A nitrogen-sulfur co-doped carbon material with electrocatalytic oxygen reduction activity and its preparation method

Abstract

The invention provides a nitrogen-sulfur co-doped carbon material with an electro-catalytic oxygen reduction activity and a preparation method of the carbon material, and belongs to the technical field of new material application. The technologic process comprises the following steps: performing ultrasonic cleaning on hairs with acetone, then shearing and crushing the hairs, pouring the hairs into a liner of a reaction kettle, adding analytically pure ammonia water, carrying out a hydrothermal degradation reaction, drying the solution obtained from hydrothermal degradation to obtain solid amino acid, mixing the solid amino acid with a template agent uniformly, thermally decomposing the mixture under an inert atmosphere, removing the template agent with diluted hydrochloric acid from the obtained sample, washing and drying, so as to prepare the nitrogen-sulfur co-doped carbon material. As the carbon material is prepared by taking hairs as the raw materials, the raw materials are simple and accessible, and low in cost; the selected template agent is low in cost and easy to remove; the preparation method is simple in technology; the prepared material is high in nitrogen and sulfur content, and has larger specific surface area, and is rich in pore structures; the nitrogen-sulfur co-doped carbon material prepared by the method shows up excellent properties in fuel cell cathode oxygen reduction and catalysis.

Description

technical field [0001] The invention relates to a method for preparing a nitrogen-sulfur co-doped carbon material with electrocatalytic oxygen reduction activity, belonging to the field of new materials. Background technique [0002] Heteroatom-doped carbon materials (including: single-doped, co-doped, and multi-doped) are currently very popular and important materials in the field of fuel cell cathode materials. Commonly used carbon carriers include carbon black, carbon nanotubes, graphite, graphite oxide, graphene, etc. These materials have one thing in common, they all have very rich π electrons, but these electrons cannot be directly used for oxygen reduction reactions, and heterogeneous The incorporation of atoms can change the electronegativity of the connected carbon atoms, which is beneficial to improve the oxygen reduction performance. Compared with commercial platinum carbon materials, this kind of materials has the advantages of cheap materials, good stability, a...

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Problems solved by technology

It not only avoids the loss of heteroelements in the pretreatment stage, but also does not use a strong alkaline template, which reduces the corrosion of the reaction vessel and quartz tube, and avoids the synthesis steps of the hard template. The removal of the template is simple and overcomes the Traditional synthesis of mesoporous carbon materials with hard templates has the disadvantages of time-consuming, laborious and multi-step

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