38results about How to "Excellent oxygen evolution catalytic performance" patented technology

The invention relates to a light composite electro-catalysis energy-saving anode for non-ferrous metal electro-deposition, which is composed of a metal substrate, an interlayer and a composite electro-catalysis superficial layer in sequence from inside to outside, wherein the metal substrate is Al or Al base alloy (Al-M1), the interlayer is a composite layer Al2O3-(Pb-M2) composed of Al2O3 or Pb base alloy, and the composite electro-catalysis superficial layer is a composite deposite (Pb-M2)-M3Ox composed of Pb or Pb base alloy and oxide catalyst or a composite deposite PbO2-M3Ox composed of PbO2 and oxide catalyst. The preparation method of the anode comprises the following steps: preparation of the metal substrate: carrying out anodic oxidation on the metal substrate surface and prefabricating a multihole Al2O3 layer; then performing an electro-deposition Pb or Pb base alloy layer on the multihole Al2O3 layer; and plating a (Pb-M2)-M3Ox or PbO2-M3Ox composite superficial layer on the surface of the Pb or Pb base alloy layer. The anode prepared by the invention can effectively reduce production energy consumption, improve cathode product quality, lower labor intensity, is suitable for industrialized production and can replace the Pb base alloy anode applied in the existing industry.

The invention relates to a preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material rich in cation vacancy. The preparation method includes the steps of (1) soaking Ni-Fe alloy matrix in electrolyte which contains, by weight, 1-3% of NaF, 4-7% of (NH4)2MoO4, 15-25% of H2O, 25-40% of glycerol and 25-55% of phosphoric acid; (2) subjecting the Ni-Fe alloy matrix soaked in the electrolyte to anodizing to obtain NiFeMo anodized film; (3) subjecting a sample treated in step (2) to alkaline liquid etching, washing, and drying to obtain the NiFe-LDH oxygen evolution electrocatalytic material. The NiFe-LDH oxygen evolution electrocatalytic material prepared herein has high catalytic activity and good electrochemical stability; the preparation method is simple, efficient and low in cost, is well popularizable and helps further promote the development and application of LDH catalysts.

The invention provides a high-performance non-noble metal oxygen evolution catalyst and a preparation method and application thereof. The high-performance non-noble metal oxygen evolution catalyst is core-shell structural nanoparticles of nickel borate-covered nickel boride, wherein a core layer is of nickel boride nanoparticles, and a shell layer is of nickel borate. A nickel salt is reduced in alkaline solution with a borohydride to obtain a precursor, and the precursor is thermally treated to obtain the non-noble metal oxygen evolution catalyst. Application of the non-noble metal oxygen evolution catalyst as anodic oxygen evolution reaction catalyst in water electrolysis equipment is also claimed in the invention. The catalyst prepared herein has excellent catalytic performance and is higher in oxygen evolution activity than other traditional non-noble metal catalysts from literature reports. The preparation method of the invention is simple, economic, convenient to perform, and easy for large-scale production, and has huge potential application value in various industrial catalyst or other fields of science.

Belonging to the technical field of electro-catalytic material synthesis, the invention discloses preparation and application of a heteroatom nitrogen surface modified MoS2 nano-material. The preparedcatalyst has excellent electrocatalytic oxygen evolution performance. The preparation process comprises the steps of: (1) carrying out ultrasonic treatment on carbon cloth (3*3cm) in acetone, ethanoland water respectively for 10min; (2) mixing ammonium molybdate and thiourea uniformly in proportion in water, carrying out high-temperature reaction with clean carbon cloth in a reaction kettle, then performing cooling to room temperature, washing the carbon cloth with ethanol and water in sequence, and performing drying; and (3) putting the MoS2 nanosheet obtained in step (2) and ammonia waterinto a reaction kettle, and carrying out high-temperature reaction for a certain period of time to obtain the heteroatom nitrogen modified MoS2 nano-material. The catalyst obtained by the invention shows excellent electrocatalytic performance, and the preparation process is simple and low in cost, and is suitable for large-scale production.

The invention discloses a preparation method of an MOF catalyst with gluconic acid enhanced catalytic activity and application of oxygen evolution in electrolysed water based on the catalyst and belongs to the technical field of nano catalysis, nano materials and metal organic framework materials. The preparation method comprises the main steps: blending a trimesic acid solution and a nickel nitrate solution under room temperature, adding a prepared gluconic acid solution, utilizing a mixed solution as electrolyte to be deposited on foamed nickel and activating to obtain a nickel gluconate-trimesic nickel composite catalyst, namely the MOF catalyst with the gluconic acid enhanced catalytic activity. The catalyst has the advantages of low preparation raw material cost, simple preparation technology, low reaction energy consumption and industrial application prospect. The catalyst can be applied to efficiently catalyzing oxygen evolution of electrolysed water and has good oxygen evolution electrocatalytic activity and electrochemical stability.

