaniline (SiO2 / PANI) nanofiber material; 4, synthesizing porous carbon of the polyaniline nanofiber; 5, removing SiO2 spheres. By adopting the method, impurities are removed by repeated cleaning in the preparation process, so that a high-purity product is obtained. Moreover, the preparation process is convenient for accurate control.

The invention discloses a TNT / CdS / TiO2 / Pt core-shell structure nanotube and a preparation method thereof. The nanotube comprises a titanic acid nanotube TNT, a CdS quantum dot, a TiO2 shell layer anda metal Pt in sequence from inside to outside. According to the invention, a titanic acid nanotube carrier (TNT) is prepared by utilizing a hydrothermal method; the CdS quantum dot is prepared by adopting a heat injection method; the CdS quantum dot is loaded by taking the titanic acid nanotube carrier (TNT) as a main body; and a TiO2 shell layer is grown by adopting an atomic layer deposition technology, and Pt is loaded, so that the nanotube with the TNT / CdS / TiO2 / Pt core-shell structure is prepared. The core-shell structure composite material prepared by the invention is regular in structure, ordered in electron transfer path and good in stability, has excellent photocatalytic activity, and is well applied to the aspects of lithium ion batteries, supercapacitors, gas sensing, photocatalysis and the like.

The invention relates to the technical field of photodegradable adsorption materials, and discloses a photocatalyst-loaded Co-based MOFs-porous carbon composite adsorption material and a preparation method thereof, and the photocatalyst-loaded Co-based MOFs-porous carbon composite adsorption material comprises the following formula raw materials: chitosan, coal ash, TiO2, Ta2O5, Na2CO3 and sulfydryl-modified Co-based MOFs. The invention discloses the photocatalyst loaded Co-based MOFs-porous carbon composite adsorption material and the preparation method thereof. Due to the HTiTaO5 lamellar structure, the transmission distance of charge carriers is shortened, the transmission rate of electrons is increased, the HTiTaO5 is uniformly loaded into the specific surface and the mesoporous structure of a sulfydryl modified Co-MOFs calcined product, the calcined product of the carbon skeleton has good conductivity, the diffusion and transmission rate of photon-generated carriers can be increased, the compounding of HTiTaO5 photo-induced electrons and photo-induced holes is effectively inhibited, hydrogen bonds and Van der Waals' force can be formed between chitosan hydroxyl and amino groups and organic pollutants, and the recycled waste coal ash has a rich pore structure and can be used for well physically adsorbing heavy metals such as copper, cadmium, arsenic, mercury and ions thereof in water.

The invention discloses a method for constructing a tartaric acid coating layer with a corrosion protection function on the surface of magnesium metal. The method comprises the following steps: A. polishing and carrying out ultrasonic cleaning on a pickling solution; B. soaking the magnesium metal obtained in the step A in NaOH solution with a concentration of 3mol / L, placing the NaOH solution in a water bath environment at 50-70 DEG C, standing for 11-14h, carrying out alkaline activation pre-treatment, then thoroughly washing the magnesium metal, and then drying the magnesium metal; C. preparing a tartaric acid solution with a concentration of 5-25g / L, and adjusting the pH value of the tartaric acid solution to achieve 5-9 by virtue of NaOH with a concentration of 1mol / L; and D. soaking the magnesium metal obtained in the step B in the tartaric acid solution prepared in the step C, placing the tartaric acid solution in a water bath environment at 30-80 DEG C, standing for 3-12h, then taking out the magnesium metal and thoroughly washing the magnesium metal by virtue of deionized water, and carrying out vacuum drying; and the tartaric acid coating layer with the corrosion protection function is successfully constructed on the surface of the magnesium metal. After the surface of the magnesium metal is modified through the method, the corrosion speed of a corrosive environment for the magnesium metal can be much effectively controlled, so that the corrosion-degradation period of the magnesium metal is matched with the treatment-recovery period of organisms when the magnesium metal is used as a biodegradable medical material.

