A self-supporting m-n/c oxygen reduction catalyst and its preparation method and application

Abstract

The invention discloses a self-supporting M-N / C oxygen reduction catalyst and its preparation method and application. The method comprises: dissolving polyacrylonitrile and cellulose acetate in N,N-dimethylformamide solvent to form Spinning solution, electrospinning to obtain polyacrylonitrile / cellulose acetate composite fiber membrane, hydrolysis in caustic solution and amidoximation modification with hydroxylamine hydrochloride to obtain amidoximation polyacrylonitrile / regenerated Cellulose metal chelate fiber membrane; the amidoximated polyacrylonitrile / regenerated cellulose metal chelate fiber membrane is immersed in the metal ion solution for coordination adsorption; the obtained amidoximated polypropylene loaded with metal ions Nitrile / regenerated cellulose metal chelate fiber membrane was pyrolyzed to obtain a self-supporting M‑N / C oxygen reduction catalyst. The self-supporting M‑N / C oxygen reduction catalyst has abundant and uniformly dispersed oxygen reduction electrocatalytic sites exposed on the surface of the nitrogen-doped carbon fiber matrix, and exhibits excellent catalytic activity, durability and anti-poisoning ability.

Description

A kind of self-supporting M-N / C oxygen reduction catalyst and its preparation method and application technical field The invention belongs to the technical field of electrocatalysis energy, be specifically related to a kind of self-supporting M-N / C oxygen reduction catalyst and its Preparation method and application. Background technique [0002] Fuel cells and metal-air batteries have the advantages of high energy conversion efficiency, less environmental pollution, and small noise range. It has become a green and high-efficiency energy conversion device with great development prospects. The oxygen reduction reaction is the cathode of the above electrochemical device. The core electrochemical process is limited by its sluggish kinetics, and a large number of high-performance electrocatalysts must be used to improve the battery operation efficiency. At present, platinum-carbon catalysts are commonly used, but they have high loadings of precious metals, are expensive ...

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Problems solved by technology

[0005] However, metal-organic framework materials generally have a low carbon residue rate after high-temperature pyrolysis, and the obtained product has a large particle size, and the formed catalytic sites are easily buried in the carbon matrix and cannot be fully utilized; in addition, the Zn-based During the pyrolysis process of the zeolite imidazolate framework material, a large amount of metal zinc evaporates, causing certain pollution to the environment

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