Ultrasonic synthesis of a helical nickel-iron supramolecular network framework nanocomposite and its application

Abstract

The invention belongs to the field of oxygen reduction electrocatalysis, and in particular relates to an ultrasonic synthesis method and application of a helical nickel-iron supramolecular network frame nanocomposite material, wherein the nanomaterial active material is C@NiFe 2 O 4 , showing a shape similar to a spiral, the ultrasonic synthesis method is simple, the cost is low, the reaction time is short, the synthesized composite material has high yield, uniform morphology, large specific surface area, and is easy to realize industrial production. The invention is used to solve the problems of low reversibility of the cathode oxygen reduction reaction, low exchange current density, high cost and toxicity of Pt-based catalytic materials in the existing fuel cell catalysts, and the obtained oxygen reduction catalyst has high potential, excellent The limiting current of , as well as the advantages of high stability and methanol tolerance, therefore, C@NiFe 2 O 4 It has great potential application value as an efficient electrocatalyst.

Description

technical field [0001] The invention belongs to the field of oxygen reduction electrocatalysis, and in particular relates to an ultrasonic synthesis method and application of a helical nickel-iron supramolecular network frame nanocomposite material. Background technique [0002] The current research on oxygen reduction electrocatalysts mostly focuses on compounds based on transition metals (Fe, Co, Ni, Mn) elements, mainly including oxides and their composites. Transition metals are often used to prepare electrocatalysts because of their diverse adsorption sites, unfilled orbitals and unpaired electrons, which can form empty d-electron orbitals for chemisorption bonds. Compared with single metal oxides, bimetallic oxides may have higher catalytic activity, and even show excellent catalytic activity in oxygen evolution and oxygen evolution reactions, which has attracted more and more attention of researchers. Among the supported transition metals, Co has high catalytic activ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing fuel cell catalysts. At present, fuel cell catalysts generally face the low reversibility of cathode oxygen reduction reaction, low exchange current density, often accompanied by high overpotential, and Pt-based catalytic materials. Defects such as high cost and toxicity; based on the unique structure of cellulose, a helical nickel-iron supramolecular network framework nanocomposite has been developed, which has high onset potential, half-slope potential, excellent limiting current and excellent stability and methanol tolerance

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