10results about How to "Improve electrocatalytic efficiency" patented technology

The invention relates to the technical field of electrochemical catalysts, and discloses a preparation method and application of a high-activity supported PtIr alloy OER catalyst, and the preparation method comprises the following steps: S1, preparation of a carrier: ultrasonically dispersing titanium oxide in a mixed solution of water and a reducing agent, adding a platinum precursor, uniformly mixing, and carrying out reflux treatment to obtain a black carrier; s2, load annealing: uniformly mixing the black carrier obtained in S1 with an iridium precursor in a reducing agent, and annealing in air to obtain black powder; and S3, washing and drying: carrying out centrifugal washing on the black powder obtained in S2, and finally drying to obtain the PtIrTi compound catalyst. According to the PtIr-based electrode catalyst with high activity, the catalyst is widely applied to electrochemical reaction and shows excellent performance in the water electrolysis catalytic oxidation process, the activity of the catalyst is higher than that of a single platinum or iridium catalyst, and the preparation method is simple in operation steps and production equipment, high in safety and reliability and low in preparation cost.

The invention provides a wastewater treatment method. The wastewater treatment method comprises the following steps: S1, acidifying wastewater, and mixing the acidified wastewater with activated carbon and persulfate for reaction to obtain acidified wastewater; and S2, inserting a cathode plate and an anode plate into the acidified wastewater, and then carrying out electrocatalytic reaction. According to the wastewater treatment method provided by the invention, organic pollutants in wastewater are degraded by coupling three-dimensional electrocatalytic oxidation with persulfate activation until the wastewater reaches the standard and is discharged.

The invention relates to the technical field of preparation of electrocatalysts, in particular to a super-hydrophilic strong sulfur-phobic bifunctional catalyst as well as a preparation method and application thereof, comprising synthesis of a CoMoFe-LDF / NF hydroxide precursor, preparation of CoMo-Fe3Se4 / NF by hydrothermal selenylation and application of the catalyst in SOR and HER. The structure of the catalyst shows super-hydrophilic performance, wettability between an electrolyte and an electrode can be remarkably improved, hydrogen bubbles are promoted to be released from the surface of the electrode more easily, and therefore sufficient active site supply is guaranteed, and HER efficiency is greatly improved. In addition, the material also shows strong sulfur phobicity, can effectively avoid the deposition of sulfur element on the surface of the catalyst in the SOR process, and reduces the risk of catalyst deactivation. In conclusion, the novel catalyst not only has excellent electrocatalytic activity, but also shows wide application in hydrogen evolution reaction and sulfur ion oxidation reaction.

The invention relates to an efficient electrode material for solid polymer water electrolysis, in particular to a low-oxygen-evolution-potential electrode with base metal as a raw material and a preparation method of the low-oxygen-evolution-potential electrode. According to the method, a heteropolyacid compound with an absent Dawson structure is obtained through coprecipitation and nanometer grading technologies, the molecular formula of the heteropolyacid compound is Na8K18 [Sc12 (H2O) 6 (OH) 3 (HPO4) 2 (Se2Mo18O62) 3]. XH2O, the overpotential of the oxygen evolution reaction of the catalyst is lower than 300 mV, and the cycle life of the catalyst at 1 Acm <-2 > reaches up to 200 h. Compared with a traditional precious metal electrode, the base metal electrode is lower in cost, shows excellent electrocatalytic activity and stability, can keep efficient performance under long-time operation, and provides an economical and efficient solution for wide application of a solid polymer water electrolysis technology.

The invention discloses a ternary metal telluride bifunctional catalyst for hydrogen production from water and a preparation method thereof.The preparation method comprises the specific steps that ferric nitrate nonahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and fumaric acid serve as raw materials, the raw materials are stirred to be uniform in N, N-dimethylformamide, and Fex (CoNi)-MOF is obtained through reaction under specific conditions of a reaction kettle, centrifugation, cleaning and drying; then carrying out high-temperature calcination on the Fex (CoNi) Tex and tellurium powder according to a specific ratio in H2 / Ar mixed gas to prepare Fex (CoNi) Tex; fex (CoNi) Tex is loaded on foamed nickel, the catalyst material Fex (CoNi) Te (at) NF is prepared, and Fe2 (CoNi) Te (at) NF has excellent HER and OER catalytic activity, has rich active sites and has the excellent characteristics of low overpotential, excellent dynamics, small impedance, good cycling stability and the like. The efficient non-noble metal catalyst which is low in cost and excellent in catalytic activity is provided for hydrogen production through water electrolysis, and the commercialization process of the hydrogen production technology can be powerfully promoted.