The invention discloses a method for preparing a bifunctional ternary metal hydroxynitride electrocatalyst by using waste lithium cobalt oxide, which comprises the steps of (1) pulverizing a waste lithium cobalt oxide positive electrode material, screening, grinding the undersize product into powder, soaking in diluted hydrochloric acid, and recording the supernatant as A; (2) adding a sodium hydroxide solution into the solution A until the pH value of the solution is 7 to obtain a solution B; (3) respectively adding a ferric nitrate solution and ethanol into the solution B to obtain a solution C; (4) putting foamed aluminum with the diameter of 1cm*1cm into the solution C, soaking the foamed aluminum on the surface of the solution C by taking the foamed aluminum as a working electrode and the solution C as a reaction solution, and performing plasma discharge on the foamed aluminum in a nitrogen atmosphere so as to generate chemical reaction on the surface; and (5) washing the self-supporting electrode, and carrying out vacuum drying to obtain the bifunctional ternary metal hydroxynitride electrocatalyst. The method is simple, the whole production process is simple, conditions are mild, the process is easy to control, cost is low, and the method is suitable for large-scale production.

The invention discloses a FeCoMoPB amorphous nanoparticle oxygen evolution catalyst and a preparation method thereof. The chemical formula of the oxygen evolution catalyst is (Fe50Co50)<100-x>MoxPB based on the mole percentage content of each atom, wherein x is equal to 1-10. The preparation method of the oxygen evolution catalyst comprises the following steps: mixing water-soluble ferrite, a cobalt salt, molybdate and sodium hypophosphite, adding deionized water, stirring until complete dissolution to obtain a reaction precursor solution, and then introducing protective gas to remove oxygen in the solution; preparing an aqueous solution of sodium borohydride; slowly dropwise adding the sodium borohydride solution into the precursor solution, fully reacting, and keeping intense stirring and continuously introducing protective gas in the dropwise adding and reacting process; and carrying out suction filtration on the reacted solution, cleaning the obtained precipitate, and carrying out vacuum drying to obtain the FeCoMoPB amorphous nanoparticles with a core-shell structure. Through micro doping of the Mo element and the synergistic effect of multiple elements, the oxygen evolution catalytic performance, structural stability and durability of the Fe-Co-P-B amorphous nano-particle are greatly improved.

The invention discloses a method for preparing oxygen precipitation electrode based on three-dimensional porous grapheme. The method includes the following steps: 1) oxidizing graphite powder to prepare a graphite oxide; 2) carrying out vacuum drying on the graphite oxide prepared in step 1) at 60-80 DEG C; 3) carrying out heat treatment on the dried graphite oxide prepared in step 2) in vacuum at 80-120 DEG C for 8-24 hours; 4) heating the graphite oxide in step 3) in vacuum to 180-250 DEG C in vacuum and keeping for 5-60 minutes. The oxygen precipitation electrode based on three-dimensional porous grapheme prepared by the method disclosed by the invention has excellent catalytic performance of oxygen precipitation and good long term stability, can be used for replacing costly iridium and an oxide electrode thereof, is widely applied in fields such as photocatalytic water splitting and metal-air battery as well as other energy source converting devices, and has a high practical value, and the raw material of the oxygen precipitation electrode disclosed by the invention is common graphite powder, so that the oxygen precipitation electrode is wide in raw material source, low in cost, simple in preparation method and suitable for mass production.

The invention relates to a modification and optimization method of an iridium dioxide catalyst, in particular to a modification and optimization method of a membrane electrode assembly anode catalyst in a pure water electrolysis hydrogen production technology, and belongs to the field of preparation of noble metal catalyst materials. The method comprises the steps of heating an iridium dioxide catalyst to 600-900 DEG C in an oxygen atmosphere at a heating rate of 2-10 DEG C/min, carrying out heat treatment for 2-5 hours, and after the heat treatment is finished, cooling to obtain the modified and optimized iridium dioxide catalyst, wherein the atmosphere with the oxygen does not contain gas capable of reacting with the oxygen. According to the method, the performance and the structure of the existing iridium dioxide catalyst are optimized through heat treatment, so that the iridium dioxide catalyst has good oxygen evolution catalytic activity and stability.

The invention discloses a preparation method of a coating for a difunctional catalyst applied to electrolysis of water. The preparation method comprises the following steps: with graphite, Ni, Fe, Cu and other metals and netted metals thereof as a conductive substrate, sequentially carrying out acid pickling, alcohol washing, water washing, drying and other pretreatment on the conductive substrate for later use; with an acidic aqueous solution containing phosphomolybdic acid, nickel nitrate, sodium citrate and boric acid as an electroplating solution, conducting cathode plating on a substrate electrode at a normal temperature by adopting a constant current method, wherein current density is 30-75 mA/cm<2>, and plating time is 30-60 min; and with an aqueous ferric nitrate solution as an electroplating solution,conducting secondary cathode plating on the substrate at a normal temperature by adopting a constant potential method, wherein a potential ranges from -1.0 V to -1.5 V, and plating time ranges from 60 min to 120 min. The Ni-Mo-Fe-O-B-P compound high-efficiency catalyst coating prepared by the method has the functions of catalyzing hydrogen evolution and oxygen evolution at the same time, the preparation process of the catalyst is simplified, material and preparation cost is reduced, and the stability of long-time operation of the electrode is improved.