Preparation method of foamed nickel electrode modified with hydrophilic monodisperse magnetic NiFe@NiFeO nanoparticles

Abstract

The invention provides a preparation method of a foamed nickel electrode modified with hydrophilic monodisperse magnetic NiFe@NiFeO nanoparticles. Reduction nucleation mode is adopted; preparation ofmonodisperse magnetic Ni<x>Fe<1-x>@Ni<x>Fe<1-x>O with the particle size of 4-5nm is realized, then the monodisperse magnetic Ni<x>Fe<1-x>@Ni<x>Fe<1-x>O is uniformly coated on foamed nickel, and in anaqueous solution, the monodisperse magnetic nanoparticles and the magnetic foamed nickel are magnetically interacted, so that no extra adhesive is needed in loading on foamed nickel. The catalyst hasexcellent electrocatalytic oxygen evolution activity under an alkaline condition; the current density of 10mA*cm<-2> can be achieved only at the overpotential of 215 mV under the 1M KOH alkaline condition, the electrocatalytic activity under the large current has more advantageous, and the current density of 100 mA*cm<-2> can be achieved at the overpotential of 260 mV. The method is simple, can avoid the defect that the powder catalyst can be stably loaded on a conductive substrate only by introducing an adhesive, high activity and stability are achieved at the same time, and the application prospect in the aspect of electrolyzing water is promising.

Description

technical field [0001] The invention belongs to a new preparation method of electrolyzed water anode materials in the field of renewable energy power generation, and relates to a universal synthesis method of hydrophilic monodisperse magnetic nanomaterials and its use in the construction of electrolyzed water anode materials used without binders The preparation method is specifically used in a high-efficiency electrocatalytic water electrolysis hydrogen production system. Background technique [0002] As a good conductive material with a three-dimensional structure, nickel foam is often used as the base of electrolytic water electrodes to construct high-efficiency electrolytic water electrodes. Such electrodes usually include the following two types: one is to use high-cost special binders in foam The powder catalyst is loaded on nickel, and the other is to grow the catalyst on the conductive material by the method of in-situ growth. The method of using a special binder wil...

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Problems solved by technology

The method of using a special binder will greatly increase the cost of electrocatalytic electrode materials, and it is difficult to obtain good economic advantages; and the current methods of in-situ growth to construct electrode materials, including hydrothermal synthesis, electrodeposition synthesis, etc., such technologies are still in the advanced stage. In the stage of laboratory research and development, it is difficult to realize industrial production

On the other hand, although the synthesis of monodisperse magnetic nanomaterials has been realized for a long time, due to the harsh synthesis conditions and complicated preparation process of monodisperse magnetic nanomaterials, it is difficult to realize the large-scale preparation and industrial application of monodisperse magnetic nanomaterials with excellent performance.

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