The present application relates to a kind of carbon nanotube-Fe base hydrogen production electrocatalyst and application, belong to water electrolysis hydrogen production technical field.The present application is mainly realized by the following steps: one, current collector surface pretreatment;Two, solvothermal synthesis Fe base precursor;Three, in situ preparation carbon nanotube-Fe base electrocatalyst under chemical vapor deposition;Four, electrochemical in situ activation.The present application proposes carbon nanotube-Fe base composite electrocatalytic structure in situ construction on the surface of conductive current collector for the first time.Under the synergistic effect of each parameter in preparation process, the obtained structure not only can give full play to the conductive and structural advantages of carbon nanotube, but also can regulate the electronic structure of Fe base active site through interface coupling effect, so as to significantly improve the performance of water electrolysis hydrogen production.Compared with prior art, in situ preparation electrocatalyst is in situ bonded with current collector and has good dispersibility, and carbon nanotube-Fe base electrocatalyst is conducive to forming conductive network and improving electrocatalytic efficiency.

The application discloses a copper-based compound for electrocatalytic sulfur ion oxidation assisted hydrogen production and a preparation method and application thereof, and belongs to the field of electrochemical catalysis. The method comprises the following steps: S1, dissolving copper nitrate in a solvent under ultrasonic stirring to configure a copper salt solution, immersing pretreated foamed nickel in the copper salt solution to obtain a mixture; S2, sealing the mixture in a stainless steel autoclave with a polytetrafluoroethylene liner, and performing a reaction under heating; S3, after the reaction, cooling to room temperature, cleaning the foamed nickel after the reaction with deionized water, and drying to obtain a product Cu2(OH)3NO3@NF, which solves the problems of existing catalyst deactivation and surface passivation caused by accumulation of elemental sulfur or polysulfides on active sites.

This invention discloses a two-dimensional porous carbon material, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production technology. The preparation method of the two-dimensional porous carbon material is as follows: a polyacrylamide solution, a reducing agent, a sulfur-containing compound, and a metal salt are stirred to form a gel-like spatial network structure, followed by a microwave hydrothermal reaction to obtain a precursor; the precursor is dissolved in a water-soluble salt to obtain a mixed solution, which is then freeze-dried to obtain a mixture; the mixture is annealed, and after annealing, it is washed with water to obtain the two-dimensional porous carbon material. The two-dimensional porous carbon material prepared by this invention possesses excellent conductivity and a continuous electron transport path, providing a sufficient electrode / electrolyte interface for the electrocatalytic hydrogen evolution reaction and improving the electrocatalytic efficiency of sulfides.

The invention discloses a Co9S8 / CoOOH-coated NF self-supporting electrode and a preparation method thereof, and the method comprises the following steps: growing a Co9S8 precursor on an NF substrate through a hydrothermal reaction, then soaking the Co9S8 precursor in a hydrogen peroxide solution, and preparing the Co9S8 / CoOOH-coated NF self-supporting electrode through a chemical oxidation reconstruction mode. The technological process is simple and rapid, the prepared electrode is large in specific surface area, high in conductivity and multiple in electrochemical active sites, compared with an electrode of a traditional structure, the electrode is simple, efficient and excellent in performance, the defects that a traditional catalyst is complex in preparation technological process and common in performance are effectively overcome, and the application prospect is wide. The problems that in the water oxidation process, OER has a high thermodynamic potential barrier, and high potential is needed to drive overall water decomposition are solved, and the method has great application value in the field of electrochemical catalysis.

The invention provides a strip-shaped high-entropy alloy self-supporting electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of nano materials and catalysts. The chemical formula of the strip-shaped high-entropy alloy self-supporting electrocatalyst is FeaCobNicCrdMMn, in the formula, a, b, c, d and e represent the atomic ratio, and a: b: c: d: e = (1-3): (1-3): (1-3): 1: 1. The overpotential of the catalyst provided by the invention can reach 273.2 mV under the current density of 10mA. Cm <-2 > in electrochemical alkaline hydrogen evolution catalysis; and in electrochemical alkaline oxygen evolution catalysis, the overpotential can reach 338.9 mV under the current density of 10mA. Cm <-2 >, and excellent electro-catalysis efficiency is achieved. And after a multi-section current density stability test for 600h, the potential attenuation is only 1.26%, and the stability is excellent.