3 results about "Nickel phosphate" patented technology

The application belongs to the technical field of water electrolysis hydrogen evolution in neutral solution, and provides a preparation method of copper@molybdenum modified nickel phosphate nanorod array. The material is a core-shell structure nanorod array obtained by depositing molybdenum modified nickel phosphate on copper nanowire. The nanorod array is prepared by combining the preparation processes of immersion method, electro-reduction method and electrodeposition method. The addition of molybdenum and the nanorod structure can effectively improve the conductivity of the catalyst, improve the electron transfer capacity, increase the number of exposed active sites of the catalyst, and promote the hydrogen evolution activity of the catalyst in the neutral solution. When the current density is 10 and 100 mA / cm 2 , the minimum overpotential required for water electrolysis hydrogen evolution is 35 and 195 mV, respectively, which is much lower than that of the hydrogen evolution electrocatalyst prepared by directly loading molybdenum modified nickel phosphate on the surface of the copper foam without molybdenum modification. At the same time, when the current density is -10 mA / cm 2 , the catalyst can be stably operated for at least 25 hours.

The present invention relates to a method for treating mechanical parts (2, 3) having a functional surface (8) made of NiP intended to be in frictional contact with another functional surface, the method comprising the step of oxidizing and / or phosphate-chloriding the functional surface (8) in order to artificially form an oxide layer (9) and / or a phosphate layer (10) on the functional surface (8), the phosphate layer (10) being a layer of nickel phosphate or zinc phosphate.

This invention discloses a high-voltage, high-rate lithium nickel manganese oxide cathode material and its preparation method, comprising the following steps: S1, weighing yttrium source, nickel source, and manganese source according to the stoichiometric ratio of Y:Ni:Mn, dissolving the three raw materials in water respectively, adding yttrium source aqueous solution, nickel source aqueous solution, and manganese source aqueous solution dropwise to citric acid aqueous solution, microwave-assisted heating to control the temperature of the solution at 60℃-80℃, stirring for a period of time, adding sodium bicarbonate aqueous solution and ammonia water to control the pH to 7-8, co-precipitating for a period of time, and then filtering, drying, and ball milling to obtain a preliminary yttrium-doped lithium nickel manganese oxide precursor; S2, mixing the precursor obtained in step S1 with a lithium source, and then calcining, annealing, and pulverizing to obtain a primary lithium nickel manganese oxide cathode material; S3, ball milling nickel phosphate and manganese phosphate into nanoparticles, uniformly coating the surface of the primary lithium nickel manganese oxide cathode material by spray drying, and then drying, calcining, annealing, pulverizing, sieving, and demagnetizing to obtain the lithium nickel manganese oxide cathode material.