Preparation method of cobalt electro-catalysis oxygen reduction material wrapping nitrogen-doped carbon nanotube

Abstract

The invention discloses a preparation method of a cobalt electro-catalysis oxygen reduction material wrapping a nitrogen-doped carbon nanotube. The method includes the following steps of making melamine, cobalt nitrate hexahydrate and glucose react to obtain a self-assembled melamine precursor, and baking the self-assembled melamine precursor to obtain a cobalt nanoparticle hybrid material electro-catalysis oxygen reduction agent wrapping the nitrogen-doped carbon nanotube. In preparation of the precursor, a self-assembled body can be formed through the electrostatic interaction and the hydrogen-bond interaction by means of nitrate radicals and melamine under the acid condition, cobalt ions are adsorbed into the self-assembled body, ordered arrangement and assembly of materials in the high-temperature baking process are facilitated by the pre-assembled precursor, and therefore more catalysis active sites are exposed, and the improvement of the performance of a catalyst is facilitated.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and in particular relates to a preparation method of nitrogen-doped carbon nanotube-wrapped cobalt electrocatalytic oxygen reduction material. Background technique [0002] Fuel cells convert chemical energy directly into electrical energy by electrochemically reducing oxygen and oxidizing fuel to produce water as the only by-product, which is an efficient and green power generation technology. The kinetically slow cathode oxygen reduction reaction is an important factor limiting the performance of proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC). Generally speaking, the oxygen reduction reaction performs energy conversion through two reaction pathways: (1) two-step two-electron transport pathway, the intermediate product is hydrogen peroxide; (2) four-electron transport pathway, water is the final reaction product, which This reaction pathway is mor...

AI Technical Summary

Problems solved by technology

However, in practical applications, since the traditional preparation of carbon-supported transition metal / nitrogen-doped materials is to obtain the final catalyst material by simply stirring and mixing the precursors, evaporating to dryness, and heat treatment, this simple mixing method cannot effectively obtain the precursors. As a result, its catalytic activity cannot be fully exerted; in addition, during the pyrolysis process, transition metal salts are easily pyrolyzed into transition metal oxides in various valence states, resulting in reduced catalytic activity and poor stability.

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