5results about How to "Lower valence" patented technology

The invention belongs to the technical field of catalysts, and discloses an iron-tantalum bimetal organic framework catalyst and a preparation method and application thereof. The iron-tantalum bimetal organic framework catalyst takes foamed nickel as a substrate, and a needle-shaped iron-tantalum bimetal organic framework material is uniformly loaded on the foamed nickel substrate. The preparation method comprises the following steps: carrying out acid etching on foamed nickel, then washing with ethanol and water in sequence, and drying; the preparation method comprises the following steps: uniformly dispersing water-soluble ferric salt and tantalum chloride in water to obtain a solution A; 2-hydroxyterephthalic acid is dissolved in a mixed solvent composed of absolute ethyl alcohol and N, N-dimethylformamide, and a solution B is obtained; dropwise adding the solution B into the solution A to obtain a solution C; obliquely placing foamed nickel into a hydrothermal reaction kettle, adding the solution C, completely soaking the foamed nickel, and reacting at 80-125 DEG C for 8-12 hours; and taking out the foamed nickel, washing with water, and drying to obtain the target catalyst. The catalyst prepared by the invention can realize low overpotential and excellent stability when being used for water electrolysis oxygen evolution reaction.

The application discloses a P2 type sodium electric layered oxide electrode material and a preparation method thereof, relates to the technical field of sodium ion batteries, and comprises the following steps: taking a sodium source, a nickel source, an iron source, a manganese source, a magnesium source and an aluminum source, mixing the sources, adding deionized water to jointly dissolve the sources through ultrasonic, stirring again, and obtaining a first solution; dissolving oxalic acid in deionized water to obtain a second solution; adding the second solution drop by drop into the first solution and stirring to obtain a third solution; heating and stirring the third solution; naturally cooling the third solution, taking out, filtering, and drying to obtain a precursor; calcining the precursor in an oxygen-free environment, naturally cooling the precursor, taking out, and grinding to obtain a raw material powder; and calcining the raw material powder in a high-temperature inert gas environment to obtain an electrode material. The preparation method can introduce oxygen vacancies by calcining in an oxygen-free environment, can embed more sodium ions, and can improve the specific capacity; and the electrode material has both capacity and cycle.

The application belongs to the field of hydrogen purification, and specifically discloses a hydrogen purification material and preparation and application thereof. The hydrogen purification material is a composite of silicon chrysocolla structure copper silicate and A-type molecular sieve, wherein the content of the silicon chrysocolla structure copper silicate is 30-70%, and the balance is A-type molecular sieve. The silicon chrysocolla structure copper silicate is prepared from a copper ammonia solution and a silica sol through co-precipitation, washing, drying and calcination, and then is compounded with A-type molecular sieve to be formed. The purification material can simultaneously remove trace amounts of CO, O2 and sulfur in high-purity hydrogen at 60-120 DEG C, and meets the requirements of the national standard GB / T37244-2018 for hydrogen used for fuel cell vehicles.

The application discloses an aluminum ion battery positive electrode material and a preparation method and application thereof. x Al y MnO2.nH2O, wherein, 0<=x<=0.3, 1 / 3<=y<2 / 3, 0<=n<=2, and x and n are not 0 at the same time; the preparation method comprises the following steps: mixing an aluminum salt solution and a precursor K z MnO2.mH2O, performing a heating reaction, and obtaining the aluminum ion positive electrode material through heat treatment of a reaction product. The aluminum ion battery positive electrode material has the advantages of high specific capacity, excellent cycle performance and rate performance, low cost, and the like, is beneficial to promoting commercial application of the aluminum ion battery, and has a very wide application prospect.

The application discloses a preparation method and application of a low-valence manganese-based anti-ozone aging agent. The preparation method is to use ascorbic acid as a main reducing agent to reduce the valence of Mn; and an intercalated manganese-based hydrotalcite is prepared by a coprecipitation method, and the interlayer guest molecules are further stabilized by being combined with Mn through coordination, so that the average valence of Mn is as low as 2.4. Experimental results show that the low-valence manganese-based anti-ozone aging agent has good ozone catalytic decomposition capacity, and can realize physical and chemical dual anti-ozone aging. The material obtained by compounding the low-valence manganese-based anti-ozone aging agent with rubber also has excellent anti-ozone aging performance.