A modified ternary cathode material and a preparation method thereof; a lithium ion battery is provided, wherein the general formula of the modified ternary cathode material is LiNixCoyM1- X- YO2 @ aLiInO2, where 0.8 <= x < 1, 0 < y < 1, 0 < 1- X- Y< 1, M is Mn and / or Al element, a is the content of lithium meta indium oxide coating layer, based on the total weight of the modified ternary cathodematerial, 0 <a<=10% by weight. The invention also includes a preparation method of a modified ternary cathode material and a lithium ion battery. The modified ternary cathode material of the inventionhas good cycle stability and magnification performance, and the preparation method is simple in operation, low in cost and safe and reliable. On this basis, the discharge capacity and cycle performance of the lithium ion battery using the modified ternary cathode material as the cathode material are significantly improved, and the lithium ion battery can be used in the field of power battery.

The invention discloses a method for utilizing a carbon nitride / nitrogen doped mesoporous carbon / bismuth trioxide ternary Z-type light catalyst to catalyze and remove antibiotics. The method adopts the hollow carbon / nitrogen doped mesoporous carbon nitride / bismuth trioxide ternary Z-type photocatalyst to treat antibiotics, the hollow carbon / nitrogen doped mesoporous carbon nitride / bismuth trioxideternary Z-type photocatalyst uses graphite-phase carbon nitride as a carrier, and its surface is modified with nitrogen doped hollow mesoporous carbon and bismuth oxide. The method utilizes the carbon nitride / nitrogen doped mesoporous carbon / bismuth trioxide ternary Z-type light catalyst to conduct photocatalytic degradation on the antibiotics, can effectively remove different types of antibiotics, has the advantages of high removal rate, quick removal, easy implementation, high safety, low cost, no secondary pollution and the like, in particular can achieve efficient removal of antibiotics in water and has a very good practical application prospect.

The invention relates to the technical field of supercapacitors, and discloses a polyindole-coated nickel-cobalt compound supercapacitor material and a preparation method thereof, and the polyindole-coated nickel-cobalt compound supercapacitor material comprises the following formula raw materials: nickel-cobalt layered double hydroxide, S / N co-doped carbon nanotubes, indole-6-carboxylic acid, 4-nitrobenzaldehyde, tert-butyl isocyanide and ammonium persulfate. The invention discloses a polyindole coated nickel-cobalt compound supercapacitor material and a preparation method thereof. The nickel-cobalt layered double hydroxide has excellent electrochemical performance and chemical stability; the mixture is uniformly dispersed into S / N doped porous carbon nanotubes; the reduction of active sites due to agglomeration and caking is avoided; n atoms are doped, so that the conductivity of the electrode material is improved, the polyindole derivative coats the nickel-cobalt layered double hydroxide, the volume expansion of the electrode material is inhibited, the polyindole derivative has excellent conductivity, the diffusion and transmission rates of charges and metal ions are improved, and the number of charge carriers is increased.

The invention discloses a CdS nanorod@ few-layer ReS2 nanosheet composite photocatalyst, and a preparation method thereof. The preparation method mainly comprises following steps: 1, ball milling is carried out to prepare ReS2; 2, ReS2 powder is dispersed in a solvent such as ethanl for ultrasonic peeling; 3, an obtained ultrasonic dispersed solution is subjected to centrifugalization, a product is collected, washed, and freeze-dried so as to obtain few-layer ReS2 nanosheet; 4, cadmium acetate dihydrate and dibenzyl disulfide are ultrasonically dispersed in deionized water and ethanol respectively, obtained two suspensions are introduced into an autoclave for hydrothermal treatment, and at last, an obtained corresponding product is subjected to centrifugalization washing for several timesto obtain CdS nanorod; and 5, the prepared CdS nanorod and the ReS2 nanosheet are subjected to second hydrothermal compounding so as to obtain the CdS nanorod@ReS2 nanosheet composite photocatalyst. The CdS nanorod@ReS2 nanosheet composite photocatalyst prepared through the preparation method is excellent in performance, simple in operation and high in application value.

