A kind of preparation method of high specific surface area iron nitrogen carbon catalyst

Abstract

The invention provides a method for preparing a high specific surface area iron-nitrogen-carbon catalyst. The iron source is weighed and dissolved in a carbon source and nitrogen source solution to form a solution; the obtained raw material solution is input into a vertical tube furnace through an electronic peristaltic pump, At the same time, the protective gas is introduced, and the raw material solution is gasified in the high temperature zone of the tube furnace and thermally decomposed to form nano-clusters; after thermal decomposition, the nano-clusters form nitrogen-doped carbon-coated iron nano-core-shell particles, which are collected at the end of the tube furnace The obtained nitrogen-doped carbon-coated iron nano-core-shell particles were placed in an aqueous regia solution, heated and stirred, filtered, and washed with deionized water; the obtained catalyst was dried, and then the catalyst was placed in a vacuum environment for heating , the catalyst is cooled with the furnace to obtain a high specific surface area iron-nitrogen-carbon catalyst. The iron-nitrogen-carbon catalyst of the invention has a simple synthesis method, readily available raw materials, easy operation, good product stability and high oxygen reduction catalytic activity, can be used as a fuel cell cathode catalyst, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and relates to a synthesis method of a fuel cell cathode oxygen reduction catalyst, in particular to a preparation method of a high specific surface area iron-nitrogen-carbon catalyst. Background technique [0002] Fuel cell (Fuel cell) has the advantages of high conversion efficiency and environmental protection. It is one of the most promising power generation technologies. However, the current commercialization still faces the problems of high cost and poor performance. The main reason that the actual energy conversion efficiency is lower than the theoretical value is the dynamic polarization and mass transfer polarization loss. Among them, the catalytic activity of the catalyst for the oxygen reduction reaction at the cathode is much lower than that of the oxidation reaction at the anode, even for the commercialized noble metal platinum catalyst. The low catalytic act...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a high specific surface area iron-nitrogen-carbon catalyst to solve the complex preparation process of the catalyst used in fuel cell cathode oxygen reduction in the prior art, and the initial oxygen reduction Technical problem with low potential