Preparation method for carbon/metal oxide nanofiber composite catalyst

Abstract

The invention relates to a preparation method for a carbon / metal oxide nanofiber composite catalyst. The preparation method comprises the following steps of (a), dissolving a metal ion-containing salt solution and a high-molecular polymer into an organic solvent, and stirring to form a spinning precursor mixed solution, wherein the metal ion concentration is weighed based on a stoichiometric ratio; (b), performing electrostatic spinning on the spinning precursor mixed solution to form a composite non-woven material; and (c), putting the composite non-woven material into an inert atmosphere to be subjected to high-temperature calcining to obtain the carbon / metal oxide nanofiber composite catalyst. The carbon / metal oxide nanofiber composite catalyst has high electrical conductivity, reinforced oxygen reduction electro-catalytic property and excellent oxygen evolution performance, and is a dual-functional catalyst with efficient catalytic property.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of a catalyst, in particular to a preparation method of a carbon / metal oxide nanofiber composite catalyst. Background technique [0002] Due to the energy crisis and the severe environmental pollution caused by the extensive use of traditional fuels, the research and development of clean, efficient and sustainable new energy sources has attracted more and more attention and interest. Among them, metal-air batteries, especially lithium-air batteries with ultra-high theoretical specific capacity, have been developed rapidly in recent years, but due to the slow kinetics of cathode oxygen reduction (ORR) and oxygen evolution reaction (OER) in the reaction process, As a result, metal-air batteries have problems such as high charge-discharge overpotential, low cycle efficiency, poor rate performance, and short cycle life, which limit their wide practical applicatio...

AI Technical Summary

Problems solved by technology

Noble metals (such as Pt) have excellent catalytic performance and high catalytic activity, but they are expensive and costly, which limits their promotion and application; carbon material catalysts are low in cost and have a wide range of sources, but most carbon materials are only for oxygen reduction ( ORR) is effective, but not effective for oxygen evolution (OER). In addition, in the long-term cycle process, the stability of carbon materials is poor; the metal oxide catalyst is a dual-functional catalyst, which is effective for both ORR and OER, and its The price is cheap, the source is wide, the synthesis method is simple, it is very suitable for practical application, but its conductivity is generally not good

Images