The invention relates to a potassium ion battery positive electrode material and a preparation method thereof, and a potassium-iodine battery. The positive electrode material comprises a porous carboncarrier and an iodine elementary substance loaded on the porous carbon carrier. The porous carbon carrier is internally provided with micropores and mesopores, and the iodine elementary substance isabsorbed and filled into the mesopores and micropores of the porous carbon carrier. During preparation, the porous carbon carrier is prepared by an alkali-etching and pore-forming method, and then theiodine elementary substance is loaded on the porous carbon carrier by an impregnation method. The potassium-iodine battery comprises a positive electrode, a negative electrode and an electrolyte solution; the positive electrode is made of a potassium ion battery positive electrode material, and the negative electrode is made of potassium. Compared with the prior art, the self-supporting porous carbon carrier is used as a substrate, and high-quality loading of the active component iodine elementary substance is realized by the simple solution impregnation method, and the potassium ion batterypositive electrode material loaded with the iodine elementary substance is prepared, is used for assembling the high-capacity potassium-iodine battery with high energy density and excellent cycling stability and has broad application prospects.

The invention discloses a preparation method of a conductive, wave-absorbing and anti-corrosion integrated coating based on Mxene. The preparation method comprises the following steps: preparing 1-50 parts of GNS magnetic filler; the preparation method comprises the following steps: adding 1-50 parts of GNS / Mxene / magnetic filler into 1-100 parts of epoxy resin, then adding 0.5-2 parts of a dispersing wetting agent, 0.5-1 part of an anti-settling agent, 1-5 parts of spherical conductive carbon black, 0.5-1 part of a defoaming agent and 0.5-1 part of a corrosion inhibitor, and compounding to obtain a coating finished product. According to the preparation method of the Mxene-based conductive, wave-absorbing and anti-corrosion integrated coating with the structure, the GNS / Mxene / magnetic filler composite substance keeps stable performance of Mxene, and the prepared coating has excellent conductive performance, wave-absorbing performance and anti-corrosion performance.

The invention discloses a preparation method of artificial graphite and a lithium ion battery. The preparation method of the artificial graphite comprises the following steps: S10, carrying out graphitization treatment on raw material coke powder to obtain an intermediate; s20, uniformly mixing a second raw material with the intermediate to obtain a composite precursor; amd s30, carrying out carbonization treatment on the composite precursor at 900-1400 DEG C under the protection of protective gas to obtain artificial graphite; wherein the second raw material comprises a liquid-phase coating agent. Through liquid phase coating, the surface morphology of the artificial graphite can be effectively improved, the specific surface area is reduced, active sites of side reactions are reduced, gas production of the lithium ion battery is reduced, volume expansion is reduced, and the safety performance of the lithium ion battery is improved; in addition, graphitization treatment is performed firstly and then coating is performed, so that the prepared artificial graphite has relatively good liquid absorption performance, the internal resistance is reduced, the low-temperature performance is improved, the reduction of the internal resistance is beneficial to the movement of lithium ions, and the prepared lithium ion battery has relatively good fast charging performance.

In the field of carbon airgel synthesis, the present invention discloses a device and method for preparing carbon airgel by CVD after carbon nanotubes are activated by an electric arc. The vacuum system is connected to the pipeline of the carbon nanotube storage tank, the carbon nanotube storage tank is provided with a carbon nanotube feed port, the left side of the carbon nanotube feed port is provided with an inert carrier gas inlet, and the inert carrier gas inlet passes through the pipeline It is connected to the left end of the reactor, the reactor is equipped with an arc generator, the reactor is equipped with a carbon source inlet, the outside of the reactor is equipped with a temperature control system, and the right end of the reactor is connected to the pipeline of the finished product collection storage tank. The invention uses the high temperature of a high-power arc to excite the metal into fine nano-scale gaseous particles, which can be uniformly coated on the surface of the carbon nanotubes, and then the carbon airgel grown by CVD has a high degree of graphitization and a lower bulk density. Low thermal conductivity and good thermal insulation performance. The device of the invention has simple structure, stable and easy-to-control method, and the continuous preparation of carbon nanotube aerogels with different property indexes can be realized by switching the electric arc power.

The invention relates to the fields of resource utilization of waste biomasses and preparation of biomass carbon materials, and discloses a method for preparing an electrode carbon material for an electrochemical capacitor from peanut shells. The method comprises the following steps: performing hydrothermal reaction process on the peanut shells to generate lightly carbonized lignite-shaped hydrothermal carbon, completely mixing the hydrothermal carbon and salt, and further performing carbonization and activation at high temperature to prepare a porous carbon material. The porous carbon prepared by the method is high in specific surface area and reasonable in pore diameter structure, and serves as an electrode active material of the electrochemical capacitor. The specific capacitance valuereaches 447 F / g under the current density of 0.2 A / g. After cylic test is conducted for 10000 times under high current density of 10 A / g, the retention rate of 90 percent still can be maintained and high cycling stability is achieved. Compared with a single molten salt activation method, the porous carbon material which is prepared by a hydrothermal-molten salt combination technology has the following advantages: the capacitance performance is obviously improved, and the technology provides a brand new and reliable resourceful treatment mode for high-additional-value utilization of biomasses.

The invention belongs to the technical field of hydrogenation catalysts, and discloses a hydrogenation catalyst based on a carbon nanotube / alumina composite carrier, a preparation method and an application thereof. The aqueous dispersion of carboxylated carbon CNT is mixed with AlOOH sol, and the CNT-AlOOH sol mixture is wrapped with activated γ-Al 2 o 3 , dried and calcined at 350-600°C under an inert atmosphere to obtain CNT@γ‑Al 2 o 3 Carrier; dissolving the salts of non-precious metal A in ethylene glycol, or dissolving the salts or acids of noble metal B in HCl, respectively, with CNT@γ‑Al 2 o 3 Mix the carrier, adjust the pH value, add hydrazine hydrate and carry out the reduction reaction, cool, filter with suction, wash with water, and dry to obtain A / CNT@γ‑Al 2 o 3 or B / CNT@γ‑Al 2 o 3 hydrogenation catalyst. The method improves the utilization rate of the CNT, enhances the mechanical strength of the catalyst, and improves the activity of the hydrogenation reaction.

The invention provides preparation and application of a Fe-N-CNFs (Carbon Nanofibers) catalyst based on Fe-MIL, and the method is as follows: firstly, ferric chloride hexahydrate and terephthalic acid react in N, N-dimethylformamide to generate a Fe-MIL precursor, then the Fe-MIL precursor and a nitrogen-containing binder are mixed in N, N-dimethylformamide for electrostatic spinning to prepare nanofibers, and then the nanofibers are prepared into the Fe-N-CNFs catalyst based on Fe-MIL, and the Fe-N-CNFs (Carbon Nanofibers) catalyst is prepared after the Fe-N-CNFs catalyst is subjected to pre-sintering and pyrolysis. The catalyst is large in active area, high in electron transfer capability and high in mass transmission capability, so that the capability of catalyzing the oxygen reduction reaction is relatively high. In addition, the synthetic material is low in price, and the cost of the catalyst can be reduced, so that the catalyst has a relatively great application prospect in the aspect of proton exchange membrane fuel cells.

The invention provides a preparation method of Pr(OH)3 one-dimensional nano-rods. The preparation method comprises the following steps: preparing a precursor solution, and generating the Pr(OH)3 one-dimensional nano-rods on the surface of a working electrode through a one-step constant current electrochemical plating technology, wherein the precursor solution is a praseodymium salt and ammonium salt mixed aqueous solution, the concentration of praseodymium salt in the precursor solution is 1-8 g / L, and a ratio of the praseodymium salt to ammonium salt is (1-7):1; and the electrochemical plating temperature is 60-80 DEG C, the electrochemical plating current is 1.5-2 mA, and the electrochemical plating time is 1-3 h. The preparation method has the advantages of low energy consumption, simplicity in operation, and easy realization of scale expansion, and the prepared Pr(OH)3 one-dimensional nano-rods can effectively store energy by means of the high specific surface area and the super capacitance performance of praseodymium hydroxide one-dimensional nano-rods, provides a very good material for present energy storage problem, and has great application prospect.

The invention relates to a method for epitaxially preparing graphene and graphene devices by pretreating SiC substrates. It includes the steps of: performing hydrogen etching on the SiC substrate, and then performing oxidation treatment on the SiC substrate after hydrogen etching, at a temperature of 800-1300° C., and a treatment time of 15-120 minutes; The temperature of the substrate is raised to 1450-1700°C for graphene growth. The present invention passivates the surface of SiC through oxidation pretreatment, reduces the nucleation density of SiC substrate epitaxial growth graphene, thereby obtains the graphene material with larger size and better performance, and on this basis SiC epitaxial graphene The wafer undergoes deposition, photolithography, doping and integration procedures to prepare corresponding graphene devices.

The invention provides a cathode plate and a preparation method thereof and a lithium ion battery. The cathode plate consists of a cathode current collector and a cathode active substance layer. The cathode active substance layer consists of a cathode active material, a conductive agent; a binder; and an additive. The additive of the cathode plate disclosed by the invention can coat the surface of the cathode active material well after catalytic polymerization under voltage, so that a layer of uniformly distributed protective film is formed, and thereby the objective of improving the electrochemical properties of lithium ion batteries is achieved.

The invention discloses a capacitive deionization device for removing various ions in water. An anode chamber (3) and a cathode chamber (7) are connected and closed up and down through threads to form a sandwich structure; the anode chamber (3) is separated from the cathode chamber (7) by a spacing ring (5); a capacitive deionization electrode is of a disc-shaped integral structure formed by compounding a circular mesh electrode and a carbon aerogel circular ring, and the outer diameter of the circular mesh electrode is matched with the inner diameter of the carbon aerogel circular ring; the circular mesh electrode (401) is made of foamy copper, and the surface and the interior of the foamy copper are filled with carbon aerogel; the spacing ring (5) is formed by combining an upper gasket (501), an ion exchange membrane (502) and a lower gasket (503) from top to bottom; and the specific surface area of the carbon aerogel is greater than or equal to 680m < 2 > / g. The capacitive deionization device has the advantages that the installation is simple, the sealing performance is excellent, use of a binder and a conductive agent is avoided, and the like, and the device can be used for removing various ions such as sodium, calcium, magnesium, fluorine and the like in water.

The invention provides a catalyst for preparing hydroxyaldehyde by olefine aldehyde hydration and a method thereof, the catalyst adopts a multi-amino acid resin catalyst, and the multi-amino acid resin comprises a polystyrene-divinyl body and a functional group loaded on the surface of the polystyrene-divinyl body; the functional group simultaneously contains an alkaline amino functional group and an acidic functional group, the alkaline amino functional group and the acidic functional group are synergistically catalyzed, the conversion rate of olefine aldehyde can be more than or equal to 50% and the selectivity of the hydroxy aldehyde can be more than or equal to 95% when the functional group is applied to preparation of the hydroxy aldehyde from the olefine aldehyde, the phenomena of catalyst pulverization and the like can be avoided, and industrial implementation is more facilitated.

The invention discloses a method for synthesizing benzphenyl alcohol by catalytic hydrogenation of benzophenone. The method is as follows: the method adopts a supported multi-component catalyst and adds a protective agent in the reaction system; the supported The multi-component catalyst is Pd-Cu-Sn / C, the carrier is activated carbon, the active component is Pd, and the additives are Cu and Sn, wherein the loading of Pd is 1-10wt%, and the loading of Cu is 1-5wt %, the load of Sn is 1-5wt%; the protective agent is sodium acetate. The method of the invention can improve the conversion rate of benzophenone and the selectivity of benzhydryl alcohol.

The invention discloses a preparation method of a PEM water electrolysis membrane electrode, which comprises the following steps: spraying different components of a catalyst layer multi-component composite slurry independently in an ultra-short time by adopting a multi-nozzle type spraying device, and accurately controlling the spraying rate and atomization degree of the different components, so as to prepare the PEM water electrolysis membrane electrode. The problem of poor dispersibility of different catalysts and binders in the catalyst slurry in the same solution is solved; the multi-component composite slurry comprises catalysts with different components, high-conductivity short-side-chain perfluorinated sulfonic acid resin, a high-chemical-stability nano additive and the like, the proton transmission rate of the water electrolysis membrane electrode can be effectively increased, the electrolysis voltage can be reduced, the cost of PEM electrolyzed water is further reduced, and the service life is prolonged; the membrane electrode provided by the invention can be applied to devices such as a PEM water electrolyzer and a PEM water electrolysis hydrogen production system to be used as a proton exchange membrane electrode.